Auto-Testing System Of Blower Performance Based On Virtual Instrumentation

Blower performance testing is the course of changing working states, measuring testing datas, calculating performance parameters and plotting performance curves which processed under the certain rotate speed. It is important to inspecting finished production and designing new production. At present, blower testing work is handwork mostly in our country, which has some defects such as obsolete testing means, large labor and imprecise result. So applying the virtual instrumentation technology which combining the sense technology, instrumentation technology and testing technology to test performance parameter, process data and plot curve is the key points in this paper.Applying virtual instrumentation technology, the author designed the hardware and software of the blower performance testing system. In the hand of hardware, testing data is acquired automatically according to press-difference sensor, press sensor and torch sensor; blower speed is adjusted automatically according to frequency conversion of transducer and working state is auto controlled according to rotating baffle controlled by the step motor. In software, the module design method is applied, the acquired dates are showed real-timely and controlled messages are output precisely in the developing platform-Labwindows/CVI, other well, the performance curve is completely gained in applying least square method.The whole system has friendly interface, convenient operation and comprehensive functions, which can be used widely in scientific research institutes and factories. The system of blower performance auto-testing improves the stability of testing process, avoids the error of reading, the error of calculation and the error of result causing by relative datas can not be recorded at the same time, the precision and efficiency of testing is largely improved.