浮筏隔振系统自适应前馈控制研究

发布时间：2019-04-19 19:50

【摘要】：潜艇的水下噪声源主要由机械噪声、水动力噪声和螺旋桨噪声组成。在低速巡航工况下，由动力机组设备的运行所产生的机械振动引起的机械噪声成为潜艇水下噪声的主要来源。浮筏隔振是目前广为采用的一种有效的降低高频机械噪声的隔振装置，，但对于低频机械振动效果有限。而振动主动控制技术对低频振动有很好的控制效果，为此，本文以带主动动力吸振器的浮筏隔振系统为研究对象，设计了基于x-LMS滤波算法的多通道自适应前馈控制律，并对其做了仿真分析，研究其振动控制效果。首先研究了单/双层隔振系统的基本原理。为了抑制低频段的振动引入了主动力单元，研究了隔振质量块的位移信号反馈、速度信号反馈和加速度信号反馈对主动隔振系统隔振性能的影响，在此基础上研究了基于PID控制律的带主动动力吸振器的双层隔振系统，并对其振动控制效果做了仿真分析。其次在四端参数法的基础上，采用子结构导纳法建立了带主动动力吸振器的浮筏隔振系统模型，求出了其扰动通道和控制通道的传递函数，并分析了其幅频特性。然后研究了LMS自适应前馈控制律基本原理，并在此基础上，考虑控制通道对滤波器输出的滤波作用，研究了基于滤波x-LMS算法的单通道自适应前馈控制律。最后针对已建立的带主动动力吸振器的浮筏隔振系统模型，以单通道滤波x-LMS算法自适应前馈控制律为基础，以传递到基础四个目标观测点振动响应的均方误差之和为控制系统的性能评价函数，设计了多通道的滤波x-LMS算法自适应前馈控制律，并利用MATLAB SIMULINK对多通道浮筏模型进行了自适应前馈控制仿真分析。仿真结果表明，在浮筏隔振系统中安装主动动力吸振器进行振动主动控制在低频段取得了良好的振动控制效果，具有一定的工程应用价值。
[Abstract]:The underwater noise source of submarine is mainly composed of mechanical noise, hydrodynamic noise and propeller noise. Under the condition of low speed cruise, the mechanical noise caused by mechanical vibration caused by the operation of power unit equipment becomes the main source of submarine underwater noise. Floating raft vibration isolation is an effective vibration isolation device widely used at present to reduce high frequency mechanical noise, but its effect on low frequency mechanical vibration is limited. The active vibration control technology has a good control effect on low frequency vibration. In this paper, a multi-channel adaptive feedforward control law based on x-LMS filtering algorithm is designed for the floating raft vibration isolation system with active dynamic vibration absorber. The effect of vibration control is studied by simulation and analysis. Firstly, the basic principle of single / double layer vibration isolation system is studied. In order to restrain the low frequency vibration, the main force element is introduced. The effects of displacement signal feedback, velocity signal feedback and acceleration signal feedback on the vibration isolation performance of the active vibration isolation system are studied. On this basis, a double-layer vibration isolation system with active dynamic vibration absorber based on PID control law is studied, and its vibration control effect is simulated and analyzed. Secondly, based on the four-terminal parameter method, the model of floating raft vibration isolation system with active dynamic vibration absorber is established by using substructure admittance method. The transfer functions of disturbance channel and control channel are obtained, and the amplitude-frequency characteristics of the system are analyzed. Then, the basic principle of LMS adaptive feedforward control law is studied. On the basis of this, the single-channel adaptive feedforward control law based on filter x-LMS algorithm is studied considering the filtering effect of control channel on filter output. Finally, according to the established model of floating raft vibration isolation system with active dynamic vibration absorber, the adaptive feedforward control law of single channel filter x-LMS algorithm is used as the basis. The adaptive feedforward control law of multi-channel filter x-LMS algorithm is designed based on the sum of mean square error of vibration response transmitted to four target observation points as the performance evaluation function of the control system. The adaptive feedforward control simulation of multi-channel floating raft model is carried out by using MATLAB SIMULINK. The simulation results show that the active dynamic vibration absorber installed in the floating raft vibration isolation system has achieved good vibration control effect in low frequency band and has certain engineering application value.
【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.76;U661.44

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