Optimization Design Of High-speed Backplane Connector Based On Multi-objective Particle Swarm Optimization Algorithm

In recent years,with the rapid development of the space technology,the big data communication and the supercomputers,the demand for data transmission speed has become more and more high,therefore the high-speed backplane connectors are increasingly used in these field.Since the failure of an electrical connector is mainly due to contact failure,it is necessary to study the reliability of the contact in order to improve the reliability of the high-speed backplane connector.At present,the design of high-speed backplane connector in domestic is mainly in the imitation stage,necessary to optimize the design of the structure.In this paper,an improved multi-objective particle swarm optimization algorithm is used to optimize the structure of a high speed backplane connector.Because of the lack of convergence and diversity of the basic Multi-objective Particle Swarm Optimization(MOPSO),this paper proposes an improved MOPSO called IMOPSO,which is based on the crowding distance multi objective particle swarm optimization algorithm.In this algorithm,a new velocity updating formula is used,the velocity of the particle is limited,and a deleting method based on probability is used to delete the non-dominated solution which is beyond the limit of the external file.The dynamic inertia weight is used in the new speed update formula,which is based on cosine decreasing.The test function experiments results show that the proposed algorithm is better than the MOPSO-CD and the gamultiobj function in term of the generation distance and the diversity index of the non-dominated solution,which explain the effectiveness of the strategy used in IMOPSO.In order to optimize the design of the contact structure,the relationships between the structure and the insertion,the contact resistance need to be analyzed.In this paper,the theoretical model of the insertion force of the male part with the insertion distance was established by the relevant theory.The accuracy of the theoretical model was verified by the experiment of insertion force.At the same time,according to the electrical contact theory,the relationship between contact resistance and structure size was analyzed,and a theoretical model was established.The maximum insertion force of the male part of the original design is 0.358 N,and the contact resistance is 0.991m?.For the electrical connector,the maximum insertion force and the contact resistance are required to be as small as possible.In this paper,it is the objective function,and the relevant structural parameters are chosen as the decision variables eo establish the optimization mathematical model.A set of non-dominated solutions are obtained by the IMOPSO.Since the high-speed backplane connector does not need to be repeatedly inserted,a preferred decision-making strategy(biased towards contact resistance)is used to select an optimal solution for the non-dominated solutions.The maximum insertion force of the optimized design structure is 0.337 N and the contact resistance is 0.935m?,which is smaller than the original design value.Therefore,the optimal design of this paper has improved the reliability of the contact.The research of the high-speed backplane connector contact in this paper improve the maximum insertion force and contact resistance of the contacts,and provide a set of optimal structures for the design of high-speed backplane connectors.