基于LabVIEW的汽油发动机振动故障诊断系统设计

摘要

Based on the virtual instrument technology, the vibration signal collection and analysis program is compiled with Lab VIEW. By researching on the characteristic of automobile engine, the fractal theory was used to diagnose the fault of engine. And the vibration signal is calculated and analyzed with G-P algorithm and the Matlab is used to pick up the fractal dimension by which the engine state can be judged. The variation range of fractal dimension is summarized under normal and six malfunction conditions. Finally, via case stud-y, the fractal theory is effective and accurate at engine malfunction diagnosis without disassembly.%基于虚拟仪器技术,利用LabVIEW编写了针对汽油机振动信号进行采集分析的程序.针对汽车发动机振动信号的非线性特点,将分形理论应用于发动机的故障诊断.利用G-P算法对采集到的振动信号进行计算、分析,借助Matlab提取振动信号分形维数,并通过分形维数判断发动机的状态,本文总结了在正常状态和6种故障状态下的分形维数的变化范围,最后通过实例验证了利用分形理论可以较为准确地对发动机进行不解体故障诊断的有效性.