| Abstract: | In this paper,a new type of machinery which can enlarge the stroke of air cylinder is introduced. It is very useful when the original stroke of air cylinder cannot satisfy the work requirement.According to design requirements,its multi-objective mathematic model with constrained conditions is built. In order to solve this model, some methods are discussed and used such as penalty function method,variable metric method,Newton tangent method and bisection method. Based on the optimal result,motion curves of enlarging stroke mechanism are obtained. Results show that the motion characteristic of enlarging stroke of air cylinder mechanism is satisfying. In addition,we also consider the influence of different initial values of link length to optimal results and two important laws are got in this paper on the basis of optimal results. |
