阅读说明：本技术 一种全数字式电磁振动台系统及其工作方法 (All-digital electromagnetic vibration table system and working method thereof ) 是由 刘代伦 刘云轩 于 2018-06-21 设计创作，主要内容包括：本发明提供了一种全数字式电磁振动台系统及其工作方法。所述系统包括数字振动台、数字信号处理模块、开关电路、电源。所述数字信号处理模块由信号预处理单元、时基电路、模数转换电路、延时单元、编码变换单元组成。本发明克服了传统振动台效能低、噪声干扰大、失真严重、发热严重的缺点,也避免了半数字化的振动台系统电感性、发热、失真、精准性、频率特性差的问题,通过全数字化的控制使得数字振动台的效能高、频率特性好、抗干扰能力强,能更好的适应技术发展的趋势。(The invention provides a full-digital electromagnetic vibration table system and a working method thereof. The system comprises a digital vibration table, a digital signal processing module, a switching circuit and a power supply. The digital signal processing module consists of a signal preprocessing unit, a time base circuit, an analog-to-digital conversion circuit, a time delay unit and a coding conversion unit. The invention overcomes the defects of low efficiency, large noise interference, serious distortion and serious heating of the traditional vibration table, also avoids the problems of poor inductance, heating, distortion, accuracy and frequency characteristic of a semi-digital vibration table system, and ensures that the digital vibration table has high efficiency, good frequency characteristic and strong anti-interference capability through full-digital control and can better adapt to the trend of technical development.)

1. A full digital electromagnetic vibration table system is characterized by comprising a digital vibration table, a digital signal processing module, a switch circuit and a power supply; the digital vibration table comprises a vibration table top, a base body positioned below the vibration table top, a spring, a Wheats ring and a magnetic conduction ring; two ends of the spring are respectively fixed with one side of the vibration table board and the base body; the magnetic core is arranged on the substrate, the magnetic conduction ring is arranged on the magnetic core, and the inner ring at the upper end part of the magnetic conduction ring is tightly attached to the Huasi outer ring; an adsorption mechanism is arranged between the magnetic core and the vibration table-board; under the control of the switch circuit, the adsorption mechanism can enable the vibration table top to be close to the base body;

the digital signal processing module consists of a signal preprocessing unit, a time base circuit, an analog-to-digital conversion circuit, a time delay unit and a coding conversion unit; the signal preprocessing unit and the analog-to-digital conversion circuit are sequentially connected, the time-base circuit is connected with the analog-to-digital conversion circuit and the delay unit, and the output end of the delay unit is connected with the coding conversion unit;

the analog-to-digital conversion circuit is used for converting the analog signal output by the signal preprocessing unit into a digital signal;

the coding conversion unit is used for coding and converting the output signal of the analog-digital conversion circuit into a control signal for controlling the switch circuit;

the time base circuit is used for generating clock pulses, providing the clock pulses to the analog-to-digital conversion circuit for sampling and latching, and providing the clock pulses to the code conversion unit as time base carriers after the clock pulses are delayed by the delay unit;

the switch circuit is used for controlling the on-off of the current in the adsorption mechanism;

the power supply comprises a stabilized voltage power supply and a stabilized current power supply, wherein the stabilized voltage power supply is provided for the vibration controller, the analog-to-digital conversion circuit, the coding conversion unit and the detection feedback unit, and the stabilized current power supply is provided for the switching circuit.

2. The system according to claim 1, wherein the adsorption mechanism comprises a plurality of sets of moving coils and frameworks thereof arranged below the vibration table, and an excitation magnetic field generating device arranged on the magnetic core and positioned in the region surrounded by the magnetic conductive rings; the plurality of groups of moving coils are connected with the switch circuit.

3. The system according to claim 2, wherein the excitation magnetic field generator is an excitation control coil wound around a protrusion provided at a middle position of the magnetic core.

4. The all-digital electromagnetic vibration table system as claimed in claim 2, wherein said excitation magnetic field generating means is a permanent magnet.

