Mathematical model of power loss in reducing gear box on shipunder arbitrary steady operating condition

In order to analyze and derive the mathematical model of power loss in the reducing gear box on naval ships under arbitrary steady operating conditions, this paper first cites and introduces two types of test curves of the power loss in reducing gear box under two special steady operating conditions. Then the physical meaning of one type of the test curves and some special points on this curve are analyzed, and from the test curve the mathematical formulae for calculating the power loss in (reducing) gear box under arbitrary steady operating condition are derived. And the same approach is applied to the other type of the test curves. Lastly a doubtful point of power loss test curves in the (reducing) gear box, which seems paradoxical to readers, is stated and explained.