Abstract
Manned underwater robot is an important platform to carry various sensors and working tools to finish the in situ measurement and sampling in the deep sea. Due to its limited loading capacity, the device it will be carried, usually, requires to be able to dive to its working depth with a small volume and weight. According to the application requirements of deep-sea sediment temperature gradient in situ measurement observed, a detector system that can obtain data in situ is designed, which mainly includes a titanium alloy electronic cabin and a temperature probe. A comprehensive design analysis method is used to compare and analyze the ultimate static pressure, stability limit load, bending moment load, and transient temperature field on the underwater operation conditions. Optimal dimensions and filled media in the probe are decided. Finally, the pressure resistance test is finished in the lab, and scientific application is conducted on Jiaolong’s 127th dive in the Northwest Indian Ocean, which successfully sampling the temperature gradient data of deep-sea sediments in the Daxi hydrothermal area. The method introduced in this article can effectively improve the safety and reliability of deep-sea structure and greatly reduce costs throughout the design cycle.
Highlights
The temperature gradient of seabed sediments is an important parameter to describe the thermal state of seabed sediments, which is of great significance to study the internal energy transfer, deep thermal state, thermal evolution, and deep-sea resource distribution of the earth.[1,2,3,4,5]
On the process of test, no pressure leakage happened and after the systems taken out, no obvious deformation found, indicating that the probe and electronic cabin structure are safe to install on the basket of the Jiaolong manned underwater robot
A kind of deep-sea temperature gradient detector that could be installed on Jiaolong manned underwater robot is developed
Summary
The temperature gradient of seabed sediments is an important parameter to describe the thermal state of seabed sediments, which is of great significance to study the internal energy transfer, deep thermal state, thermal evolution, and deep-sea resource distribution of the earth.[1,2,3,4,5] An additional function is for establishing heat flow, which is a vital component of calculating thickness of the gas hydrate stability zone.The submarine temperature gradient is normally detected by inserting a slender metal cylinder equipped with temperature sensors into the seafloor sediment during operation. Keywords Manned underwater robot, temperature gradient, ANSYS simulation, in-situ measurement, pressure resistance test
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