The results of flexible multibody tracked vehicle simulation are compared with experimental acceleration data. The planar vehicle model used in this investigation consists of fifty-four bodies. The track is represented as a closed kinematic chain that consists of forty-two rigid links connected by revolute joints and deformable joint. The chassis flexibility is described using a set of experimentally identified modal parameters. A method for the determination of contact coefficients of tracked vehicle is presented. The stiffness coefficients are estimated from vibration characteristic of simple two-degree of freedom model. To avoid unreasonable low frequency resonance, the stiffness coefficients are determined as reasonably 'stiff value. Using such coefficients, in the case of flexible body, the peak frequency patterns of the results of accelerations are close to experimental data. In the case of rigid body, obtained results are not close to the experimental ones. To improve the closeness of the calculated and the experimental results, one method is to reduce the stiffness. As reducing the stiffness, track links tend to incline by the force of lower rollers and ground. Consequently, the excitation from the track is becoming large. It is assumed that physical meaning of reducing the stiffness is to concentrate unknown factors, for example small irregularity of the ground surface and track link deformation, to the stiffness coefficients.
Comparison between flexible multibody tracked vehicle simulation and experimental data
2001
8 Seiten, 16 Bilder, 18 Quellen
Aufsatz (Konferenz)
Englisch
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