Gu Linyi, male, born in March 1973. Professor, Ph.D. Senior member of Chinese Mechanical Engineering Society, committeeman in Youth Affairs Committee of Fluid Power Transmission and Control Sub-society. Graduated from Zhejiang University in December 1998, majored in fluid power transmission and control. Advisor is Professor Lu Yongxiang. Take a teaching and research position in the Mechanical Engineering Department at Zhejiang University, and the State Key Laboratory of Fluid Power Transmission and Control after graduation, with particular interests in energy-saving on/off hydraulic components and systems, deep-sea hydraulic component and devices, deep-sea pressure tight samplers, deepwater offshore oil exploitation devices, and underwater vehicles. Be appointed the deputy director (part-time) of the Institute of Marine Resource Exploration and Underwater Technology in Ocean Research Center at Zhejiang University.
Education and Experience
1. 2008.12 up to now: Professor , Advisor for Ph.D candidates in the Mechanical Engineering Department at Zhejiang University, and the State Key Laboratory of Fluid Power Transmission and Control. Deputy director (part-time) of the Institute of Marine Resource Exploration and Underwater Technology in Ocean Research Center at Zhejiang University.
2. 2006.12-2008.12: Visiting scholar in the Mechanical Engineering Department at University of Minnesota, the chief University of NSF Engineering Research Center for Compact and Efficient Fluid Power, U.S.A.
3. 1998.12-2006.12: Professor (2005.12-), Advisor for Ph.D candidates (2006.12-) in the Mechanical Engineering Department at Zhejiang University, and the State Key Laboratory of Fluid Power Transmission and Control. Deputy director (2007.10-, part-time) of the Institute of Marine Resource Exploration and Underwater Technology in Ocean Research Center at Zhejiang University.
4. 1993.9-1998.12: Master and Ph.D program in Zhejiang University, majored in fluid power transmission and control.
5. 1989.9-1993.6: Bachelor program in Zhejiang University, majored in fluid power transmission and control.
A. High-speed on/off hydraulic components and systems based on new principle
1. Switch-mode hydraulic power supply theory: Switch-mode hydraulic power supply is a hydraulic pressure converting unit made up of distributed high-speed hydraulic components. It can convert “redundant” input hydraulic pressure into increased output flow rate, or obtain higher output pressure than supply pressure at the expense of “redundant” input flow rate. The output pressure can be steplessly adjusted through high-speed hydraulic components with low power loss. Switch-mode hydraulic power supply provides a new energy-saving method for multiple-actuator hydraulic systems. The supply pressure of hydraulic system would be no longer restricted by its load if the pressure boost switch-mode hydraulic power supply were applied.
2. Switch-mode virtual displacement variable hydraulic motor/pump and transformer: Switch-mode virtual displacement variable motor is a special motor for hydraulic hybrid system. It introduced the above “pressure buck switch-mode hydraulic power supply” into a fixed-displacement piston hydraulic motor, 7 pilot valves and 14 pilot controlled high speed check valves are applied to control the oil distribution of its 7 pistons. 1 pilot valve and 2 check valves for each piston respectively, instead of the function of port-plate in the piston motor. It would enable the minimum throttle losses under part-load conditions in multiple actuator systems, wide variable displacement control range with high efficiency, and a good dynamic performance. Accurate machining of the 7 pilot valves, which are driven by the rotating piston cylinder, allows the switch-mode control period primely matches the rotary position of each piston. Thus, it is able to reduce the unbalance force (or torque) on the variable displacement driving direction, so that the response of variable displacement control could be advanced 10 times accordingly, through separating the variable displacement driving part from swash plate. It also has great performance and high efficiency as a pump, and has a smooth transition between motor function and pump function, without passing its middle position.
B. Deep-sea mechanical-hydraulic systems based on new principle
3. Deep-sea (6000m depth) sediment pressure-tight sampling theory: Traditional sediment samplers, such as multiple corer and piston corer (which can collect sediment on the seafloor with the help of gravity), has their own disadvantage that in-situ pressure of the sample cannot be maintained for a long time after the sample is taken from deep sea. The sediment collected from the deep sea will change its character as the pressure decreases, such as the dissipation of the gas phase dissolved in the sediment, the change of ionic oxidation state, the decomposition of the organic element and the vast scale death of the barophilic microbes. These changes make it difficult to know the primitive component and the original state of the sediment. Pressure-tight sampling technique has drawn more and more attention of the oceanographer all over the world recently. But for deep-sea sediments, pressure-tight sampling is still a new technique. A self-tight sealing technique and semi-active pressure compensating structure make it possible to maintain more than 95% in-situ pressure in pressure-tight multiple corer (60cm in diameter) and pressure-tight piston corer (10m in length).
