Research of Closed-Loop Control for Underwater Heat-Engine Propulsion System

Closed-loop control for underwater heat-engine propulsion system is an essential solution to improve the control performance and optimize the autonomous underwater vehicles (AUV) trajectory. This paper minutely gives the project of the closed-loop control proposal we propose for the propulsion system, and puts forward a control arithmetic according to the mathematical model that has been build for the system. Even more remarkable is that a series of experiments are carried out on the semi-physical simulation test bench to verify the control arithmetic. The experimental results and the analysis indicate convincingly that the control arithmetic can compensate for the navigation depth and attitude of AUV, thus making the propulsion system get the ability of tracking the variable working condition. Therefore, the power system gives full play to its potential.

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Design and Modelling of a Novel Servovalve Actuated by a Piezoelectric Ring Bender

ASME/BATH 2015 Symposium on Fluid Power and Motion Control ◽

10.1115/fpmc2015-9576 ◽

2015 ◽

Cited By ~ 8

Author(s):

L. Johan Persson ◽

Andrew R. Plummer ◽

Christopher R. Bowen ◽

Ian Brooks

Keyword(s):

Mathematical Model ◽

Closed Loop ◽

Position Control ◽

Open Loop ◽

Closed Loop Control ◽

Hydraulic Fluid ◽

Loop Control ◽

Frequency Responses ◽

Spool Valve ◽

The Mathematical Model

This paper describes the design, simulation and testing of a piezoelectric spool valve. An actuator has been connected to the valve and tested under closed loop control. A mathematical model of the valve was produced and a prototype of the valve was tested. The mathematical model is validated against the experimental data. Step and frequency responses for both the valve and actuator are presented. It was found that displacement of the hydraulic fluid by the ring bender had an impact on the valve performance. To reduce the effect of the piezoelectric hysteresis, closed loop spool position control was evaluated. A noticeable difference can be observed between open loop and closed loop performance.

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AUV Adaptive Sampling Methods: A Review

Applied Sciences ◽

10.3390/app9153145 ◽

2019 ◽

Vol 9 (15) ◽

pp. 3145 ◽

Cited By ~ 13

Author(s):

Jimin Hwang ◽

Neil Bose ◽

Shuangshuang Fan

Keyword(s):

Adaptive Sampling ◽

Closed Loop ◽

Sampling Methods ◽

Autonomous Underwater Vehicles ◽

Underwater Vehicles ◽

Future Research ◽

Closed Loop Control ◽

Loop Control ◽

State Changes

Autonomous underwater vehicles (AUVs) are unmanned marine robots that have been used for a broad range of oceanographic missions. They are programmed to perform at various levels of autonomy, including autonomous behaviours and intelligent behaviours. Adaptive sampling is one class of intelligent behaviour that allows the vehicle to autonomously make decisions during a mission in response to environment changes and vehicle state changes. Having a closed-loop control architecture, an AUV can perceive the environment, interpret the data and take follow-up measures. Thus, the mission plan can be modified, sampling criteria can be adjusted, and target features can be traced. This paper presents an overview of existing adaptive sampling techniques. Included are adaptive mission uses and underlying methods for perception, interpretation and reaction to underwater phenomena in AUV operations. The potential for future research in adaptive missions is discussed.

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Modeling and simulation of all-electric propulsion system with three-closed loop control

Journal of Computational Methods in Sciences and Engineering ◽

10.3233/jcm-204432 ◽

2020 ◽

pp. 1-15

Author(s):

Hongqian Hu ◽

Weifeng Shi

Keyword(s):

Modeling And Simulation ◽

Electric Propulsion ◽

Closed Loop ◽

Propulsion System ◽

Closed Loop Control ◽

Loop Control ◽

Electric Propulsion System

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The Impact of Visual Feedback Type on the Mastery of Visuo-Motor Transformations

Zeitschrift für Psychologie ◽

10.1027/2151-2604/a000084 ◽

2012 ◽

Vol 220 (1) ◽

pp. 3-9 ◽

Cited By ~ 4

Author(s):

Sandra Sülzenbrück

Keyword(s):

Empirical Research ◽

Visual Feedback ◽

Closed Loop ◽

Motor Planning ◽

Visual Input ◽

Closed Loop Control ◽

Loop Control ◽

Feedback Type ◽

Effective Use ◽

The Impact

For the effective use of modern tools, the inherent visuo-motor transformation needs to be mastered. The successful adjustment to and learning of these transformations crucially depends on practice conditions, particularly on the type of visual feedback during practice. Here, a review about empirical research exploring the influence of continuous and terminal visual feedback during practice on the mastery of visuo-motor transformations is provided. Two studies investigating the impact of the type of visual feedback on either direction-dependent visuo-motor gains or the complex visuo-motor transformation of a virtual two-sided lever are presented in more detail. The findings of these studies indicate that the continuous availability of visual feedback supports performance when closed-loop control is possible, but impairs performance when visual input is no longer available. Different approaches to explain these performance differences due to the type of visual feedback during practice are considered. For example, these differences could reflect a process of re-optimization of motor planning in a novel environment or represent effects of the specificity of practice. Furthermore, differences in the allocation of attention during movements with terminal and continuous visual feedback could account for the observed differences.

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