基于动力学响应分析的透平机械多转子轴系虚拟动平衡研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (18) : 8-12.

论文

宾光富1 周伟1 王维民2 李学军1

作者信息 +

Virtual Dynamic Balancing for Turbomachine Shafting with Multi-rotor Based on Dynamic Response Analysis

Bin Guangfu1 Zhou Wei1 Wang Weiming2 Li Xuejun1

Author information +

文章历史 +

摘要

为解决透平机械多转子轴系动平衡需频繁多次启停机的问题，提出一种基于动力学响应分析的多转子轴系无试重虚拟动平衡方法。通过仿真构建与轴系结构尺寸和运行参数相符的有限元模型，分别在各转子平衡配重位置处施加虚拟不平衡激励，进行动力学稳态不平衡响应分析，得到轴系平衡转速下各振动测点处的振动响应值，从而避免需多次启机试重来获取轴系转子配重位置处的加重影响系数，结合实测的轴系不平衡振动基频值，通过矢量计算获得轴系各转子所需的平衡配重。最后通过搭建的四跨五支承透平机械轴系转子模拟实验台，应用该方法开展1200rpm低平衡转速下无试重虚拟动平衡实验，结果表明一次配重平均降幅高达55%，不仅减少了启停机次数，而且可降低因试重不当、测试误差所导致平衡失败概率。该方法还可推广应用到柔性转子轴系的现场动平衡。

Abstract

In order to solve the problem of dynamic balancing needed to be started many times for turbomachine shafting with multi-rotor, a virtual dynamic balancing method without trial weights for multi-rotor shafting based on dynamic response analysis is developed in this paper. According to the shafting structure size and operation parameters, the rotor dynamic finite element model was built by simulation technology. Unbalance excitation was applied in the node of finite element model corresponding to the balancing weighed position of multi-rotor respectively. Vibration response value of each measuring point on the shafting balancing speed can be obtained through the steady-state unbalance response analysis, which can replace through many times starting up trial weights to get the shafting weighted influence coefficient of specific balancing location in the process of field whole-machine dynamic balancing. Then, combined with the initial fundamental frequency response value of the shafting vibration measuring points, the required shafting balancing weighted of each rotor can be obtained through the vector calculation. The dynamic balancing experiment at the speed of 1200rpm without trail weights was taken by using the proposed method. The average amplitude reduction was up to 55%. The proposed dynamic balancing method can reduce shutdown times and probability of balancing failure due to the improper trial weight and test error. Moreover, it can also be applied to the field dynamic balancing for large flexible shafting.

导出引用

宾光富1 周伟1 王维民2 李学军1. 基于动力学响应分析的透平机械多转子轴系虚拟动平衡研究[J]. 振动与冲击, 2017, 36(18): 8-12

Bin Guangfu1 Zhou Wei1 Wang Weiming2 Li Xuejun1. Virtual Dynamic Balancing for Turbomachine Shafting with Multi-rotor Based on Dynamic Response Analysis[J]. Journal of Vibration and Shock, 2017, 36(18): 8-12

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