阅读说明：本技术 一种模型倾角测量装置的校准装置及其校准方法 (Calibration device and calibration method for model inclination angle measurement device ) 是由 阎成 邓晓曼 蒋明华 蒋婧妍 范金磊 马列波 邓章林 贾霜 张胜 李兵 车林森 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种模型倾角测量装置的校准装置及其校准方法。校准装置包括地面校准装置和模型校准装置；地面校准装置为固定在地面的地面测试平台；模型校准装置为安装在试验模型内腔的模型测试平台。校准方法基于校准装置,校准对象为模型倾角测量装置,模型倾角测量装置集成有石英倾角仪和振动传感器；校准过程中模型倾角测量装置通过RS-422通讯协议与计算机进行数据交换。本发明的模型倾角测量装置的校准装置及其校准方法获得了石英倾角仪的静态校准公式和滤波截至频率,获得了振动传感器的带通截至频率,实现了动态环境下风洞模型俯仰角的高精度测量的模型倾角测量装置的校准,为开展相关试验提供了技术支持。(The invention discloses a calibration device and a calibration method for a model inclination angle measurement device. The calibration device comprises a ground calibration device and a model calibration device; the ground calibration device is a ground test platform fixed on the ground; the model calibration device is a model test platform arranged in the inner cavity of the test model. The calibration method is based on a calibration device, a calibration object is a model inclination angle measuring device, and the model inclination angle measuring device is integrated with a quartz inclinometer and a vibration sensor; and the model inclination angle measuring device exchanges data with the computer through an RS-422 communication protocol in the calibration process. The calibration device and the calibration method of the model inclination angle measuring device of the invention obtain the static calibration formula and the filtering cutoff frequency of the quartz inclinometer, obtain the band-pass cutoff frequency of the vibration sensor, realize the calibration of the model inclination angle measuring device for the high-precision measurement of the wind tunnel model pitch angle in the dynamic environment, and provide technical support for developing the related tests.)

1. The calibration device of the model inclination angle measuring device is characterized by comprising a ground calibration device and a model calibration device; the ground calibration device is a ground test platform fixed on the ground; the model calibration device is a model test platform (5) arranged in the inner cavity of the test model;

the ground test platform comprises a vibration isolation mounting support fixed on the ground and a mounting platform (1) mounted on the upper surface of the vibration isolation mounting support, wherein a clamping groove is formed in the mounting platform (1), a support of the multi-tooth dividing table (2) is clamped in the clamping groove, and a plurality of screw holes matched with mounting holes of a bottom plate of the model inclination angle measuring device (4) are formed in the horizontal plane of a test platform (3) of the multi-tooth dividing table (2); the multi-tooth dividing table (2) is externally connected with a program control system; wherein, the planeness deviation of the mounting platform (1) is less than 0.01/1000, the twist is less than 0.01/1000, and the mounting platform has horizontal adjustment capability; the minimum division value of the multi-tooth division table (2) is 0.5 degrees; the precision grade of the horizontal plane of the test platform (3) is I grade, and the flatness error is less than 10 mu m; the verticality between the horizontal plane of the test platform (3) and the radial plane of the main shaft of the multi-tooth dividing table (2) is less than 1';

the model test platform (5) is of a cylinder structure, the upper part and the rear end of the cylinder are open, and the front end of the cylinder is closed; the front end of the cylinder is provided with a mounting hole (6), and a model test platform (5) is fixed in the inner cavity of the test model by a mounting screw (7) through the mounting hole (6); a horizontal mounting plane is arranged on the upper surface of the bottom of the inner wall of the cylinder, and a plurality of model inclination angle measuring device mounting holes (8) matched with the mounting holes of the bottom plate of the model inclination angle measuring device (4) are formed in the mounting plane; two parallel pitch angle and roll angle measuring planes (9) are arranged at the position of the opening of the upper cylinder wall of the cylinder.

