双驱动交互控制技术

在某些飞机起落架结构疲劳试验中,需要在不同受力情况下进行循环载荷加载疲劳试验。为了加载精确、降低成本、减少人力物力消耗,采用随动加载方式进行加载,即对加载设备使用位移定位控制,通过改变加载设备位置间接对试验件进行载荷加载,从而完成不同状态的载荷试验。以往位移控制一般使用伺服控制液压加载设备,控制信号易受外界干扰,存在定位不准确、加载器抖动等,从而导致位移定位存在误差,试验加载精度不够。为了解决这一问题,引入电驱动控制系统,该系统响应快、精度高,无液压油中间介质,性能稳定,多执行器同步性高。经过理论分析与研究并通过验证试验,使用液压驱动与电驱动交互控制技术完成试验加载控制,提高了试验加载精度,满足了起落架疲劳试验需求。试验结果表明,该技术可应用于一些特殊的飞机起落架结构强度疲劳试验。

Dual Drive Interactive Control Technology

In some aircraft landing gear structural fatigue tests, cyclic load fatigue test is needed under different stress distribution state. In order to load precisely, reduce cost, reduce the waste of resources, servo loading method is adopted. Namely using displacement positioning control for loading device, indirect loading to test pieces is realized by changing the loading equipment location, to finish loading test of different state. In the past displacement control, hydraulic servo control loading equipment is used, generally control signals are susceptible to interference, positioning inaccurate and loader jitter etc are existed, resulting in positioning displacement error and poor test loading precision. In order to solve this problem, the electric control system was introduced. The system had quick response speed, high precision, no hydraulic oil intermediate medium, stable performance and high synchronicity of more actuators. Through theoretical analysis and research, and through verification test, using hydraulic drive and electrical drive interaction control technology could complete the test load control, improve the test precision, meet the demand of the gear fatigue test.The test results show that the technology can be applied to some special aircraft landing gear structure fatigue strength test.