Uncertainty Analysis Of Electromagnetic Compatibility Characteristics Of Cable Under Vibration Stress

As the level of electrification of equipment such as airplanes and motor cars has increased,the electromagnetic environment within the equipment has become increasingly complex.When the service life of the equipment increases,the transmission performance of the cables laid therein may change due to the complex working environment,which greatly increases the risk of equipment failure.However,the current electromagnetic compatibility assessment does not consider the impact of non-electromagnetic environmental stress during the use of the equipment.Therefore,this topic investigates the current situation that the electromagnetic compatibility characteristics of cables are affected by vibration during actual operation.According to the electromagnetic compatibility characteristics of the cable,it is proposed to use the random point configuration method to deal with the randomness of the position caused by the vibration,build a cable crosstalk model and a radiation model that consider the uncertainty of the electrical parameters,and analyze these uncertainties to the cable The impact of performance provides theoretical and technical support for the electromagnetic compatibility evaluation closer to the actual use environment of the device.The change of electromagnetic compatibility characteristics when the cable is subjected to vibration is essentially a multi-level uncertainty transfer problem.Therefore,this article first analyzes the maximum displacement response of the cable when subjected to random vibration from the perspective of vibration mechanics.Through the theoretical analysis of vibration mechanics,combined with finite element simulation,the influencing factors of the displacement response of the cable under forced vibration are analyzed,and the 3-? displacement is solved based on the assumption of Gaussian distribution as the displacement range of the subsequent uncertainty analysis.Secondly,this article explores the calculation method of cable electromagnetic compatibility characteristics.For the cable crosstalk characteristics,a two-conductor transmission line model was built using the finite difference time domain method to solve the near-end crosstalk voltage and the far-end crosstalk voltage.For the radiation characteristics of the cable,the bare copper wire radiation model was built by CST software to explore the electric field characteristics of 1m.Finally,considering the non-uniformity of the cable during vibration,the uncertainty analysis of the random position of the cable during vibration is performed by the Monte Carlo method and the random point arrangement method.When exploring the crosstalk characteristics of the cable,the impact of the vibration line shape with different orders of modal fitting on the final uncertainty analysis was found.It was found that the intrinsic modes above 3rd order together had little effect on the final uncertainty analysis results..Investigating the influence of different 3-? displacement ranges on the crosstalk characteristics of the cable,it was found that as the 3-? displacement increases,the distribution of crosstalk voltage becomes more dispersed.As for the radiation characteristics of the cable,the influence of the change of the distance between the cable and the ground on the radiated electric field 1m away is greater than the change of the distance of the observation point.Regardless of the solution to the cable crosstalk characteristics or the cable radiation characteristics,the random point placement method exhibits higher efficiency than the Monte Carlo method.