CN106199240A - A kind of based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board - Google Patents
A kind of based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board Download PDFInfo
- Publication number
- CN106199240A CN106199240A CN201610473322.7A CN201610473322A CN106199240A CN 106199240 A CN106199240 A CN 106199240A CN 201610473322 A CN201610473322 A CN 201610473322A CN 106199240 A CN106199240 A CN 106199240A
- Authority
- CN
- China
- Prior art keywords
- servo valve
- data acquisition
- characteristic test
- isolating circuit
- frequency characteristic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a kind of based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board, it includes CPU, AD9833, AD5160, block isolating circuit, SPA bus, AD7323；It is characterized in that: in described SPA bus, connect CPU, AD9833, AD5160 and AD7323 respectively；Described AD5160 end connects 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.It is an object of the invention to that tested servo valve is applied setpoint frequency and the sinusoidal signal setting amplitude, collection kinetic measurement cylinder velocity sensor and the output signal of displacement transducer, data realize communication by serial ports and host computer.
Description
Technical field
The present invention relates to data acquisition board, particularly relate to one and adopt based on ARM electrohydraulic servo valve frequency characteristic test secretary
Collection plate.
Technical background
Electrohydraulic Servo Valve Characteristics tester is the most important composition of traditional electrohydraulic servo valve frequency characteristic test device
Part, it uses discrete simulation electronic original paper fixture designs, and has professional enterprise to manufacture sale.Traditional tester volume is big and stupid
Weight, operation complexity, maintenance is difficult to.Along with modern untreated technology and the highly popular and development of computer technology, research and development are not with
Being processed as the electrohydraulic servo valve flat rate characteristic test system of core, the flat rate characteristic tester replacing traditional analog is the most necessary
's.
Summary of the invention
It is an object of the invention to tested servo valve apply setpoint frequency and the sinusoidal signal setting amplitude, gathers dynamically
Measuring speed sensor and the output signal of displacement transducer, data are by serial ports and host computer reality communication.
For realizing object above, 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 includes CPU, AD9833, AD5160, block isolating circuit, SPA bus AD7323；It is characterized in that: described SPA
CPU, AD9833, AD5160 and AD7323 is connected respectively in bus；Described AD5160 end connects block isolating circuit, every straight electricity
Road connects AD7323 by passage 0, and block isolating circuit connects measurand；Measurand end connects AD7323 by passage 1.
In the present invention, described CPU uses the LPC2132 of NXP.
Beneficial effects of the present invention: the present invention is below based on ARM electrohydraulic servo valve flat rate characteristic test data acquisition board
Several aspects have a marked feature:
1, use the LPC2132 ARM7 of NXP as system core CPU, and the chip communication such as AD9833, AD5160, AD7323,
Realize data exchange；
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 regulation of sine wave signal, and it is the most convenient that amplitude arranges regulation；
4, having selected AD7323 the most ambipolar ADC transducer to carry out secretary's collection, sample rate is fast, and real-time is good；
5, the data gathered are read in LPC2132 timing by SPI interface from AD7323, and are sent to upper calculating by serial ports
Machine.
The present invention is to be successfully applied in electrohydraulic servo valve flat rate communications device.Cases of engineering proves, the present invention
Stable work in work, data accurately reliable, lightweight is little, easy to use.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram.
Detailed description of the invention
The sensor externally positioned type researched and developed based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board and our company is dynamic
The test integrated use of cylinder constitutes the electrohydraulic servo valve frequency characteristic test test device of complete set.One multistep excitation of the present invention
Method measures the frequency characteristic of electrohydraulic servo valve.The ultimate principle of the method is to swash to servo valve applying certain frequency and certain amplitude
The sinusoidal signal encouraged, response signal one output flow of servo valve is also the sine of a same frequency, but its amplitude and phase place
Different；In the frequency range of the frequency of test, select several frequency test points；In each test point, with certain frequency and
The sine of amplitude puts on tested valve and encourages, and gathers the response signal of measurand simultaneously, calculates under different frequency
Amplitude Ration that conscience is good and phase place ratio, can obtain the frequency response characteristic of tested valve.