5. The system according to claim 1, wherein the adsorption mechanism comprises an armature disposed under the vibration table and a plurality of excitation control coils wound around the protrusion, and the plurality of excitation control coils are connected to the switch circuit.

6. The digital all-digital electromagnetic vibration table system as claimed in claim 1, wherein said transcoding unit has a workflow of:

the method comprises the following steps: taking the highest bit in the received parallel binary code, namely the weight maximum bit, as a positive and negative sign identification code;

step two: the positive and negative symbol identification codes and the rest binary codes of each bit are subjected to logic AND to obtain positive group binary codes of bit weights; and performing logical AND on the negative and positive sign identification codes after negation of the rest binary codes to obtain the negative group bit weight binary codes. And simultaneously, performing logical AND on the rest binary codes of each bit and clock pulses to obtain a positive group bit weight binary code and a negative group bit weight binary code with clock information.

7. The system of claim 1, wherein the transcoding unit is operable to:

the method comprises the following steps: logically AND-ing the received pulse width modulation code and the time pulse to change the pulse width waveform into a pulse waveform corresponding to the number of the time pulse;

step two: inputting the pulse waveform obtained in the step one into a counter;

step three: the output end of the counter is correspondingly connected with the input end of the 1-byte switch circuit.

8. The system of claim 1, further comprising a plurality of mutual inductance and follow current processing circuits, each of which is disposed corresponding to one of the excitation control coil and the moving coil, the circuit is composed of a follow current unit and a transient suppression unit connected in series, one end of the series circuit is connected to a connection point of the corresponding excitation control coil and the power supply, and the other end of the series circuit is connected to a connection point of the corresponding excitation control coil and the switching circuit.

9. The system according to claim 1, further comprising a vibration controller and a detection feedback unit, wherein the output end of the vibration controller is connected to the digital signal processing module, the input end of the vibration controller is connected to the vibration sensor, the detection feedback unit comprises a vibration sensor and an a/D conversion unit, the vibration sensor and the a/D conversion unit are disposed on the digital vibration table, and the vibration signal of the vibration table is collected, converted and fed back to the vibration controller.

10. A method of operating an all-digital electromagnetic vibration table system as claimed in any one of claims 1 to 9, comprising the steps of:

the method comprises the following steps: the signal preprocessing circuit performs gain control, filtering and bidirectional amplitude limiting processing on the received signals and outputs the signals to the analog-to-digital conversion circuit;

step two: the analog-to-digital conversion circuit converts the analog signal output by the signal preprocessing circuit into a digital signal and outputs the digital signal to the coding conversion unit;

step three: the coding conversion unit converts the input signal into a control signal for controlling the switch circuit;

step four: when the adsorption mechanism is powered on under the control of the switch circuit, a magnetic field is generated, the vibration table board and the base body are close to each other under the acting force of the adsorption mechanism, meanwhile, the spring is compressed, when the control signal passes through zero, the attraction is zero, and the compressed spring rebounds to enable the vibration table to move upwards.

Technical Field

The invention relates to the technical field of industrial control, in particular to a full-digital electromagnetic vibration table system and a working method thereof.

Background

Traditional simulation shaking table system lets in half amplitude analog signal in iron core excitation control coil, forms half amplitude pulse magnetic field in the iron core, attracts armature downstream, drives the mesa downstream, and compression spring simultaneously, when control signal zero crossing, the appeal is zero, and the spring of compressed kick-backs, makes the up-going motion of vibration mesa. Its disadvantages are low efficiency (less than 50% of the efficiency of the analog amplifier), large noise interference, serious distortion and serious heat generation.

The semi-digital vibration table system digitizes the control signal of the vibration controller, amplify process (such as D amplifier) with the switching circuit, then the filtering is reduced and outputted to the control coil into the analog signal, the amplifier efficiency has greater promotion (can reach 80-90%), the distortion is improved greatly, the heating is smaller too much, but the amplifier connects filtering and D/A conversion after, still there are distortion and heating, the vibration table body still works in the analog state, and present the inductive character, heating, distortion, precision, poor problem of frequency characteristic still stand out.

