浮筏隔振系統(tǒng)自適應(yīng)前饋控制研究
發(fā)布時間：2019-04-19 19:50
【摘要】：潛艇的水下噪聲源主要由機(jī)械噪聲、水動力噪聲和螺旋槳噪聲組成。在低速巡航工況下，由動力機(jī)組設(shè)備的運(yùn)行所產(chǎn)生的機(jī)械振動引起的機(jī)械噪聲成為潛艇水下噪聲的主要來源。浮筏隔振是目前廣為采用的一種有效的降低高頻機(jī)械噪聲的隔振裝置，，但對于低頻機(jī)械振動效果有限。而振動主動控制技術(shù)對低頻振動有很好的控制效果，為此，本文以帶主動動力吸振器的浮筏隔振系統(tǒng)為研究對象，設(shè)計(jì)了基于x-LMS濾波算法的多通道自適應(yīng)前饋控制律，并對其做了仿真分析，研究其振動控制效果。 首先研究了單/雙層隔振系統(tǒng)的基本原理。為了抑制低頻段的振動引入了主動力單元，研究了隔振質(zhì)量塊的位移信號反饋、速度信號反饋和加速度信號反饋對主動隔振系統(tǒng)隔振性能的影響，在此基礎(chǔ)上研究了基于PID控制律的帶主動動力吸振器的雙層隔振系統(tǒng)，并對其振動控制效果做了仿真分析。 其次在四端參數(shù)法的基礎(chǔ)上，采用子結(jié)構(gòu)導(dǎo)納法建立了帶主動動力吸振器的浮筏隔振系統(tǒng)模型，求出了其擾動通道和控制通道的傳遞函數(shù)，并分析了其幅頻特性。 然后研究了LMS自適應(yīng)前饋控制律基本原理，并在此基礎(chǔ)上，考慮控制通道對濾波器輸出的濾波作用，研究了基于濾波x-LMS算法的單通道自適應(yīng)前饋控制律。 最后針對已建立的帶主動動力吸振器的浮筏隔振系統(tǒng)模型，以單通道濾波x-LMS算法自適應(yīng)前饋控制律為基礎(chǔ)，以傳遞到基礎(chǔ)四個目標(biāo)觀測點(diǎn)振動響應(yīng)的均方誤差之和為控制系統(tǒng)的性能評價函數(shù)，設(shè)計(jì)了多通道的濾波x-LMS算法自適應(yīng)前饋控制律，并利用MATLAB SIMULINK對多通道浮筏模型進(jìn)行了自適應(yīng)前饋控制仿真分析。仿真結(jié)果表明，在浮筏隔振系統(tǒng)中安裝主動動力吸振器進(jìn)行振動主動控制在低頻段取得了良好的振動控制效果，具有一定的工程應(yīng)用價值。
[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.
【學(xué)位授予單位】：中國艦船研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U674.76;U661.44
本文編號：2461229
[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.
【學(xué)位授予單位】：中國艦船研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U674.76;U661.44
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