Homing type topological optimization method for mortise and tenon joint structure design

Abstract

The invention discloses a homing type topological optimization method for mortise and tenon joint structure design. The homing type topological optimization method specifically comprises the followingsteps: step 1, establishing a finite element model of a to-be-optimized structure; step 2, selecting an area where a mortise (1) and a tenon (2) are located as a design domain; step 3, selecting a basic unit, and determining basic structural forms of the tenon (2) and the mortise (1); step 4, running primary finite element analysis; step 5, filtering and leveling the unit strain energy calculatedin the step 4; step 6, enabling the basic unit and the amplification unit to carry out amplification; step 7, calculating the neighborhood state of each unit in the design domain; step 8, setting local control parameters and constructing a local control rule; step 9, performing convergence judgment; and step 10, analyzing and evaluating an optimization result. According to the method, by changingthe basic shape form of the mutually matched and connected parts in the mortise and tenon joint structure, optimization can be conducted within a large range, and then the force transmission path ofthe mortise and tenon joint structure is optimized.

Description

technical field [0001] The invention relates to a topology optimization method, in particular to an optimal design method for assembled parts, butt joint parts, mortise and tenon structures or other structures that rely on the shape of the structure itself for mutual support, positioning and force transmission. Background technique [0002] With the development of engineering technology, thanks to the improvement of machining accuracy and the upgrading of assembly technology, combined and docking parts have been increasingly used in mechanical parts due to their high assembly efficiency and stable connection performance. In the design of joint parts, such as mortise and tenon structure, it is not limited to the application of traditional wooden structures, but has been adopted in a wider range of fields such as mechanical structure design and manufacture. In this context, the optimization of this fast connection structure has important practical significance. [0003] At pr...

AI Technical Summary

Problems solved by technology

This method requires preset shape variables, and the direction and range of shape changes are limited, so that the optimization process depends too much on the topology and shape of the initial structure, and it is impossible to give inspiring new structural forms

Therefore, this method can only be used to improve stress concentration, optimize contact conditions, etc., but cannot change the force transmission path of the structure

[0004] Although topology optimization technology can give new structural forms with enlightening significance, conventional topology optimization technology, no matter variable density method, progressive structure optimization method, cellular automata method or level set method, can only be applied to a single flexible The optimization of the body is characterized by the fact that the boundary conditions of the structure are unchanged or only slightly and regularly change during the optimization iteration, so it cannot be applied to the situation where the boundary conditions change drastically in optimization problems such as tenon joint structures.

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