基于偏相干分析的车内噪声源识别与控制研究

发布时间：2018-07-24 08:41

【摘要】：近些年来,人们对轻卡商用车提出了轿车化的驾乘体验,无疑将重点问题落实在汽车NVH性能指标上。如何快速准确发现车内噪声振动问题,并有效控制解决,从而提升整车NVH性能,是目前汽车开发环节的重要研究课题。本文依据汽车噪声振动评价标准,开展整车道路试验,通过对比不同工况下标杆车和试制车的各项噪声振动数据,检验试制车性能是否达标,整车设计是否合理,明确试制车目前存在的主要问题。针对试制车驾驶室内噪声水平较高问题,在转鼓消声室内进一步深入研究,测试评价整车密闭性能,分析WOT工况各噪声源随挡位及发动机转速变化规律,同时为偏相干分析采集匀速工况车内及各噪声源噪声振动试验数据。简述偏相干函数理论推导公式,分别与常相干函数和重相干函数作对比,表明偏相干分析方法的高效性和准确性。建立轻卡商用车多输入单输出声源系统模型,结合试验测试所得车内和各个噪声源噪声振动频谱,利用偏相干技术有效识别出轻卡商用车的主要噪声来源,为驾驶室内减振降噪指明方向。根据整车试验和偏相干分析研究结果,最终分别对车内仪表台和顶棚结构辐射噪声、进气系统和后置消声器以及轮胎-路面等主要噪声源传播噪声进行针对性的控制研究,为今后车内低噪声设计开发提供了一种高效准确的技术方法。
[Abstract]:In recent years, people put forward the experience of limousine driving for light truck commercial vehicles, which undoubtedly put the key problem into practice on the performance index of automobile NVH. How to quickly and accurately detect the noise and vibration of the vehicle and effectively control and solve it so as to improve the NVH performance of the whole vehicle is an important research topic in vehicle development at present. According to the evaluation standard of vehicle noise and vibration, the whole vehicle road test is carried out in this paper. By comparing the noise and vibration data of the benchmarking vehicle and the trial car under different working conditions, the performance of the trial car is up to the standard and the design of the whole vehicle is reasonable. Identify the main problems existing in the trial production of the car. In view of the problem of high noise level in the cab of the trial vehicle, the noise sources of the whole vehicle are tested and evaluated in the noise suppression chamber of the drum, and the variation law of the noise sources with the baffle and the engine speed is analyzed. At the same time, the noise vibration test data are collected for the partial coherence analysis. The theoretical derivation formula of partial coherence function is briefly introduced and compared with the constant coherence function and the repeated coherence function respectively. The results show that the method of partial coherence analysis is efficient and accurate. The model of multi-input single-output sound source system of light truck commercial vehicle is established, and the main noise sources of light truck commercial vehicle are effectively identified by partial coherence technology combined with the noise and vibration spectrum of each noise source obtained from the test. For the cab vibration and noise reduction direction. According to the results of vehicle test and partial coherence analysis, the noise propagation from main noise sources, such as air intake system, rear muffler, tire and road surface and so on, are studied respectively. It provides an efficient and accurate technical method for the design and development of low noise in the future.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U461.4

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