4. Direct drive and control theory utilizing seawater pressure under deep sea (6000m depth): To drive hydraulic actuator utilizing seawater pressure directly provides a new hydraulic power supply method for deep-sea equipments. Instead of underwater battery and hydraulic power unit, a compressible elastic container filled with hydraulic oil is launched into the deep sea together with the equipments. Large pressure difference (10-60MPa) occurs between the elastic container and the cavity of equipment’s frame. Under this pressure difference, the hydraulic actuator can be driven directly. It can obtain equivalent power only in half weight and the same volume.
5. Deep-sea (6000m depth) pressure-adaptive hydraulic and electronic component and system: While hydraulic system works under the deep sea, the system should adapt to the seawater pressure so as to drive the hydraulic actuators which are exposed to the seawater. To solve this problem, a hydraulic compensator is used to compensate the tank pressure of hydraulic power supply. It makes the tank pressure always be a little higher than outer seawater pressure so as to prevent seawater from entering into the tank. Meanwhile, since the hydraulic components are all placed inside the tank, the whole structure is greatly simplified. In addition, such structure also benefits the installation of sensors and control circuits. As all the electronic parts (controller and sensors) are immerged in the high pressure oil instead of in the seawater, the assembly of electronic system is also greatly simplified.
Recent Achievements since 1999
u35 articles were published in journals and international conference proceedings as the first or the second author, in which 17 articles were indexed by EI and 2 articles were indexed by SCI.
u16 invention patents and 16 new practical patents were authorized as chief inventor or the first participator.
u3 achievements won the Provincial or Ministry Science & Technique Progress Prize as chief scientist or the first participator. 1 first-class, 1 second-class prize and 1 third-class prize.
u27 projects were supported by National Natural Science Foundation of China, State 863 High Technology R&D Project of China, or other provincial foundations or projects, as chief scientist or the first participator.
A. In journals and transactions
1. Gu Linyi, Wang Feng, Chen Ying, Zhang Yan. Research on deep-sea power supply technique from seawater pressure based on switchmode hydraulic power supply. Chinese Journal of Mechanical Engineering, 2004, 40(5): 141-144, CN11-2187/TH+2004+5+141. (EI Core)
2. Gu Linyi, Cao Jianwei, Qiu Minxiu. Secondary regulation hydraulic system based on fixed flow-rate net. Chinese Journal of Mechanical Engineering, 2003, 39(3): 76-80, CN11-2187/TH+2003+3+76. (EI Core)
3. Gu Linyi, Qiu Minxiu, Jin Bo, Cao Jianwei. New hydraulic systems made up of hydraulic power bus and switch-mode hydraulic power supplies. Chinese Journal of Mechanical Engineering, 2003, 39(1): 84-88, CN11-2187/TH+2003+1+84. (EI Core)
4. Gu Linyi, Wang Qingfeng, Lu Yongxiang. Research on acceleration and deceleration characteristic for high inertia loads driven by hydraulic. Chinese Journal of Mechanical Engineering, 2002, 38(10): 46-49, CN11-2187/TH+2002+10+46. (EI Core)
5. Gu Linyi, Wang Qingfeng. Research on calculated flow feedback control method and its characteristic. Chinese Journal of Mechanical Engineering, 1999,35(4): 96-98, CN11-2187/TH+1999+4+96. (EI Core)
6. Gu Linyi, Hu Zhigang, Liu Yingbing. Approach of plus width / plus frequency modulate in SIMULINK. Chinese Hydraulics and Pneumatics, 2003(9): 1~3 CN11-2059/TH+2003+9+1.
7. Gu Linyi, Xie Yingjun. Summarization on the development of flow division of multi- actuators load sensing system. Machine Tool & Hydraulics, 2001(3): 3-6, CN44-1259/TH+2001+3+3.
8. Gu Linyi, Xie Yingjun, Wang Qingfeng. General discussion about stability in the starting/ braking of construction machinery with high inertia load. Construction Machinery and Equipment, 2001, 32(2): 28-31, CN12-1190/TH+2001+2+28.
9. Gu Linyi, Wang Qingfeng, Luo An. Digital controller for electro-hydraulic proportional actuator unit. Mechanical & Electrical Engineering Magazine, 1997(6): 77-79, CN33-1088/TM+1997+6+77.
10. Gu Linyi, Wang Qingfeng, Yuan Weijun. Self-learning fuzzy control for electro-hydraulic proportional position control system. Machine Tool & Hydraulics, 1995(6): 315-318, CN44-1259/TH+1995+6+315.
