提出一种新型静水压力驱动的海底沉积物取芯器,它能充分利用海水的静水压力能以冲击打桩的形式采集柱状沉积物。取芯器内部的液压驱动单元将海水的静水压力能转换成取芯器冲击头的动能,冲击头以一定速度反复撞击取样管,使之插入沉积物中,因此液压驱动单元的能量转换效率是影响取芯器性能的关键因素。基于以上分析,利用AMEsim软件构建取芯器内部液压驱动单元模型并将仿真结果与试验结果进行对比验证,模型验证正确后,在现有模型的基础上将模型中提供压力的水泵替换成理想压力源来进一步研究液压驱动单元在海洋环境下的动作情况及能量转换效率,从而得到提高能量转换效率的方法。研究结果表明通过优化液压驱动单元尺寸及根据取样水深调节取芯器冲击头质量,系统能量转换效率能得到显著的提高。

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 adjustab...