2. A calibration method of a model inclination measuring device, characterized in that the calibration method of the model inclination measuring device is based on the calibration device of the model inclination measuring device of claim 1, the calibration object of the calibration method of the model inclination measuring device is the model inclination measuring device (4), and the model inclination measuring device (4) is integrated with a quartz inclinometer and a vibration sensor; the model inclination angle measuring device (4) exchanges data with a computer through an RS-422 communication protocol in the calibration process;

the quartz inclinometer calibration method comprises the following steps:

a1. leveling the mounting platform (1); the height regulators at four corners below the vibration isolation mounting support are manually regulated to ensure that the upper surface of the mounting platform (1) is in a horizontal state;

a2. leveling the horizontal plane of the test platform (3); measuring the horizontal plane angle of the test platform (3), starting the program control system, adjusting the horizontal plane angle of the test platform (3) to 0 degree through the multi-tooth dividing table (2) and marking as a zero position;

a3. installing a model inclination angle measuring device (4); the model inclination angle measuring device (4) is fixedly arranged on the horizontal plane of the test platform (3) through screws;

a4. calibrating a quartz inclinometer of the model inclination angle measuring device (4); setting a step angle sequence in the measuring range of the model inclination angle measuring device (4); the rotation angle of the test platform (3) is changed in sequence according to the step angle sequence through the program control system, the computer records the output data of the quartz inclinometer of the model inclination angle measuring device (4), and a least square method is adopted to fit to obtain a calibration formula of the quartz inclinometer:

in the formula:g _i is the angle of attack value, rad;

data8 _i is prepared by reacting withg _i The quartz inclinometer output value V in one-to-one correspondence;

is a zeroth order coefficient;

is a first order coefficient;

is a second order coefficient;

a5. writing the calibration formula coefficient of a quartz inclinometer of the model inclination angle measuring device (4) into the model inclination angle measuring device (4) by a computer through an RS-422 communication protocol;

the calibration method of the filter cut-off frequency of the quartz inclinometer and the band-pass cut-off frequency of the vibration sensor comprises the following steps:

b1. installing a model test platform (5); the mounting screw (7) penetrates through the mounting hole (6) and is screwed into a screw hole arranged in the inner cavity of the test model, and the model test platform (5) is fixedly mounted in the inner cavity of the test model;

b2. a leveling model test platform (5); measuring the roll angle of a pitch angle and roll angle measuring plane (9), leveling the pitch angle and roll angle measuring plane (9), screwing down a mounting screw (7) and ensuring that the roll angle of the model testing platform (5) is less than 1';

b3. installing a model inclination angle measuring device (4); screwing down screws on the mounting holes (8) of the model inclination angle measuring device, and mounting the model inclination angle measuring device (4) on the model test platform (5);

b4. carrying out vibration frequency calibration of the test model; using a rubber hammer knocking model, collecting vibration data of a model inclination angle measuring device (4) by a computer, and obtaining a first test model by adopting a frequency spectrum analysis algorithmOrder vibration frequency f₁And second order vibration frequency f₂；

b5. Setting a filtering parameter value of the model inclination angle measuring device (4); lower limit f of filter parameter value_down=f₁-f_aUpper limit value f of filter parameter value_up=f₂+f_b，f_aAnd f_bFor manually setting value, f_aAnd f_bThe value range of (A) is 5 Hz-10 Hz;

b6. taking the filter cutoff frequency of the quartz inclinometer as f_downCutting the filter of the quartz inclinometer to the frequency f_downWriting the model inclination angle measuring device (4) through an RS-422 communication protocol;

b7. taking the band-pass cutoff frequency of the vibration sensor as f_down、f_upWriting the model inclination angle measuring device (4) through an RS-422 communication protocol;

b8. the deviation between the pitching angle of the test model and the pitching angle of the model inclination angle measuring device (4) is calibrated; adjusting the pitch angle of the test model to zero through the wind tunnel supporting mechanism, and acquiring the pitch angle alpha of the model test platform (5) by adopting a high-precision level meter by taking a pitch angle and roll angle measurement plane (9) as a measurement reference_M0And simultaneously acquiring the pitch angle alpha of the model inclination angle measuring device (4) through computer acquisition_A0Thus, the deviation value delta alpha of the pitch angle of the test model and the pitch angle of the model inclination angle measuring device (4) is obtained₀=α_M0-α_A0；

b9. Deviation value delta alpha of pitching angle of test model and pitching angle of model inclination angle measuring device (4)₀And writing the data into the model inclination angle measuring device (4) through an RS-422 communication protocol.

