Abstract
The economic evaluation for the adaption of the new machineries and system is usually made from the view point of the pay-off time by the ordinary methods with a few parameters such as investiment cost, fuel cost, maintenance cost, etc.
In this paper, the Authors propose one of the more proper methods of the evaluation with new concept taking into account maintainability, reliability, noise, vibration, manoeuvability, maintenance time, etc.
By the introduction of the new method, the more minute analysis can be expected.
