Effect of operating conditions on a heavy truck ride comfort with hydro-pneumatic suspension system

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.

Vibration analysis of a light truck by 3d dynamic vehicle vibration model

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.

Development and evaluation of full-vehicle vibration model of MF 285 tractor

The vibration transmitted to the tractor driver not only leads to the driver health problems, but also reduces the driver working efficiency. One of the methods utilized to reduce driver vibration is the seat suspension system. Development of the tractor vibration model is the first step toward the implementation of the tractor seat suspension. In this research development and evaluation of full-vehicle vibration model of MF 285 tractor was considered. At validation phase, the developed model simulated the predictable outputs correctly. The modified parameters of the model reduced the simulation error by 30% compared to the model with primary parameters. Furthermore, considering the operation status of tractor engine in the simulated tractor, the simulation error was reduced from 45% to 27%.

Development of Electronic Control Unit for Air Suspension with Fuzzy Control

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.

Five DOF Pneumatic Vehicle Vibration Model and Stability Analysis

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 .

Study of Vehicle Vibration Model Based on Lagrange Method

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.