Study On Ride Comfort Optimization Of The SF33900-type Mine Dump Truck Based On Loam Road

Ride comfort is one of the important performances of mining dump truck. It notonly affects passengers’ ride comfort, but also affects the working life of auto parts,the dynamical and economical performances of mining dump truck. So, it isnecessary to seriously study and optimize ride comfort of mine dump. This makes itsucceed more easily in the competitive market of same kind of vehicles. At present,ride comfort research is mostly based on the assumption of rigid road. However,ground deformation has a significant impact on the ride comfort of those off-roadand heavy-duty engineering vehicles. So, model of vehicle-terrain coupling systemunder the condition of deformable terrain was completed and increased simulationaccuracy. The above situations may be improved by using a new type of nonlinearhydro-pneumatic suspension, which can improve ride comfort. Therefore, thehydro-pneumatic suspension was numerically simulated by using VOF and adaptivedynamic grid technology. Then, the hydro-pneumatic suspension height and dampingholes and seat parameters were optimized design, and ride comfort was improved.These have important theory significance and practical value.Selecting the mining dump truck (SF33900) as the research object, this paperbuilt the vehicle-terrain coupling model. Referring to the entire truck riding comfortexperiment and taking ride comfort as optimization objective, the ideal suspensionand seat parameters were figured out through the optimization of the suspensionsystem under different vehicle speeds. Main contents of this paper are as follows:1、Acceleration value of each testing positions were obtained by making theexperiment of entire truck riding comfort. The nonlinear stiffness and dampingcurves of hydro-pneumatic suspension system were developed, making use ofDaubechies wavelet’s compactness and regularization and least-square method. Atlast, the identification results were verified by using multi-body dynamicssimulation software ADAMS/View.2、 Pressure of each body was obtained by numerically simulation ofhydro-pneumatic suspension fluent model, which is combined VOF and adaptivedynamic grid technology. Then, the nonlinear stiffness and damping curves ofhydro-pneumatic suspension system were developed and verified by comparing withidentification results. Meanwhile, this paper analyzed the affect of different gas height and damping hole diameter on stiffness and damping characters ofhydro-pneumatic suspension.3、Model of vehicle-terrain coupling system was modeled and simulated byusing ADAMS/Matlab co-simulation technology. The simulation accuracy of thismodel is increased by comparing with ride comfort simulation of rigid pavement.4、Based on the study of the vehicle ride comfort research, this paper introducedmodern optimization algorithm to suspension parameters and seat stiffness design,and a set of optimal parameters were obtained. The simulation results show that: theroot mean square value of the seat acceleration was greatly brought down ondifferent conditions, and maximum achieved18.6%, and minimum also had15.4%,so the vehicle ride comfort can be significantly improved.