一种新型液压导管应变测量装置设计与研究

Design and research of a new strain measuring device for hydraulic pipe

针对飞行器液压导管应变测量环境复杂,传统有线测量设备传感器布置困难、引线多等问题,提出了一种新型液压导管应变测量方法。该方法基于频响函数法建立测量装置与导管的动力学模型,研究了两者之间的应变映射关系,设计了可拆卸式测量装置,实现传感器非接触测量导管应变;结合理论计算和有限元仿真,研究了测量装置对导管模态及应变的影响,优化了装置设计及相关尺寸参数;通过试验验证有限元仿真结果,检验了装置非接触测量液压导管应变方法的有效性。结果表明,测量装置对导管应变影响微弱,300 Hz以下应变重构相对平均偏差为6.2%,证明测量装置能够有效测得导管应变,该方法和装置有望解决复杂测量环境下飞行器液压导管应变的快速准确测量问题。

In response to the complicated measurement environment of the aircraft hydraulic pipes,and the problem of the difficult layout of the sensors of the traditional wired measuring equipment,this article proposes a new kind of strain measuring device for hydraulic pipes.Based on the frequency response function method,dynamical models of the pipe and the measuring device are established to study the mapping relationship between their strains.The device is detachable and specifically designed for realizing non-contact measurement of the pipe′s strain.Combined with theoretical calculation and finite element simulation,this work studies the measuring device′s influence on the mode and strain of the pip and optimizes the design of the measuring device including size parameters.The accuracy of finite element simulation and the effectiveness of the non-contact measurement method are evaluated by experiments whose results show that the influence of the measuring device on the pipe is weak,with a 6.2%relative average deviation of strain reconstruction below 300 Hz.The method and device are expected to solve problems for rapid and accurate measurement of the hydraulic pipe strain in the aircraft under complicated measurement environments.