As it is shown in figure 1, the present invention uses the LPC2132 ARM7 of NXP as system core CPU, AD9833 is used to produce
The sine wave signal of frequency-adjustable, uses AD5160 to be adjusted the amplitude of sine wave signal.And to one's duty of sampling, due to
The sinusoidal amplitude of system requirements is at-5V ~+5V, therefore, has selected the most ambipolar ADC of AD7323 to summon device to court and has carried out data acquisition
Sample.
Sinusoidal wave generation;AD9833 is a low-power consumption, programmable waveform generator, can be to output by SPI interface
The frequency of waveform and phase place are programmed regulation.AD9833 is when dominant frequency clock is 25MHz, and precision is 0.1Hz；At dominant frequency clock
During for 1MHz, precision can reach 0.004Hz.AD9833 reference frequency output is that the operating voltage range of 0MHz ~ 12.5MHz is
2.3V ~ 5.5V, and be that power consumption is only 20mW at 3V.
Amplitude controls: AD5160 has 256 plugs, and resistance value has 5K.10K, tetra-kinds of specifications of 50K, 100K.Its running voltage model
It is trapped among 2.7V ~ 5.5V, CPU to be controlled it by spi bus.
Data acquisition: owing to the sinusoidal amplitude of system requirements is at-5V ~+5V, therefore the most ambipolar ADC of AD7323 turns
Parallel operation carries out secretary's sampling, and AD7323 is a 4 passages, the SAR ADC of 12 bit strip sign bits.This ADC is furnished with one
High speed SPI interface.
The circuit block diagram of the present invention is as shown in Figure 1.First controlled AD9833 by LPC2132 ARM CPU to produce
The sine wave signal of raw frequency-adjustable.The sine wave signal peak-to-peak value that AD9833 produces is 1V.The sine wave signal of AD9833 is defeated
Enter AD5160.AD5160 is a controlled digital regulation resistance.LPC2132 is controlled by AD5160 during spi bus, right
The signal that AD9833 produces carries out dividing potential drop so that the sine wave signal that AD9833 produces is after carrying out AD5160, and its peak-to-peak value can
It is changed between 0V ~ 1V.
The signal of AD5160 output reaches 0 ~ 10V after amplifier carries out replicating and amplifies, and finally carries out block isolating circuit, is defeated
Go out signal between-5V ~+5V, be delivered to AD7323. pumping signal by measurand by 0 signal of passage, thus become
Response signal, response signal connects AD7323 by passage 1.AD7323 records the sine wave signal of sensor, Yi Jichuan simultaneously
The signal of sensor output is acquired.The data gathered are read in LPC2132 timing again by SPI interface from AD7323, and pass through
Serial ports is sent to computer.
Claims (2)
1., based on an ARM electrohydraulic servo valve frequency characteristic test data acquisition board, it includes that CPU, AD9833, AD5160 are every directly
Circuit, SPA bus, AD7323；It is characterized in that: connect respectively in described SPA bus CPU, AD9833, AD5160 and
AD7323；Described AD5160 end connects block isolating circuit, and respective circuit connects AD7323 by passage 0, and block isolating circuit is even
Connecing measurand, measurand end connects AD7323 by passage 1.
One the most according to claim 1 based on ARM electro-hydraulic servo frequency characteristic test data acquisition board, its feature with
Described CPU uses the LPC2132 of NXP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610473322.7A CN106199240A (en) | 2016-06-26 | 2016-06-26 | A kind of based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610473322.7A CN106199240A (en) | 2016-06-26 | 2016-06-26 | A kind of based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106199240A true CN106199240A (en) | 2016-12-07 |
Family
ID=57461012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610473322.7A Withdrawn CN106199240A (en) | 2016-06-26 | 2016-06-26 | A kind of based on ARM electrohydraulic servo valve frequency characteristic test data acquisition board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106199240A (en) |
-
2016
- 2016-06-26 CN CN201610473322.7A patent/CN106199240A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20161207 |
|
| WW01 | Invention patent application withdrawn after publication |