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This paper describes a dynamics model of a underwater glide vehicle. And a accurate model for calculating fluid dynamics of glide hydrofoil is also incorporated into the simulation. The model is used to simulate the glide motion of the underwater glide vehicle which is propelled and controlled through changing the gravity and location of gravity. The simulation results indicate that the underwater...
The bionic flapping hydrofoil propulsion, as a new propulsion mode, is different with the traditionary screw propeller, and it has attract the interest of the technologist in the aeronautics, astronautics and marine field. The underwater bionic flapping hydrofoil propeller is a system which can produce the thrust and can also produce the control force. This paper describes a hydrodynamics model of...
Control of UUV is performed in various methods. he fuzzy controller in a noisy environment had a significantly better performance compared by PID controller. This paper built the appropriate motion math model for the UUV the model for UUV's fuzzy control. Than the UUV which controlled by PID controller and controlled by the fuzzy controller are simulated. The results shows that the UUV can be steadily...
The Bayesian method is adopted as an important and suitable approach to the small sample reliability analysis and evaluation, which can use all kinds of the system information. How to acquire proper prior distribution is a key problem in system’s Bayesian reliability evaluation. The reliability growth Bayesian method for the Gompertz model was proposed, which only using rank matrix and quantile to...
The ocean current is a disturb force when the autonomous underwater vehicle (AUV) navigating in the sea, it can induce the position change of the dynamic positioning AUV, so it can effect the low velocity maneuvers of the torpedo-shaped long-distance AUV. The appropriate motion math model for the torpedo- shaped long-distance AUV was built and the model for AUV’s ocean current disturb force was built...
Based on the analysis of the common method of the maintainability allocation, and for the sake of overcome the limitation of the common method--"maintainability allocation method which is pro rata for the failure rate and characteristic of design" when the design character is feckly, the method of "maintainability allocation method which is pro rata for the failure rate and characteristic...
In a complex system, schemes are affected by lots of factors. The evaluation must take all the factors into account. The nature of the factors are fuzzy and grey, this paper apply grey relational analysis and entropy weights into fuzzy design theory, and solve the problem of three levels structure fuzzy comprehensive evaluation. A practical example of torpedo is showed to prove the validity of the...
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