A method for quickly predicting the frequency-domain dynamic characteristics of vehicle wiring harness crosstalk

Abstract

The invention discloses a method for quickly predicting the crosstalk frequency domain dynamic characteristics of a vehicle harness. The method includes the steps that first, wires in the vehicle harness are considered to be weakly coupled in a loss-free mode; second, a primary function corresponding to a polynomial chaos expansion method is selected to be used as a Legendre orthogonal polynomial through the calculation method in the first step according to variables in a uniform distribution type; third, a random process Y (theta) can be expanded through the orthogonal polynomial; fourth, the Legendre orthogonal polynomial is used for expanding unit mutual reactance Lm and unit mutual capacitance Cm; fifth, after the mean value and variance of the unit mutual reactance Lm and the unit mutual capacitance Cm of vehicle harness wires are acquired, the crosstalk mean value and variance of the harness wires are calculated. The method for quickly predicting the crosstalk frequency domain dynamic characteristics of the vehicle harness has the advantages that the crosstalk frequency domain dynamic characteristics of the vehicle harness can be predicted rapidly, an important basis is provided for the early stage design of the electromagnetic compatibility of a vehicle, so that the determination method is more complete, simulation computing time is shortened, the requirement for a computer memory is lowered, and calculation results are more accurate.

Description

technical field

[0001] The invention relates to a method for quickly predicting the dynamic characteristics of crosstalk of vehicle wiring harnesses, in particular to a method for quickly predicting the dynamic characteristics of frequency domain crosstalk of vehicle wiring harnesses. Background technique

[0002] In recent years, more and more electrical and electronic devices have been applied to automobiles and rail vehicles to improve the safety and driving performance of vehicles. But at the same time, this also forms a more complex circuit network and electromagnetic environment inside the vehicle. The wiring harness is the main body of the vehicle circuit network, connecting the electrical and electronic components inside the vehicle and making them function, but the wiring harness extending in all directions It also plays an important role in the electromagnetic interference inside the vehicle. It provides a carrier for the propagation of the interference signal. The...

Examples

Embodiment Construction

[0059] The method for quickly predicting the dynamic characteristics of crosstalk frequency domain of vehicle wiring harness described in the present invention, its specific method is as follows:

[0060] Step 1: The automotive wiring harness selected in this example complies with the automotive cable standard. It contains 14 wires, the length L=1m, the wire harness radius R=4.1mm, the overall center-to-ground height of the wire harness is H, and the wire material in the wire harness is Copper, insulation layer is PVC (polyvinyl chloride), relative permittivity ε r is 3.0, the radius of the wire is about 1mm, the radius of the conductor (copper) in the wire is r=0.45mm, the thickness of the insulating layer is Δr=0.45mm, and the excitation voltage of the emission line is Vs=1V, and the source impedance and terminal impedance are divided into high impedance and low impedance In two cases, Rs=R L =R NE =R FE = 50Ω and Rs = R L =R NE =R FE =1kΩ, such as figure 1 As shown, ...

technical field

[0001] The invention relates to a method for quickly predicting the dynamic characteristics of crosstalk of vehicle wiring harnesses, in particular to a method for quickly predicting the dynamic characteristics of frequency domain crosstalk of vehicle wiring harnesses. Background technique

[0002] In recent years, more and more electrical and electronic devices have been applied to automobiles and rail vehicles to improve the safety and driving performance of vehicles. But at the same time, this also forms a more complex circuit network and electromagnetic environment inside the vehicle. The wiring harness is the main body of the vehicle circuit network, connecting the electrical and electronic components inside the vehicle and making them function, but the wiring harness extending in all directions It also plays an important role in the electromagnetic interference inside the vehicle. It provides a carrier for the propagation of the interference signal. The...

Examples

Embodiment Construction

[0059] The method for quickly predicting the dynamic characteristics of crosstalk frequency domain of vehicle wiring harness described in the present invention, its specific method is as follows:

[0060] Step 1: The automotive wiring harness selected in this example complies with the automotive cable standard. It contains 14 wires, the length L=1m, the wire harness radius R=4.1mm, the overall center-to-ground height of the wire harness is H, and the wire material in the wire harness is Copper, insulation layer is PVC (polyvinyl chloride), relative permittivity ε r is 3.0, the radius of the wire is about 1mm, the radius of the conductor (copper) in the wire is r=0.45mm, the thickness of the insulating layer is Δr=0.45mm, and the excitation voltage of the emission line is Vs=1V, and the source impedance and terminal impedance are divided into high impedance and low impedance In two cases, Rs=R L =R NE =R FE = 50Ω and Rs = R L =R NE =R FE =1kΩ, such as figure 1 As shown, ...

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