Inverse solution method for nonlinear stiffness characteristic parameters and curve of suspension of air spring seat

Abstract

The invention relates to an inverse solution method for nonlinear stiffness characteristic parameters and a curve of a suspension of an air spring seat, and belongs to the technical field of vehicle seats. The inverse solution method is characterized in that the nonlinear stiffness characteristic parameters and the curve of the suspension of the air spring seat are obtained in an inverse solution mode through utilization of vertical vibration signals, obtained through measurement, of a cab floor and a seat surface and according to a built seat-human-body vibration model of a nonlinear stiffness characteristic-piecewise linear function Fk and target functions of inverse solution parameters (theta 1, theta 2, theta 3, theta 4 and theta 5), a vibration model of a nonlinear stiffness characteristic-odd power polynomial Fs, and optimization target functions of reverse parameters (Ks 1 and Ks 3). By means of the inverse solution method, the nonlinear stiffness characteristic parameters and the curve of an air spring seat suspension system can be accurately obtained, human body vibration modeling and analyzing precision of the seat is improved, and design level and quality of the seat suspension system are improved; meanwhile, testing expenses further can be lowered, and the product design and development speed is improved.

Description

technical field [0001] The invention relates to a vehicle seat, in particular to an inverse calculation method of the non-linear stiffness characteristic parameters and curves of an air spring seat suspension. Background technique [0002] Air springs have ideal nonlinear stiffness characteristics and have been widely used in seat suspension systems in recent years. The comfort of the seat system is one of the important indicators to evaluate the performance of the car. In order to improve the comfort of the car seat system, it is necessary to establish the human body vibration model of the vehicle seat, so as to analyze and optimize the design of the seat suspension system. The accuracy of the stiffness characteristic curve of the air spring seat suspension of the human body vibration model of the vehicle seat directly determines the accuracy of the human body vibration model of the vehicle seat, thereby determining the optimal design result of the seat suspension system a...

AI Technical Summary

Problems solved by technology

At present, in the study of the comfort of the car seat system, there are mainly two methods to obtain the nonlinear stiffness curve of the air spring seat suspension system: the first method is based on the experimental data of a large number of air spring tests, through curve fitting It can be converted into the nonlinear stiffness curve of the air spring seat suspension system. This method has high test cost and long cycle; the second method is to establish a multinomial odd power mathematical model of the stiffness curve based on the air spring seat suspension system. Direct acquisition of nonlinear stiffness characteristic curve of air spring seat suspension system by system identification technology

Using the second method, although the multinomial odd power expression can better fit the test curve when simply designing the stiffness characteristics of the seat suspension, however, this method is not suitable for complex seat suspensions. When identifying the model system, it is difficult to give the range of each stiffness coefficient. If the given range is small, the target search value will be outside the given range. If the given range is too large, the calculation of the identification algorithm will take a lot of time, and there will be may not be able to find the ideal value

Therefore, at present, there is no low-cost, fast and accurate method to obtain the nonlinear stiffness characteristic curve of the air spring seat suspension system. It is necessary to establish a reverse method for the nonlinear stiffness characteristic parameters and curves of the air spring seat suspension system

Images