The paper is based on the one-quarter vehicle vibration model of air suspension system with auxiliary chamber and stiffness adjustment theory and control characteristic of air suspension are discussed. On the basis, fuzzy control theory without mathematical precise model was applied to design the air suspension controller, and then an electronic control unit for air suspension is developed.
This paper analyzes the object vane motor and composite solar energy environmentally friendly cars , focusing on its air motor drive way , abstracted into five degrees of freedom vibration model vehicle , mathematical modeling , its stability and reliability analysis of research , and to optimize its speed and acceleration , and proved its stability and reliability of data through a lot of practice .
The purpose of this paper is to analyze the performance of the hydro-pneumatic suspension system (HPSs) of a mining dump truck on ride comfort under operating conditions. To achieve goals, a 3-D full-vehicle vibration model of a mining dump truck with 10 degrees of freedom is set up to analyze the effects. A nonlinear mathematical model is set up based on the nonlinear characteristics of the HPSs to determine their vertical force which is connected with a 3-D full-vehicle vibration model. The effects of operating conditions on a heavy truck ride comfort are respectively analyzed through the values of the root mean square of acceleration responses of the vertical cab, pitch and roll angles of cab (awc, awphi and awteta). The analysis results indicate that the survey conditions have a great influence on vehicle ride comfort. Especially, the values of awc, awphi and awteta with the poor road surface condition respectively reduce by 43.1%, 45.9% and 61.8% compared to the very poor road surface condition at vehicle speed of 30 km/h and full load.
Vehicle vibration calculations play significant and extremely important role, and is based mainly help to assess the stability, vertical dynamic safe, smooth during vehicle’s operation. Full car vibration simulation model (3D) is used to conduct research. The required parameters are determined on the available SYM T880 car. Calculation results are analyzed in both time and frequency domain, helping more comprehensive assessment of vertical dynamic characteristics of T880 truck in particular as well as the basis of reference to conduct model, vibration evaluation of other kind of vehicles, contribute to improving the quality of vehicle design is more comfortable and safer.
The vibrating behavior of multiple DOF vehicle systems is very much dependent to their natural frequencies and mode shapes. These characteristics can be determined by solving an eigenvalue and an eigenvector problem. The kinetic energy, potential energy, and dissipation function of the system was defined by quadratures and the equations of motion were derived by applying the Lagrange method. Numerical example was calculated. The results show that the method is correct and it lay a good foundation for further research on vehicle vibration.
Effect of operating conditions on a heavy truck ride comfort with hydro-pneumatic suspension system