Analysis Of Automobile Harness Radiation Sensitivity Considering The Uncertain Influence Of Incident Field Excitation

With the rapid development of automobile industry,people can't live without automobiles.With the intelligent development of various electronic technologies,people's requirements for the functionality,safety and other aspects of the automobile have also increased year by year.In order to meet people's needs,a large number of electrical and electronic equipment has been applied to the automobile,enriching the functions of the automobile.At the same time,the number of harnesses increases year by year.On the other hand,because the mobile communication system,radar,navigation and other communication systems are more and more used in people's lives,the electromagnetic interference in the automobile operation environment is more and more complex,which makes the automobile harness transmit the radiated energy in the surrounding environment into the electronic equipment of the automobile through the field line coupling way,leading to the failure of some functions of the automobile.In serious cases,it may even cause casualties.Therefore,it is necessary to analyze and study the uncertainty of automobile harness radiation sensitivity.In order to calculate and analyze the radiation sensitivity of automobile harness affected by uncertain factors,the following work is done in this paper:1.In this paper,firstly,the radiation sensitivity equation of automobile harness is derived based on transmission line theory,and two methods of calculating unit length parameter matrix,analytical method and numerical method,are introduced.The analytic method mainly introduces the image method,while the numerical method introduces the moment method and the finite element method.In this paper,the finite element method based on ANSYS Q3 D is used to calculate the parameter matrix of the unit length of the automobile harness.At the same time,compared with the calculation results of the analytical method,considering the application of the automobile harness,the settlement results of ANSYS Q3 D shall prevail.Combined with the deduced radiation sensitivity equation of automobile harness,the induced current of the radiation sensitivity of automobile harness is calculated by making the relevant variables of incident field?elevation ?,azimuth?,polarization ?,level amplitude E₀?as fixed values.2.Considering the uncertainty of the relevant variables of the incident field,it is expensive to use the equations derived in the previous section to calculate the relevant statistical data.In order to improve the calculation efficiency,this paper introduces the non-interference generalized polynomial chaos method and Sobol global sensitivity analysis method.The non-interference generalized polynomial chaos method includes random response surface method and polynomial chaos method based on projection method,which can establish agent model for fast calculation.Sobol global sensitivity analysis method takes variance decomposition as the core idea,which can quantify the influence degree of each random input variable on the whole model.This paper use the non-interference generalized polynomial chaos method to calculate the statistical parameters of the radiation sensitivity of the automobile harness,and use the Sobol method to calculate the global sensitivity of each random input variable.By comparing the results with Monte Carlo method,it is proved that the method can analyze the uncertainty of automobile harness radiation sensitivity quickly and effectively.3.In order to further improve the calculation efficiency of the uncertainty of radiation sensitivity of automobile harness,based on the generalized polynomial chaos method,the adaptive sparse polynomial chaos method is proposed in this paper.The model is sparse from two aspects of truncation scheme and polynomial coefficient calculation.As for the truncation scheme,this paper combines the adaptive selection algorithm with the hyperbolic truncation scheme,and uses the adaptive hyperbolic truncation scheme to carry out the preliminary sparse processing of the model.Then,in this paper,the least angle regression method is used to further sparse the model.Combined with the same practical numerical example,this paper calculates the relevant statistical parameters of the radiation sensitivity of the automobile harness,and calculates the global sensitivity indices of each random input variable,and compares the calculation results with the Monte Carlo method,which proves that that the adaptive sparse chaotic polynomial can effectively improve the calculation efficiency on the premise of ensuring the calculation accuracy.It is an efficient analysis method for the uncertainty of radiation sensitivity of automobile harness.Based on the analysis results,some suggestions are put forward for the design of automobile harness.In view of the uncertainty of automobile harness radiation sensitivity,the adaptive sparse polynomial chaos method proposed in this paper can analyze it quickly and effectively,and quantify the impact of different uncertainty factors on automobile harness radiation sensitivity,which has reference significance for the optimization and design of automobile harness model.