CN104454790A - Electro-hydraulic servo valve performance test system - Google Patents

Abstract

The invention belongs to an electro-hydraulic servo valve test technology and discloses an electro-hydraulic servo valve performance test system. The electro-hydraulic servo valve performance test system is characterized in that when the performance of a servo valve is tested, a control module is used for controlling the power-on/off of an electromagnetic valve combination according to the test requirements so as to achieve the purpose of automatically switching a test state (flow rate, pressure, internal leakage and the like); a test module is used for sending out a test signal through an acquisition card according to the setup of a software part and conditioning a sensor signal (current, pressure, flow rate, temperature, liquid level and the like), and the acquisition card is used for synchronously converting the conditioned sensor signal into a digital signal through hardware; finally, the software part is used for filtering and fitting acquired data, calculating various performance parameters of the servo valve and drawing a performance curve, and a test report is printed. As the conversion of the test state is a very complicated operation process in the servo valve performance test process, the automatic conversion of the complicated operation process is realized by the electro-hydraulic servo valve performance test system, so that the operation process is simplified, the test efficiency is improved, and meanwhile, effects of human factors are reduced.

Description

A kind of electrohydraulic control Performance Test System

Technical field

This patent belongs to electrohydraulic control technical field of measurement and test, relates to a kind of electrohydraulic control Performance Test System of the test mode that can automatically switch, and is mainly used in the producer of servovalve manufacturer or high frequency use servovalve.

Background technique

Electrohydraulic control is the important control unit in electrohydraulic servo-controlling system, play a part the conversion of electric liquid and power amplification in systems in which, electrohydraulic control combines precision optical machinery, electronic technology and hydraulics, have that control accuracy is high, fast response time, signal transacting flexibly, compact structure, power amplification coefficient power amplification ratio be high with the advantage such as output linearity degree is good, is widely used in the major domains such as metallurgical machinery, Aero-Space, naval vessel and weapon industry.The performance of electrohydraulic control determines the quality of electrohydraulic servo-controlling system, and the performance of therefore quick and precisely testing electrohydraulic control just seems particularly important.

Current a lot of electrohydraulic control is produced and is used producer still to adopt traditional manual test, utilizes low frequency generator, recorder, frequency characteristic analyzer etc. to realize test.Tester is according to the difference of surveyed performance, and manually the on off state of each stop valve upper of adjustment test system carrys out switch test state.Then, adjustment test signal, performance curve is drawn out by recorder, thus obtains servovalve performance parameter.Manual test system testing cost is high, complicated operation, very high to the requirement of tester's technical ability, and be affected by human factors large during test, test accuracy is poor.Can not meet the requirement to Testing Performances of Hydraulic Servo Valve.

Along with the development of electronic technology, CAT technology is also thereupon fast-developing and constantly perfect, and it is also more and more faster at the application paces in electrohydraulic control testing property field.So-called CAT technology, combines computer with common test system (first and second instrument) exactly, makes full use of that Computer Storage amount is large, the advantage of fast operation, the various data processing functions in adopting various functional software bag to realize testing.Use suitable peripheral board simultaneously, realize the function of such as signal generator, Frequency tester, proportional valve controller, solenoid valve controller and recorder, through designing the needs that can reach servovalve performance full-automatic testing completely.

Summary of the invention

Object of the present invention: the electrohydraulic control Performance Test System designing a kind of test mode that can automatically switch.Reach the object of electrohydraulic control all properties full-automatic testing.Improve testing precision and the efficiency of electrohydraulic control, reduce the operation easier of tester, avoid introducing personal error.

Technological scheme of the present invention: a kind of electrohydraulic control Performance Test System, mainly comprises pumping plant, testboard bay, Testing Performances of Hydraulic Servo Valve instrument, computer, capture card, pressure, flow, temperature, liquid level sensor; It is characterized in that: also comprise an automatic switching control equipment, Testing Performances of Hydraulic Servo Valve instrument is by automatic switching control equipment automatic switchover Testing Performances of Hydraulic Servo Valve state, test signal is transferred to Testing Performances of Hydraulic Servo Valve instrument by capture card, measuring current is applied to tested servovalve after test signal is carried out the process such as power amplification by Testing Performances of Hydraulic Servo Valve instrument, servovalve works, Testing Performances of Hydraulic Servo Valve instrument conditioning sensor signal, capture card sensor signal will convert digital signal to by hardware synchronization after conditioning; Last test software by image data after filtering, matching, calculate servovalve various performance parameters, and draw out respective performances curve, printing test is reported; Various states in simultaneous computer Real-Time Monitoring test system, and can under the fault state of some specific setting autostop, to guarantee the safe and reliable of whole test system;

Testing Performances of Hydraulic Servo Valve instrument comprises D.C. regulated power supply, signal conditioning circuit; D.C. regulated power supply provides DC electrical source, on testboard bay, the solenoid valve group of switch test state provides operating current to survey Testing Performances of Hydraulic Servo Valve instrument conditioning circuit; Signal conditioning circuit has hardware filtering, plus and minus calculation function, signal amplification is followed, V/I changes, constant-current circuit function;

Capture card is 16 NI6229 data collecting cards, and capture card gathers data, converts analogue signal to digital signal and by bus transfer to computer; Capture card sets by I/O mouth as the automatic switching control equipment of servovalve static test inside provides command signal according to testing software, test automatic switching control equipment automatic switchover test system and test state.

The each performance characteristic parameter calculating electrohydraulic control solves multinomial algorithm by least square fitting algorithm and Newton iteration and realizes.During test servovalve dynamic performance, when carrying out FFT conversion to the rate signal of dynamic actuator, with the addition of Hanning window to the rate signal blocked, the spectrum reducing rate signal is leaked.

