基于虚拟仪器的离心泵振动测试系统设计

Vibration Test System Design for Centrifugal Pumps Based on Virtual Instrument Technology

为了对离心泵内部流动诱导振动进行研究,获得较可靠的振动试验数据,同时针对传统离心泵振动测试方法所需仪器较多、较复杂、可靠性较差和成本较高等缺点,基于虚拟仪器技术,应用LabVIEW图形化、模块化的编程语言编写了数据采集和处理程序,采用闭式回路试验装置以及先进的振动加速度传感器和数据采集卡,组建了离心泵流动诱导振动测试系统。详细阐述了系统的硬件结构和软件结构的组成、功能和设计思想及理论依据,并利用该系统对试验离心泵振动加速度信号进行了采集以及数据的FFT处理。通过将试验测得数据的频域信息与离心泵流动诱导振动相关理论进行对比分析,验证了本系统在实际测量中的准确性和实用性。

To acquire reliable test data of the research on flow-induced vibration and overcome the defects of the traditional vibration test methods, such as complicated instruments, low reliability, high costs and so on, the flow- induced vibration measurement and analytical system for centrifugal pumps is established based on the virtual instrument technology using closed circle test stands, advanced accelerometers and signal acquisition. The program for acquisition and process procedure of vibration data are compiled with LabVIEW which is the graphical and modular programming language. The structure, function, design idea and theoretical basis of hardware and software systems for the test are described respectively. The system proved accurate and practical by a comparison between relevant theories on flow-induced vibration of centrifugal pumps and spectrum of acceleration test data by FFT.