CN104931817A - Board for collecting frequency characteristic testing data of electro-hydraulic servo valve based on ARM - Google Patents
Board for collecting frequency characteristic testing data of electro-hydraulic servo valve based on ARM Download PDFInfo
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- CN104931817A CN104931817A CN201510291927.XA CN201510291927A CN104931817A CN 104931817 A CN104931817 A CN 104931817A CN 201510291927 A CN201510291927 A CN 201510291927A CN 104931817 A CN104931817 A CN 104931817A
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Abstract
The invention discloses a board for collecting the frequency characteristic testing data of an electro-hydraulic servo valve based on an ARM, and the board comprises a CPU, an AD9833, an AD5160, a DC isolation circuit, an SPA bus, and an AD7323. The board is characterized in that the SPA bus is connected with the CPU, the AD9833, the AD5160 and the AD7323; the tail end of the AD5160 is connected with the DC isolation circuit; the DC isolation circuit is connected with the AD7323 through a channel 0, and is also connected with a tested object; and the tail end of the tested object is connected with the AD7323 through a channel 1. The objective of the invention is to applying a sinusoidal signal with the set frequency and amplitude to a tested servo valve, to collect output signals of a sensor for dynamically measuring a speed of a cylinder and a displacement sensor, and to achieve the communication between data and an upper computer through a serial port.
Description
Technical field
The present invention relates to data acquisition board, particularly relate to a kind of based on ARM electrohydraulic servo valve frequency characteristic test secretary collection plate.
Technical background:
Electrohydraulic Servo Valve Characteristics tester is the most important ingredient of traditional electrohydraulic servo valve frequency characteristic test device, and it adopts discrete simulation electronic original paper fixture designs, and has professional enterprise to manufacture sale.Traditional tester volume is heavy greatly, complicated operation, and maintenance not easily.Universal and the development of height along with modern times untreated technology and computer technology, researching and developing with untreated is the flat rate characteristic test system of electrohydraulic servo valve of core, and the flat rate characteristic tester replacing traditional analog is very necessary.Summary of the invention
the object of the invention is to apply the sinusoidal signal of setpoint frequency and setting amplitude, the output signal gathering kinetic measurement speed pickup and displacement transducer, data by serial ports and the communication of host computer reality to tested servo-valve.
For realizing above object, the technical solution used in the present invention is: a kind of based on electrohydraulic servo valve flat rate characteristic test data acquisition board, it comprises CPU, AD9833, AD5160, block isolating circuit, SPA bus AD7323; It is characterized in that: described SPA bus connects CPU, AD9833, AD5160 and AD7323 respectively; Described AD5160 end is connected with block isolating circuit, and block isolating circuit connects AD7323 by passage 0, and block isolating circuit connects measurand; Measurand end connects AD7323. by passage 1
In the present invention, described CPU adopts the LPC2132. of NXP
Beneficial effect of the present invention: the present invention is based on ARM electrohydraulic servo valve flat rate characteristic test data acquisition board and there is several aspect notable feature below:
1, adopt the LPC2132 ARM7 of NXP as system core CPU, with the chip communication such as AD9833, AD5160, AD7323, realize exchanges data
2, AD9833 produces flat rate and the adjustable sine wave signal of amplitude, and signal stabilization precision is high, and power consumption is little.
3, digital regulation resistance AD5160 realizes the amplitude adjustment of sine wave signal, and amplitude arranges and regulates accurately conveniently.
4, selected the very ambipolar ADC converter of AD7323 to carry out secretary's collection, sample rate is fast, and real-time is good.
5, the data gathered are read in LPC2132 timing from AD7323 by SPI interface, and send to upper computing machine by serial ports.
The present invention is to be successfully applied in the flat rate communications device of electrohydraulic servo valve.Cases of engineering proves, stable work in work of the present invention, data are accurate reliably, lightweight is little, easy to use.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram
Embodiment
Based on the electrohydraulic servo valve frequency characteristic test proving installation of the sensor externally positioned type dynamic test cylinder integrated use formation complete set that ARM electrohydraulic servo valve frequency characteristic test data acquisition board and our company are researched and developed.The present invention's multistep advocate approach measures the frequency characteristic of electrohydraulic servo valve.The ultimate principle of the method is the sinusoidal signal applying certain frequency and certain magnitude excitation to servo-valve, and response signal one delivery rate of servo-valve is also the sine of a same frequency, but its amplitude is different with phase place; In the frequency range of the frequency of test, select several frequency test points; In each test point, put on tested valve with the sine of certain frequency and amplitude and encourage, and gather the response signal of measurand simultaneously, calculate the good Amplitude Ration of conscience under different frequency and phase place ratio, the frequency response characteristic of tested valve can be obtained.
As shown in Figure 1, the present invention adopts the LPC2132 ARM7 of NXP as system core CPU, uses AD9833 to produce the sine wave signal of frequency-adjustable, uses the amplitude of AD5160 offset of sinusoidal ripple signal to regulate.And to one's duty of sampling, because the sinusoidal amplitude of system requirements is at-5V ~+5V, therefore, selected the very ambipolar ADC of AD7323 to summon device to court and carried out data sampling.
Sinusoidal wave generation; AD9833 is a low-power consumption, programmable waveform generator, can carry out programming regulate by SPI interface to the frequency of the waveform exported and phase place.AD9833 is when dominant frequency clock is 25MHz, and precision is 0.1Hz; When dominant frequency clock is 1MHz, precision can reach 0.004Hz.AD9833 reference frequency output is the operating voltage range of 0MHz ~ 12.5MHz is 2.3V ~ 5.5V, and is that power consumption is only 20mW. at 3V
Amplitude controls: AD5160 has 256 plugs, and resistance value has 5K.10K, 50K, 100K tetra-kinds of specifications.Its operating voltage range is controlled it by spi bus at 2.7V ~ 5.5V, CPU.
