Realization Of Evolutionary Topology Otpimization And Its Application On Lightweight Design Of Concrete Bom Pump Turck

Structural topology optimization is the focus in the current research field of structural optimization. Compared to size optimization and shape optimization, structural topology optimization can not only obtain greater economic benefit but also is more appealing to engineering designers. The structural topology optimization of continuum is considered as one of the difficulties in the current research field of structural optimization due to its large amount of design variables and numerical calculation. Therefore, the structural topology optimization research is of great important theoretical significance and prospect in engineering application. In this paper, programs of evolutionary structural optimization and bi-directional evolutionary structural optimization have been developed on the platform of large common software—Ansys and also verified by classical examples. Aiming at the multi-point optimization problem in engineering practice, bi-directional evolutionary structural optimization and multilevel optimization technique have been combined to form a new optimization method which is proved to be feasible and efficient by examples. The bi-directional evolutionary structural optimization is applied to architecture and mechanical field for the first time, while the lightweight of pump truck outrigger in the single loading case and derricking cylinder under multiple loading conditions are successfully realized through the developed program. The main research contents include:1,Program development(1) On the basis of basic idea of evolutionary structural optimization, program of evolutionary structural optimization based on element stress level and strain energy level is developed combined with the characteristics of APDL language. Correctness of this program is proved by classical examples, while the numerical instability problem exists in evolutionary structural optimization is also explained by examples as well.(2) Absorbing and digesting the latest idea of bi-directional evolutionary structural optimization, according to the demand of engineering practice, the program of bi-directional evolutionary structural optimization based on stress constraints is developed on the basis of evolutionary structural optimization.(3) Combining the multilevel optimization technique and employing the piecewise implementation ways, a new method for optimization problem under multiple loading conditions is realized through programming.1,Realization of practical lightweight of complex structure(1) The boundary conditions of outrigger are reasonably simplified on the premise of taking full consideration of outrigger bearing, while the optimization for outrigger under two kinds of boundary conditions caused by possible machining error is implemented by utilizing the developed program. Results showed that the constraints conditions of end have little influence to the optimization of outrigger web. After the formation adjusting to optimization results, the structural analysis revealed that the structure after adjustment can not only reduce the weight but also satisfy the mechanical requirements for the outrigger operation.(2) Three-dimensional optimizations for derricking cylinder under tension and pressure conditions are respectively completed through modifying the developed tow-dimension program. On the basis of optimization results under compression and one load conditions, the optimization problems of derricking cylinder under stress constraints and multiple loading conditions are well solved by introducing multilevel optimization technique, which shown that the combination of bi-directional evolutionary structural optimization and multilevel optimization technique for multiple loading conditions problem resolution is feasible and efficient.