In recent years,because of the development of new underwater weaponwith long navigation time and distance,navigation reliability assessment method which based on success or failure often in tests is debated.One side,utilizing short navigation test data to assess reliability doesn’t consider the navigation time resulting in the low trustiness,on the other hand,performing adequate long navigation reliability tests is not only restricted on expenditure,development period and high risk,but also affected by the divorce from the other functionality and performance test,which brings about the low test efficiency and the insufficiency of data using.Therefor,based on the mission performing mode and combined with the exponential reliability distribution of underwater weapons,a method for actual navigation reliability test and assessment is proposed,which gives consideration to feasibility and practicability requirments and is adaptable to reliability engineering practice of underwater weapons.

Torpedo working reliability assessment comes up against the condition of lacking sample, because of increasingly long lifetime and restricted reliability test by expenditure. In recent years, technical experts usually mine prior data combined with reliability test data to solve the problem using Bayes method. Considering that the existing prior data acquiring doesn't cover the performance reliability information, the Bootstrap simulation method is used to obtain the performance data as the prior data utilized by Bayes reliability method, which tremendously relieves the influence of lacking prior information on reliability assessment and has practical engineering value.