基于传递路径的动力传动系统NVH性能匹配研究

发布时间：2018-04-10 13:07

本文选题：动力传动系统 + NVH　；参考：《湖南大学》2016年硕士论文

【摘要】：汽车作为一个复杂的振动噪声系统,由数个子系统构成。每个子系统均有特定的振动噪声特性。动力传动系统作为车辆的重要组成部分,是汽车振动和噪声的主要来源。动力传动系统的振动特性对乘坐舒适性即NVH(Noise,Vibration,Harshness)性能有十分重要的影响。动力传动系统的振动特性传递到车身引起车身结构振动,最终造成车内噪声。NVH性能中噪音问题最容易察觉也最影响乘坐舒适性。以往针对动力传动系统的研究仅限于动力性和经济性,忽视了动力传动系统匹配对NVH性能的影响。本文以某微车为研究对象,从NVH性能的角度,用传递路径的方法针对动力传动系统的匹配进行了研究。其主要内容如下:1.对动力传动系统的激励源以及振动形式进行分析。动力传动系统是造成车内噪声的主要原因。动力传动系统的振动通过悬置传递到车身,引起车身振动,最终由于声固耦合的作用车身振动导致车内噪声。2.建立动力传动系统多体动力学模型。对样车的动力传动系统参数进行了测量,并根据测量的参数建立动力传动系统的多体动力学模型。对动力传动系统多体动力学模型进行了一系列的KC仿真分析。将KC仿真结果与实验结果对比,验证动力传动系统多体动力学模型的准确性。3.建立了Trimmed body有限元模型。对Trimmed body有限元模型进行模态分析。将有限元仿真分析结果与试验结果进行对比来验证有限元模型的准确性。对Trimmed body有限元模型进行噪声传递函数分析,分析结果供传递路径分析使用。对多体动力学模型进行Bench Test仿真。对发动机曲轴转矩进行测量,将获得的结果加载到动力传动系统多体动力学模型的发动机曲轴上,来进行与试验工况一致的Bench Test仿真。通过多体动力学模型的Bench Test仿真,提取底盘关键点的时域激励信息,供传递路径分析使用。4.对车内噪声影响因素进行分析。使用多体动力学仿真模型计算的底盘关键点激励信息以及Trimmed body有限元模型计算的噪声传递函数进行传递路径分析,分析各个激励路径对车内噪声的贡献量。通过传递路径方法对影响因素进行分析,得知后悬架板簧悬置刚度过大是造成车内噪声过高的原因。最终采取调整相应悬置点的衬套刚度来降低车内噪声。
[Abstract]:As a complex vibration and noise system, automobile is composed of several subsystems.Each subsystem has specific vibration and noise characteristics.As an important part of vehicle, power transmission system is the main source of vehicle vibration and noise.The vibration characteristics of the power transmission system have a very important effect on the ride comfort.The vibration characteristics of the power transmission system are transmitted to the body to cause the body structure vibration, resulting in the vehicle interior noise. NVH performance noise problem is the most easy to detect and the most important impact on ride comfort.In the past, the research of power transmission system was limited to power performance and economy, and the influence of power transmission system matching on NVH performance was ignored.From the point of view of NVH performance, the matching of power transmission system is studied by the method of transfer path.Its main content is as follows: 1.The excitation source and vibration form of power transmission system are analyzed.Power transmission system is the main cause of vehicle interior noise.The vibration of the power transmission system is transmitted to the body by mounting, which causes the vibration of the body. Finally, the vibration of the body caused by the acoustic-solid coupling results in the noise of the vehicle.The multi-body dynamic model of power transmission system is established.The parameters of power transmission system are measured, and the multi-body dynamic model of power transmission system is established according to the measured parameters.A series of KC simulation analysis for multi-body dynamics model of power transmission system is carried out.The simulation results of KC are compared with the experimental results to verify the accuracy of the multi-body dynamic model of power transmission system.Trimmed body finite element model is established.Modal analysis of Trimmed body finite element model is carried out.The accuracy of the finite element model is verified by comparing the finite element simulation results with the experimental results.The noise transfer function of Trimmed body finite element model is analyzed, and the result is used to analyze the transfer path.The multi-body dynamics model is simulated by Bench Test.The torque of engine crankshaft is measured, and the obtained results are loaded into the engine crankshaft of multi-body dynamics model of power transmission system, and the Bench Test simulation is carried out in accordance with the test condition.Through the Bench Test simulation of the multi-body dynamics model, the time-domain excitation information of the key points of the chassis is extracted for the transfer path analysis.The influence factors of vehicle interior noise are analyzed.The key point excitation information of chassis calculated by multi-body dynamics simulation model and the noise transfer function calculated by Trimmed body finite element model are used to analyze the transfer path, and the contribution of each excitation path to the vehicle interior noise is analyzed.Based on the analysis of the influence factors by the transfer path method, it is found that the excessive noise in the rear suspension spring is caused by the excessive rigidity of the suspension spring.Finally, adjusting the bushing stiffness of the corresponding mounting point is adopted to reduce the noise inside the vehicle.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.2

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