Disclosure of Invention

The invention provides a full-digital electromagnetic vibration table system different from a traditional vibration table and a working method thereof.

The invention relates to a full-digital electromagnetic vibration table system which comprises a digital vibration table, a digital signal processing module, a switch circuit and a power supply, wherein the digital vibration table is connected with the digital signal processing module; the digital vibration table comprises a vibration table top, a base body positioned below the vibration table top, a spring, a Wheats ring and a magnetic conduction ring; two ends of the spring are respectively fixed with one side of the vibration table board and the base body; the magnetic core is arranged on the substrate, the magnetic conduction ring is arranged on the magnetic core, and the inner ring at the upper end part of the magnetic conduction ring is tightly attached to the Huasi outer ring; an adsorption mechanism is arranged between the magnetic core and the vibration table-board; under the control of the switch circuit, the adsorption mechanism can enable the vibration table top to be close to the base body.

The digital signal processing module consists of a signal preprocessing unit, a time base circuit, an analog-to-digital conversion circuit, a time delay unit and a coding conversion unit; the signal preprocessing unit and the analog-to-digital conversion circuit are sequentially connected, the time base circuit is connected with the analog-to-digital conversion circuit and the delay unit, and the output end of the delay unit is connected with the coding conversion unit.

The analog-to-digital conversion circuit is used for converting the analog signals output by the signal preprocessing unit into digital signals.

The coding conversion unit is used for coding and converting the output signal of the analog-digital conversion circuit into a control signal for controlling the switch circuit.

The time base circuit is used for generating clock pulses, providing the clock pulses to the analog-to-digital conversion circuit for sampling and latching, and providing the clock pulses to the code conversion unit as time base carriers after the clock pulses are delayed by the delay unit.

The switch circuit is used for controlling the on-off of the current in the adsorption mechanism.

The power supply comprises a stabilized voltage power supply and a stabilized current power supply, wherein the stabilized voltage power supply is provided for the vibration controller, the analog-to-digital conversion circuit, the coding conversion unit and the detection feedback unit, and the stabilized current power supply is provided for the switching circuit.

Furthermore, the adsorption mechanism comprises a plurality of groups of moving coils arranged below the vibration table surface, a framework of the moving coils, and an excitation magnetic field generating device arranged on the magnetic core and positioned in an area surrounded by the magnetic conductive rings.

Further, the excitation magnetic field generating device is an excitation control coil wound on a protrusion arranged at the middle position of the magnetic core.

Further, the excitation magnetic field generating device is a permanent magnet.

Furthermore, the adsorption mechanism comprises an armature arranged below the vibration table surface and a plurality of groups of excitation control coils wound on the protruding portion, and the plurality of groups of excitation control coils are connected with the switch circuit.

Further, the work flow of the coding transformation unit is as follows:

the method comprises the following steps: and taking the highest bit, namely the maximum weight bit in the received parallel binary code as a positive and negative sign identification code.

Step two: and performing logical AND on the positive and negative symbol identification codes and the rest binary codes of each bit to obtain the binary codes of the positive group of the bit weights. And performing logical AND on the negative and positive sign identification codes after negation of the rest binary codes to obtain the negative group bit weight binary codes. And simultaneously, performing logical AND on the rest binary codes of each bit and clock pulses to obtain a positive group bit weight binary code and a negative group bit weight binary code with clock information.

Further, the work flow of the coding transformation unit can also be as follows:

the method comprises the following steps: and logically AND-connecting the received pulse width modulation code with the time pulse to change the pulse width waveform into a pulse waveform corresponding to the number of time pulses.

Step two: inputting the pulse waveform obtained in the step one into a counter.

Step three: the output end of the counter is correspondingly connected with the input end of the 1-byte switch circuit.

