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An Analysis of the Static and Dynamic Behavior of the hydraulic co.pensation System of a Multichannel Valve

Fluid Dynamics & Materials Processing 2023年第7期19卷 1817-1836页

作者： Jikang Xu Ruichuan Li Yi Cheng Yanchao Li Junru Yang Chenyu Feng Xinkai Ding Huazhong Zhang co.lege of Transportation Shandong University of Science and TechnologyQingdao266590China School of Mechanical and Automotive Engineering Qilu University of TechnologyJinan250353China co.lege of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China rizhao haizhuo hydraulic co. Ltd.Rizhao276800China rizhao Polytechnic Rizhao276800China

Electro-hydraulic proportional valve is the co.e co.trol valve in many hydraulic systems used in agricultural and engineering *** address the problem related to the large throttling losses and poor stability typically associated with these valves,here,the beneficial effects of a triangular groove structure on the related hydraulic response are studied.A mathematical model of the pressure co.pensation system based on the power-bond graph method is introduced,and the AMESim software is used to simulate its *** results show that the triangular groove structure increases the jet angle and effectively co.pensates for the hydrodynamic *** steady-state differential pressure at the valve port of the new pressure co.pensation structure was 0.65 ***,experimental results show that the pressure difference at the main valve port is 0.73 MPa,and that the response time is less than 0.2 *** is co.cluded that the new co.pensation structure has good pressure co.pensation response characteristics.

关键词： Electrohydraulic proportional valve spool shape pressure co.pensation valve port differential pressure response time

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Field observation of wave overtopping at sea dike using shore-based video images

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Journal of Hydrodynamics 2021年第4期33卷 657-672页

作者： Shan-hang Chi Chi Zhang Ti-ti Sui Zhu-bin Cao Jin-hai Zheng Jiang-shan Fan State Key Laboratory of Hydrology-Water Resources and hydraulic Engineering Hohai UniversityNanjing210098China Key Laboratory of Ministry of Education for co.stal Disaster and Protection Hohai UniversityNanjing210098China co.lege of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing210098China rizhao Port Group co. Ltd.Rizhao276826China

Wave overtopping at a sea dike was observed using video images during a storm in July 2018 at rizhao co.st,China.A shore-based video monitoring system was mounted to co.lect co.stal images with a sample frequency of 1 Hz in the beginning 10 min of each hour during daylight.A method to extract the frequency,location,width and duration of individual overtopping events based on the shore-based video monitoring system was developed.A total of 6252 individual overtopping events were detected over a 360m long sea dike during the storm of 10 h in a safe and labor-saving way,enabling a detailed analysis of the temporal and spatial variation of wave *** temporal variation of overtopping duration,frequency and volume is basically in sync with the change of tidal level(R=0.87,0.82 and 0.76,respectively).The increase of wave height increases the overtopping frequency *** found a high co.relation between the hourly observed data and the predicted results of two co.monly used *** the previous field measurements of overtopping that were limited in a single location,significant spatial variation of overtopping in the alongshore direction is *** overtopping volume varies with a factor of 6 within the range of several wave *** is further revealed that the spatial variation of overtopping is highly co.related with the alongshore variation of surf zone width with a co.relation co.fficient of *** present study suggests the feasibility of shore-based video monitoring technique to capture the main features of wave overtopping at co.stal dikes,providing new possibilities to monitor wave overtopping in the field and to improve prediction tools.

关键词： Wave overtopping co.stal video monitoring field measurement temporal and spatial variations storm events

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