3. The calibration method of the model inclination angle measuring device according to claim 2, characterized in that the number of the step angles of the step angle sequence is 5-11.

Technical Field

The invention belongs to the technical field of wind tunnel tests, and particularly relates to a calibration device and a calibration method of a model inclination angle measurement device.

Background

The conventional model attack angle measurement of the wind tunnel is realized by firstly measuring the angle of a model supporting mechanism actually and then obtaining the attitude angle of the model through the correction and conversion of the elastic angle of a balance. Because the wind tunnel model supporting mechanism drives the model to move through the transmission device, errors can be introduced into the mechanism angle connection clearance and the angle conversion, and errors can be introduced into the balance elastic angle correction formula obtained by static loading, so that the precision of the model attack angle measured by the indirect method is generally only +/-0.05 degrees. Particularly, when the model-strut system runs continuously, working conditions such as vibration, centripetal acceleration and the like affect test data, and high-precision test data are more difficult to obtain. Real-time measurements and error compensation corrections are required, such as: the J7 model was tested at α =4 ° across supersonic velocities, 25% of the drag coefficient Cx error was caused by the angle of attack error, and Δ Cx = ± 0.0001 corresponds to an angle of attack error Δ α = ± 0.01 °. Therefore, the realization of real-time direct and accurate measurement of the attack angle of the model is particularly important for ensuring the acquisition of high-precision continuous aerodynamic force test data. Therefore, a model inclination angle measuring device based on the inertia technology is developed in a matched manner, and accurate measurement of the model inclination angle under the working conditions of high impact and strong vibration of the high-speed wind tunnel is realized.

In the wind tunnel test process, interference factors such as coupling errors caused by vibration, centripetal acceleration and installation misalignment will seriously affect the measurement accuracy of the model inclination angle measurement device, so that the development of a calibration device and a calibration method thereof suitable for the model inclination angle measurement device is urgently needed.

Disclosure of Invention

The invention aims to provide a calibration device of a model inclination angle measurement device, and the invention aims to provide a calibration method of the model inclination angle measurement device.

According to the calibration method of the model inclination angle measuring device, the deviation between the pitching angle of the test model and the pitching angle of the model inclination angle measuring device is calibrated through the model test platform.

According to the calibration method of the model inclination angle measuring device, the vibration frequency test of the test model is completed by adopting a rubber hammer knocking mode through the model test platform.

The calibration method of the model inclination angle measuring device writes the filtering cut-off frequency of the quartz inclinometer and the band-pass cut-off frequency of the vibration sensor into the model inclination angle measuring device.

The invention relates to a calibrating device of a model inclination angle measuring device, which is characterized in that the calibrating device comprises a ground calibrating device and a model calibrating device; the ground calibration device is a ground test platform fixed on the ground; the model calibration device is a model test platform arranged in the inner cavity of the test model;

the ground test platform comprises a vibration isolation mounting support fixed on the ground and a mounting platform mounted on the upper surface of the vibration isolation mounting support, a clamping groove is formed in the mounting platform, the support of the multi-tooth dividing table is clamped in the clamping groove, and a plurality of screw holes matched with the mounting holes of the bottom plate of the model inclination angle measuring device are formed in the horizontal plane of the test platform of the multi-tooth dividing table; the multi-tooth dividing table is externally connected with a program control system; wherein, the planeness deviation of the mounting platform is less than 0.01/1000, the distortion is less than 0.01/1000, and the mounting platform has horizontal adjustment capability; the minimum division value of the multi-tooth division table is 0.5 degrees; the precision grade of the horizontal plane of the test platform is I grade, and the flatness error is less than 10 mu m; the verticality between the horizontal plane of the test platform and the radial plane of the main shaft of the multi-tooth dividing table is less than 1';

the model test platform is of a cylinder structure, the upper part and the rear end of the cylinder are opened, and the front end of the cylinder is closed; the front end of the cylinder is provided with a mounting hole, and the mounting screw fixes the model test platform in the inner cavity of the test model through the mounting hole; a horizontal mounting plane is arranged on the upper surface of the bottom of the inner wall of the cylinder, and a plurality of model inclination angle measuring device mounting holes matched with the mounting holes of the bottom plate of the model inclination angle measuring device are formed in the mounting plane; two parallel pitch angle and roll angle measuring planes are arranged at the position of the opening of the upper cylinder wall of the cylinder.

