CN113721451A - Automatic centering device for moving part of digital vibration table - Google Patents
Automatic centering device for moving part of digital vibration table Download PDFInfo
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- CN113721451A CN113721451A CN202110944964.1A CN202110944964A CN113721451A CN 113721451 A CN113721451 A CN 113721451A CN 202110944964 A CN202110944964 A CN 202110944964A CN 113721451 A CN113721451 A CN 113721451A
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- 238000010168 coupling process Methods 0.000 claims abstract description 4
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- 238000004364 calculation method Methods 0.000 claims description 6
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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Abstract
The invention discloses an automatic centering device for a moving part of a digital vibration table, which adopts an embedded main control board based on a Linux system and is matched with a high-definition touch screen and a high-speed data acquisition module, so that the system has better operability, instantaneity and reliability. The centering control device comprises a centering control module, a touch screen, a data acquisition module, a position information detection module and an execution mechanism. The position information detection module comprises a trapezoid black and white stripe paper tape and a detector, the trapezoid black and white stripe paper tape is pasted on the moving part, the detector comprises a displacement sensor and a probe, the sensor and the probe are connected through optical fiber coupling, the data acquisition module comprises an analog-digital data acquisition chip and a peripheral filter circuit, and an analog quantity input channel of the data acquisition module is connected with an analog output channel of the displacement sensor.
Description
Technical Field
The invention relates to the technical field of acquisition of the position of a moving part of a vibrating table, calculation of a central position and pneumatic servo control of an air chamber of an air bag, in particular to a digital automatic centering device for the moving part of the vibrating table.
Background
The electric vibration table is a test device for simulating the vibration environment effect, and is widely applied to the fields of aviation, aerospace, rail transit, electronics, ship industry and the like. In the experimental process, the weight of the tested piece and the defects of the mechanical and electrical parts of the vibration table system may cause the center of the moving part of the vibration table to generate a shift phenomenon in static and dynamic states, so that the test precision of the vibration table is reduced, and even the system fails. The vibration table is used as a vibration testing device, the reliability and the precision of the vibration table directly influence the precision of a tested piece, so that the automatic centering function of a moving part of the vibration table is particularly important for the vibration table with high reliability and high precision.
At present, an automatic centering device for a moving part of a vibration table mainly comprises a position signal detection module, a signal processing module and an execution mechanism. The working principle is that a sensor is used for converting a motion signal of the vibration table into an electric signal, and a direct-current voltage signal related to the position of a motion part of the vibration table is output after operation processing, so that a corresponding actuating mechanism is driven to realize automatic centering. The automatic centering device for the moving part of the vibration table at home and abroad generally selects an eddy current sensor or a photoelectric switch to detect and acquire the central position of the moving part of the vibration table, and a signal processing module is realized by adopting an analog circuit, so that the automatic centering device has the main defects of low centering precision, poor anti-interference capability, possibility of misjudgment and the like. Therefore, it is desirable to develop an automatic centering device for moving parts of a digital vibration table to solve the above problems.
Disclosure of Invention
The invention aims to provide an automatic centering device for a moving part of a digital vibration table, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a digital shaking table moving part automatic centering device, includes trapezoidal black and white strip paper tape and detector, the detector includes displacement sensor and displacement sensor probe, trapezoidal black and white strip paper tape pastes on the moving part, displacement sensor and displacement sensor probe pass through optical fiber coupling and connect, and data acquisition module includes analog-digital data acquisition chip and peripheral filtering unit, and analog input and data output are connected with displacement sensor and centering control module respectively, and actuating mechanism includes the gasbag, the air compressor machine, the vacuum pump, admission valve and air outlet valve, and admission valve one end links to each other with the air compressor machine, and the other end links to each other with the gasbag of shaking table, and air outlet valve one end links to each other with the gasbag of shaking table, and the other end links to each other with the vacuum pump, and the below at the moving part is established to the gasbag.
As a further technical scheme of the invention, the centering control module is also connected with a touch screen.
As a further technical scheme of the invention, the air bag can be inflated and deflated to adjust the lifting of the moving part.
According to the further technical scheme, the displacement sensor probe is used for measuring and amplifying infrared light received by the optical fiber and outputting 0-5V direct current voltage quantity at different heights of the trapezoidal black and white strip paper tape according to the infrared light total reflection principle.
As a further technical scheme of the invention, the data acquisition module converts the analog quantity output by the displacement sensor into a digital quantity of bit unsigned integer and transmits the digital quantity to the centering control module through the SPI bus.
As a further technical scheme of the invention, the centering control module is loaded with a Linux real-time operating system.
As a further technical solution of the present invention, the centering control module performs data format conversion on the received original digital quantity, calculates the center position of the moving part, brings the calculation result into an internal automatic centering PID control algorithm, and finally outputs control signals for the air inlet valve and the air outlet valve.
