Abstract
The paper deals with the analysis of vehicle vibrations in the time domain. The main aim is to modify the HHT-method for the solution of mechanical systems with nonlinear members. The modification enables the computation with the constant system computational matrix. This causes that the triangulation is to be performed once only and the nonlinear members affect only the right side of the algebraic equations system. This can dramatically decrease the time consumption of the computation. We used the method modified in this way for the dynamic analysis of the model with the parameters of the specimen "ERRI - vehicle" that was kinematically excited.
Highlights
A vehicle mechanical system is excited with various types of loads in the operation and this is the reason why its individual parts oscillate
All the computations in the time domain were performed by the HHT method which was modified for nonlinear members with the following parameters γ ϭ 0.15, αm ϭ 0.15 and Δt ϭ 0.005 sec. computation
Test of modified HHT-method For this method validation we used the comparison of computer evaluated dependence courses of forces and velocities, or Simulation computations mainly supported by computational technique are used for the vehicle vibration analysis
Summary
The analysis of mechanical systems (for example mechanical systems of vehicles) vibration is permanently very topical. A vehicle mechanical system is excited with various types of loads in the operation and this is the reason why its individual parts oscillate. The aim of a dynamical analysis is to judge the influence of an excitation on the mechanical system and, on the base of that analysis, to propose and to perform construction changes of a vehicle for the detected negative state elimination or improvement. The direct numerical integration of the equation of motion is widely used for the linear systems solutions where the individual process character monitoring is important. The principal idea of a numerical integration lies in the fact that we will fulfil the equation of motion in the finite t0, t1, ..., tm moments. We consider the start to be the time t ϭ 0.
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