The calibration method of the model inclination angle measuring device is based on a calibration device of the model inclination angle measuring device, a calibration object is the model inclination angle measuring device, and the model inclination angle measuring device is integrated with a quartz inclinometer and a vibration sensor; the model inclination angle measuring device exchanges data with a computer through an RS-422 communication protocol in the calibration process;

the quartz inclinometer calibration method comprises the following steps:

a1. leveling the mounting platform; manually adjusting height adjusters positioned at four corners below the vibration isolation mounting support to ensure that the upper surface of the mounting platform is in a horizontal state;

a2. leveling the horizontal plane of the test platform; measuring the horizontal plane angle of the test platform, starting the program control system, adjusting the horizontal plane angle of the test platform to 0 degree through the multi-tooth dividing table, and marking as a zero position;

a3. installing a model inclination angle measuring device; fixedly mounting the model inclination angle measuring device on the horizontal plane of the test platform through screws;

a4. calibrating a quartz inclinometer of the model inclination angle measuring device; setting a step angle sequence within the range of the model inclination angle measuring device; the rotation angle of the test platform is sequentially changed through the program control system according to the step angle sequence, the computer records the output data of the quartz inclinometer of the model inclination angle measuring device, and a least square method is adopted to fit to obtain a calibration formula of the quartz inclinometer:

in the formula:g _i is the angle of attack value, rad;

data8 _i is prepared by reacting withg _i The quartz inclinometer output value V in one-to-one correspondence;

is a zeroth order coefficient;

is a first order coefficient;

is a second order coefficient;

a5. writing the calibration formula coefficient of a quartz inclinometer of the model inclination angle measuring device into the model inclination angle measuring device by a computer through an RS-422 communication protocol;

the calibration method of the filter cut-off frequency of the quartz inclinometer and the band-pass cut-off frequency of the vibration sensor comprises the following steps:

b1. installing a model test platform; the mounting screw penetrates through the mounting hole and is screwed into a screw hole arranged in the inner cavity of the test model, and the model test platform is fixedly mounted in the inner cavity of the test model;

b2. leveling the model test platform; measuring the roll angle of a pitch angle roll angle measuring plane, leveling the pitch angle roll angle measuring plane, screwing down a mounting screw, and ensuring that the roll angle of the model test platform is less than 1';

b3. installing a model inclination angle measuring device; screwing down screws on the mounting holes of the model inclination angle measuring device, and mounting the model inclination angle measuring device on a model test platform;

b4. carrying out vibration frequency calibration of the test model; using a rubber hammer knocking model, collecting vibration data of a model inclination angle measuring device by a computer, and obtaining a first-order vibration frequency f of a test model by adopting a frequency spectrum analysis algorithm₁And second order vibration frequency f₂；

b5. Setting a filtering parameter value of a model inclination angle measuring device; lower limit f of filter parameter value_down=f₁-f_aUpper limit value f of filter parameter value_up=f₂+f_b，f_aAnd f_bFor manually setting value, f_aAnd f_bThe value range of (A) is 5 Hz-10 Hz;

b6. taking the filter cutoff frequency of the quartz inclinometer as f_downCutting the filter of the quartz inclinometer to the frequency f_downWriting the model inclination angle measuring device through an RS-422 communication protocol;

b7. taking the band-pass cutoff frequency of the vibration sensor as f_down、f_upWriting the model inclination angle measuring device through an RS-422 communication protocol;

b8. testing deviation correction of the pitching angle of the model and the pitching angle of the model inclination angle measuring device; adjusting the pitch angle of the test model to zero through the wind tunnel supporting mechanism, taking a pitch angle and roll angle measuring plane as a measuring reference at the moment, and obtaining the pitch angle alpha of the model test platform by adopting a high-precision level meter_M0And simultaneously acquiring the pitch angle alpha of the model dip angle measuring device through computer acquisition_A0Thus, the deviation value delta alpha of the pitch angle of the test model and the pitch angle of the model inclination angle measuring device is obtained₀=α_M0-α_A0；

b9. Deviation value delta alpha of pitching angle of test model pitching angle and model inclination angle measuring device₀And writing the data into the model inclination angle measuring device through an RS-422 communication protocol.

