Fault Analysis And Study Of Rigid-Flexible Coupling Gearbox System

In modern machinery and equipment, gearbox system as a common and essential component, because of its complex structure, working in great strength, poor working conditions and other reasons, it is susceptible to damage and failure. While the event of failure occur,it often result in enormous security issues and economic interests. Therefore, whether from the perspective of security or economic benefits point, condition monitoring and fault diagnosis to gearbox system, to prevent failures from occurring, all have significant value and meaning.The Virtual Prototyping Technology can be used to simulate various failures of gearbox system, and analysising those vibration signals is a emerging issues which is developing and improving with the computer technology in recent years.These vibration signals which are collected on the gear box contain a lot of information to reflect the operational status of the gearbox system. The paper established a rigid-flexible coupling virtual prototype of the gear box system, simulated and studied the vibration signal of the gear box. The simulation results were consistent with the calculated value and experimental data, which verified the correctness and credibility of the model. And it provided a new idea for gear box fault diagnosis and fault signal extraction with virtual prototype.In this paper, the following major tasks to be carried out:(1) Using three-dimensional solid modeling software PROE created the part drawing and the three-dimensional solid assembly model of the gearbox system, and especially discussed the method of parametric modeling with the spur gear as an example.(2) With the help of Pro/E and ADAMS data conversion interface software Mechanism/Pro, transformed the three-dimensional solid model of the gearbox system into ADAMS, and generated the rigid model of gearbox system. This paper established a rigid-flexible coupling virtual prototype of the gear box which contained the flexible shaft and the flexible box which was obtained by using of the finite element analysis software ANSYS, and it was also needed imposing constraints, loads and drives on the model.(3) By simulation of the model in three conditions of normal,gear wear fault and gear broken teeth,the simulation results were consistent with the calculated value and experimental data,which verified the correctness and credibility of the model.(4) In this paper, taking the vibration signal of the gearbox system which is extract from the simulation as an example analysis the vibration signal processed methods sunch as time domain analysis, the frequency domain analysis, Zoom FFT, demodulation spectrum analysis advantages in gearbox vibration feature analysis and feature extraction.