Analytical and experimental research on impact load during rapid engagement of gas turbine
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摘要:
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。 Abstract: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. -
图 1 SSS离合器的机械结构及基本原理图
A-棘爪；B-啮合齿轮；C-中间件；D-螺旋花键轴；E-主动件；F-从动件；G-棘轮
Figure 1. Mechanical structure and basic principle of SSS clutch
图 9 不同Min和ωr下的冲击扭矩响应幅值
Figure 9. Amplitude of torque response under different Min and ωr
表 1 主动端轴系的动力学模型参数
Table 1. Parameters of active side of dynamic model
部件名称 惯量/(kg·cm2) 刚度/(kN·m·rad−1) 内阻尼系数 并入机转子 15 825.06 78.20 0.064 惯量盘 23 078.54 326.29 0.064 离合器主动件 9 954 − − 
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表 2 从动端轴系的动力学模型参数
Table 2. Parameters of driven side of dynamic model
部件名称 惯量/(kg·cm2) 刚度/(kN·m·rad−1) 内阻尼系数 离合器从动件 31 377.86 46.45 0.064 小齿轮 8 616.855 − − 大齿轮 245 749.7 49.35 0.064 负载机转子 55 446.19 − − 小齿轮（分支1） 6 218.73 71.79 0.064 惯量盘（分支1） 26 697.27 78.20 0.064 工作机转子（分支1） 15 825.06 − −
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表 3 双机并车台架的主要参数
Table 3. Main parameters of double engine parallel platform
设备名称 主要参数 数值 驱动电机 额定功率/ kW 4 最大转速/(r·min−1) 4 000 负载电机 额定功率/ kW 10 最大转速/(r·min−1) 2 000 SSS离合器 额定扭矩/( N·m) 200 并车齿轮箱 速比 3∶1 扭矩仪 采样率/ Hz 1 000
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