To research the mechanical performance and vibration modes of current longitudinal thrust rod of rear axle, the finite element model of original thrust rod is established and analyzed with NASTRAN codes. The simulation results demonstrate: the maximum stress of original thrust rod of dump truck is in the limit of the yield strength of material, which satisfies with the design requirements; the first step modal frequency of the component under free conditions is greater than upper limits value of the excited frequency of roads, which can evade the resonance excited by irregular roads. But there is structural stress concentration area in the thrust rod, so the structure of thrust rod is modified to ameliorate the stress state of this area. The maximum structural stress is reduced by 35.1% on the basis of reduction by 4.7% in total weight, which indicates the modification improves the mechanical and modal performance greatly. The research above has significant reference values for mechanical performance analysis and lightweight design of complicated automotive components.
A rolling horizon framework for the dynamic assignment and sequencing of trucks to jobs consisting of picking up and delivering full truckloads when requests for service arise on a continuous basis. A mathematical formulation of the problem faced at each stage is presented; its solution allows for the dynamic reassignment of trucks to loads. Loads have associated time windows for pickup and delivery, and the objective function includes explicit penalty cost for not serving a particular load. A solution algorithm is presented and implemented, and computational results are presented.
The shock absorber model and front beam model of a domestic car are built using UG according to the existing two-dimensional drawings. And they are assembled together with the rear beam model, steering knuckles model and arm model. The ADAMS software is used to build up an assembled vehicle model, which includes front and rear suspensions, chassis, steering, tires subsystems and so on. Response characteristics of vehicle ride comfort under pulse road surface are studied through simulation.
A problem in which a given good has to be delivered from some origins to some destinations by means of a given fleet of trucks at minimum cost is discussed. For the purpose of solution the problem is split into two levels: the decision concerns the planning of trips and the vehicles needed to operate the trips have to be scheduled. The solution approach based on Lagrangean Decomposition is presented.
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