Hybrid optimization method for structural topology parameters of nonlinear dynamic system of high-speed light-load mechanism

Abstract

The invention discloses a topological parameter hybrid optimization method for a nonlinear dynamic system structure of a high-speed light load mechanism. According to the method, a linear structure optimization iteration of a standard ESLM (equivalent static loads method) is defined into a single modification, so that a change of an inertial load caused by a structure modification is immediately reflected into an optimization model; a structure with the minimal equivalent load change is obtained; and aiming at a problem that a topological structure tending to 0 or 1 cannot be obtained by the single modification, the standard ESLM is further introduced to obtain a clear topological optimization structure, so that the hybrid optimization of the high-speed light load mechanism on the basis of a single or maximum iteration ESLM is achieved. According to the topological parameter hybrid optimization method, equivalent loads are considered into a function of a design variable; the optimization model is reconstructed; a corresponding determining method is provided; the residual amplitude can be lowered to the maximal extent under the condition of meeting optimization conditions; compared with standard equivalent static loads, the amplitude under the same motion condition can be lowered by a half; the properties of the high-speed light load mechanism are greatly improved; and different design requirements of the high-speed light load mechanism are met.

Description

technical field [0001] The invention belongs to the technical field of structural optimization design of mechanical components, and in particular relates to a hybrid optimization method for topological parameters of a nonlinear dynamic system structure of a high-speed light-load mechanism. Background technique [0002] The precision movement of high-speed mechanism mainly involves two indexes of movement speed and movement precision. Among them, for high-speed mechanisms, when the motion acceleration reaches a certain level, the dynamic characteristics of the mechanism will change greatly, that is, the mechanism will show a "flexible" characteristic, which will lead to a high degree of nonlinearity of the mechanism under these working conditions , which brings great difficulties to the follow-up dynamic analysis and optimization of the mechanism. [0003] When the mechanism moves at high speed, the rigid body motion and elastic vibration are coupled with each other, which c...

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Problems solved by technology

[0035] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a hybrid optimization method for the structural topology parameters of the nonlinear dynamic system of the high-speed light-load mechanism, so as to solve the problem that the existing method ignores the influence of the inertial load in the structural optimization process and cannot be adapted to Problems with high-speed light-load mechanisms

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