Abstract: Because simulated annealing algorithm is based on random searching and adequately high temperature, the convergence speed is very slow. In order to adapt to the optimization of the complex mechanical products, a new simplex method is presented. Then the simulated annealing algorithm is improved by using the new method. Not only the improved simulated algorithm can jump out of local optimal solution, but also it can search for globe optimal solution in ideal direction. As a result, it speeds convergence. And, an information model for optimal design is presented. Then, corresponding computer programs are developed. The techniques are successfully used for pumping unit.

Key words: annealing, Optimal design, Simplex method, Simulated