The circuit is formed by connecting a follow current unit and a transient suppression unit in series, one end of the series circuit is connected with a connection point of the corresponding excitation control coil (or moving coil) and a power supply, and the other end of the series circuit is connected with a connection point of the corresponding excitation control coil (or moving coil) and a switch circuit.

Further, still include vibration control appearance, detection feedback unit, the vibration control appearance output is connected with digital signal processing module, and the input is connected with vibration sensor, detection feedback unit is including setting up vibration sensor and the AD converting unit on digital shaking table, gather, transform the vibration signal of vibration mesa, handle and feed back to the vibration control appearance.

The working method of the all-digital electromagnetic vibration table system comprises the following steps:

the method comprises the following steps: the signal preprocessing circuit performs gain control, filtering and bidirectional amplitude limiting on the received signals and outputs the signals to the analog-to-digital conversion circuit.

Step two: the analog-to-digital conversion circuit converts the analog signal output by the signal preprocessing circuit into a digital signal and outputs the digital signal to the coding conversion unit.

Step three: the code conversion unit converts the input signal into a control signal for controlling the switch circuit.

Step four: when the adsorption mechanism is powered on under the control of the switch circuit, a magnetic field is generated, the vibration table board and the base body are close to each other under the acting force of the adsorption mechanism, meanwhile, the spring is compressed, when the control signal passes through zero, the attraction is zero, and the compressed spring rebounds to enable the vibration table to move upwards.

The invention has the beneficial effects that:

the invention overcomes the defects of low efficiency, large noise interference, serious distortion and serious heating of the traditional vibration table, also avoids the problems of poor inductance, heating, distortion, accuracy and frequency characteristic of a semi-digital vibration table system, and ensures that the digital vibration table has high efficiency, good frequency characteristic and strong anti-interference capability through full-digital control and can better adapt to the trend of technical development.

Drawings

Fig. 1 is a structure diagram of an electric digital electromagnetic vibration table.

Fig. 2 is a structural view of an electromagnetic digital electromagnetic vibration table.

FIG. 3 is a block diagram of a fully digital electromagnetic vibration table system.

In the figure: 1. the vibration table comprises a vibration table top, 2. moving coils, 3. Wheats, 4. magnetic rings, 5. excitation control coils, 6. magnetic cores, 7. a base body, 8. armatures and 9. springs.

Detailed Description

First, the hardware structure of the digital vibration table will be described.

The digital vibration table comprises a vibration table top 1, a base 7 positioned below the vibration table top 1, a spring 9, a washer 3 and a magnetic conduction ring 4; two ends of the spring 9 are respectively fixed with one side of the vibration table board 1 and the base body 7; a magnetic core 6 is arranged on the substrate 7, the magnetic conductive ring 4 is arranged on the magnetic core 6, and the inner ring of the upper end part of the magnetic conductive ring is tightly attached to the outer ring of the Huasi 3; an adsorption mechanism is arranged between the magnetic core 6 and the vibration table board 1; under the control of a switch circuit, the adsorption mechanism can enable the vibration table board 1 to be close to the base body 7.

The digital vibration table may be electromagnetic or electric depending on the adsorption mechanism.

Firstly, the method comprises the following steps: electric type:

as shown in fig. 1, the adsorption mechanism of the electric vibration table includes a plurality of sets of moving coils 2 and their frameworks disposed below the vibration table 1, and an excitation magnetic field generating device disposed on the magnetic core 6 and located in the region surrounded by the magnetic conductive rings 4. Each moving coil 2 is connected with an external switch circuit, and the on-off of the external switch circuit is controlled by a switch of the external switch circuit.

The excitation magnetic field generating means may be an excitation control coil 5 or a permanent magnet.

At least one group of protruding parts are arranged on one side of the magnetic core 6 along the direction facing the vibration table; each projection is provided with an excitation control coil 5 (or a permanent magnet) in a sleeved manner. The arrangement of the projections is two embodiments.