Research On Fast Calculation Method Of Electromagnetic Radiation Of Spatial Bending Cable Bundle Considering Proximity Effect

Cable is the main source of electromagnetic radiation of electrical and electronic equipment.Therefore,the research of cable electromagnetic radiation is of great significance for the electrical and electronic equipment and systems to meet the requirements of electromagnetic compatibility.In practical engineering,cables are often bundled into bundles for wiring,and the proximity effect cannot be ignored.The existing analytical methods cannot solve this kind of problem,and the numerical methods are too time-consuming and laborious.Therefore,in this paper,the fast calculation method of electromagnetic radiation of spatial bending cable bundle considering proximity effect is studied.The main work is as follows:(1)Research on the fast calculation method of the distribution parameter matrix of the cable bundle considering the proximity effect.The fast calculation methods of capacitance matrix and inductance matrix of unit length considering proximity effect in two cases are derived.The method of moment and generalized capacitance matrix are combined to deduce the calculation method when a transmission line is used as the reference conductor.The method of moment and image theory are combined to deduce the calculation method when the infinite ideal conductive plane is used as the reference conductor.The selection principle of matching points in moment method is studied and improved.The correctness of the improved method is verified by numerical simulation,and the rapidity of the improved method is illustrated.(2)Research on the current calculation method of spatial bending cable bundle.The influence of proximity effect on the current is reflected in the calculation of unit length distribution parameters.The spatial bending cable bundle is equivalent to the cascade of multiple straight cable bundle,and the chain parameter matrix of each straight cable bundle is used to characterize them.Finally,each cable bundle is connected in series and the current on the cable bundle is calculated by combining the terminal constraints.Numerical simulation is used to verify the correctness of the proposed method,and the influences of factors such as the height of cable bundle from the ground,the ratio of cable insulation thickness to wire radius and the number of cables on the current amplitude of cable bundle are studied.(3)Research on the fast calculation method of the radiated electric field of the spatial bending cable bundle.Each current on each cable is regarded as a Hertz electric dipole,and the grounded part at both ends of the cable is also equivalent to a Hertz electric dipole.Their mirror image is used to replace the infinite ideal conductive plane,and the sum of the radiation fields generated by all Hertz electric dipoles is used to approximate the radiation field of the spatial bending cable bundle.The correctness of this method is verified by numerical simulation and experiment,and the rapidity of this method is illustrated by comparing the effectiveness of this method with that of numerical simulation.Finally,aiming at the cable bundle model used in the numerical simulation,the influences of factors such as the height of the cable bundle from the ground,the ratio of the thickness of cable insulation to the wire radius and the number of cables on the electric field amplitude of the cable bundle are analyzed.