用于天然气水合物调查的轻便型声学深拖系统总体方案分析

论证了用于天然气水合物调查的轻便型声学深拖系统的总体方案,其拖曳方式选择是其核心问题之一,重力型拖体操作方便但稳定性差,弱正浮力型拖体稳定性好而操作复杂。首先论证了两型声学深拖的运动性能,分析了提升重力型拖体稳定性的措施,结果表明,重力型拖体俯仰运动稳定性显著弱于弱正浮力型拖体,并且各项改善措施对于稳定性提高不显著。其次对测深侧扫声呐、多波束测深声呐、浅地层剖面仪和声多普勒测速仪等声学深拖系统主要搭载声呐开展分析,准定量的得到对拖曳平台稳定性的要求。综合考虑拖体稳定性、配套装备要求、开发经验和成本等因素,为了获得更好的探测结果,最终确定采用弱正浮力型拖曳系统,并给出了系统的总体设计方案。

GENERAL SCHEME ANALYSIS OF THE LIGHTWEIGHT ACOUSTIC DEEP-TOW SYSTEM FOR GAS HYDRATE EXPLORATION

This paper presents the general scheme of a lightweight acoustic deep-tow system for gas hydrate exploration. The selection of the towing mode is one of the key problems. The gravity type of towing system is easily being operated with poor stability, and the weak positive buoyancy type of towing system is of good stability, but complex in operation. This paper demonstrates the performance of the two types of acoustic deep-tow system, and analyzes the ways to enhance the stability of the gravity type of deep-tow system. The results show that the pitch stability of the gravity type of towing system is much behind the weak positive buoyancy type of towing system, and the measures being taken to improve the stability is not effective. Secondly, in this paper we discussed the other methods, such as bathymetric sidescan sonar, sidescan sonar, multi-beam bathymetric sonar, subbottom profiler, acoustic doppler velocity log and other sonars, which are usually equipped in deep-tow systems, and have obtained the quasi-quantitative requirements for the stability of the towing platform. By consideration of platform stability, requirements for supporting equipment, development experience and cost factors, we recommended the weak positive buoyancy type of towing system for better detection results, and the overall design of the system is presented.