Piecewise linear method for analyzing supercavitation navigation body kinetic characteristics

A supercavitation vehicle and body dynamics technology, applied in fluid dynamics tests, machine/structural component tests, instruments, etc.
CN103558009AInactive Publication Date: 2014-02-05NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2014-02-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A piecewise linear method for analyzing supercavitation navigation body kinetic characteristics includes the steps that step1, a supercavitation navigation body kinetic model is built; step2, piecewise linear fitting is performed on a non-linear sliding force function in the supercavitation navigation body kinetic model to obtain a linear sliding force function; step3, parameters of the supercavitation kinetic model are set; step4, the supercavitation kinetic model with the piecewise linear sliding force Fp function is adopted for obtaining a sole balance point of a supercavitation navigation body, linearization is performed on a system at the balance point to obtain a jacobian matrix of the system and a characteristic equation at the balance point, characteristic values of the system are obtained, and the balance point of the system is judged to be an unstable saddle focus. By the adoption of the piecewise linearization of the sliding force function, the supercavitation navigation body kinetic model is simplified, so that the balance point position and stability conditions of the model have concise analytical expressions, and the supercavitation navigation body kinetic characteristics are analyzed more conveniently.
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Description

technical field

[0001] The invention relates to a piecewise linear method for analyzing the dynamic characteristics of a supercavitating vehicle, in particular to a piecewise linear method for analyzing the dynamic characteristics of an underwater supercavitating vehicle. Background technique

[0002] At present, underwater vehicle technology has received widespread attention worldwide. Among them, the underwater supercavitation vehicle technology has attracted much attention.

[0003] Specifically, the so-called "supercavitation vehicle" means that when the vehicle sails at high speed underwater, due to the Bernoulli effect, the liquid around the vehicle is vaporized, resulting in a supercavitation that covers most of the surface of the vehicle. The supercavitation isolates the vehicle from the water, so it can reduce the resistance of the vehicle in the water and greatly increase the speed and distance of the vehicle.

[0004] When the supercavitating vehicle is navigati...

Claims

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