Fold Catastrophe Characteristics of Pitch Supercavitating Vehicle at Certain Depth

2013 ◽  
Author(s):  
Zhao Xinhua ◽  
Sun Yao ◽  
Qi Zengkun ◽  
Bai Tao ◽  
Han Yuntao
Keyword(s):  
Supercavitating Vehicle ◽  
Fold Catastrophe

scholarly journals Design of RBF Adaptive Sliding Mode Controller for A Supercavitating Vehicle

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 39873-39883
Author(s):  
Wang Jinghua ◽  
Liu Yang ◽  
Cao Guohua ◽  
Zhao Yongyong ◽  
Zhang Jiafeng
Keyword(s):  
Sliding Mode ◽  
Sliding Mode Controller ◽  
Adaptive Sliding Mode ◽  
Adaptive Sliding Mode Controller ◽  
Supercavitating Vehicle

Nonlinear Control Design for a Supercavitating Vehicle

2009 ◽  
Vol 17 (4) ◽  
pp. 816-832 ◽  
Author(s):  
Xiaofeng Mao ◽  
Qian Wang
Keyword(s):  
Nonlinear Control ◽  
Control Design ◽  
Supercavitating Vehicle

scholarly journals Research on the control problem of actuator anti-saturation of supercavitating vehicle

2021 ◽  
Vol 19 (1) ◽  
pp. 394-419
Author(s):  
Tao Bai ◽  
◽  
Junkai Song
Keyword(s):  
High Speed ◽  
Controller Design ◽  
Robust Controller ◽  
Stable Motion ◽  
Supercavitating Vehicle ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Additional Control ◽  
Motion Range ◽  
Motion Performance

<abstract> <p>In the theoretical controller design of the High-Speed Supercavitating Vehicle (HSSV), there will always be the problem that the physical saturation limit has to be exceeded by the motion range of the actuator to satisfy the requirements of stable motion of the supercavitating vehicle. This paper proposes a solution which could satisfy the requirements of stable motion of the vehicle without saturation of the actuator. First of all, the rotation range of the actuator and the motion performance of the vehicle with robust controller are analyzed under the condition where saturation is neglected. Then, according to the analysis conclusion, the controller is improved by using linear active disturbance rejection control (LADRC) method, which provides the additional control component to reduce the rotation angle and rotation speed of the actuator. Finally, the simulation proves that the solution could realize the stable motion of vehicle without saturation of actuator.</p> </abstract>

A Contribution to Study on the Lift of Ventilated Supercavitating Vehicle With Low Froude Number

2010 ◽  
Vol 132 (11) ◽  
Author(s):  
Yu Kaiping ◽  
Zhou Jingjun ◽  
Min Jingxin ◽  
Zhang Guang
Keyword(s):  
Numerical Simulations ◽  
Froude Number ◽  
Lift Coefficient ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Gravitational Effect ◽  
Gas Leakage ◽  
Supercavitating Vehicle ◽  
Numerical Predictions ◽  
Low Froude Number

A ventilated cavity was investigated using three-dimensional numerical simulation and cavitation water tunnel experiments under the condition of low Froude number. A two-fluid multiphase flow model was adopted in numerical predictions. The drag between the different phases and gravitational effect, as well as the compressibility of gas, was considered in the numerical simulations. By comparing the ventilated coefficient computational results of three different turbulence models with the Epshtein formula, the shear-stress-transport turbulence model was finally employed. The phenomenon of double-vortex tube gas-leakage was observed in both numerical simulations and experiments. Based on the validity of the numerical method, the change law of the lift coefficient on the afterbody was given by numerical predictions and accorded well with experimental results. The cause for the appearance of an abrupt increase in lift was difficult to get from experiments for the hard measurement, whereas the numerical simulations provided some supplements to analyze the reasons. The distribution of lift coefficient on the afterbody had important significance to the design of underwater vehicles.