Furthermore, the number of the step angles of the step angle sequence is 5-11.

The calibration method of the model inclination angle measuring device is suitable for calibration of a model inclination angle measuring device for dynamic measurement, obtains a static calibration formula and a filtering cut-off frequency of a quartz inclinometer, obtains a band-pass cut-off frequency of a vibration sensor, realizes calibration of the model inclination angle measuring device for high-precision measurement of a wind tunnel model pitch angle in a dynamic environment, and provides technical support for developing related tests.

Drawings

FIG. 1 is a ground calibration device of the model inclination angle measurement device according to the present invention;

fig. 2 shows a model calibration device in the calibration device of the model inclination angle measurement device according to the present invention.

In the drawings, 1. a mounting platform; 2. a multi-tooth indexing table; 3. a test platform; 4. a model inclination angle measuring device; 5. a model test platform; 6. mounting holes; 7. mounting screws; 8. a mounting hole of a model inclination angle measuring device; 9. pitch angle and roll angle measurement plane.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1

The calibration device of the model inclination angle measurement device of the present embodiment includes a ground calibration device as shown in fig. 1 and a model calibration device as shown in fig. 2; the ground calibration device is a ground test platform fixed on the ground; the model calibration device is a model test platform 5 arranged in the inner cavity of the test model;

the ground test platform comprises a vibration isolation mounting support fixed on the ground and a mounting platform 1 mounted on the upper surface of the vibration isolation mounting support, a clamping groove is formed in the mounting platform 1, a support of the multi-tooth dividing table 2 is clamped in the clamping groove, and a plurality of screw holes matched with mounting holes of a bottom plate of the model inclination angle measuring device 4 are formed in the horizontal plane of a test platform 3 of the multi-tooth dividing table 2; the multi-tooth dividing table 2 is externally connected with a program control system; wherein, the planeness deviation of the mounting platform 1 is less than 0.01/1000, the twist is less than 0.01/1000, and the mounting platform has horizontal adjustment capability; the minimum division value of the multi-tooth division table 2 is 0.5 degrees; the precision grade of the horizontal plane of the test platform 3 is I grade, and the flatness error is less than 10 mu m; the verticality between the horizontal plane of the test platform 3 and the radial plane of the main shaft of the multi-tooth dividing table 2 is less than 1';

the model test platform 5 is of a cylinder structure, the upper part and the rear end of the cylinder are open, and the front end of the cylinder is closed; the front end of the cylinder is provided with a mounting hole 6, and a model test platform 5 is fixed in the inner cavity of the test model through the mounting hole 6 by a mounting screw 7; a horizontal mounting plane is arranged on the upper surface of the bottom of the inner wall of the cylinder, and a plurality of model inclination angle measuring device mounting holes 8 matched with the mounting holes of the bottom plate of the model inclination angle measuring device 4 are formed in the mounting plane; two parallel pitch angle and roll angle measuring planes 9 are arranged at the position of the opening of the upper cylinder wall of the cylinder.

The calibration method of the model inclination angle measuring device of the embodiment is based on the calibration device of the model inclination angle measuring device, the calibration object is the model inclination angle measuring device 4, and the model inclination angle measuring device 4 is integrated with a quartz inclinometer and a vibration sensor; the model inclination angle measuring device 4 exchanges data with a computer through an RS-422 communication protocol in the calibration process;

the quartz inclinometer calibration method comprises the following steps:

a1. leveling the mounting platform 1; manually adjusting height adjusters positioned at four corners below the vibration isolation mounting support to ensure that the upper surface of the mounting platform 1 is in a horizontal state;

