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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.

Inactive Publication Date: 2014-02-05
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the research on the dynamic characteristics of the closed-loop control of supercavitating vehicles is still blank in the industry.

Method used

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  • Piecewise linear method for analyzing supercavitation navigation body kinetic characteristics
  • Piecewise linear method for analyzing supercavitation navigation body kinetic characteristics
  • Piecewise linear method for analyzing supercavitation navigation body kinetic characteristics

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Embodiment Construction

[0058] Please refer to Figure 1a , 1b , 1c. The structure and dimensions of the supercavitating vehicle are as follows: Figure 1aAs shown, the vehicle with length L in the figure is composed of two sections: a cylindrical section with a length of 2 / 3L at the rear end and a radius R, and a conical section with a length of 1 / 3L at the front end. For this aircraft model, the distance between the center of gravity CG and the head is 17 / 28L. The vehicle is equipped with a cavitator at the head and an empennage at the rear. The cavitator can be viewed as a radius R n disc.

[0059] The force acting on the vehicle body mainly includes the lift force F on the cavitator cavitator , the lift F on the empennage fins , the sliding force F generated by the interaction between the tail and the cavity wall planing , and the gravity F at the center of mass of the vehicle gravity .

[0060] The dynamic modeling of supercavitating vehicle uses four state variables to describe the dyna...

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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.

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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Application Information

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IPC IPC(8): G01M10/00
Inventor 熊天红陈耀慧
Owner NANJING UNIV OF SCI & TECH
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