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Research on Low Shock Optimization Control of Ship Steering Hydraulic System
Lihui Liao,Baoren Li,Jingmin DU,Zhendong Wei 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
In this study, the valve control ship steering hydraulic system (SSHS) is designed and set up for research on the low hydraulic shock control. As the hydraulic shock phenomenon is serious with traditional PID control, a fuzzy control method is proposed to replace the traditional proportional-integral-differential (PID) control method for low shock optimization control of the valve control ship steering hydraulic system (VCSSHS) through reasonable design of fuzzy control rules. Simulation models of the VCSSHS are set up to have a comparative research of the traditional PID control method and the proposed fuzzy control method, which indicates that the proposed fuzzy control method could greatly reduce the amplitude of hydraulic shock in the process of ship rudder position adjustment.
Qianhong Zhang,Lihui Yang,Daixi Liao 한국전산응용수학회 2012 Journal of applied mathematics & informatics Vol.30 No.5
In this paper, a class of impulsive fuzzy bi-directional associative memory (BAM) neural networks with distributed delays and variable coefficients are considered. Using Lyapunov functional method and fixed point theorem, we derived some sufficient conditions for the existence and globally exponential stability of unique periodic solution of the networks. The results obtained are new and extend the previous known results. In addition,an example is given to show the effectiveness of our results obtained.
Zhang, Qianhong,Yang, Lihui,Liao, Daixi The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.5
In this paper, a class of impulsive fuzzy bi-directional associative memory (BAM) neural networks with distributed delays and variable coefficients are considered. Using Lyapunov functional method and fixed point theorem, we derived some sufficient conditions for the existence and globally exponential stability of unique periodic solution of the networks. The results obtained are new and extend the previous known results. In addition, an example is given to show the effectiveness of our results obtained.
WEI Zhendong,DU Jingmin,LIAO Lihui,Yang Gang,LI Baoren 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
According to theory of phononic crystals (PCs), a ship hydraulic pipeline isolator with one-dimensional periodic composite structure is designed, which is composed of metal and rubber. The vibration of ship hydraulic pipeline can be suppressed by the band gaps (BGs) of the isolator. The band structure and frequency response function (FRF) of the isolator is figured out by the finite element method (FEM). To obtain the best frequency ranges and width of the BGs, the influences of various material, lattice constant and fineness ratio are considered, and the best structure parameters were also obtained. The results revealed that the isolator has axial vibration BGs with frequencies from 400 Hz to 10000 Hz, and the maximum vibration attenuation is up to 150 dB. The research provides a new technical method to control vibration of ship hydraulic pipeline.