机械专业论文中英文.doc

精品范文模板 可修改删除撰写人：___________日 期：___________Gearbox Noise —— Correlation with Transmission Error and Influence of Bearing Preload变速箱噪声——相关的传输错误和轴承预压的影响摘要ABSTRACTThe five appended papers all deal with gearbox noise and vibration. The first paper presents a review of previously published literature on gearbox noise and vibration.The second paper describes a test rig that was specially designed and built for noise testing of gears. Finite element analysis was used to predict the dynamic properties of the test rig, and experimental modal analysis of the gearbox housing was used to verify the theoretical predictions of natural frequencies.In the third paper, the influence of gear finishing method and gear deviations on gearbox noise is investigated in what is primarily an experimental study. Eleven test gear pairs were manufactured using three different finishing methods. Transmission error, which is considered to be an important excitation mechanism for gear noise, was measured as well as predicted. The test rig was used to measure gearbox noise and vibration for the different test gear pairs. The measured noise and vibration levels were compared with the predicted and measured transmission error. Most of the experimental results can be interpreted in terms of measured and predicted transmission error. However, it does not seem possible to identify one single parameter,such as measured peak-to-peak transmission error, that can be directly related to measured noise and vibration. The measurements also show that disassembly and reassembly of the gearbox with the same gear pair can change the levels of measured noise and vibration considerably.This finding indicates that other factors besides the gears affect gear noise.In the fourth paper, the influence of bearing endplay or preload on gearbox noise and vibration is investigated. Vibration measurements were carried out at torque levels of 140 Nm and 400Nm, with 0.15 mm and 0 mm bearing endplay, and with 0.15 mm bearing preload. The results show that the bearing endplay and preload influence the gearbox vibrations. With preloaded bearings, the vibrations increase at speeds over 2000 rpm and decrease at speeds below 2000 rpm, compared with bearings with endplay. Finite element simulations show the same tendencies as the measurements.The fifth paper describes how gearbox noise is reduced by optimizing the gear geometry for decreased transmission error. Robustness with respect to gear deviations and varying torque is considered in order to find a gear geometry giving low noise in an appropriate torque range despite deviations from the nominal geometry due to manufacturing tolerances. Static and dynamic transmission error, noise, and housing vibrations were measured. The correlation between dynamic transmission error, housing vibrations and noise was investigated in speed sweeps from 500 to 2500 rpm at constant torque. No correlation was found between dynamic transmission error and noise. Static loaded transmission error seems to be correlated with the ability of the gear pair to excite vibration in the gearbox dynamic system.论文描述了该试验台是专门设计和建造噪音齿轮测试。

有限元分析，用于预测试验台的动态特性和实验的变速箱壳体模态分析用于验证自然试验台这第三个文件，齿轮精加工方法和变速箱齿轮的偏差影响的理论预测噪声主要是研究在什么的实验研究十对被测试设备制造使用三种不同的整理方法传输错误，这被认为是一个重要的激励机制齿轮噪音，测量以及预测该试验台是用于测量变速箱噪音及不同的测试装置对振动测得的噪音和振动水平进行比较，预测和实测的传输错误实验结果大多可以解释和预测传输测量误差项但是，它似乎并不能够确定一个单一的参数，如测得的峰 - 峰值传输错误，可直接与测得的噪声和振动测量结果还显示，拆卸和使用相同的变速箱齿轮副重组可以改变测得噪声和振动.这个水平发现表明，除了其他因素的影响齿轮齿轮噪音第四，轴承影响或变速箱噪音和振动预紧力进行了调查振动测量均在140牛米和400nm的扭矩水平，用0.15毫米和0毫米轴承间隙，并用0.15 mm轴承预紧力结果表明，轴承间隙和预紧力影响变速箱的振动预装轴承，振动增加超过2000转和2000转的速度低于下降速度，相比与轴端间隙轴承有限元模拟表现出同样的倾向作为测量值第五本文介绍如何通过优化变速箱噪声为减少传输错误齿轮几何减少关于齿轮偏差和不同扭矩的鲁棒性考虑，以便找到一个齿轮几何给予尽管从名义几何由于制造公差偏差范围内以适当的扭矩，噪音低。

静态和动态的传输错误，噪声，振动测量和该之间的动态传输错误，房屋振动和噪声的相关性研究了扫描速度从500到2500在恒转矩转速没有相关关系的动态传递误差和噪声静态加载的传输错误似乎与齿轮副的能力，激发动力系统中的齿轮箱振动相关Keywords: gear, gearbox, noise, vibration, transmission error, bearing preload.关键词：齿轮，变速箱，噪声，振动，传输错误，轴承预紧力 1 INTRODUCTION1 引言1.1 BackgroundNoise is increasingly considered an environmental issue. This belief is reflected in demands for lower noise levels in many areas of society, including the working environment. Employees spend a lot of time in this environment and noise can lead not only to hearing impairment but also to decreased ability to concentrate, resulting in decreased productivity and an increased risk of accidents. Quality, too, has become increasingly important. The quality of a product can be defined as its ability to fulfill customers’ demands. These demands often change over time, and the best competitors in the market will set the standard.Noise concerns are also expressed in relation to construction machinery such as wheel loaders and articulated haulers. The gearbox is sometimes the dominant source of noise in these machines.Even if the gear noise is not the loudest source, its pure high frequency tone is easily distinguished from other noise sources and is often perceived as unpleasa。