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Truck dynamic simulation model including the flexible frame can be a more accurately description of the vehicle handling and ride. In this paper, an assembly characteristic oriented flexible truck frame dynamic simulation model and its parameters equivalent dynamic identification method were presented. Model parameters, including natural frequencies, moment of inertias, torsional stiffness and damping...
A test platform based on hydro-pneumatic suspension was set up to research the pressure characteristic of damping hole of this kind suspension. A series of experiments on damping holes of different diameters were carried out, and the pressure on both sides of damping holes were recorded. A mathematical model of this platform was established using knowledge of fluid mechanics; various parameters of...
This paper analyzed the structure and principle of a regenerative electromagnetic shock absorber in detail. The innovative shock absorber resembles linear generator in principle and can generate electric power through the relative reciprocating motion between coil assembly and permanent magnet assembly. At the same time, the damping can remove discomfort caused by road roughness. The regenerated electric...
The Discrete Element Method (DEM) is widely used in the simulation of a particle system. The viscoelastic contact models are the most common ones in the DEM simulation. However, these models stills have a few unrealistic behaviors, which will influence the reasonableness and accuracy of the simulation results. A general form of damping coefficient is proposed through dimensional analysis, and the...
Linear-spring dashpot model is one of the major contact models applied to the DEM (discrete element method) simulation of the tumbling ball mills. The model parameters such as stiffness, damping coefficient, coefficient of restitution and coefficient of friction, significantly influence the calculation of contact forces and the selection of the critical time step. However, there is no standard as...
A reasonable mathematical model of semi-active suspension is established based on a quarter vehicle. A fuzzy controller is proposed and its fuzzy rules are deduced using Matlab Fuzzy logic control toolbox. Simulation model for the whole system is completed by means of Matlab/Simulink. The response curves under random road profile excitations of semi-active suspension are given, which are compared...
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