scholarly journals Controlling chaotic dynamical behavior of a semiconductor laser with external optical feedback using sliding mode variable structure control scheme

2005 ◽  
Vol 54 (2) ◽  
pp. 543
Author(s):  
Huang Liang-Yu ◽  
Luo Xiao-Shu ◽  
Fang Jin-Qing ◽  
Zhao Yi-Bo ◽  
Tang Guo-Ning
Keyword(s):  
Semiconductor Laser ◽  
Optical Feedback ◽  
Sliding Mode ◽  
Dynamical Behavior ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Structure Control ◽  
Control Scheme ◽  
Sliding Mode Variable Structure

scholarly journals Experimental study on sliding mode variable structure control of active vibration isolation system of floating raft under multiple excitations

2018 ◽  
Vol 37 (4) ◽  
pp. 1176-1187
Author(s):  
Xianglong Wen ◽  
Kang Yi ◽  
Chunsheng Song ◽  
Jinguang Zhang
Keyword(s):  
Vibration Isolation ◽  
Control Method ◽  
Sliding Mode ◽  
Reference Signal ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Vibration Signal ◽  
Isolation System ◽  
Structure Control ◽  
Sliding Mode Variable Structure

The frequency components of vibration signal in vibration isolation system under multiple excitations are quite complex.Self-adaptive feedforward control method based on Least Mean Square algorithm has strict requirements for reference signal, which results in a certain restriction on its practical application. Sliding mode variable structure control method needs neither complicated reference signal nor accurate mathematical model. It has the strong robustness for external disturbance and system parameter perturbation, and the physical implementation is simple. To this end, application of sliding mode variable structure control method is studied. First, mathematical model of the control channel through system is established for identification. Second, the discrete sliding mode variable structure controller based on state-space model is designed to carry out simulation and experiment. The experimental result indicates that root mean square value of vibration signal after control is decreased by 57.90%, of which the amplitudes of two main frequency components 17 and 25 Hz reduce by 42.66 and 72.71%, respectively. This shows that sliding mode variable structure control is an effective control method for active vibration isolation of floating raft under multiple excitations.

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