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RISS 인기검색어
- 검색키워드
- 저자 : Li Baoren (검색결과 5 건)
- 무료
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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.
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Gao Longlong,Xu Wentao,Li Baoren 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
The high-pressure electro-pneumatic servo valve (HESV) is a crucial element for the high-pressure pneumatic servo system. The internal leakage at the null position of the HESV is an important factor to the control accuracy and dynamic characteristics of the high-pressure pneumatic servo system. In this paper, the micro flow behavior of the high-pressure air at the null position of the HESV is evaluated and analyzed by means of computational fluid dynamics (CFD). The effect of annular clearance between the valve spool and sleeve, slightly rounded edges of the valve spool on the micro flow behavior is investigated. Based on the numerical results, the flow characteristics at null position of a direct drive HESV is studied. The numerical results show that the leakage flow rate are strong nonlinear with the valve openings of less than 50 μm, although varies linearly with the increasing supply pressure. The height of the annular clearance and the rounded corner radius cannot be ignored during the high-pressure electro-pneumatic servo system.
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Noise Analysis and Structure Optimization for Sleeve Type Regulating Valve Based on CFD
Cheng Wu,Gang Yang,Fabing Tan,Baoren Li 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
According to the noise problems of sleeve type regulating valve, this paper utilizes the method of Computational Fluid Dynamics(CFD) based on the RNG k-ε turbulence model to analyze flow field characteristics of sleeve type regulating valve, then the window shape and valve core angle is optimized. The analysis shows that the shape of sleeve window has a significant effect on the noise of regulating valve. In the same boundary conditions, the noise of the new valve is 13dB lower than the original valve, and the noise performance of the sleeve type regulating valve gets significant improvement. And its flow characteristic curve is obtained by simulation, which shows that the optimized sleeve flow regulating valve has good linear flow characteristic. The research in this paper can be used for reference for the design of sleeve type regulating valve with low noise and high performance.
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Noise Analysis and Structure Optimization for Globe Valve
Fabing Tan,Gang Yang,Cheng Wu,Baoren Li 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
This paper aims at providing solutions to the problem of oversized pressure fluctuation noise caused by globe valves in pipeline systems. CFD method is employed to calculate the pressure fluctuation noise in the inlet and outlet of the globe valve (GV) in working condition. The numerical calculation results are verified by being compared with the experimental results obtained through testing trials on the pressure fluctuation noise of GV by establishing testing bed. On the basis of the above-mentioned numerical calculation results and experimental results, optimal design for the internal flow channel of the valves is carried out in order to reduce the pressure fluctuation noise caused by the GV. In the same load condition, the pressure fluctuation noise in the inlet and outlet of the optimized GV is attenuated by more than 20dB, compared with that of the original valves. This indicates that the optimal design provided by this paper significantly improves the noise performance of the GV. The research findings might offer certain guidance to the optimal design of flow channel of other kinds of valves in pipeline systems.
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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.
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