Compared with the prior art, the invention has the beneficial effects that:
1. the position information detection module adopts an analog photoelectric sensor, has the advantages of high detection precision and strong anti-interference capability, the analog quantity which represents the position information and is output by the sensor is converted into a digital signal through data acquisition and conditioning, and then the centering control is carried out, and the problem that the analog control signal is easily interfered to cause misjudgment of a centering system is avoided by a digital control mode.
2. The centering control system based on the embedded Linux system and matched with the touch screen is more convenient to operate, richer in display information and more compatible in display effect.
3. The centering control module is combined with an internal digital PID control algorithm, so that the centering of the moving part of the vibration table can be realized more quickly and more stably.
Drawings
Fig. 1 is a schematic diagram of the digital moving part automatic centering device of the invention.
Fig. 2 is a schematic diagram of the logic structure of the digital moving part automatic centering device of the invention.
Fig. 3 is a schematic diagram of the digital moving part automatic centering device of the present invention.
In the figure: the system comprises a vacuum pump 1, an air outlet valve 2, a centering control module 3, a touch screen 4, a data acquisition module 5, a displacement sensor 6, a displacement sensor probe 7, a trapezoidal black-and-white strip paper tape 8, a moving part 9, an air bag 10, an air compressor 11 and an air inlet valve 12.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, example 1: the utility model provides a digital shaking table moving part automatic centering device, including trapezoidal black and white strip paper tape 8 and detector, the detector includes displacement sensor 6 and displacement sensor probe 7, trapezoidal black and white strip paper tape 8 is pasted on moving part 9, displacement sensor 6 and displacement sensor probe 7 pass through optical fiber coupling and are connected, data acquisition module 5 includes analog-digital data acquisition chip and peripheral filtering unit, analog input and data output are connected with displacement sensor 6 and centering control module 3 respectively, actuating mechanism includes gasbag 10, air compressor machine 11, vacuum pump 1, admission valve 12 and air outlet valve 2, admission valve 12 one end links to each other with air compressor machine 11, the other end links to each other with the gasbag 10 of shaking table, air outlet valve 2 one end links to each other with the gasbag 10 of shaking table, the other end links to each other with vacuum pump 1, the purpose that air outlet valve 2 links to each other with vacuum pump 1 is to carry out the negative pressure to gasbag 10 and bleed, increasing the dynamic range of the airbag 10. The air bag 10 is arranged below the moving component 9, and the lifting adjustment of the moving component 9 can be realized by inflating and deflating the air bag 10, so that the automatic centering is realized.
A pair of displacement sensors 6 and a displacement sensor probe 7 are adopted in a position information detection module and are connected through an optical fiber, the displacement sensor probe 7 is matched with a trapezoidal black and white strip paper tape 8 for use, the displacement sensor probe 7 measures and amplifies infrared light received through the optical fiber and outputs 0-5V direct current voltage quantity at different heights of the trapezoidal black and white strip paper tape 8 according to the infrared light total reflection principle, the infrared light quantity received by the displacement sensor probe 7 is in direct proportion to the width of a white strip. In order to realize digital automatic centering, the invention uses the data acquisition module 5 to convert the analog quantity output by the displacement sensor 6 into 16-bit unsigned integer digital quantity, and transmits the digital quantity to the centering control module 3 through an SPI bus, the centering control module 3 carries out data format conversion on the received original digital quantity, the central position of the moving part 9 is calculated, the calculation result is brought into an internal automatic centering PID control algorithm, and finally control signals for an air inlet valve and an air outlet valve are output.
The whole operation flow of the design is shown in fig. 3, the position information detection module transmits the position information of the moving part 9 to the centering control module 3, the centering control module 3 performs data format conversion and center position calculation on the position information, and outputs digital signals accurately controlled by the inflation and deflation electromagnetic valves to form a complete closed-loop pneumatic servo control system. The specific control method comprises the following steps:
(1) the system is in an automatic centering mode by default after power-on initialization, and can be switched into a manual centering mode through the touch screen, and in addition, the touch screen can also display the position information of the current moving part 9, the current states of the air inlet valve 12 and the air outlet valve 2, a preset central position value and the like.
(2) And performing data acquisition after the system is electrified and initialized, acquiring analog quantity (DC: 0-5V) output by a position information detection module, and converting unsigned integer data into an actual moving part position value.
(3) The centering control module performs data processing on the same step, and mainly relates to data conversion and digital filtering processing.
(4) And the centering control module calculates the central position of the current moving part, compares the calculated central position with a preset position, and judges that the central position of the current moving part does not deviate when the difference value between the central position and the preset position is less than or equal to a set threshold value, otherwise, judges that the central position of the current moving part deviates.
