碩士 / 中央警察大學 / 水上警察研究所 / 99 / Hull vibration often causes mechanical parts to break down. Vibration also causes noises to the discomfort of crewmen, passengers, and imposes safety concern on the vessel. For coastguard personnel, vessels are not only lodging facility, but mandatory means for their duties. Coastguard duties require several high-powered engines to be provided in the engine room. High-powered engines cause resonance and noises, annoying crewmen at rest and thereby deteriorating their response to emergencies. According to the analysis of accidents occurring to coastguard vessels over the past years, human errors have caused a large number of accidents. Apparently, human errors will be minimized if the influence on crewmen’s comfort imposed by hull vibration and noises is minimized.
The international ship vibration and noise specifications were formulated in accordance with the physical properties measured by instruments without consideration to the timeframe of human body’s exposure to vibration and noises. Therefore, the specifications are not sufficient to reflect the coastguard personnel’s duties and mental needs. R.O.C. Coast Guard began to commission 1000-ton offshore patrol vessels in 2011. This study intends to examine the influence imposed by hull vibration and noises on personnel-on-duty using data obtained from spot measurement and questionnaires, meanwhile analyzes the applicability of criteria using objective and subjective survey results. The purpose of this study is to present an economic and feasible guideline with emphasis on the issues arising from vibration and noises in order to upgrade coastguard patrol efficiency by improving the living conditions and working conditions of vessels.
This study has drawn conclusions as follows: (1) According to spot measurement of vibration and noises, patrol vessel’s cabin area, working area and living area are constructed compliant with relevant criteria. The survey reveals, however, noises impose more negative influence than vibration does. Most onboard personnel are not satisfied with the vibration and noises in those areas, especially cabin area and working area. Dissatisfaction is likely to ruin the coastguard personnel’s efficiency and their response to emergency. (2) In an effort to avoid the influence imposed by waves on the small and medium vessels, this study recommends assessment to be made using the weighted root mean square (R.M.S.) stipulated in the new regulations and the maximum repetitive value (MRV) stated in the old regulations simultaneously. (3) The international ship vibration and noise specifications are not perfect. Nonetheless, this study recommends that, before official vessels’ assessment criteria are formulated, comfort assessment has to be conducted in accordance with the present specifications based on vessels’ different speeds. Thus, a unified standard is still available for the vessels. (4) Noises and vibration affect personnel at rest and on duty substantially. Therefore, this study proposes an economic solution that requires the responsible entity to upgrade noise and vibration preventions for cabin area from the time the entity designs the vessel until the vessel is delivered. If vibration and noises are found after delivery, spot measurement and analysis will be needed to solve the problems, meaning too many tasks and too much cost to solve the problems.
| Identifer | oai:union.ndltd.org:TW/099CPU05670012 |
| Creators | Chiu Po-Wen, 邱博文 |
| Contributors | 劉春暉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 217 |
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