The electrohydraulic control dynamic and static measurement software operation step of the present invention's exploitation is as follows: open testing software, testing software parameters input interface inputs the call parameter (rated pressure, rated current, rated flow etc.) of tested electrohydraulic control, then required characteristic test (flow, pressure, interior leakage etc.) is clicked, after starting test, test system can according to the characteristic test selected, automatic switchover test mode, complete all by the characteristic test selected, calculate special parameter, and draw out corresponding test curve, printing test is reported.

Beneficial effect of the present invention: the invention solves traditional electrical hydraulic servo testing property Problems existing, full-automatic testing electrohydraulic control all properties.Improve testing precision and the efficiency of electrohydraulic control, reduce the operation easier of tester, avoid introducing personal error.

Accompanying drawing illustrates:

Fig. 1 is the principle assumption diagram of present system;

Fig. 2 is the schematic diagram of conditioning circuit in Testing Performances of Hydraulic Servo Valve instrument of the present invention;

Fig. 3,4,5 is the operational flowchart of testing software of the present invention;

Embodiment

Below in conjunction with Figure of description and example, the present invention is described in further detail.

As shown in Figure 1, according to the test request of user, test mode COMM communication automatic switchover current test state, computer generates test signal automatically, analog test signal is generated after being changed by capture card D/A, analogue signal generates test current signals after Testing Performances of Hydraulic Servo Valve instrument power drive, current signal drives servovalve work, various sensor (electric current, pressure, flow, temperature, liquid level etc.) by the physical quantity switching current signal of various test needs, sensor current signal is nursed one's health into standard voltage signal by Testing Performances of Hydraulic Servo Valve instrument, standard voltage signal collected card A/D generates digital signal after changing, digital signal has passed again computer back by bus.Testing software after filtering, matching, calculate servovalve various performance parameters, and draw out corresponding performance curve, printing test is reported.

As shown in Figure 2, hardware conditioning circuit there is V/I, hardware second-order low-pass filter, signal amplify follow, the function such as plus and minus calculation.4-20mA standard current signal is not easy to be subject to external interference, can long range propagation unattenuated, be applicable to very much the transmission form being used as sensor signal, but current signal can not directly by computer acquisition, by the highi degree of accuracy 250 Ω wire-wound sampling resistor of hardware conditioning circuit, change the voltage signal of 1-5V into.The HF noise signal comprised in primary signal is eliminated in the effect of hardware second-order low-pass filter, prevent from during test, causing signal amplitude to decay and delayed phase, it is that the voltage signal of 1-5V is amplified the normal voltage being converted to 0-lOV that signal amplifies the effect of following, and other circuit has an impact to conditioning circuit when preventing conditioning circuit to be connected in test system, the stability of raising system and interference free performance, the effect of plus and minus calculation is subtracted each other by the pressure signal of the pressure signal of load cavity 1 and load cavity 2, generate pressure difference signal required when servovalve Pressure characteristics is tested.

As shown in Fig. 3,4,5, servo valve testing system operation can be divided into two major parts: static test and dynamic test.Selection enters static test interface, and the effect of " systems axiol-ogy " is that before test, whether the whole test system work of detection is normal; The effect of " setting parameter " is the performance index arranging tested servovalve; The effect of " test is selected " is the performance test selecting to do; The effect of " criterion setting " is the standard that setting servovalve performance parameter is qualified; The effect of " fault setting " is the physical quantity numerical value of setting malfunction alarm; The effect of " record queries " is the test record of inquiry servovalve.When starting to test, test system is according to " setting parameter " setting with " test and select ", and automatic switchover test mode, completes required testing property automatically, and makes corresponding judgement and action according to " criterion setting ", " fault setting ".Selection enters dynamic test interface, after " optimum configurations ", clicks the dynamic performance testing that " starting to test " just can complete servovalve automatically; The effect of " coordinate setting " is that the coordinate of test result is shown as ordinary straight angle coordinate system or Logarithm coordinates system.

Claims (1)

1. an electrohydraulic control Performance Test System, mainly comprises pumping plant, testboard bay, Testing Performances of Hydraulic Servo Valve instrument, computer, capture card, pressure, flow, temperature, liquid level sensor; It is characterized in that: also comprise an automatic switching control equipment, Testing Performances of Hydraulic Servo Valve instrument is by automatic switching control equipment automatic switchover Testing Performances of Hydraulic Servo Valve state, test signal is transferred to Testing Performances of Hydraulic Servo Valve instrument by capture card, measuring current is applied to tested servovalve after test signal is carried out the process such as power amplification by Testing Performances of Hydraulic Servo Valve instrument, servovalve works, Testing Performances of Hydraulic Servo Valve instrument conditioning sensor signal, capture card sensor signal will convert digital signal to by hardware synchronization after conditioning; Last test software by image data after filtering, matching, calculate servovalve various performance parameters, and draw out respective performances curve, printing test is reported; Various states in simultaneous computer Real-Time Monitoring test system, and can under the fault state of some specific setting autostop, to guarantee the safe and reliable of whole test system;

Testing Performances of Hydraulic Servo Valve instrument comprises D.C. regulated power supply, signal conditioning circuit; D.C. regulated power supply provides DC electrical source, on testboard bay, the solenoid valve group of switch test state provides operating current to survey Testing Performances of Hydraulic Servo Valve instrument conditioning circuit; Signal conditioning circuit has hardware filtering, plus and minus calculation function, signal amplification is followed, V/I changes, constant-current circuit function;

Capture card is 16 NI6229 data collecting cards, and capture card gathers data, converts analogue signal to digital signal and by bus transfer to computer; Capture card sets by I/O mouth as the automatic switching control equipment of servovalve static test inside provides command signal according to testing software, test automatic switching control equipment automatic switchover test system and test state.