Sensitivity Analysis Method for High Stiffness and Light Weight of Bus Body Frame

Abstract

The invention relates to a high-rigidity and light-weight sensitivity analysis method for a passenger bus skeleton and belongs to the field of design of a passenger bus body. The method comprises the steps of parameterization assembly modeling of a passenger bus skeleton structure, static and dynamic rigidity defining and sensitivity analysis of the static and dynamic rigidity on the whole bus weight. The method is different from other rigidity and sensitivity analysis methods on the other bus body structures; the static and dynamic rigidity sensitivity of the method is the derivative of the whole bus weight, the bus body weight is reduced while the rigidity is increased and the light weight target is realized; in the traditional method, the static and dynamic rigidity is subjected to differentiation for the section size, and the bus body rigidity is improved while the bus body weight is not reduced. In addition, the invention adopts the adjoint variable sensitivity analysis method, and the calculated amount is greatly reduced, so a large-sized passenger bus body can be designed and the method has important guide action for the design technology of the passenger bus body.

Description

technical field [0001] The present invention relates to the field of passenger car body design, in particular to a high stiffness and light weight sensitivity analysis method of the passenger car body frame, which is mainly used to determine the geometric dimensions of the passenger car box girder section, so as to realize the goal of lightweight and high rigidity of the passenger car body frame structure . Background technique [0002] With the continuous increase of my country's economic aggregate, the state has invested heavily in the field of public transportation to improve people's livelihood. At the same time, the emission of automobile exhaust has caused serious pollution to the atmospheric environment. Therefore, the task of energy saving and emission reduction in the passenger car industry is quite arduous, which requires the innovation of passenger car design technology. The lightweight technology of the bus body is one of the feasible solutions: that is, on the...

AI Technical Summary

Problems solved by technology

In the traditional parametric modeling of the bus frame, each beam structure is matched with a set of independent section geometric parameters. The design method is to calculate the derivative of the static and dynamic stiffness with respect to the section size parameters, which can only increase the body stiffness but not reduce the body weight.

The traditional stiffness sensitivity analysis method of passenger cars basically adopts the difference method, and the difference step size will cause calculation errors. What is more serious is that the calculation amount is huge, which affects the design cycle of the body structure.

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