电磁轴承支承特性分析及优化调节
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摘要
为了使电磁轴承系统具有更好的悬浮稳定性,同时又能保持良好的支承性能,提出了一种电磁轴承支承特性优化调节的数值解析方法。以电磁轴承支承特性基本理论为基础,从电磁轴承系统稳定性和稳定裕度的角度出发,定量研究了支承特性的调节与系统稳定性的关系,并着重分析了系统时滞对支承特性调节的影响。实验结果表明:通过该优化调节方法调节电磁轴承支承特性,系统转子的振幅较小;加时滞模块的电磁轴承系统功率谱幅值明显大于不加时滞模块的系统。这表明该方法有效,时滞对系统支承特性的调节有阻碍作用。
In order to make the electromagnetic bearing system have better suspension stability and maintain good bearing performance,a numerical analysis method for optimal adjustment of the bearing characteristics of the electromagnetic bearing was proposed.Based on the basic theory of electromagnetic bearing support characteristics,from the perspective of stability and stability margin of electromagnetic bearing system,the relationship between the regulation of support characteristics and system stability was quantitatively studied,and the influence of time delay on the adjustment of supporting characteristics was emphasized.The experimental results show that the rotor amplitude of the system is smaller by adjusting the support characteristics,and the power spectrum amplitude of the system with delay module is obviously larger than that of the system without delay module.This indicates that the method is effective,and the time delay hinders the adjustment of the support characteristics of the system.
In order to make the electromagnetic bearing system have better suspension stability and maintain good bearing performance,a numerical analysis method for optimal adjustment of the bearing characteristics of the electromagnetic bearing was proposed.Based on the basic theory of electromagnetic bearing support characteristics,from the perspective of stability and stability margin of electromagnetic bearing system,the relationship between the regulation of support characteristics and system stability was quantitatively studied,and the influence of time delay on the adjustment of supporting characteristics was emphasized.The experimental results show that the rotor amplitude of the system is smaller by adjusting the support characteristics,and the power spectrum amplitude of the system with delay module is obviously larger than that of the system without delay module.This indicates that the method is effective,and the time delay hinders the adjustment of the support characteristics of the system.
引文
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[2]Zhou J,Di L,Cheng C,et al.A rotor unbalance response based approach to the identification of the closed-loop stiffness and damping coefficients of active magnetic bearings[J].Mechanical Systems&Signal Processing,2016,66/67:665–678.
[3]Chen Z,Jin Z,Xu Y,et al.Identification of magnetic bearing stiffness and damping based on hybrid genetic algorithm[J].Transactions of Nanjing University of Aeronautics and Astronautics,2017,34(2):211-219.
[4]杨作兴,赵雷.电磁轴承动刚度的自动测量[J].机械工程学报,2001,37(3):25-29.
[5]赵晶晶,周燕,时振刚,等.电磁轴承刚度阻尼自动测试[J].机械工程学报,2010,46(20):48-52.
[6]蒋科坚,祝长生,乔晓利,等.采用多自由度转子模型的电磁轴承支承特性测试方法[J].振动工程学报,2014,27(3):457-465.
[7]Tiwari R,Lees A W,Friswell M I.Identification of speed-dependent bearing parameters[J]. Journal of Sound&Vibration,2002,254(5):967-986.
[8]Andrés L S. Experimental identification of bearing dynamic force coefficients in a flexible rotor-further developments[J].Tribology&Lubrication Technology,2007,50(1):114-126.
[9]李启行,王维民,刘宾宾,等.基于电磁激励的柔性转子系统轴承等效参数辨识[J].机械工程学报,2017,53(23):1-6.
[10]刘小静,胡业发,张薇薇,等.磁悬浮系统结构静刚度与结构动刚度测量实验[J].中国机械工程,2010,21(8):908-912.
[11]肖凯,张育林,刘昆.基于PD控制的磁轴承刚度与阻尼分析[J].机床与液压,2007,35(8):26-28.
[12]魏彤,房建成.磁悬浮高速转子系统双频Bode图稳定性分析方法研究[J].航空学报,2007,28(3):641-646.
[13]Anantachaisilp P,Lin Z.An experimental study on PID tuning methods for active magnetic bearing systems[J]. InternationalJournalofAdvanced Mechatronic Systems,2013,5(2):146-154.
[14]Wei C,S9ffker D. Optimization strategy for PIDController design of amb rotor systems[J].IEEE Transactions on Control Systems Technology,2016,24(3):788-803.
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