【作者】 关贞珍；

【导师】 钱东平；

【作者基本信息】 河北农业大学 ， 农业机械化， 2002， 硕士

【摘要】 风机性能试验是在风机转速不变的情况下，改变风机运行工况、测量试验数据、计算风机性能参数并绘制性能曲线(流量—全压曲线、流量—功率曲线、流量—效率曲线)的过程。它对于成品的检验和新产品的开发至关重要。目前，我国风机性能检测大多以手工为主，存在试验手段落后，劳动量大和测试结果不准确等缺点。采用先进的虚拟仪器技术，将传感技术、仪器技术和测试技术结合起来，进行风机性能参数的自动检测，试验数据的自动处理和性能曲线的自动绘制是本文研究的重点。 本文采用虚拟仪器技术，进行了风机性能试验自动测试系统的硬件及软件设计。硬件上采用压差传感器、压力传感器和扭矩传感器检测各试验数据，实现了试验数据的自动采集；利用变频调速技术控制变频调速器输出信号的频率，实现了风机转速的自动调节；通过设置旋转挡板装置并用步进电机控制其旋转角度实现了风机运行工况的自动控制。软件上在LabWindows／CVI虚拟仪器开发平台上，采用模块化设计方法，实现了采集信号的实时显示、控制信号的准确输出、试验数据的正确处理及应用最小二乘法对性能参数进行拟合从而实现了性能曲线的自动绘制。 整个系统具有界面友好、操作方便、功能齐全等优点，试验结果表明研制基于虚拟仪器的风机性能自动测试系统，增加了试验过程的稳定性，避免了人为的读数误差、计算误差以及相关数据不能同时记录所引起的试验结果的偏差，提高了测试精度和试验效率。可广泛应用于科研院所和风机生产厂家，具有较高的推广应用价值。更多还原

【Abstract】 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.更多还原