混合传递路径分析方法
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摘要
根据悬臂壳实验台结构建立有限元模型,并结合实验模态分析对其进行修正,建立高精度有限元模型。利用实验模态分析结果计算结构阻尼参数,确立混合传递路径分析(TPA)中频率响应函数(FRF)的有限元计算方法,并且与实验结果对比,验证其有效性和可行性。利用Tikhonov正则化方法进行载荷识别,对悬臂壳实验台进行混合TPA实验研究,获得不同频率下各路径对目标点振动的贡献量,并将各路径对目标点的振动贡献量进行矢量叠加,与实验测试值进行对比。结果表明,各路径贡献量叠加结果与实验测试值吻合较好,可确定该结构的主要振动传递路径,从而为结构优化奠定基础。
The finite element model of the structure of a cantilever-shell test bench is established and modified through the modal test to obtain a high-precision model. The structural damping parameters are calculated using the results of the modal test. Then,the method of acquiring frequency response functions(FRF) based on the finite element model is established,and the effectiveness and the feasibility of this method are verified by the modal test. By means of load identification using Tikhonov regularization method,the transfer path analysis(TPA) of the cantilever-shell is finished by the mixed transfer path analysis method,and the contribution of each transfer path to the vibration of the target points is obtained for different frequencies. Then the contributions of all transfer path are superimposed,and the result is compared with the measured signals. The results show that the superimposed results are in good agreement with the measured signals and the principal transfer paths of vibration of the structure can be determined with this method. This study has provided the basis for the structural optimization.
The finite element model of the structure of a cantilever-shell test bench is established and modified through the modal test to obtain a high-precision model. The structural damping parameters are calculated using the results of the modal test. Then,the method of acquiring frequency response functions(FRF) based on the finite element model is established,and the effectiveness and the feasibility of this method are verified by the modal test. By means of load identification using Tikhonov regularization method,the transfer path analysis(TPA) of the cantilever-shell is finished by the mixed transfer path analysis method,and the contribution of each transfer path to the vibration of the target points is obtained for different frequencies. Then the contributions of all transfer path are superimposed,and the result is compared with the measured signals. The results show that the superimposed results are in good agreement with the measured signals and the principal transfer paths of vibration of the structure can be determined with this method. This study has provided the basis for the structural optimization.
引文
[1]郭荣,裘剡,房怀庆等.频域传递路径分析方法(TPA)的研究进展[J].振动与冲击,2013,32(13):49-55.
[2]唐贵基,陈卓群.混合传递路径分析(TPA)方法的准确性验证[J].噪声与振动控制,2015,3 5(2):184-187.
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[5]吴成军.工程振动与控制[M].西安:西安交通大学出版社,2008.
[6]陈建群.基于信号分析的结构模态参数提取方法[D].西安:长安大学,2009.
[7]张洪才.ANSYS14.0理论解析与工程应用实例[M].北京:机械工业出版社,2012.
[8]RONASI H,JOHANSSON H,LARSSON F.Load identification for a rolling disc:finite element discretization and virtual calibration[J].Computational Mechanics,2012,49(2):137-147.
[2]唐贵基,陈卓群.混合传递路径分析(TPA)方法的准确性验证[J].噪声与振动控制,2015,3 5(2):184-187.
[3]PLUNT J.Finding and fixing vehicle NVH problems with transfer path analysis[J].Sound and Vibration,2005,39(11):12-17.
[4]KIM S J,OG K G,KIM S G,et al.Estimation to interior noise by using hybrid transfer path analysis[J].Noise Control Engineering Journal,2008,56(4):256-268.
[5]吴成军.工程振动与控制[M].西安:西安交通大学出版社,2008.
[6]陈建群.基于信号分析的结构模态参数提取方法[D].西安:长安大学,2009.
[7]张洪才.ANSYS14.0理论解析与工程应用实例[M].北京:机械工业出版社,2012.
[8]RONASI H,JOHANSSON H,LARSSON F.Load identification for a rolling disc:finite element discretization and virtual calibration[J].Computational Mechanics,2012,49(2):137-147.