阅读说明：本技术 信号模拟装置、方法和发动机振动监视系统、测试方法 (Signal simulation device and method, engine vibration monitoring system and test method ) 是由 李栋 陶金伟 张树彦 于 2020-05-25 设计创作，主要内容包括：本公开提出一种信号模拟装置、方法和发动机振动监视系统、测试方法,涉及航空发动机技术领域。本公开的一种信号模拟装置,包括：数据获取模块,被配置为获取目标参数和原始波形数据；波形调节模块,被配置为调节原始波形数据,获取第一波形数据；数模转换模块,被配置为将第一波形数据转换为模拟信号,获取第二波形数据；同步控制模块,被配置为控制数模转换模块同时处理振动和转速波形数据；电荷转换模块,被配置为将第二振动波形数据转换为电荷信号形式的第三振动波形数据；输出模块,被配置为输出第二转速波形数据和第三振动波形数据。这样的装置能够通过模拟的方式生成机振动监视系统的测试数据,从而提高灵活度和测试的全面性。(The disclosure provides a signal simulation device and method, an engine vibration monitoring system and a test method, and relates to the technical field of aircraft engines. The disclosed signal simulation apparatus includes: a data acquisition module configured to acquire target parameters and raw waveform data; the waveform adjusting module is configured to adjust original waveform data to obtain first waveform data; the digital-to-analog conversion module is configured to convert the first waveform data into an analog signal and acquire second waveform data; a synchronous control module configured to control the digital-to-analog conversion module to process the vibration and rotation speed waveform data at the same time; a charge conversion module configured to convert the second vibration waveform data into third vibration waveform data in the form of a charge signal; and the output module is configured to output the second rotating speed waveform data and the third vibration waveform data. The device can generate the test data of the machine vibration monitoring system in a simulation mode, thereby improving the flexibility and the test comprehensiveness.)

1. A signal simulation apparatus, comprising:

the data acquisition module is configured to acquire target parameters and original waveform data, wherein the target parameters comprise a target amplitude value, a target phase angle and a target rotating speed, and the original waveform data comprise vibration original waveform data and rotating speed original waveform data;

a waveform adjusting module configured to adjust the original waveform data according to the target amplitude and the target phase angle from the data obtaining module, and obtain first waveform data, wherein the first waveform data comprises first vibration waveform data and first rotating speed waveform data;

a digital-to-analog conversion module configured to receive the first waveform from the waveform adjustment module, convert the first waveform data into an analog signal according to the target rotation speed, and obtain second waveform data, wherein the second waveform data includes second vibration waveform data and second rotation speed waveform data;

a synchronous control module configured to control the digital-to-analog conversion module to simultaneously perform conversion of the first vibration waveform data into second vibration waveform data and conversion of the first rotation speed waveform data into second rotation speed waveform data;

a charge conversion module configured to convert the second vibration waveform data into third vibration waveform data in the form of a charge signal;

an output module configured to output the second rotational speed waveform data and the third vibration waveform data as test data of an engine vibration monitoring system.

2. The apparatus of claim 1, further comprising:

a low pass filtering module configured to receive the second waveform data from the digital-to-analog conversion module, eliminate harmonic signals having a frequency higher than a predetermined frequency by low pass filtering, send the filtered second vibration waveform data to the charge conversion module, and send the filtered second rotation speed waveform data to the output module.

3. The apparatus of claim 1, wherein the data acquisition module is configured to: extracting the raw waveform data from a memory; and acquiring the target parameters from an upper computer or input through a control surface.

4. The apparatus of claim 1, wherein the waveform adjustment module comprises:

an amplitude control unit configured to adjust an amplitude of the original waveform data according to the target amplitude;

and the phase angle control unit is configured to extract the phase difference of the vibration waveform data and the rotating speed waveform data from the first waveform data after the amplitude is adjusted according to the target phase angle, and acquire the first waveform data.

5. The apparatus of claim 1, wherein the charge conversion module comprises a series capacitance to convert a waveform signal in the form of a voltage to a charge signal.

6. The apparatus of claim 1, wherein:

the waveform adjusting module comprises a vibration waveform adjusting module and a rotating speed waveform adjusting module, the vibration waveform adjusting module generates the first vibration waveform data according to the original vibration waveform data, and the rotating speed waveform adjusting module generates the first rotating speed waveform data according to the original rotating speed waveform data;

the digital-to-analog conversion module comprises a vibration waveform digital-to-analog conversion module and a rotating speed waveform digital-to-analog conversion module, the vibration waveform digital-to-analog conversion module is connected with the vibration waveform adjusting module, and the rotating speed waveform digital-to-analog conversion module is connected with the rotating speed waveform adjusting module;

the synchronous control module is configured to control the vibration waveform digital-to-analog conversion module and the rotation speed waveform data conversion module to synchronously execute digital-to-analog conversion.

