【正文】 1 Study on Computer Assistant Test System of ServoValve Testbed Abstract： According to the need of the static and dynamic characteristics ofthe test on servo valve , firstly this article introduces the necessary part of the systemthe pump station. Next, it designs the corresponding hydraulic and puteraided test system and given the position of software and hardware of the test system and the design process of the end,we apply the designed system to actual production to prove that it achieve the requirements of the test on servo valve. Key words： servo valve, test rig, CAT, dynamic and static characteristics 1. Introduction Electrohydraulic servo valve is the frequentlyused control ponent in measurement and control system. Due to the wide use of electrohydraulic servo system in metallurgy, engineering machinery, and chemical industry, a large number of servo valves are also be applied in these by the facters of environmental， abrasion,aging 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。 The other installs a full range of electrical control. Hydraulic station principle: motor driven pump rotation, and pump absorbs 3 oil from the oil tank and changes mechanical energy into hydraulic pressure energy of the station. Hydraulic oil through manifold (or valve binations) realizes the adjusting of direction, pressure, flow .Then through external pipe to the cylinder hydraulic machinery or motor, so as to realize the changing of the direction , the size of the force and the velocity, to promote the machinery working of all kinds. 3. Hydraulic testing system and testing methods Testbed can plete the test on static and dynamic characteristics of servo characteristics of the test includes characteristics of unloaded flow, characteristics of pressuregain, characteristics of flowpressure and characteristics of leakage。 dynamic characteristics are mainly the test on frequency characteristics of servo valve. The above testing results of characteristics need to be drawn out in the way of graph. Figure 1 is a schematic diagram of hydraulic test system. 4 34568111219 2021 er colat or raulic pum p rf lowvalve nergy accum ulator 5 16 .tu rbineflo wmeter 69 17 off valve tatictes ting po s iti on of valve amic tes tingpo s iti on of valve 12 ss uretrans ducer1 mic cy linder 20 .ve locit ytrans ducer2 lacementtranc ducer2 ortion al ove rf low valve23 .check valve un it2716