a2. leveling the horizontal plane of the test platform 3; measuring the horizontal plane angle of the test platform 3, starting the program control system, adjusting the horizontal plane angle of the test platform 3 to 0 degree through the multi-tooth dividing table 2, and marking as a zero position;

a3. installing a model inclination angle measuring device 4; fixedly mounting the model inclination angle measuring device 4 on the horizontal plane of the test platform 3 through screws;

a4. calibration of the quartz inclinometer of the model inclination angle measuring device 4; setting a step angle sequence in the range of the model inclination angle measuring device 4; the rotation angle of the test platform 3 is changed in sequence according to the step angle sequence through the program control system, the computer records the quartz inclinometer output data of the model inclination angle measuring device 4, and the calibration formula of the quartz inclinometer is obtained by adopting least square fitting:

in the formula:g _i is the angle of attack value, rad;

data8 _i is prepared by reacting withg _i The quartz inclinometer output value V in one-to-one correspondence;

is a zeroth order coefficient;

is a first order coefficient;

is a second order coefficient;

a5. writing the calibration formula coefficient of the quartz inclinometer of the model inclination angle measuring device 4 into the model inclination angle measuring device 4 by a computer through an RS-422 communication protocol;

the calibration method of the filter cut-off frequency of the quartz inclinometer and the band-pass cut-off frequency of the vibration sensor comprises the following steps:

b1. installing a model test platform 5; the mounting screw 7 penetrates through the mounting hole 6 and is screwed into a screw hole arranged in the inner cavity of the test model, and the model test platform 5 is fixedly mounted in the inner cavity of the test model;

b2. leveling the model test platform 5; measuring the roll angle of a pitch angle roll angle measuring plane 9, leveling the pitch angle roll angle measuring plane 9, screwing down the mounting screw 7, and ensuring that the roll angle of the model test platform 5 is less than 1';

b3. installing a model inclination angle measuring device 4; screwing down screws on the mounting holes 8 of the model inclination angle measuring device, and mounting the model inclination angle measuring device 4 on the model test platform 5;

b4. carrying out vibration frequency calibration of the test model; using a rubber hammer knocking model, collecting vibration data of the model inclination angle measuring device 4 by a computer, and obtaining a first-order vibration frequency f of a test model by adopting a spectrum analysis algorithm₁And second order vibration frequency f₂；

b5. Setting a filtering parameter value of the model inclination angle measuring device 4; lower limit f of filter parameter value_down=f₁-f_aUpper limit value f of filter parameter value_up=f₂+f_b，f_aAnd f_bFor manually setting value, f_aAnd f_bThe value range of (A) is 5 Hz-10 Hz;

b6. taking the filter cutoff frequency of the quartz inclinometer as f_downCutting the filter of the quartz inclinometer to the frequency f_downWriting the model inclination angle measuring device 4 through an RS-422 communication protocol;

b7. taking the band-pass cutoff frequency of the vibration sensor as f_down、f_upWriting the model inclination angle measuring device 4 through an RS-422 communication protocol;

b8. the deviation between the pitching angle of the test model and the pitching angle of the model inclination angle measuring device 4 is calibrated; adjusting the pitch angle of the test model to zero through the wind tunnel supporting mechanism, and then obtaining the pitch angle alpha of the model test platform 5 by using a high-precision level meter by taking a pitch angle and roll angle measurement plane 9 as a measurement reference_M0And simultaneously acquiring the pitch angle alpha of the model inclination angle measuring device 4 through computer acquisition_A0Thus, the deviation value delta alpha of the pitching angle of the test model and the pitching angle of the model inclination angle measuring device 4 is obtained₀=α_M0-α_A0；

b9. Deviation value delta alpha of pitching angle of test model and pitching angle of model inclination angle measuring device 4₀The data is written into the model inclination angle measuring device 4 through an RS-422 communication protocol.

Furthermore, the number of the step angles of the step angle sequence is 5-11.

Although the embodiments of the present invention have been disclosed, the embodiments are not limited to the applications listed in the description and the embodiments, and can be fully applied to various fields of hypersonic boundary layer transition mode methods suitable for the present invention. Additional modifications and refinements of the present invention will readily occur to those skilled in the art without departing from the principles of the present invention, and therefore the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.