Research On Theory Of Continuum Structural Topology Optimization And Its Application In Turret Structure Design

Continuum structural topology optimization is one of the major subjects in structural optimization field. Comparing with traditional size and shape optimization, topology optimization is at the phase of structural concept design, and result of it is foundation for succeeding design, therefore, structural topology optimization can obtain more economic profit, and is more important to engineering design. In this thesis, continuum structural topology optimization methods based on density method,evolutionary structural optimization and multi-island genetic algorithm are studied respectively, develop the program of topology optimization and user graphic interface based on software ANSYS; dynamic analysis and optimization of some self-propelled howitzer turret is done, and the bracket body is optimized with topology optimization method, in order to realize the light-weight design of turret body.Main contents of this thesis include:1,Deduce the topology optimization algorithms under structure volume constraint and stiffness constraint based on density method and OC method respectively; put forward a new filter algorithm, eliminate the checkerboard and mesh-dependence problem in continuum topology optimization effectively; develop topology optimization program on the platform of ANSYS software, validate it with typical sample and apply it into continuum structural topology optimization successfully; discuss the effect of parameters to the result;2,Study the ESO and BESO method based on structure stress and strain energy; bring forward an improved sensitivity algorithm after analyzing error caused by the original algorithm in traditional ESO; put forward an evolutionary structural optimization method based on adaptive parmeters to solve the problem caused by parameters choosing;3,Apply multi-island genetic algorithm into continuum structural topology optimization, contrast of result from SGA and MIGA is done with typical sample, result shows that the continuum structural topology optimization based on MIGA can produce better global optimization solution with the same parameters;4,Develop the topology optimization program based on density method,bi-directional evolutionary structural optimization and multi-island genetic algorithm respectively with APDL, enlarge the function of topology optimization in ANSYS, and realized the user graphic interface design with UIDL;5,Apply the topology optimization method into cabin design of some truck-mounted howitzer and body structural optimization design of some patrol vehicle, realize virtual design and improvement of sample vehicle with the finite element method, avoid blindness in traditional design method and enhance the effectiveness;6,Analyze the dynamic response characteristics of some turret body during firing, optimization of body wall thickness is done based on the multi-island genetic algorithm with the purpose of light-weight design, and the weight reduced by 10.01%; topology optimization of turret body bracket is done, and bracket model is built referring to the optimization result, result shows that weight of the bracket body reduced by 23.9% after optimization, under the condition of satisfying the structure stiffness constraint.