7. The apparatus of any of claims 1-6, further comprising:

a controller configured to input a target parameter to the data acquisition module, wherein a mode of inputting the target parameter includes at least one of a single test, a continuous test, a charge collection precision test, a phase angle collection stability test, or a rotational speed collection precision test.

8. An engine vibration monitoring system comprising:

the signal simulation device of any one of claims 1 to 7; and

an engine vibration monitoring device configured to perform a performance test based on the vibration waveform data and the rotational speed waveform data from the signal simulation device.

9. A method of signal simulation, comprising:

acquiring target parameters and original waveform data, wherein the target parameters comprise a target amplitude, a target phase angle and a target rotating speed, and the original waveform data comprise vibration original waveform data and rotating speed original waveform data;

adjusting the original waveform data according to the target amplitude and the target phase angle to obtain first waveform data, wherein the first waveform data comprises first vibration waveform data and first rotating speed waveform data;

synchronously converting the first vibration waveform data and the first rotating speed waveform data into analog signals according to the target rotating speed to obtain second waveform data, wherein the second waveform data comprises second vibration waveform data and second rotating speed waveform data;

converting the second vibration waveform data into third vibration waveform data in the form of an electric charge signal;

and outputting the second rotating speed waveform data and the third vibration waveform data to serve as test data of an engine vibration monitoring system.

10. The method of claim 9, further comprising:

eliminating harmonic signals of which the frequency is higher than a predetermined frequency in the second waveform data by low-pass filtering;

the third vibration waveform data obtained by converting the second vibration waveform data into an electric charge signal form is third vibration waveform data obtained by converting the filtered second vibration waveform data into an electric charge signal form;

and outputting the second rotating speed waveform data is outputting the filtered second rotating speed waveform data.

11. The method of claim 9, wherein said acquiring target parameters and raw waveform data comprises: extracting the raw waveform data from a memory; and acquiring the target parameters from an upper computer or input through a control surface.

12. The method of claim 9, wherein said adjusting said raw waveform data according to said target amplitude, target phase angle, obtaining first waveform data comprises:

adjusting the amplitude of the original waveform data according to the target amplitude;

and extracting the phase difference of the vibration waveform data and the rotating speed waveform data from the first waveform data after the amplitude is adjusted according to the target phase angle, and acquiring the first waveform data.

13. The method of claim 9, wherein said converting the second vibration waveform data into third vibration waveform data in the form of an electrical charge signal comprises: the second vibration waveform data in the form of a voltage is converted into third vibration waveform data in the form of a charge signal through the series capacitance.

14. The method of any of claims 9 to 13, further comprising:

and inputting target parameters to the data acquisition module, wherein the mode of inputting the target parameters comprises at least one of single test, continuous test, charge acquisition precision test, phase angle acquisition stability test or rotating speed acquisition precision test.

15. A method of testing an engine vibration monitoring device, comprising:

a signal simulation method according to any one of claims 8 to 14; and

and inputting the generated vibration waveform data and the rotating speed waveform data into an engine vibration monitoring system, and performing a performance test on the engine vibration monitoring system.

Technical Field

The disclosure relates to the technical field of aircraft engines, in particular to a signal simulation device and method, an engine vibration monitoring system and an engine vibration testing method.

Background

The fan unbalance is a common problem in the development and operation process of the turbofan aircraft engine, the size of the unbalance directly affects the vibration level of a fan rotor, and if the vibration exceeds the limit, the safety of the engine is affected. Therefore, it is necessary to trim the fan of a turbofan aircraft engine to ensure that the vibration level of the fan rotor is within limits.

In the related technology, an aircraft Engine adopts an Engine Vibration Monitoring device such as an EVM (Engine Vibration Monitoring) device or an EMU (Engine Monitoring Unit) to Monitor the Engine Vibration conditions at different rotating speeds in real time in the flight process, a built-in algorithm is adopted to analyze the fundamental frequency Vibration amplitude and phase of a fan rotor, and then an algorithm such as an influence coefficient method is adopted to give a suggested trim calculation result.

