A Hydraulic Hammer Corer Utilizing Hydrostatic Energy for Hard Seafloor Sediment Coring

Abstract：The paper presents the design and preliminary test results of a corer used for hard seafloor sediments sampling.Generally the sediment cores are provided by either gravity-type coring or deep-ocean drilling for a range of studies.However, in consideration of the operability and available sample length in collecting hard sediments, these methods exhibit no advantages. In this paper, a new corer which can exploit both hydrostatic energy and gravity energy for hard sediments coring is presented. The hydrostatic energy is provided by pressure differential between ambient seawater pressure and air pressure in an empty cavity. During sampling process, the corer penetrates into the sediment like a gravity corer and then automatically shifts to the percussion mode. The experiments in the laboratory indicate that the corer can complete 40 cycles in the sea with a cycle time of 2.8 seconds in percussion mode and impact the sample tube with the velocity of 0.2 m/s during each cycle. Besides, its adjustable falling velocity can make the corer achieve the maximum efficiency in coring different sediments. 作者： Author： WANG Jian-jun[1]  QIN Hua-wei[2]  CHEN Ying[3]  WEI Shuang-feng[2] 作者單位： The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, ChinaThe Institute of Mechatronic Engineering, Hangzhou Dianzi University,Hangzhou 310018, ChinaThe State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;The Institute of Mechatronic Engineering, Hangzhou Dianzi University,Hangzhou 310018, China 期 刊： 中國海洋工程(英文版)   ISTICEISCI Journal： CHINA OCEAN ENGINEERING 年，卷(期)： 2011, 25(2) 分類號： P716 Keywords： hard sediment coring    hydrostatic energy    percussion coring    機標分類號： U46 O4 機標關鍵詞： maximum efficiency    energy    velocity of    provided    test results    During    air pressure    paper    cycle time    different    range of    presents    impact    design    make    sea    new 基金項目： This work was financially supported by the National Natural Science Foundation of China

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