Method for optimizing contact force of structure by adopting equivalent static displacement

Abstract

The invention relates to a method for realizing structural contact force optimization by adopting equivalent static displacement, belonging to the field of engineering structure optimization design. The main steps are as follows: firstly, the nonlinear contact analysis of the structure is carried out to obtain the contact force of the joint on the contact surface; secondly, the contact force is applied as a static external load on the node of the original contact surface, and its static displacement is calculated; finally, the static displacement is applied to the node of the contact surface as a constraint of forced displacement, and the constraint reaction force under the linear static condition is optimized. If the optimized structure meets the contact force constraint requirements, theoptimization is stopped, otherwise the above steps are repeated. The invention can rationally optimize the structure involving the contact force and avoid the structural designer from relying excessively on the sensible engineering experience. Compared with the traditional surrogate model method, this method has higher optimization accuracy and less computation, and can be applied to complex engineering problems.

Description

technical field [0001] The invention relates to the field of engineering structure optimization design, in particular to a contact force optimization method, in particular to a method for realizing structure contact force optimization by using equivalent static displacement. Background technique [0002] In order to shorten the design cycle and test cost, computer-aided finite element simulation and optimization technology has been widely used in the field of engineering structure design. However, due to the highly nonlinear contact conditions, it is very difficult to derive the sensitivity of the contact force to the design variables. At present, there is no gradient-based algorithm that can solve the contact force optimization problem. In engineering, the surrogate model method, such as the response surface method, is mostly used to deal with such problems. However, the surrogate model method has low computational accuracy and a large amount of computation for multivariab...

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Problems solved by technology

However, the calculation accuracy of the surrogate model method is low, and for multi-variable optimization, the calculation amount is very large, so the surrogate model method is difficult to deal with the optimization design of complex models

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