4秒微重力实验舱导轨副轴承故障分析

Fault Analysis of Motion Guide in 4-second Microgravity Experiment Cabin

摘要:

全程可控的地基微重力试验设备是一种采用直线电机驱动实验舱体,以上抛下落方式来产生微重力环境的新型落塔装置,具有4秒的微重力模拟能力,同时可以模拟月球重力、火星重力以及匀速运动等多种重力环境,为了保证运行于轨道上的实验舱能够平顺运行,需要密切监测相应轮轨的运行状态。首先根据应用在实验舱上的轴具体实际轴承进行动力学建模,完成动力学仿真,针对实验舱不同的运动状态考虑到不同转速、不同载荷的情况,在时域与频域上进行故障分析对比,其次也在整个导轨副上不同的故障判断方法进行分析。最终得出具体故障模式的数据波形以及判断方法,为之后的实验舱导轨副故障诊断打下一定的基础,为后续在工程上得到的实验数据进行验证分析,具有一定的工程价值。

Abstract:

The whole-process controllable ground-based microgravity test equipment is a new type of tower dropping device that uses linear motor to drive the experimental cabin, and the above drop mode to generate microgravity environment. It has the microgravity simulation ability of 4 seconds, and can simulate the gravity environment of the moon, Mars gravity and uniform motion. In order to ensure the smooth operation of the experimental cabin running on the orbit, it is necessary to closely monitor the operation status of the corresponding wheel and rail.First of all, the dynamic modeling is carried out according to the actual bearing of the shaft applied in the experimental cabin, and the dynamic simulation is completed. The fault analysis and comparison are carried out in the time domain and the frequency domain according to the different motion conditions of the experimental cabin, taking into account the different rotating speeds and different loads. Secondly, the different fault judgment methods are also analyzed on the whole motion guide. Finally, the data waveform and judgment method of the specific fault mode are obtained, which lays a certain foundation for the subsequent fault diagnosis of the motion guide in the experimental cabin, and validates and analyzes the subsequent experimental data obtained in the project, which has certain engineering value.