Multi-Object Conceptual Design Based On Hierarchical Coding Genetic Algorithm

Conceptual design is widely used in engineering designing. It accelerates the course of automation availably and influences the development of industurty. The design method determines the speed of designing and producting. How to improve the design method for improving the quality of products is concerned intensively.In this thesis, Hierarchical-Coding-Genetic-Algorithm is presented for application in Mechatronics products conceptual design.The main content of this thesis is as follows:1. The genotype knowledge model is discussed. The function tree by the function decomposition of the design product is formed. And the structure tree is got according to the corresponding retationship of function to structure.2. The method of colding is proposed. Each gene in the structure tree is descripted using forgoing description method. The hierarchical structures of machine system designs are exactly expressed through genotype coding, and optimization can be concurrently conducted for all of the hierarchical structures.3. Crossover and mutation operations for manipulating the hierarchical genotype representations are also developed.4. Get the multi-object optimization model by its orders.5. Demonstrate the algorithm of HCGA using an simple numerical experiment by MATLAB.All of the conclusions stated above are drawn from the results of simulation of a motor-brace-rocher mechanism design. The mathematical models of multi-object optimization structure design are provided. The proposed method is applied to a motor-brace-rocher mechanism design to demonstrate its effectiveness.