The aeroengine mainly adopts a piezoelectric acceleration sensor and a magnetoelectric rotating speed sensor to respectively measure the vibration and the rotating speed of the engine, wherein a low tooth/high tooth signal measured by the rotating speed sensor of the fan rotor can be used for marking the phase of the fan rotor.

Disclosure of Invention

The inventor finds that the test process of the engine vibration monitoring device in the related art often needs a test device such as a rotor test bed, and the test flexibility and efficiency are limited.

It is an object of the present disclosure to improve the flexibility of testing engine vibration monitoring devices.

According to an aspect of some embodiments of the present disclosure, there is provided a signal simulation apparatus including: the data acquisition module is configured to acquire target parameters and original waveform data, wherein the target parameters comprise a target amplitude value, a target phase angle and a target rotating speed, and the original waveform data comprise vibration original waveform data and rotating speed original waveform data; the waveform adjusting module is configured to adjust the original waveform data according to the target amplitude and the target phase angle from the data acquiring module to acquire first waveform data, wherein the first waveform data comprises first vibration waveform data and first rotating speed waveform data; the digital-to-analog conversion module is configured to receive the first waveform from the waveform adjusting module, convert the first waveform data into an analog signal according to the target rotating speed and acquire second waveform data, wherein the second waveform data comprises second vibration waveform data and second rotating speed waveform data; a synchronous control module configured to control the digital-to-analog conversion module to simultaneously perform conversion of the first vibration waveform data into second vibration waveform data and conversion of the first tachometer waveform data into second tachometer waveform data; a charge conversion module configured to convert the second vibration waveform data into third vibration waveform data in the form of a charge signal; and an output module configured to output the second rotational speed waveform data and the third vibration waveform data as test data of the engine vibration monitoring device.

In some embodiments, the signal simulation apparatus further comprises: and the low-pass filtering module is configured to receive the second waveform data from the digital-to-analog conversion module, eliminate harmonic signals with the frequency higher than the preset frequency through low-pass filtering, send the filtered second vibration waveform data to the charge conversion module, and send the filtered second rotating speed waveform data to the output module.

In some embodiments, the data acquisition module is configured to: extracting raw waveform data from a memory; and acquiring target parameters from an upper computer or input through a control surface.

In some embodiments, the waveform adjustment module comprises: an amplitude control unit configured to adjust an amplitude of the original waveform data according to a target amplitude; and the phase angle control unit is configured to extract the phase difference of the vibration waveform data and the rotating speed waveform data from the first waveform data after the amplitude is adjusted according to the target phase angle, and acquire the first waveform data.

In some embodiments, the charge conversion module includes a series capacitance that converts the waveform signal in the form of a voltage into a charge signal.

In some embodiments, the waveform adjustment module includes a vibration waveform adjustment module and a rotational speed waveform adjustment module, the vibration waveform adjustment module generates first vibration waveform data according to the original vibration waveform data, the rotational speed waveform adjustment module generates first rotational speed waveform data according to the original rotational speed waveform data; the digital-to-analog conversion module comprises a vibration waveform digital-to-analog conversion module and a rotating speed waveform digital-to-analog conversion module, the vibration waveform digital-to-analog conversion module is connected with the vibration waveform adjusting module, and the rotating speed waveform digital-to-analog conversion module is connected with the rotating speed waveform adjusting module; the synchronous control module is configured to control the vibration waveform digital-to-analog conversion module and the rotating speed waveform data conversion module to synchronously execute digital-to-analog conversion.

In some embodiments, the signal simulation apparatus further comprises: a controller configured to input a target parameter to the data acquisition module, wherein a mode of inputting the target parameter includes at least one of a single test, a continuous test, a charge collection precision test, a phase angle collection stability test, or a rotational speed collection precision test.

The device can generate vibration waveform and rotation speed waveform signals in a simulation mode, and the vibration waveform and the rotation speed waveform signals serve as a test basis for the transmitter vibration monitoring system, so that the flexibility can be improved in the aspects of site occupation and test parameter configuration, and the comprehensiveness of test parameters can also be improved.

According to an aspect of some embodiments of the present disclosure, there is provided an engine vibration monitoring system, including: any one of the signal simulation means mentioned hereinbefore; and an engine vibration monitoring device configured to perform a performance test based on the vibration waveform data and the rotational speed waveform data from the signal simulation device.

