【正文】 and so on,servo valve will malfunction inevitably and need repairs after using a certain maintenance and repair,we must detect the servo valve through some certain testing methods of dynamic and static to decide whether its various properties meet the stipulated requirements or not. Thus,large enterprises establish independent servo valve testbed according to the own is described below is a servo valve testbed developed jointly by our unit and a university and the testbed is based on puteraided testing. 2 pump station Hydraulic pump station also known as the pump station is an independent hydraulic device. It offers oil according to the requirements gradually and controlls the direction, pressure and flow rate of hydraulic oil, applied to the mainframe and hydraulic devices separability of hydraulic machinery. After the purchase users just connect hydraulic station and host of implementing agencies (motor oil or fuel tanks) with tubing, and hydraulic machinery can be realize these movements and the work cycle. Hydraulic pump station consists of pump device, block or valve, tanks, a bination of electrical function of each ponents are as follows: (1)Pump device is equipped with motors and pumps, is the source of power of the hydraulic station. It changes mechanical energy into hydraulic oil pressure energy. (2)Integration block is assembled by hydraulic valve and channel body. It can adjust the direction, pressure and flow of the hydraulic oil. (3)Valve portfolio plate valve is installed in the board and channels connect with each other after the board witch is the same as integration valve. (4)Tank plate is a welding semiclosed container, and also located with oil filtering work and air filters used for oil, oil filters and cooling. (5)Electrical boxes have two patterns. One designs external fuse terminal plate。 △ PL =f (177。 關鍵詞 ： 伺服閥 ,試驗臺 ,CAT，動靜態(tài)特性 電液伺服閥是測控系統(tǒng)中常用的測控軟件，由于液壓伺服系統(tǒng)在冶金、工程機械、化工等行業(yè)中的廣泛應用，使伺服閥也大量的被應用在這些行業(yè)中。各部件的功能為： (1)泵裝置 上裝有電機和油泵，是液壓站的動力源，將機械能轉化為液壓油的壓力能。 實驗臺可以完成伺服閥的動靜態(tài)特性測試：靜態(tài)特性測試的內容包括空載流量特性、壓力增益特性、流量 壓力特性、匯漏特性；動態(tài)特性主要是伺服閥頻率特性的測試。i)△ pL=0。 壓力特性測試方法 測試時先將開關閥 1 1 7 都關閉，打開閥 9，使被試閥的輸出流量為零，然后調節(jié)溢流閥 3 使系統(tǒng)壓力等于被試閥的額定壓力與回油壓力（由壓力傳感器 13 測得）之和。 動態(tài)特性測試 根據(jù)國際 ，電流伺服閥的動態(tài)特性測試主要是指其幅頻特性曲線 3dB 時的幅頻寬和相 17 頻特性曲線 90176。 以上信號中的被試閥伺服放大信號為電流信號，其他信號為電壓信號。 信號處理模塊是測試系統(tǒng)最重要的模塊，其子模塊包括數(shù)字濾 波、曲線擬合及差值、頻響計算、誤差補償?shù)取? 19 表一是 MOOG 公司生產的 D072386 伺服閥經維修 后的檢測生成的實驗報告，報告中列出了伺服閥的主要實驗項目結果和標準規(guī)定的值，測試結果的相關曲線，在此不再一一列舉。 通訊模塊的功能包括讀寫輸入 /輸出數(shù)據(jù)緩沖區(qū)、數(shù)字信號發(fā)生器相互通訊模塊。在動態(tài)特性測試時，同時將生成的波形信號數(shù)據(jù)傳送給主機，供計算機動態(tài)特性使用。 動態(tài)特性測試時先將開關閥 6 關閉，將閥 8 打開，由獨立的信號發(fā)生器產生 掃頻正弦信號，經放大之后，輸入到伺服放大器，使動態(tài)缸產生運動，根據(jù)安裝在動態(tài)缸上的速度傳感器，可以求出被試伺服閥的輸出流量?！?pL=f(177。測試時，先調節(jié)溢流閥 3，使系統(tǒng)的壓力為被試電液伺服閥的額定壓力，再向被試閥線圈輸入頻率 為 的三角波電流信號，然后通過控制比例溢流閥 22 使負載壓力從零按一定增量逐漸變化到額定壓力，測量每一增量下的流量，輸入到計算機中。 空載流量特性測試方法 16 測試空載流量特性時，其操作如下：先將開關閥 1 7 關閉，打開閥 1 9，使被試電液伺服閥的兩輸出口 A、 B 之間的壓差 △ PL=0。 (4)油箱 板焊的半封閉容器，上還裝有濾油網(wǎng)、空氣濾清器等，用來儲油、油的冷卻及過濾。它按逐級要求供油。Ta ble 1 electro hudr au li c serv o val ve test bednam eelect rohydra ul ic servo val veRated fl owRat ed inputexperiment d at eTest stan da rdModel and spec if ic at io nnumbe r ponent sRated pre ss uredeliver sampl e uni tmainte nance uni teconnec tion m odeXX thermal powe r pl an tXX hydraul ic cent er 01020304ML/min%Betwe en A and BBetwe en A and B200 177。 q = f (177。 i) △ pL = 0. And according to the measured data ,we can calculate valve flowgain, symmetry, zerodrift and hysteresis and other important properties of the valve. Test method of loadflow characteristics The operations of the test on loadflow characteristics are as follows: First, open switch valve 18 and 9, close the valves 17 and 7, make sure the oil of port A and B flows through the oneway valve 23 and proportional relief valve 22. Proportional relief valve (minimum moderating pressure ) can change the load pressure during the test,and the turbine flowmeter 16 can measure the flow under a variety of load operating conditions. To start the test,we should adjust the relief valve 3, make sure the pressure of the system is the same as the rated pressure of the electrohydraulic servo valve to be input the valve coil 6 being tested with a trianglewave current signal of ,and