Transfer Path Analysis Based On The Absolute Transmissibility Functions

In order to solve the noise,vibration and harshness(NVH)problems in the fields of automotive,high-speed train,aerospace and architecture industry,it's necessary to establish an effective transfer path analysis(TPA)model from various noise and vibration sources to the target to identify primary sources.A reasonable transfer path model has important guiding significance to engineering practice and structural updating.Therefore transfer path analysis has become a popular research field in engineering.TPA methods are studied in this paper.First of all,traditional TPA method is introduced along with three kinds of frequency response function estimation methods and three types of load identification methods.Tedious load identification procedures are required in the traditional transfer path analysis.To improve the efficiency of modeling and experiment,the advanced transfer path analysis(ATPA)method has been put forward.A modified transfer path analysis(N-TPA)based on absolute transmissibility function is proposed in this paper,by applying a normalization method to calculate absolute transfer function in order to reduce the ill-conditioned problem.Principal component analysis is used in contribution analysis to assess the influence level of all subsystems by constructing evaluation functions.Based on MATLAB GUI programming technique,the N-TPA toolbox is developed to provide friendly human-machine interface for research and engineering application.A spring-mass model is utilized to perform N-TPA method,and the model is updated based on the contribution analysis result.N-TPA method is then applied to the transfer path analysis of a plane model and a high-speed train cabin.The transfer path features of each subsystem are used to predict contributions to the targets.The N-TPA method shows good performance in both the precision and time consumption.