The system can utilize the vibration waveform and the rotating speed waveform signal generated in a simulation mode as a test basis for the transmitter vibration monitoring system, thereby improving the flexibility in the aspects of site occupation and test parameter configuration and improving the comprehensiveness of the test.

According to an aspect of some embodiments of the present disclosure, there is provided a signal simulation method, including: acquiring target parameters and original waveform data, wherein the target parameters comprise a target amplitude, a target phase angle and a target rotating speed, and the original waveform data comprise vibration original waveform data and rotating speed original waveform data; adjusting original waveform data according to the target amplitude and the target phase angle to obtain first waveform data, wherein the first waveform data comprises first vibration waveform data and first rotating speed waveform data; synchronously converting the first vibration waveform data and the first rotating speed waveform data into analog signals according to the target rotating speed to obtain second waveform data, wherein the second waveform data comprises second vibration waveform data and second rotating speed waveform data; converting the second vibration waveform data into third vibration waveform data in the form of an electric charge signal; the second rotational speed waveform data and the third vibration waveform data are output as test data of the engine vibration monitoring device.

In some embodiments, the signal simulation method further comprises: eliminating harmonic signals of which the frequency is higher than a predetermined frequency in the second waveform data by low-pass filtering; converting the second vibration waveform data into third vibration waveform data in the form of an electric charge signal, wherein the third vibration waveform data is the third vibration waveform data which is obtained by converting the filtered second vibration waveform data into the form of the electric charge signal; and outputting the second rotating speed waveform data as the second rotating speed waveform data after filtering.

In some embodiments, acquiring the target parameter and the raw waveform data comprises: extracting raw waveform data from a memory; and acquiring target parameters from the upper computer or input through the control surface.

In some embodiments, adjusting the raw waveform data according to the target amplitude, the target phase angle, and obtaining the first waveform data comprises: adjusting the amplitude of the original waveform data according to the target amplitude; and extracting the phase difference of the vibration waveform data and the rotating speed waveform data from the first waveform data after the amplitude is adjusted according to the target phase angle, and acquiring the first waveform data.

In some embodiments, converting the second vibration waveform data into third vibration waveform data in the form of an electric charge signal includes: the second vibration waveform data in the form of a voltage is converted into third vibration waveform data in the form of a charge signal through the series capacitance.

In some embodiments, the signal simulation method further comprises: and inputting target parameters to the data acquisition module, wherein the mode of inputting the target parameters comprises at least one of single test, continuous test, charge acquisition precision test, phase angle acquisition stability test or rotating speed acquisition precision test.

By the method, the vibration waveform and the rotating speed waveform signal can be generated in a simulation mode and used as a test basis for the transmitter vibration monitoring system, so that the flexibility can be improved in the aspects of site occupation and test parameter configuration without adopting a rotor table or an engine for testing, and the comprehensiveness of the test can also be improved.

According to an aspect of some embodiments of the present disclosure, there is provided a method of testing an engine vibration monitoring apparatus, including: any one of the signal simulation methods mentioned hereinabove; and inputting the generated vibration waveform data and the rotational speed waveform data to an engine vibration monitoring device, and performing a performance test on the engine vibration monitoring device.

By the method, the vibration waveform and the rotating speed waveform signal generated in a simulation mode can be used as a test basis for the transmitter vibration monitoring system, so that the flexibility can be improved in the aspects of site occupation and test parameter configuration without adopting a rotor table or an engine for testing, and the comprehensiveness of the test can also be improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a vibration monitoring system of the engine of FIG. 1 according to the related art.

Fig. 2 is a schematic diagram of vibration waveform data and rotational speed waveform data.

Fig. 3A is a schematic diagram of some embodiments of a signal simulation apparatus of the present disclosure.

Fig. 3B is a schematic diagram of some embodiments of a waveform adjustment module in a signal simulation apparatus of the present disclosure.

Fig. 3C is a schematic diagram of some embodiments of the waveform adjusting module and the digital-to-analog converting module in the signal simulation apparatus of the present disclosure.

Fig. 4 is a logic diagram illustrating the operation of some embodiments of the signal simulation apparatus of the present disclosure.

Fig. 5 is a schematic diagram of further embodiments of a signal simulation apparatus according to the present disclosure.

FIG. 6 is a schematic diagram of some embodiments of an engine vibration monitoring system of the present disclosure.

Fig. 7 is a flow chart of some embodiments of a signal simulation method of the present disclosure.

FIG. 8 is a flow chart of some embodiments of a testing method of an engine vibration monitoring device of the present disclosure.

