碩士 / 國立成功大學 / 系統及船舶機電工程學系碩博士班 / 93 / The main purpose of this thesis is to establish an automatic float system that can carry various kinds of sensors to measure the hydrological data of sea-water at different level of depth. This system contains a pressure vessel within which a buoyancy control system, electric powers, computer, PLC controller, GPS antenna and wireless device are constructed.
To design and manufacture an appropriate pressure vessel, related reference papers are surveyed and confirmations of its feasibility are carried out through experiments. The buoyancy control system includes a stepping motor, a liner screw and a piston. When the piston is pulled back a maximum lost of 0.5kg of buoyancy make the vessel dive. Conversely, the vessel floats up as the piston is pushed out.
As to the hydrological data, with the use of pressure gage to sense the depth and thermal couple to catch the corresponding temperature are executed on both diving process and float-up process. When vessel arrives sea bottom the power will switch off automatically to safe the electric power and to elongate the work duration. After preset hours pass, the power switch will boot up again and proceed to float-up process. When the vessel ascents to sea surface GPS antenna receives the longitude and latitude data automatically. The collected data include depth, temperature and position will then send back to command station through wireless device. Also the wireless device is capable to receive new command sent from the command station. In this manner, without recovering the vessel from the sea area, one can easily change the operation style whenever the vessel is floating on the sea surface.
The main control kernel of the system includes a personal computer, a PLC controller and control software. The software contains two different programs. The Labview 7.0 program is for computer and the other is for PLC controller.
Individual function test for each sub-system is carried out and find out that every sub-system works correctly. In the next step, these sub-systems will be put together to confirm its entire performance. After laboratory tests, field tests will be conducted next year.
| Identifer | oai:union.ndltd.org:TW/093NCKU5345028 |
| Date | January 2005 |
| Creators | Ping-Ju Chang, 張平儒 |
| Contributors | Chung-Hung Lin, 林忠宏 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 163 |
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