外文翻译---汽车变速器动态建模轮齿局部缺陷的早期检测-汽车设计(编辑修改稿)

外文翻译---汽车变速器动态建模轮齿局部缺陷的早期检测-汽车设计(编辑修改稿)内容摘要：

are encountered (.,gears,bearings,splines,synchronizers,and clutch)[13]. A prehensive review of mathematical models used in gear dynamics, published before 1986,has been presented by[4].In this review, gear dynamic models without defects have been discussed. In the past few years, researchers have been working on the gear dynamic models which include defects like pitting, spalling, crack and broken tooth. A singledegreeoffreedom model is used which include the effects of variable mesh stiffness, damping, gear errors, profile modifications and backlash. The effect of timevarying meshing damping is also included in this case. The solution is obtained by using the harmonic balance methods. A method of calculated the optimum profile modification has been proposed in order to obtain a zero vibration of the gear pair[57].They also proposed a linear approximate equation to mode the gear pair by using a singledegreeof freedom model. Gear rattle vibration is a undesirable vibration for passenger cars and light trucks equipped with manual transmissions. Unlike automatic transmissions, manual transmission do not have the high viscous damping inherent to a hydrodynamic torque converter to suppress the impacting of gear teeth oscillating through their gear backlash. Therefore a significant level of vibration an be produced by the gear rattle and transmitted both inside the passenger partment and outside the rattle, idle shake, and other vibration generated in the automobile driveline have bee an important concern to automobile manufactures in their pursuit of an increased level of perception of high vibration quality. The torsional vibration driveline is a major source of gear rattle vibration. The manual transmission produces gear tattle by the impacting of gear oscillating though their gear backlash. The impact collisions are transmitted to the transmission housing via shafts and bearings[8]. The gear pair dynamic models includi。