Practical Cascade Control for Supercavitating Vehicle

2021 ◽  
Author(s):  
Yu Zhou ◽  
Mingwei Sun ◽  
Jianhong Zhang ◽  
Lehua Liu ◽  
Zengqiang Chen
Keyword(s):  
Cascade Control ◽  
Supercavitating Vehicle

Robust control of a small-scale supercavitating vehicle: From modeling to testing

2018 ◽  
Vol 160 ◽  
pp. 412-424 ◽  
Author(s):  
David Escobar Sanabria ◽  
Roger E.A. Arndt
Keyword(s):  
Robust Control ◽  
Small Scale ◽  
Supercavitating Vehicle

Heading control of a novel finless high-speed supercavitating vehicle with an internal oscillating pendulum

2020 ◽  
pp. 107754632094834
Author(s):  
Mojtaba Mirzaei ◽  
Hossein Taghvaei
Keyword(s):  
High Speed ◽  
Degrees Of Freedom ◽  
Sliding Mode ◽  
Six Degrees Of Freedom ◽  
Supercavitating Vehicles ◽  
Supercavitating Vehicle ◽  
High Speeds ◽  
Heading Control ◽  
Heading Angle ◽  
Control Surfaces

High-speed supercavitating vehicles are surrounded by a huge cavity of gas and only a small portion of the nose and the tail of the vehicle are in contact with the water which leads to a considerable reduction in skin friction drag and reaching very high speeds. High-speed supercavitating vehicles are usually controlled by the cavitator at the nose which controls the pitch and depth of the vehicle and the control surfaces or fins which control the roll and heading angle of the vehicle using the bank-to-turn maneuvering method. However, control surfaces have disadvantages such as the high drag force and ineffectiveness due to the supercavity. Therefore, the purpose of the present study is to eliminate the fins from high-speed supercavitating vehicles and propose a new bank-to-turn heading control of this novel finless high-speed supercavitating vehicle which is composed of the cavitator at the nose and an oscillating pendulum as the internal actuator. Sliding mode control as a robust method is used for the six-degrees-of-freedom model of this finless high-speed vehicle against exposed disturbances. Some design criteria for the design of the internal pendulum in this finless supercavitating vehicle are presented for the damping coefficient, pendulum mass, and radius.

Non-Steady Planing and Advection Delay Effects on the Dynamics and Control of Supercavitating Vehicles

2011 ◽  
Author(s):  
Vincent Nguyen ◽  
Munther A. Hassouneh ◽  
Balakumar Balachandran ◽  
Eyad H. Abed
Keyword(s):  
Vehicle Dynamics ◽  
Underwater Vehicles ◽  
Cavitation Number ◽  
Delay Effect ◽  
Supercavitating Vehicles ◽  
Supercavitating Vehicle ◽  
Delay Effects ◽  
Dynamics And Control ◽  
Position And Orientation ◽  
And Control

Cavity-vehicle interactions play a significant role in the dynamics of supercavitating underwater vehicles. To date, in the vast majority of planing force models for supercavitating vehicle dynamics, a steady planing assumption is utilized, wherein the vehicle-cavity interaction is only dependent on the vehicle’s position relative to the cavity. In this work, a framework to properly account for the vehicle radial motions into and out of the fluid is presented. This effectively introduces damping or velocity related dependence into the planing force formulation. The planing force is applied to cavity sections that are described by a previous (or delayed) position and orientation of the cavitator. The physical basis for the advection delay and the expressions used to determine the vehicle immersion and immersion rate are presented. Analysis and simulations for the time-delayed, non-steady planing system are carried out, and the delay effect in this system is shown to be stabilizing for certain values of the cavitation number that is contrary to previous results that have assumed steady planing force models.

Low frequency sound produced by a ventilated supercavitating vehicle

2011 ◽  
Vol 330 (8) ◽  
pp. 1634-1643 ◽  
Author(s):  
S.A. Ho ◽  
M.S. Howe ◽  
A.R. Salton
Keyword(s):  
Low Frequency ◽  
Frequency Sound ◽  
Supercavitating Vehicle
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