Detailed Description

The technical solution of the present disclosure is further described in detail by the accompanying drawings and examples.

An engine vibration monitoring system in the related art may mainly include an acceleration sensor, a rotation speed sensor, a vibration monitoring device, and the like, as shown in fig. 1.

The acceleration sensor is generally installed at the casing or the bearing, and converts the vibration acceleration at the measured position into an electric charge signal to be output, as shown in fig. 2. The magnetoelectric speed sensor outputs an alternating voltage waveform proportional to the rotor speed (related to the number of the tone wheel teeth) by the influence of the tone wheel teeth on the magnetic resistance of the rotor, as shown in fig. 2. To mark the absolute position of the fan, the teeth of the tone wheel are provided with a high/low tooth (hereinafter, a high tooth is taken as an example), and when the high tooth passes through the rotation speed sensor, the voltage output by the rotation speed sensor has a higher amplitude than the voltage output by other tone wheel teeth. The engine vibration monitoring device collects the acceleration signal and the rotating speed signal after signal conditioning at the trim rotating speed, and the built-in algorithm can calculate the vibration amplitude of the fundamental frequency (same frequency with the fan rotor) and the phase difference between the fundamental frequency and the high teeth, so that the unbalance is obtained. Through algorithms such as an influence coefficient method and the like, a trim suggestion (such as the weight, the position and the like of the mass block needing to be increased or decreased) can be given.

In the development and test process of the engine vibration monitoring devices such as the EVM or the EMU, the performance of the engine vibration monitoring devices such as the EVM or the EMU is tested and verified by the testing devices such as the rotor test bed, the flexibility is low, the cost is high, and the accurate measurement and adjustment of the phase between the charge signal output by the piezoelectric acceleration sensor and the high-tooth/low-tooth signal of the rotating speed sensor are difficult.

A schematic diagram of some embodiments of the signal simulation apparatus of the present disclosure is shown in fig. 3.

The data acquisition module 301 is capable of acquiring target parameters and raw waveform data. The target parameters comprise a target amplitude, a target phase angle and a target rotating speed, and the original waveform data comprises vibration original waveform data and rotating speed original waveform data. In some embodiments, the data acquisition module 301 may extract raw waveform data from a memory, may acquire target parameters from an upper computer or input through a control surface.

In some embodiments, a tester can set required target parameters according to requirements and arbitrarily set the vibration amplitude, the phase between the vibration signal and the rotation speed, so that the problems that the vibration value of the existing rotor table or engine is not flexible to adjust through a mass block, the phase is not flexible to adjust through the mass block, and the rotation speed is not flexible to adjust are solved, and the flexibility of test data is improved. In some embodiments, the sensor waveform data can be arbitrarily set to be low teeth or high teeth so as to adapt to the test of different tone wheel types and expand the application range of the signal simulation device.

The waveform adjusting module 302 is capable of adjusting the original waveform data according to the target amplitude and the target phase angle from the data obtaining module to obtain first waveform data, wherein the first waveform data includes first vibration waveform data and first rotational speed waveform data. In some embodiments, as shown in fig. 3B, the waveform adjustment module may include a magnitude control unit 312 and a phase angle control unit 322. The amplitude control unit 312 can adjust the amplitude of the original waveform data according to the target amplitude; the phase angle control unit 322 can determine the phase difference between the vibration waveform data and the rotation speed waveform data extracted from the amplitude-adjusted first waveform data according to the target phase angle, and acquire the second waveform data.

The digital-to-analog conversion module 303 is capable of receiving the first waveform from the waveform adjustment module, converting the first waveform data into an analog signal according to the target rotation speed, and acquiring second waveform data, where the second waveform data includes second vibration waveform data and second rotation speed waveform data.

The synchronization control module 304 can control the digital-to-analog conversion module to simultaneously execute: the first vibration waveform data is converted into second vibration waveform data, and the first rotational speed waveform data is converted into second rotational speed waveform data.

The charge conversion module 305 is capable of converting the second vibration waveform data into third vibration waveform data in the form of a charge signal. In some embodiments, the charge conversion module includes a series capacitance that converts the waveform signal in the form of a voltage into a charge signal.

The output module 306 is capable of outputting the second rotational speed waveform data and the third vibration waveform data as test data of the engine vibration monitoring device.

