【作者】 刘勇；

【导师】 郑泉；

【作者基本信息】 安徽农业大学 ， 车辆工程， 2017， 硕士

【摘要】 本文以某车型的分动器传动系统为研究对象,主要应用模态试验、NTF试验、结构有限元法、声学边界元法等研究手段,对分动器的齿轮传动系统振动特性和分动器箱体辐射噪声进行试验与仿真分析研究,进而通过降噪优化方法对分动器齿轮箱体进行相应处理以达到减振降噪的目的。本文的主要研究内容有以下几点:(1)分动器齿轮动态激励计算与分析。对分动器齿轮传动系统使用集中参数模型进行动力学模型建模,并为了计算分别对动力学方程进行量纲归一化处理。在此基础上,对分动器三维模型进行建立,并使用Adams进行多体动力学建模,分析其动态激励力;(2)分动器箱体进行模态分析和振动响应分析。建立了分动器箱体结构有限元模型,开展分动器模态试验,通过模态试验与仿真分析得到的结果对比,验证了所建立的结构有限元模型的准确性。将齿轮激励力作为边界条件,计算基于模态的振动响应分析,得到箱体表面的振动加速度响应。(3)分动器箱体辐射声场计算。建立分动器箱体的声学边界元模型,将NTF试验数据与声学数值计算得到的数据相比较,验证了所建立的分动器箱体声学边界元模型的准确性。对分动器场点处进行频响计算,得到了频响曲线图。利用ATV和MATV法的贡献量计算方法,进一步研究了噪声声压峰值产生的原因和机理。(4)噪声控制优化。根据声场分析结果,采用基于综合应变能和尺寸优化方法的自由阻尼层优化,有效降低了辐射噪声的峰值。更多还原

【Abstract】 In this paper,we mainly use modal test,NTF test,structural finite element method and acoustic boundary element method to study the vibration characteristics of the gear transmission system of the transfer case gear and the radiation noise of the transfer case box are tested and simulated.Through the noise reduction optimization method to deal with the transfer case gear box to achieve the purpose of vibration and noise reduction.The main contents of this paper are as follows:Calculation and analysis the dynamic excitation oftransfer case gear: The transmission systemof the transfer case gear is modeled by using the lumped parameter model,and the dynamic equations are normalized by the dimension.On this basis,the three-dimensional model of the transfer case is established,and the multi-body dynamics model is built using Adams.Analyzing the dynamic ex-citing forces.Modal analysis and vibration response analysis of the transfer case box: The finite element model of the transfer case structure is established,and the modal test of the transfer case is carried out.The accuracy of the finite element model is verified by comparing the results obtained by the modal test and simulation analysis.The gear excitation force is used as the boundary condition;calculate the vibration response based on the modal.Then,the vibration acceleration response of the surface of the box is obtained.Calculate the radiation sound field of transfer case: The acoustic boundary element model of the transfer case box is established,and the accuracy of the proposed model is verified by comparing the NTF test data with the data calculated by the acoustic numerical calculation.Calculate the frequency response on the transfer case filed point;The frequency response curve is obtained.The causes and mechanism of noise peak sound pressure are studied by using the contribution method of ATV and MATV method.Noise control optimization: According to the results of sound field analysis,the free damping layer optimization is based on the integrated strain energy and size optimization method.Effectively reducing the peak ofradiation noise.更多还原