多锤联动系统的振动耦合理论及试验研究
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- 发布时间:2014-03-22
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针对多锤联动时出现耦合问题,对"锤―桩―土"系统进行合理简化,在此基础上以两台桩锤联动为对象建立打桩过程中的动力学数学模型,并由此构建系统的机电耦合方程,然后利用小参数周期平均法对机电耦合过程中电动机的负载转矩进行近似解析,得出系统运行过程中电动机负载转矩的影响因素、平衡方程及机电耦合强度表达式,揭示系统出现耦合现象的机理。利用Matlab/Simulink建立仿真模型并对系统机电耦合过程进行数值仿真,得到系统在不同电动机转速、初始相位差及土壤参数下的机电耦合过程及基本规律。最后通过实际打桩试验验证数学模型、理论推导及仿真结果的正确性。这些结论为电控联动方式的控制策略制定提供理论依据,也为机械联动结构设计及"机械―电控"复合联动方式的工程应用提供参考。 The "hammer-pile-soil" system is simplified in a proper way due to coupling phenomena in joint vibration of multi hammers,the dynamics model and electromechanical coupling equations of the two joint piling vibration hammers are established.On that basis,small parameter cycle average method is used to perform the approximate analysis of the motor load torque during the coupling process,through which the influence factors of motor load torque,balance equations and coupling degree expression are obtained and mechanism of coupling phenomena is revealed.Matlab/Simulink is used to set up the model and perform the mathematical simulation of the electromechanical coupling process to obtain the basic principle of the electromechanical coupling process in different motor speed,initial phase difference and soil parameters.At last,the validity of the mathematical model,theory deductions and simulation results are verified by piling experiments in practice.These conclusions provide theory guidance in planning a control strategy of electrical joint vibration;also provide reference for the "mechanical―electrical" composite joint style and the structure design of the mechanical joint.
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