Practical examples of vibration analysis onboard ships and on offshore structures

摘要

Most practical engineers have, at some time or other, experienced difficulty in determining the cause of a problem on a machine or structure. Consequently, the machines or structures have been dismantled for a more detaile'd examination to try and establish the reasons for the trouble. However, sometimes even detailed examination of the component parts has not revealed the nature of the problem. Vibration analysis techniques present an alternative method to stripping machines or structures unnecessarily, and the methods and instrumentation have been developed to allow the majority of machine and structural problems to be identified. This has led to on-site troubleshooting and in-position balancing for both the marine and offshore industries. Over the years, numerous specific problems on rotating machines, structures and pipework have been examined, and a selection of case histories, showing the measuring and analysing techniques which lead to the solution of a problem, are discussed in this paper.