11. Qin Huawei, Gu Linyi, Li Shilun, Zhu Liang, Chen Ying. Pressure tight piston corer-A new approach on gas hydrate investigation. China Ocean Engineering, 2005, 19(1): 121-128, CN32-1441/P+2005+1+121, (SCI, Impact factor: 0.225).
12. Zhang Jun, Gu Linyi, Qian Xiaolin, Ni Shouzhong, Hou Zhaoxin. Research on ultrasonic measurement of high strength bolt axial tension in steel construction. Chinese Journal of Mechanical Engineering. 2006, 42(2): 216~220, CN11-2187/TH+2006+2+216. (EI Core)
13. Qin Huawei, Gu Linyi, Chen Ying. Velocity control system for high inertia loads based on switchmode hydraulic power supply. Chinese Journal of Mechanical Engineering, 2004, 40(9): 106-110, CN11-2187/ TH+2004+9+106. (EI Core)
14. Wang Qingfeng, Gu Linyi, Lu Yongxiang. Research on principle and performance of meter-in, meter-out independent regulated based on pressure decrease sensing. Chinese Journal of Mechanical Engineering, 2001, 37(4): 21-24, CN11-2187/TH+2001+2+21. (EI Core)
15. Zhu Liang, Gu Linyi, Qin Huawei. Deep-sea pressure tight sediment sampling technique and its application. Journal of Zhejiang University(Engineering science), 2005, 39(7): 1060~1063, CN33-1245/T +2005+7+1060. (EI Core)
16. Wang Feng, Gu Linyi, Chen Ying. An energy conversion system based on deep-sea pressure. Ocean Engineering, 35(1): 53-62. (SCI, Impact factor: 0.663) (EI Core)
17. Zhang Jun, Gu Linyi, Qiu Huiqiang, Zhou Chen. Research on uninterrupted hydraulic power supplies for deep-sea underwater hydraulic systems based on ripple pipe. Chinese Hydraulics and Pneumatics, 2004(6)
18. Cao Jianwei, Gu Linyi, Zhou Hong. Research on the high accuracy pressure control of low damping hydraulic servo system based on meter-in and meter-out coordinated regulating principle. Machine Tool & Hydraulics, 2003(4): 126~128 CN44-1259/TH+2003+4+126.
19. Cao Jianwei, Gu Linyi, Zhou Hong. Research on servo control system of hydraulic amplified force reference machine. Chinese Hydraulics and Pneumatics, 2002(8): 38-39 CN11-2059/TH+2002+8+38.
20. Wang Qingfeng, Gu Linyi, Yuan Weijun. Hydraulic Draggling-Winding System with Load Auto-adaption. Machine Tool & Hydraulics, 2000(5): 40-42, CN44-1259/TH+2000+5+40.
21. Wang Qingfeng, Gu Linyi, Lu Yongxiang. Research on electro-hydraulic proportional digital controlled integrated cylinder. Machine Tool & Hydraulics, 1996(5): 6-9, CN44-1259/TH+1996+5+6.
22. Wang Qingfeng, Gu Linyi, Yuan Youkun, Lu Yongxiang. Self-learning compensation for variable dead-area of electro-hydraulic proportional high accurate positioning. Machine Tool & Hydraulics, 1994(5): 249-251. CN44-1259/TH+1994+5+249.
B. In international conference proceedings
1. Gu Linyi, Wang Qingfeng. Research on noninterference control of multiple actuators load sensing system with high inertia in construction machinery. Proceedings of 01’ICFP, Hangzhou, P.R.China, 2001.5, 373-377, ISBN7 -5062-4955-3/TH.137-53+2001+373, indexed by ISTP.
2. Gu Linyi, Wang Qingfeng. Research on control of multiple actuator system with high inertia in construction machinery. Proceedings of ISFP’03, Wuhan, P.R.China, 2003.5, 125-129, ISBN 7-5062-5862 -5/TH.137-53+2003+125.
3. Wang Qingfeng, Gu Linyi, Lu Yongxiang. Research on Digital Control of Meter-in and Meter-out Independent Regulating for High Inertia Load. Fluid Power Systems and Technology-1999 (FPST-Vol.6), ASME 1999, Tennessee, USA, 1999.11, 109-114. (EI Core)
4. Cao Jianwei, Gu Linyi, Wang Feng,Qiu Minxiu．Switchmode hydraulic power supply theory．Proceedings of IMECE2005, Fluid Power Systems and Technology Division(FPST), IMECE2005-79019,2005 ASME International Mechanical Engineering Congress and Exposition, Orlando, Florida, USA, 2005.11. (EI Core)
5. Cao Jianwei, Gu Linyi, Wang Feng, Chen Ying．Research on the principle and characteristic of Compounded switch-mode hydraulic power supply．