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A test.model of Water Pressures within a Fault in Rock Slope

Journal of China University of Geosciences 2001年第4期12卷 309-311页

作者： Yang Tong Wang Baoxue Hu Heng Civil and Environmental Engineering School, Beijing Institute of Technology , Beijing 100083 Civil and Environmental Engineering School Beijing Institute of Technology Beijing 100083

This paper introduces model test.results of water pressure in a fault, which is located in a slope and 16 different conditions. The results show that the water pressures in fault can be expressed by a linear function, which is similar to the theoretical model suggested by Hoek. Factors affecting water pressures are water level in tension crack, dip angle of fault, the height of filling materials and thickness of fault zone in sequence.

关键词： rock slope water pressure model test.

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Comparative numerical and experimental study of two combined wind and wave energy concepts

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Journal of Ocean Engineering and Science 2016年第1期1卷 36-51页

作者： Zhen Gao Torgeir Moan Ling Wan Constantine Michailides Centre for Ships and Ocean Structures Norwegian University of Science and TechnologyTrondheimNorway Centre for Autonomous Marine Operations and Systems Norwegian University of Science and TechnologyTrondheimNorway Department of Marine Technology Norwegian University of Science and TechnologyTrondheimNorway

With a successful and rapid development of offshore wind industry and increased research activities on wave energy conversion in recent years,there is an interest in investigating the technological and economic feasibility of combining offshore wind turbines(WTs)with wave energy converters(WECs).In the EU FP7 MARINA Platform project,three floating combined concepts,namely the spar torus combination(STC),the semi-submersible flap combination(SFC)and the oscillating water column(OWC)array with a wind turbine,were selected and studied in detail by numerical and experimental *** paper summarizes the numerical modeling and analysis of the two concepts:STC and SFC,the model test. at a 1:50 scale under simultaneous wave and wind excitation,as well as the comparison between the numerical and experimental *** operational and survival wind and wave conditions were *** numerical analysis was based on a time-domain global model using potential flow theory for hydrodynamics and blade element momentum theory(for SFC)or simplified thrust force model(for STC)for *** techniques for model test.ng of combined wind and wave concepts were discussed with focus on modeling of wind turbines by disk or redesigned small-scale rotor and modeling of power take-off(PTO)system for wave energy conversion by pneumatic damper or hydraulic rotary *** order to reduce the uncertainty due to scaling,the numerical analysis was performed at model scale and both the numerical and experimental results were then up-scaled to full scale for *** comparison shows that the current numerical model can well predict the responses(motions,PTO forces,power production)of the combined concepts for most of the ***,the linear hydrodynamic model is not adequate for the STC concept in extreme wave conditions with the torus fixed to the spar at the mean water level for which the wave slamming on the torus occurs and this requires further investigati

关键词： Combined wind and wave energy concept Floating wind turbine Wave energy converter Numerical analysis model test.

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Nonlinear roll damping of a barge with and without liquid cargo in spherical tanks

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Journal of Ocean Engineering and Science 2016年第1期1卷 84-91页

作者： Wenhua Zhao Mike Efthymiou Finlay McPhail Sjoerd Wille Faculty of Engineering Computing and MathematicsThe University of Western Australia35 Stirling HighwayCrawleyWA 6009Australia Shell Global Solutions BV(Shell) Kessler Park 12280 ABRijswijkThe Netherlands

Damping plays a significant role on the maximum amplitude of a vessel’s roll motion,in particular near the resonant *** is a common practice to predict roll damping using a linear radiation-diffraction code and add that to a linearized viscous damping component,which can be obtained through empirical,semi-empirical equations or free decay test. in calm ***,it is evident that the viscous roll damping is nonlinear with roll velocity and *** liquid cargo motions inside cargo tanks also contribute to roll damping,which when ignored impedes the accurate prediction of maximum roll *** this study,a series of free decay model test. is conducted on a barge-like vessel with two spherical tanks,which allows a better understanding of the nonlinear roll damping components considering the effects of the liquid cargo *** examine the effects of the cargo motion on the damping levels,a nonlinear model is adopted to calculate the damping *** liquid cargo motion is observed to affect both the linear and the quadratic components of the roll *** flow memory effect on the roll damping is also *** nonlinear damping coefficients of the vessel with liquid cargo motions in spherical tanks are obtained,which are expected to contribute in configurations involving spherical tanks.

关键词： LNG carrier Nonlinear roll damping Liquid cargo motion Spherical tanks model test.

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Exploratory study on new pulse detonation engines

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Progress in Natural Science:Materials International 2003年第2期 10-16页

作者： YAN Chuanjun, FAN Wei, HUANG Xiqiao, ZHANG Qun and ZHENG Longxi(Department of Aeroengines, Northwestern Polytechnical University, Xi’an 710072, China)

Abstract The worldwide progress in studies on pulse detonation engines (PDE) is briefly reviewed and some results of out ex-ploratory study on PDE are presented. Analysis of thermodynamic cycle is made and the specific impulse formula is improved. A proof-of-principle experiment of a two-phase PDE is successfully carried out, using poor-detonable liquid C8H16/air mixture with a low-energy sys-tem (total spark energy of 50 mJ) and a newly developed one-step detonation initiation method. The measured detonation wave pressureratio is very close to that of C-J detonation. The effects of length, diameter and detonation frequency on PDE performance are experimen-tally investigated. For liquid hydrocarbon fuel/air mixture, the PDE operation is successfully realized with an engine length of 1000 mmand detonation frequency up to 36 Hz, which has made an important step toward practical PDE. The developed code can be used for simu-lating PDE operation processes including deflagration to detonation transition (

关键词： pulse detonation engine performance parameter model test.

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