Suspension system optimisation to reduce whole body vibration exposure on an articulated dump truck

[摘要] In this document the reduced order simulation and optimisation of the passive suspensionsystems of a locally produced forty ton articulated dump truck is discussed. Thelinearization of the suspension parameters were validated using two and three dimensionalMATLAB models. A 24 degree-of-freedom, three dimensional ADAMS/VIEW modelwith linear parameters was developed and compared to measured data as well as withsimulation results from a more complex 50 degree-of-freedom non-linear ADAMS/CARmodel. The ADAMS/VIEW model correlated in some aspects better with the experimentaldata than an existing higher order ADAMS/CAR model and was used in the suspensionsystem optimisation study. The road profile over which the vehicle was to prove itscomfort was generated, from a spatial PSD (Power Spectral Density), to be representativeof a typical haul road. The weighted RMS (Root Mean Squared) and VDV (Vibration DoseValue) values are used in the objective function for the optimisation study. Theoptimisation was performed by four different algorithms and an improvement of 30% inride comfort for the worst axis was achieved on the haul road. The improvement wasrealised by softening the struts and tires and hardening the cab mounts. The results wereverified by simulating the optimised truck on different road surfaces and comparing therelative improvements with the original truck's performance.

[发布机构] Stellenbosch University