外文翻译---汽车变速箱动态建模轮齿局部缺陷的早期检测-汽车设计

Dynamic Modeling of Vehicle Gearbox for EarlyDetection of Localized Tooth Defect Nagwa Abd-elha

Dynamic Modeling of Vehicle Gearbox for Early Detection of Localized Tooth Defect Nagwa Abd-elhalim, Nabil Hammed, Magdy Abdel-hady, Shawki Abouel-Seoud and Eid S. Mohamed Helwan University ABSTRACT Dynamic modeling of the gear vibration is auseful tool to study the vibration response of ageared system under various gear parameters and operating conditions. An improved understanding of vibration signal is required for early detection of incipient gear failure to achieve high reliability. However, the aim of this work is to make use of a6-degree-of-freedom gear dynamic model including localized tooth defect for early detection of gear failure. The model consists of agear pair, two shafts, two inertias representing load and prime mover and bearings. The model incorporates the effects of time-varying mesh stiffness and damping, backlash, excitation due to gear errors and modifications. The results indicate that the simulated signal shows that as the defect size increases the amplitude of the acceleration signal increases. The crest factor and kurtosis values of the simulated signal increase as the fault increases. Though the crest factor and kurtosis values give similar trends, kurtosis is abetter indicator as compared to crest factor. ： KEYWORDS Vibration acceleration, system modeling, Crest Factor, Kurtosis value, defect size, gear meshing, pinion, gear NOMENCLATURE ，，， Drive motor, pinion, gear, and load mass moment of inertia replacement decision in asuitable time. ， Masses of pinion and gear. Driving motor torque. Load torque. 17 第页共页