Data acquisition: because the sinusoidal amplitude of system requirements is at-5V ~+5V, therefore the very ambipolar ADC converter of AD7323 carries out secretary's sampling, and AD7323 is the SAR ADC of a 4 passages, 12 bit strip sign bits.This ADC is furnished with a high speed SPI interface,
Circuit block diagram of the present invention as shown in Figure 1.First the sine wave signal of frequency-adjustable is produced by LPC2132 ARM CPU control AD9833.The sine wave signal peak-to-peak value that AD9833 produces is 1V.The sine wave signal input AD5160 of AD9833.AD5160 is a controlled digital regulation resistance.LPC2132 is controlled by AD5160 during spi bus, and carry out dividing potential drop to the signal that AD9833 produces, the sine wave signal that AD9833 is produced is after carrying out AD5160, and its peak-to-peak value can change between 0V ~ 1V.
The signal that AD5160 exports reaches 0 ~ 10V after amplifier carries out copying amplification, finally carry out block isolating circuit, that output signal is between-5V ~+5V, by passage 0, signal transmission is passed through measurand to AD7323. pumping signal, thus becoming response signal, response signal connects AD7323 by passage 1.AD7323 records the sine wave signal of sensor simultaneously, and the signal that sensor exports gathers.LPC2132 again timing reads the data gathered from AD7323 by SPI interface, and send to computing machine by serial ports.
Claims (2)
1., based on an ARM electrohydraulic servo valve frequency characteristic test data acquisition board, it comprises CPU, AD9833, AD5160 block isolating circuit, SPA bus, AD7323; It is characterized in that: described SPA bus connects CPU, AD9833, AD5160 and AD7323 respectively; Described AD5160 end is connected with block isolating circuit, and respective circuit connects AD7323 by passage 0, and block isolating circuit connects measurand, and measurand end connects AD7323 by passage 1.
2. one according to claim 1 is based on ARM electro-hydraulic servo frequency characteristic test data acquisition board, and its feature is adopting the LPC2132 of NXP with described CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510291927.XA CN104931817A (en) | 2015-06-01 | 2015-06-01 | Board for collecting frequency characteristic testing data of electro-hydraulic servo valve based on ARM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510291927.XA CN104931817A (en) | 2015-06-01 | 2015-06-01 | Board for collecting frequency characteristic testing data of electro-hydraulic servo valve based on ARM |
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| CN104931817A true CN104931817A (en) | 2015-09-23 |
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| CN201510291927.XA Pending CN104931817A (en) | 2015-06-01 | 2015-06-01 | Board for collecting frequency characteristic testing data of electro-hydraulic servo valve based on ARM |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041779A (en) * | 2015-06-12 | 2015-11-11 | 合肥市徽腾网络科技有限公司 | Frequency characteristic test data acquisition board based on ARM electro-hydraulic servo valve |
| CN105067913A (en) * | 2015-07-23 | 2015-11-18 | 合肥扬帆通信元器件有限公司 | ARM-based electro-hydraulic servo valve frequency characteristic test data acquisition plate |
| CN105067920A (en) * | 2015-08-04 | 2015-11-18 | 安徽中杰信息科技有限公司 | ARM electro-hydraulic servo valve frequency characteristic test based data acquisition board |
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| CN102608420A (en) * | 2012-03-10 | 2012-07-25 | 湖南睿创宇航科技有限公司 | ARM-based electro-hydraulic servo valve frequency characteristic test data acquisition board |
| CN202583321U (en) * | 2012-03-10 | 2012-12-05 | 湖南睿创宇航科技有限公司 | Data acquisition board based on frequency characteristic test of ARM electro-hydraulic servo valve |
| CN103104573A (en) * | 2013-03-11 | 2013-05-15 | 武汉科技大学 | Device and method for testing high-frequency on-load frequency catachrestic of large-size hydraulic cylinder |
| CN105090170A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Data collecting board based on ARM electro-hydraulic servo valve frequency characteristic test |
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2015
- 2015-06-01 CN CN201510291927.XA patent/CN104931817A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608420A (en) * | 2012-03-10 | 2012-07-25 | 湖南睿创宇航科技有限公司 | ARM-based electro-hydraulic servo valve frequency characteristic test data acquisition board |
| CN202583321U (en) * | 2012-03-10 | 2012-12-05 | 湖南睿创宇航科技有限公司 | Data acquisition board based on frequency characteristic test of ARM electro-hydraulic servo valve |
| CN103104573A (en) * | 2013-03-11 | 2013-05-15 | 武汉科技大学 | Device and method for testing high-frequency on-load frequency catachrestic of large-size hydraulic cylinder |
| CN105090170A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Data collecting board based on ARM electro-hydraulic servo valve frequency characteristic test |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041779A (en) * | 2015-06-12 | 2015-11-11 | 合肥市徽腾网络科技有限公司 | Frequency characteristic test data acquisition board based on ARM electro-hydraulic servo valve |
| CN105067913A (en) * | 2015-07-23 | 2015-11-18 | 合肥扬帆通信元器件有限公司 | ARM-based electro-hydraulic servo valve frequency characteristic test data acquisition plate |
| CN105067920A (en) * | 2015-08-04 | 2015-11-18 | 安徽中杰信息科技有限公司 | ARM electro-hydraulic servo valve frequency characteristic test based data acquisition board |
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Application publication date: 20150923 |