【作者】 张骏；

【导师】 蔡振兵； 肖新标；

【作者基本信息】 西南交通大学 ， 材料工程（专业学位）， 2017， 硕士

【摘要】 城际动车组以其快捷、舒适、节能、环保等优点在我国快速发展起来。而列车运行速度的提高必然带来严重的车内噪声污染,尤其是动车组车内端部噪声问题。本文针对时速250公里动车组车内噪声问题,基于试验和仿真相结合的方法,对其声源特性及其贡献量进行分析。首先,基于线路试验,分析了车内噪声的空间分布特性、频谱分布特性以及源强分布特性。然后通过声源识别测试手段,明确了端部噪声声源主要位于内端门区域,并且通过计算分析了端部声源的区域贡献量。其次,在声学实验室,对车体关键结构(地板、侧墙、顶板和端墙)进行测试,获得车体关键结构的模态密度、内损耗因子、耦合损耗因子以及隔声特性。将线路试验获得的声源激励和振动激励以及声学实验室获得的车体关键结构参数输入到SEA模型中,建立了完整的车内噪声预测模型,并结合车内噪声测试结果对模型进行了校核和验证。最后,运用本文所建立的车内噪声预测模型,对车内噪声的声压级响应进行计算分析,明确了车内噪声的空间分布情况。紧接着分析了车内噪声输入功率贡献,找出了主要声源和传递路径,并且分析了声源贡献量。结果表明:车内噪声主要来源来自于转向架区域噪声,贡献率达到30%以上;其次为车身表面区域噪声,贡献率达到20%以上;侧墙振动声辐射也是车内噪声的关键影响因素,贡献率达到15%。并且从声源和路径控制两个方面,调查了其对车内噪声的影响规律,为城际动车组车内噪声控制提供参考。更多还原

【Abstract】 The regional Electric Multiple Units have developed rapidly in our country with the advantages of fast,comfort,energy saving and environmental protection.The increase of the speed of the coach must cause serious interior noise,especially the noise of the rear end of the coach.Aimed at the interior noise problem of 250 km/h EMUs,the characteristics and contributions of interior noise sources are analyzed by means of test and simulation.Firstly,based on the field measurement,the distribution,frequency and intensity of the sources are obtained.Then the main sources are identified in the areas of door by the spherical acoustic array and the area contribution is analyzed.Secondly,the modal density,damping loss factor,coupling loss factor and transmission loss of car body structures,such as floor,sidewall,roof and headwall,are obtained from the laboratory test results.The sources from the field measurement result and the parameters of plate structures of the model from the laboratory test results are applied into the SEA modal.Then the prediction results are compared with the test results and the model is verified.Finally,based on the interior noise prediction modal,the response of sound pressure is calculated and the spatial distribution of noise is identified.Then the contribution of power input is analyzed to find the main sources and noise transmission paths and analyze the contribution of noise sources.The results show that the interior noise sources are mainly form the bogie area noise and the contribution rate is above 30%.The body surface area noise is secondly noise source and its contribution rate is above 20%.The vibration of the sidewall is also the key factor and its contribution rate is 15%.And the influence of the interior noise is investigated from the control of noise sources and paths,which provide reference for interior noise control for regional EMUs.更多还原