(5) And when the centering control module judges that the center position of the current moving part deviates, starting an internal automatic centering PID control algorithm, substituting the calculated center position of the current moving part into calculation, and outputting control signals of the air inlet valve 12 and the air release valve 2 to realize automatic centering.
(6) In the manual centering mode, the air inlet valve 12 and the air release valve 2 can be manually controlled through a button on the touch screen, so that the lifting of moving parts of the vibrating table can be conveniently adjusted manually.
In embodiment 2, on the basis of embodiment 1, the centering control module 3 is equipped with a Linux real-time operating system with a reduced kernel.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a digital shaking table moving part automatic centering device, includes trapezoidal black and white strip paper tape (8) and detector, its characterized in that, the detector includes displacement sensor (6) and displacement sensor probe (7), trapezoidal black and white strip paper tape (8) are pasted on moving part (9), displacement sensor (6) and displacement sensor probe (7) pass through optical fiber coupling and are connected, data acquisition module (5) include modulus data acquisition chip and peripheral filtering unit, analog input and data output are connected with displacement sensor (6) and centering control module (3) respectively, actuating mechanism includes gasbag (10), air compressor machine (11), vacuum pump (1), admission valve (12) and air outlet valve (2), admission valve (12) one end links to each other with air compressor machine (11), the other end links to each other with gasbag (10) of shaking table, one end of the air outlet valve (2) is connected with an air bag (10) of the vibration table, the other end of the air outlet valve is connected with the vacuum pump (1), and the air bag (10) is arranged below the moving part (9).
2. The automatic centering device for the moving parts of the digital vibration table according to claim 1, wherein the centering control module (3) is further connected with a touch screen (4).
3. The automatic centering device for the moving part of the digital vibration table as claimed in claim 1, wherein the inflation and deflation of the air bag (10) can adjust the lifting and lowering of the moving part (9).
4. The automatic centering device for the moving part of the digital vibration table as claimed in claim 1, wherein the displacement sensor probe (7) is based on the total reflection principle of infrared light, the quantity of infrared light received by the displacement sensor probe (7) is proportional to the width of white stripes at different heights of the trapezoidal black and white stripe paper tape (8), and the displacement sensor (6) measures and amplifies the infrared light received by the optical fiber and outputs a direct current voltage quantity of 0-5V.
5. The automatic centering device for the moving parts of the digital vibration table according to claim 4, wherein the data acquisition module (5) converts the analog quantity output by the displacement sensor (6) into a digital quantity with 16-bit unsigned integer and transmits the digital quantity to the centering control module (3) through an SPI bus.
6. The automatic centering device for the moving part of the digital vibration table according to claim 5, wherein the centering control module (3) is equipped with a Linux real-time operating system.
7. The automatic centering device of the moving component of the digital vibration table as claimed in claim 6, wherein the centering control module (3) performs data format conversion on the received original digital quantity, calculates the center position of the moving component (9), brings the calculation result into an internal automatic centering PID control algorithm, and finally outputs control signals for the air inlet valve and the air outlet valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110944964.1A CN113721451B (en) | 2021-08-17 | 2021-08-17 | Automatic centering device for moving part of digital vibrating table |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110944964.1A CN113721451B (en) | 2021-08-17 | 2021-08-17 | Automatic centering device for moving part of digital vibrating table |
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| CN113721451A true CN113721451A (en) | 2021-11-30 |
| CN113721451B CN113721451B (en) | 2024-06-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114382824A (en) * | 2021-12-22 | 2022-04-22 | 北京航天希尔测试技术有限公司 | High-variation overload resistant vibration table moving part position balancing system |
| CN116147869A (en) * | 2023-02-27 | 2023-05-23 | 苏州东菱振动试验仪器有限公司 | Coupling device and vertical four-integration system |
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2021
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Patent Citations (3)
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| CN201107659Y (en) * | 2007-11-23 | 2008-08-27 | 北京强度环境研究所 | Oscillating table moving component self-centering apparatus |
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| 贾子永: "基于梯形棋盘格的摄像机和激光雷达标定方法", 《计算机应用》, 31 July 2017 (2017-07-31), pages 2062 - 2066 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114382824A (en) * | 2021-12-22 | 2022-04-22 | 北京航天希尔测试技术有限公司 | High-variation overload resistant vibration table moving part position balancing system |
| CN114382824B (en) * | 2021-12-22 | 2024-02-20 | 北京航天希尔测试技术有限公司 | Vibration table moving part position balancing system for resisting high-speed change overload |
| CN116147869A (en) * | 2023-02-27 | 2023-05-23 | 苏州东菱振动试验仪器有限公司 | Coupling device and vertical four-integration system |
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