A New Approach To Approximate Function Synthesis Of Planar Six-bar Dual-dwell Mechanism

Embarking from the actual project,A new approach of approximate function synthesis for planar six-bar dual-dwell mechanism is presented in the dissertation.for the sake of the research,a lot of theory and technology was adopted.The variables are reduced through selecting all dimensions of four-bar mechanism in advance by means of analyzing the demands and atlas of four-bar linkage coupler curves. The coupler curves of planar four-bar mechanism are evaluated first to reduce the cost of searching. If certain criterions are satisfied, the optimization will continue to search for the dyad to finish the approximate functional synthesis of six-bar mechanism, by this way,The error of one six-bar mechanism corresponding to one point of the plane of the four-bar mechanism was gained.searching the plane of the four-bar mechanism,when the minimal error was finded, the corresponding optimal six-bar mechanis will get too. The error was considered not only dwell part but also not dwell part in the approach.The author analyzes the characteristics of Stephenson III planar six-bar mechanisms and the mathematical optimization model is presented, the approximate synthesis of planar six -bar dua-dwell mechanism in the dissertation is decomposed into two sub-questions, different methods was adopted to solve the saddle-point model with inequality constraints and the dyad model with multi-max value including maximum entropy, Rockfellar, BFGS, genetic algorithm to ensure the effectiveness of the mathematical mode and global optimization.A mechanism synthesis software is programmed to illustrate the effectiveness of the approach, which includes the synthesis of planar four-bar mechanism and the approximate funtion synthesis of planar six-bar dual-dwell mechanism.