Method for carrying out structural topological parameter optimization on nonlinear dynamic systems of high-speed light-load mechanisms

Abstract

The invention discloses a method for carrying out structural topological parameter optimization on nonlinear dynamic systems of high-speed light-load mechanisms. According to the method, the iteration of linear structure optimization in an ESLM (equivalent static loads method) is restricted as single modification, so that the change of inertial load caused by structure modification is immediately reflected in an optimization model; in allusion to the problem that the a topological structure tending to 0 or 1 cannot be obtained through the single modification, topological parameter (topometry) optimization is directly carried out on the thickness, or the penalty function (the punishment factor P is set as 1) of a topological optimization variable density method is cancelled, and the optimization result is converted into an equivalent thickness, so that the topological parameter optimization of the high-speed light-load mechanisms on the basis of the singly modified ESLM is realized. According to the method, the equivalent load is considered as a function of a design variable, the optimization model is reconstructed, and a corresponding solving method is proposed, so that the residual amplitude is reduced as much as possible while the optimization condition is satisfied, compared with the standard equivalent static load, the amplitude under the same movement condition can be reduced by a half, and the performance of the high-speed light-load mechanisms can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of structural optimization design of mechanical components, and in particular relates to a method for optimizing topology 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 can be consid...

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Problems solved by technology

[0031] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a high-speed light-load mechanism nonlinear dynamic system structure topology parameter optimization method to solve the problem that the existing method ignores the influence of inertial loads in the structure optimization process and cannot adapt to high-speed Problems with light-loaded mechanisms

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