Digital Modeling and Dynamic Simulation Analysis of Gear Transmission System in Bolt Fault State
In order to explore the influence of bolt loosening and fracture faults on the dynamic character-istics of gear reducers,and improve the theory and method of early fault diagnosis in gear transmission systems,this paper established a parameterized model of a digital prototype of a helical gear reducer from intact to faulty states.The vibration differential equation of a multi-stage gear transmission system of digit-al prototype was derived using the theory of multibody dynamics.The dynamic characteristics of the gear reducer under intact and faulty states were studied by using digital prototype and internal drive solution model,and the vibration characteristics of bolt loosening and fracture faults were obtained.The results show that compared with intact states,bolt failure increases the amplitude of gear engagement frequency,the magnitudes of the two-stage engagement frequencies increase by about 19.8%and 45.4%respective-ly when the bolts are loosened,and loose bolts will cause sidebands on both sides of the engagement fre-quency;the magnitudes of two-stage engagement frequencies increase by about 15.3%and 2.1%re-spectively when the bolts are broken.
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