| The 300 MN die hydraulic press was widely used in the fields of military industry, astronavigation and civilian industry. it often make huge hydraulic shock and vibration when it’s work, which often seriously affected the forging equipment production efficiency and the quality of the forging parts. In view of this phenomenon,this paper launches the system to optimize the structure of 300 MN hydraulic press. And on this base, using the method of multidisciplinary simulation technology to combine MTALAB with AMESim for the simulation research of the hydraulic impact when the 300 MN hydraulic press each working condition works and the various hydraulic impact influence factors. The main purpose of the research work is to explore the method to reduce the hydraulic impact, improve the security, reliability and stability of the 300 MN hydraulic press when it system work. The detail contents are summarized as following:(1)Based on the 300 MN hydraulic press’ s working environment and conditions. Put forward a parallel tertiary structure of electro-hydraulic servo cartridge valves and its flow distribution control program, use this valve to replace the original distribution system distribution valve, so to achieve the optimization of the 300 MN hydraulic press water distribution system, and using multi-disciplinary co-simulation technology for the static and dynamic characteristics of the valve simulation study by combine MATLAB with AMESim.The simulation results show that the valve output huge flow at the same time it also has the high dynamic response.(2)According to the principle of 300 MN hydraulic press each work working condition, point out that it mainly through control the different water valve opening and closing order to complete its work. Established the mathematical theory model when it each working condition work and the opening and closing control function of each valve. Using Multi-disciplinary co-simulation technology to simulate the hydraulic impact phenomenon of the 300 MN hydraulic press each working conditions work which in the new water distribution system. The simulation results was coincided with the actual, it proved truth and reliability of the simulation, so it provide the corresponding theoretical guidance to improve the condition of the system hydraulic impact.(3)Analyzed the mechanism of system hydraulic impact, obtain the corresponding impact parameters, by setting different simulation parameters to simulate the hydraulic impact phenomenon of the 300 MN hydraulic press each working conditions work, The influence law of various parameters on the system hydraulic impact are obtained. The simulation results show that extend the valve opening and closing time, reduce the air content in working medium, increase the length of the line and increase the valve opening amount of the valve port could effectively reduce the hydraulic shock occurring in the system. The simulation results can provide a reasonable theoretical guidance for the system optimization which could reducing the hydraulic impact when system work.(4)The activity crossbeam as the main working parts of the 300 MN hydraulic press, its massive and structure complex. It will have a great impact on system produces hydraulic shock and vibration. Firstly, proposed a multi-objective optimization design method which based on the response surface method, the simulation experiments data were obtained by using the central composite design. A second order polynomial response surface model was established which could reflect the performance indicators of the 300 MN hydraulic press activity crossbeam, and using the evaluation index2 R and 2aR to evaluate the accuracy of the established response surface model fitting. In the end using the quality and the inherent frequency of the activity crossbeam as the optimization goal, stress as the constraint, Using multi-objective genetic algorithm for multi-objective optimization. The results show that based on the well dynamic characteristics, the activity crossbeam also has a lightweight structure... |
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