The device can generate the vibration waveform and the rotating speed waveform signal in a simulation mode to be used as a test basis for the transmitter vibration monitoring system, thereby not only adopting a rotor table or an engine to carry out the test, but also improving the flexibility in the aspects of site occupation and test parameter configuration and improving the comprehensiveness of the test.

In some embodiments, as shown in fig. 3, the signal simulation apparatus may further include a low-pass filtering module 307, which is capable of receiving the second waveform data from the digital-to-analog conversion module, eliminating harmonic signals with a frequency higher than a predetermined frequency through low-pass filtering, sending the filtered second vibration waveform data to the charge conversion module, and sending the filtered second rotation speed waveform data to the output module.

The device can filter out high-frequency harmonic signals generated after digital-to-analog conversion, improves the accuracy of the generated output signals for testing, improves the reliability of testing, and increases the testing driving capacity.

In some embodiments, as shown in fig. 3C, the waveform adjustment module 302 may include a vibration waveform adjustment module 332 and a tachometer waveform adjustment module 343, the vibration waveform adjustment module 332 generating first vibration waveform data from the raw vibration waveform data, the tachometer waveform adjustment module 342 generating first tachometer waveform data from the raw tachometer waveform data. In some embodiments, the vibration waveform adjustment module 332 and the rotational speed waveform adjustment module 343 include a magnitude control unit 312 and a phase angle control unit 322, respectively. The digital-to-analog conversion module 303 includes a vibration waveform digital-to-analog conversion module 313 and a rotation speed waveform digital-to-analog conversion module 323, the vibration waveform digital-to-analog conversion module 313 is connected with the vibration waveform adjusting module 332, and the rotation speed waveform digital-to-analog conversion module 323 is connected with the rotation speed waveform adjusting module 322. The synchronization control module 304 can control the vibration waveform digital-to-analog conversion module 312 and the rotation speed waveform data conversion module 322 to synchronously perform digital-to-analog conversion.

The device can process vibration waveform data and rotating speed waveform data through different modules respectively, reduce the requirement on the processing capacity of a single module and avoid mutual influence; the waveform data processed by different modules are synchronized through the synchronous control module, so that the synchronization of test data is ensured.

In some embodiments, the memory may store actual vibration and rotation speed waveform data of the engine or the rotor table generated according to actual tests, which is extracted by the data acquisition module 301, so as to support development and testing of a fan rotor balancing algorithm, and improve reliability and authenticity of test data.

In some embodiments, the signal simulation apparatus may further include a controller 308, such as an upper computer or a microprocessor, which enables a user to set a test mode, for example, set corresponding parameters such as a single test, a continuous test, a charge collection precision test, a phase angle collection stability test, and a rotation speed collection precision test, so as to implement a programming and an automatic test.

A schematic diagram of the operating logic of some embodiments of the signal simulation apparatus of the present disclosure is shown in fig. 4.

In 401, the set vibration and speed signal amplitude, phase angle, engine speed and other parameter information are obtained, in 411, the stored vibration original waveform data are obtained, and in 421, the speed original waveform data are obtained.

Amplitude control is performed on the vibration original waveform data and the rotation speed original waveform data according to the parameter information acquired in 401 in 412 and 422 respectively, and phase angle control is performed on the vibration original waveform data and the rotation speed original waveform data according to the parameter information acquired in 401 in 413 and 423 respectively.

According to the set phase angle, the waveform is respectively taken from the newly generated waveform data according to a certain phase difference, and the vibration waveform data and the rotating speed are respectively output to the digital-to-analog converter 414 and the digital-to-analog converter 424, so as to achieve the purpose of phase angle control. The synchronization control 402 calculates the interval time of the analog-to-digital conversion according to the set rotation speed, and then controls the two mode conversion modules to simultaneously convert the waveform data into analog signals.

Low pass filters 415 and 425 filter each of the digital-to-analog converted output signals to remove high frequency harmonic signals from the digital-to-analog converted output.

At 416, the vibration waveform signal in the form of a voltage is converted into an electric charge signal by means of a series capacitor to simulate the signal output characteristics of the piezoelectric acceleration sensor.

Based on the operation logic, the signal simulation device can simulate the output signals of a vibration sensor and a rotating speed sensor of a rotor table or an engine through an electronic circuit, so that the flexibility of the test is improved; the signal simulation device is controlled by an upper computer through a communication interface, and information such as amplitude, phase, rotating speed, test mode (continuous, single and the like) and the like of vibration and rotating speed signals is set so as to realize programmed and automatic test.

