High speed light-load mechanism nonlinear dynamic system structure evolution optimization method

Abstract

The invention discloses a high speed light-load mechanism nonlinear dynamic system structure evolution optimization method. The method aims at a nonlinear kinetic analysis to directly calculate sensitivity information of element strain energy and directly obtain the element strain energy at each time point, the strain energy at all the time points is superposed after normalization processing, the comprehensive sensitivity for measuring all discrete points is obtained, structure modification is performed by adopting an evolutionary structural method, then the structure is updated, the nonlinear analysis is performed again, and the process is repeated until an optimal object is realized. According to the method disclosed by the invention, the equivalent load calculation is omitted, and the change on inertial load by structural modification is directly reflected into a model to obtain a more optimal optimization result. According to the method disclosed by the invention, the equivalent static load is considered as a function of a design variable, and a corresponding calculation method is proposed, compared with a standard equivalent static load, the amplitude in the same movement condition can be lowered by half, and the performance of the high speed light-load mechanism is 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 structural evolution optimization of a nonlinear dynamic system 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 considered as...

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Problems solved by technology

[0034] 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 evolution optimization method to solve the problem that the existing method ignores the influence of inertial loads in the structure optimization process and cannot be adapted to high-speed light-load mechanisms. Loading agency issues

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