中文摘要：

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。

英文摘要：

A new hydrostatic seafloor sediment corer which can explore the in situ hydrostatic energy to collect the sediment in percussion way,analogue to the pile-driving,is proposed.Its built-in hydraulic drive unit converts seawater＇s hydrostatic energy to the kinetic energy of the corer＇s hammer which falls to impact the sampling tube into the sediment repeatedly,so the energy conversion efficiency is a key factor to the corer performance.Based on the analysis above,a computer model of the drive unit is constructed by using AMEsim software and the model is validated by comparing the simulation data with experimental data.In the valid model the water pump is substituted by a perfect pressure source to simulate the seawater and reveal the significant factors that influence the efficiency of the corer in the seawater.The results indicate that the energy conversion efficiency of the system can be improved significantly by optimizing the physical dimensions of drive unit and adjusting the weight of the hammer according to the coring depth.