Schematic diagrams of still other embodiments of the signal simulation apparatus of the present disclosure are shown in fig. 5. The signal simulation device can be realized by adopting a high-speed analog signal output board card with phase adjustment and synchronous output functions and a charge conversion module, and can also be realized by a special hardware circuit.

An SOC (System-on-a-Chip) Chip 504 receives information such as amplitude, phase angle and rotating speed of vibration and rotating speed signals sent by an upper computer 501 through an RS232 serial interface (asynchronous transmission standard interface) 502, reads original data of vibration and rotating speed waveforms from a Flash 503, calculates vibration and rotating speed waveform data meeting target amplitude through a built-in program, stores the vibration and rotating speed waveform data in an SRAM (Static Random-Access Memory), reads waveform data from the SRAM 505 according to phase difference requirements, outputs the waveform data to a D/A (Digital to Analog) converter 506, synchronously triggers channels of the D/A converter according to the rotating speed requirements, controls the D/A converter to synchronously output Analog voltage signals of the vibration and the rotating speed, filters high-frequency noise signals through a low-pass filter 507 and increases driving capability, the vibration voltage signal is converted into a charge signal through the series capacitor 508, and the charge signal is output, and the rotation speed voltage signal can be directly output.

In some embodiments, SOC may be Xlinx Zynq-7000 SOC series XC7Z015 System-on-chip chips. The SOC comprises a Dual-Core ARM Cortex-A9MPcore, supports 866MHz at most, supports external expansion DDR3 SRAM and Quad-SPI Flash, supports SPI, I2C and UART communication, and contains an Artix-7 series FPGA unit in a chip.

In some embodiments, the D/A converter may be implemented using AD5754 integrated chips from Analog Devices, Inc. AD5754 is a four-channel output, 16-bit, serial input, bipolar, voltage output, settling time 10us, built-in reference voltage digital-to-analog converter. And the SPI interface is connected with the SOC, receives an instruction sent by the SOC, and converts the instruction into analog voltage of each channel for output.

In some embodiments, the low-pass filter may be two sheets of OPA2277 from Texas Instruments, and a two-way second-order butterworth low-pass filter is built, whose cut-off frequency should be set to be greater than 5 times of the highest frequency of the vibration and rotation speed signals and less than 5 times of the refresh frequency output by the D/a converter, so as to filter the high-frequency noise signals output by the D/a converter and increase the signal driving capability.

In some embodiments, the charge conversion module may employ a multi-layer ceramic capacitor with 1% accuracy connected in series to the vibration analog voltage signal output by the low pass filter to convert the voltage signal into a charge signal.

In some embodiments, the RS232 interface may employ a LTC2802 integrated circuit from Linear Technology, Inc. The power supply range of the LTC2802 is 1.8V-5.5V, and the LTC2802 supports full duplex 1Mbps communication to convert the UART interface of the MCU into RS232 level so as to realize communication with an upper computer.

In some embodiments, the upper computer is implemented on a computer by adopting Labview, wherein amplitude, phase angle, rotating speed and the like which need to be set are input by a text input control, and input by a pull-down list control in a test mode (single test, continuous test, charge collection precision test, phase angle collection stability test, rotating speed collection precision test, high tooth/low tooth and the like) is implemented by adding the data into a frame head and frame tail identification marks after the information collection is completed, and communication between a serial COM port of the computer and an RS232 interface of a signal simulation device is implemented by the VISA control.

The signal simulation device synchronously outputs the expected vibration and rotating speed signals in an electronic hardware mode, and can adjust the amplitude, the frequency and the phase difference between the vibration signal and the rotating speed signal under the control of an upper computer and a microprocessor, so that the signal of the engine sensor is simulated, the test of the engine vibration monitoring devices such as an EVM (error vector machine) or EMU (empirical mode Unit) is supported, the problem that the existing rotor table test method is difficult to accurately set the characteristics of the vibration signal and the rotating speed signal by setting an unbalanced mass block is solved, and the test precision is improved. Meanwhile, the problems that the cost for obtaining and setting up the test equipment is high, the occupied area is large and the like in the existing rotor test bed test method can be solved, and the method plays an important role in testing, calibrating and verifying the engine vibration monitoring device.

