燃机快速并车过程的冲击载荷特性分析及实验研究

Analytical and experimental research on impact load during rapid engagement of gas turbine

[目的]为了获取燃燃联合动力(COGAG)装置在快速并车解列过程中的冲击载荷及轴系动态响应,提出一种理论计算方法。[方法]根据同步自动换挡(SSS)离合器啮合过程中各部件的力学关系,建立离合器的动力学分析模型,并开展燃燃联合动力装置并车过程的动力学仿真和台架实验。[结果]仿真结果表明:在阻尼油腔作用的时刻,离合器螺旋花键上产生了明显的扭矩冲击,同时使离合器两端轴系产生了很强的扭矩动态响应;离合器棘轮棘爪位置的随机性将导致扭矩冲击峰值和轴系动态响应在一定范围内波动。台架实验验证了并车冲击载荷计算方法的正确性,其最大和最小扭矩的响应幅值与理论计算偏差分别为3.56%和8.86%。[结论]对于燃机快速并车过程中的扭矩冲击影响,研究成果可为燃燃联合动力装置的运行安全性评估提供参考。

[Objectives]This paper proposes a theoretical calculation method for obtaining the impact load and dynamic response of shafting during the rapid engagement process of a combined gas turbine and gas turbine(COGAG)power plant.[Methods]According to the mechanical relationships between various components in the meshing process of a synchro-self-shifting(SSS)clutch,a dynamic analysis model of the clutch is established,and the dynamic simulation and bench test during the rapid engagement of COGAG are carried out.[Results]As the simulation results show,when the damping dashpot functions,a significant torque impact occurs on the clutch spiral spline which can result in a strong dynamic response on the shafting.It is also found that the relative position of the ratchet and pawl is random,which can cause the peak torque impact and dynamic response of the shafting to fluctuate within a certain range.Through a power plant experiment,the accuracy of the impact load calculation method and the randomness of the impact amplitude are verified,and the errors of the maximum and minimum torque response amplitudes are 3.56%and 8.86%respectively.[Conclusions]This paper finds that the rapid engagement of COGAG can produce an obvious torque impact which can affect the safety of the power plant.As such,it can provide references for the operation safety evaluation of COGAG power plants.