Structural Optimization Of The Frame Of SF35100Type Mining Dump Truck

The frame of large-tonnage electric wheel mining dump truck is considered as the main load-bearing component of mining dump truck, while its structure and the weight directly affects the vehicle’s performance and life. On the basis of weight loss, the improvement of the stiffness, low frequency and strength of SF35100type mining dump truck has very important significance on the performance of the vehicle.Based on the theory of mathematical programming, structure optimization technology employs optimization method and CAE tools to obtain the best distribution scheme of material in the design space, considering the various design constraints. In recent years, the topology optimization structure is a frontier and hot issue in the field of optimization research, as well as an important and difficult part in structural optimization.This paper mainly focuses on structural optimization design of frame of SF35100type mining dump truck. It includes:1. Based on dynamic simulation analysis to obtain the load of several kinds of typical extreme working conditions, the strength of this frame was checked by means of finite element analysis to judge whether the safety factor of the frame was in a reasonable range or not.2. Using OptiStruct software to implement structural topology optimization design for dump truck frame, the mathematical model of multi-objective topology optimization was built, which considered the frame stiffness and low-order vibration frequency as objective function. The optimized result could meet the stiffness requirement and the requirement of low frequency vibration. Comparing the theoretical analysis and simulation analysis results, it showed that the optimized dump truck frame was reasonable, which testified that the topology optimization method was feasible and effective and provided a new train of thought for frame structure optimization design.3. On the basis of re-designed frame from topology optimization, the thickness of thin-wall components of frame was considered as design variables, and the lightweight of frame was considered as objective. The size optimization model was established to satisfy the requirement of stiffness and frequency index. Finally, comparing the new frame and the primary frame, it verified that this optimization design method had certain feasibility in engineering problems. Through the study of this article, one feasible and effective CAE analysis method for frame was obtained. This method combined finite element analysis, multi-body dynamics simulation analysis with structure optimization design, which had a strong guiding significance to the development and innovation for mining dump truck. Some analysis data accumulated in this study could provide some help in the future, as well as for corresponding engineering analysis applications.