A schematic diagram of some embodiments of the engine vibration monitoring system of the present disclosure is shown in fig. 6. The engine vibration monitoring system may include any of the signal simulating means 61 mentioned above, capable of generating vibration waveform data and rotational speed waveform data for testing. The engine vibration monitoring device 62 is capable of performing performance testing based on the vibration waveform data and the rotational speed waveform data from the signal simulating device, including acquiring the vibration and rotational speed analog signals output by the signal simulating device, analyzing and calculating the acquired signals, comparing the analyzed signals with a set value, and verifying the functional performance of hardware and software thereof.

The system can utilize the vibration waveform and the rotating speed waveform signal generated in a simulation mode as a test basis for the transmitter vibration monitoring system, thereby not only adopting a rotor table or an engine to carry out the test, but also improving the flexibility in the aspects of site occupation and test parameter configuration and improving the comprehensiveness of the test.

A flow diagram of some embodiments of the signal simulation method of the present disclosure is shown in fig. 7.

In step 701, target parameters and raw waveform data are acquired. The target parameters comprise a target amplitude, a target phase angle and a target rotating speed, and the original waveform data comprises vibration original waveform data and rotating speed original waveform data. In some embodiments, the raw waveform data may be retrieved from memory, and target parameters may be obtained from an upper computer or input through a control surface.

In some embodiments, a tester can set required target parameters according to requirements and arbitrarily set the vibration amplitude, the phase between the vibration signal and the rotation speed, so that the problems that the vibration value of the existing rotor table or engine is not flexible to adjust through a mass block, the phase is not flexible to adjust through the mass block, and the rotation speed is not flexible to adjust are solved, and the flexibility of test data is improved. In some embodiments, the sensor waveform data can be arbitrarily set to be low teeth or high teeth so as to adapt to the test of different tone wheel types and expand the application range of the signal simulation device.

In some embodiments, a test mode can be set through the upper computer, for example, corresponding parameters such as single test, continuous test, charge collection precision test, phase angle collection stability test and rotating speed collection precision test are set, programming and automatic test are achieved, and compared with a test using a rotor table or an engine, the test is more convenient and faster, and the test efficiency is higher.

In step 702, the original waveform data is adjusted according to the target amplitude and the target phase angle from the data obtaining module to obtain first waveform data, wherein the first waveform data includes first vibration waveform data and first rotational speed waveform data. In some embodiments, the amplitude of the raw waveform data may be adjusted according to a target amplitude; and determining the phase difference of the vibration waveform data and the rotating speed waveform data extracted from the first waveform data after the amplitude is adjusted according to the target phase angle, and acquiring second waveform data.

In step 703, the first vibration waveform data and the first rotational speed waveform data are synchronously converted into analog signals according to the target rotational speed, and second waveform data is obtained, wherein the second waveform data includes the second vibration waveform data and the second rotational speed waveform data. In some embodiments, the second waveform data may be further filtered to filter out harmonic signals having frequencies higher than the predetermined frequency.

In step 704, the second vibration waveform data is converted into third vibration waveform data in the form of an electric charge signal. In some embodiments, the second vibration waveform data in the form of a voltage may be converted into third vibration waveform data in the form of a charge signal by a series capacitance. In some embodiments, the filtered second vibration waveform data may be charge converted to generate third vibration waveform data.

In step 705, the second rotational speed waveform data and the third vibration waveform data are output as test data of the engine vibration monitoring device. In some embodiments, the output second tachometer waveform data is low pass filtered second tachometer waveform data.

By the method, the vibration waveform and the rotating speed waveform signal can be generated in a simulation mode and used as a test basis for the transmitter vibration monitoring system, so that the flexibility can be improved in the aspects of site occupation and test parameter configuration without adopting a rotor table or an engine for testing, and the comprehensiveness of the test can also be improved.

A flow chart of some embodiments of a method of testing an engine vibration monitoring device of the present disclosure is shown in fig. 8.

In step 801, third vibration waveform data and second rotational speed waveform data for testing are generated by any one of the signal simulation methods mentioned hereinabove.

In step 802, the generated third vibration waveform data and second rotational speed waveform data are input to an engine vibration monitoring system, and a performance test is performed on the engine vibration monitoring system

By the method, the vibration waveform and the rotating speed waveform signal generated in a simulation mode can be used as a test basis for the transmitter vibration monitoring system, so that the flexibility can be improved in the aspects of site occupation and test parameter configuration without adopting a rotor table or an engine for testing, and the comprehensiveness of the test can also be improved.

Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the specific embodiments of the disclosure or equivalent substitutions for parts of the technical features may still be made; all such modifications are intended to be included within the scope of the claims of this disclosure without departing from the spirit thereof.