基于动态插值自适应方法的时变轴系纵向振动主动控制

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摘要推力轴承纵向刚度随转速变化的特性使推进轴系成为动态特性时变的系统。针对时变轴系纵向振动控制问题，提出动态插值自适应控制方法。首先建立推进轴系耦合振动模型，由频域方程得到控制通道和干扰通道的频响函数, 其次建立动态插值自适应控制方法，通过插值算法动态拟合时变补偿器模型，消除时变动态特性对纵向振动控制算法稳定性的影响。为验证控制方法的有效性，分别对有、无插值的自适应控制方法进行数值仿真，仿真结果表明，动态插值自适应控制方法能有效控制推力轴承纵向振动，避免了无插值自适应控制系统的发散；在不同转速稳态运行下，有插值的控制方法能够极大地抑制推力轴承纵向振动，控制后振动加速度幅值小于无控制条件下的1/20。

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	郑洪波1
	覃会1
	胡芳2
	张志谊1
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关键词 ：轴系纵振, 主动控制, 动态插值自适应算法

Abstract：The longitudinal stiffness of thrust bearings varies with shaft speed to lead to a propulsion shafting system has time-varying dynamic characteristics.Here, the dynamic interpolation adaptive method was proposed to control longitudinal vibrations of a time-varying shafting system.Firstly, a coupled vibration model for a propulsion shafting system was established, and frequency response functions of the control channel and the disturbance channel were obtained from frequency domain equations.Then, the dynamic interpolation adaptive method was used to dynamically fit the time-varying compensator model with interpolation algorithm and eliminate influences of time-varying characteristics on the stability of the vibration control algorithm.To verify the validity of this control method, numerical simulations were conducted for the adaptive control methods with and without dynamic interpolation, respectively.Simulation results showed that the dynamic interpolation adaptive method can effectively control longitudinal vibrations of thrust bearings to avoid divergence of the adaptive control system without interpolation; under the steady operation at different shaft speeds, the proposed control method can extremely suppress longitudinal vibration of thrust bearings, and the vibration acceleration amplitude after control is smaller than 1/20 of that with no control.

Key words： longitudinal vibration of the shafting system active control dynamic interpolating adaptive algorithm

收稿日期: 2017-02-24 出版日期: 2018-10-28

引用本文:

郑洪波1,覃会1,胡芳2，张志谊1,3. 基于动态插值自适应方法的时变轴系纵向振动主动控制[J]. 振动与冲击, 2018, 37(21): 171-183.
ZHENG Hongbo1, QIN Hui1, HU Fang2, ZHANG Zhiyi1,3. Longitudinal vibration active control for a time-varying shafting-system based on a dynamic interpolation adaptive algorithm. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(21): 171-183.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I21/171

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