Three-Channel Control for the Depth of AUV and its Dynamic Performance Simulation

2013 ◽  
Vol 313-314 ◽  
pp. 1064-1068
Author(s):  
Peng Hua Teng ◽  
Yu Wen Zhang ◽  
Er Hu Hou
Keyword(s):  
Closed Loop ◽  
Autonomous Underwater Vehicle ◽  
Dynamic Performance ◽  
Underwater Vehicle ◽  
Closed Loop Control ◽  
Dynamic Features ◽  
Loop Control ◽  
Loop Control System ◽  
The Stability ◽  
Channel Control

The autonomous underwater vehicle can be affected by sea flow and other factors when in a motion to a certain fixed depth. To guarantee the stability of cruise trajectory of autonomous underwater vehicle and considering the influence of sea flow on its motion, the underwater six-free-degree motion mathematical model for the vehicle is established in combination with the sea flow model. Besides, dynamic features of the longitudinal plane, horizontal plane and crosswise-rolling of the vehicle at different navigation speeds are simulated with the three-channel closed-loop control system. The simulation result indicates that the vehicle can move stably at a certain depth and with the achieved accuracy by means of closed-loop control.

Research on Closed-Loop Control of the Step Response

2011 ◽  
Vol 127 ◽  
pp. 71-76 ◽  
Author(s):  
Xin Ping Wang ◽  
Jian Jun Dang ◽  
Zhi Cao Zhao
Keyword(s):  
Closed Loop ◽  
Dynamic Performance ◽  
Thermal Power ◽  
Step Response ◽  
Closed Loop Control ◽  
Loop Control ◽  
Intermediate Variable ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Control System Model

Based on the analysis of six kinds of working points, the process function of torpedo thermal power propulsion system is solved. The results show that the process transfer function is approximate to inertial link. PI control algorithm is presented and its parameters are deduced. The algorithm can not only control the output variables, but also can monitor the intermediate variable. Closed-loop control system model is established. Variable speed characteristics of torpedo at constant depth and steady speed characteristics in depth-changed process are simulated by MATLAB. Simulation results indicate that the system has satisfactory dynamic performance and the control quality performs well.

A New Reliability Analysis Method Based on Stability Reliability for Closed-Loop Control System

2012 ◽  
Vol 544 ◽  
pp. 115-120
Author(s):  
Xiao He Guo ◽  
Zong Xia Jiao ◽  
Shao Ping Wang
Keyword(s):  
Control System ◽  
Reliability Analysis ◽  
Closed Loop ◽  
Necessary Condition ◽  
Closed Loop Control ◽  
Analysis Method ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
The Stability

Considering stability is the necessary condition for closed-loop control system to work properly, a new function reliability analysis method by inducting and defining the concept of stability reliability was proposed to describe the function reliability of closed-loop control system completely. As an example, the stability reliability calculation method and process to analyze the function reliability of a flight autopilot were demonstrated.

scholarly journals Closed-loop control system for well-defined oxygen supply in micro-physiological systems

2017 ◽  
Vol 3 (2) ◽  
pp. 363-366
Author(s):  
Tobias Steege ◽  
Mathias Busek ◽  
Stefan Grünzner ◽  
Andrés Fabían Lasagni ◽  
Frank Sonntag
Keyword(s):  
Control System ◽  
Oxygen Supply ◽  
Closed Loop ◽  
Microfluidic System ◽  
Closed Loop Control ◽  
Loop Control ◽  
Cell Vitality ◽  
Closed Loop Control System ◽  
Loop Control System

AbstractTo improve cell vitality, sufficient oxygen supply is an important factor. A deficiency in oxygen is called Hypoxia and can influence for example tumor growth or inflammatory processes. Hypoxia assays are usually performed with the help of animal or static human cell culture models. The main disadvantage of these methods is that the results are hardly transferable to the human physiology. Microfluidic 3D cell cultivation systems for perfused hypoxia assays may overcome this issue since they can mimic the in-vivo situation in the human body much better. Such a Hypoxia-on-a-Chip system was recently developed. The chip system consists of several individually laser-structured layers which are bonded using a hot press or chemical treatment. Oxygen sensing spots are integrated into the system which can be monitored continuously with an optical sensor by means of fluorescence lifetime detection.Hereby presented is the developed hard- and software requiered to control the oxygen content within this microfluidic system. This system forms a closed-loop control system which is parameterized and evaluated.

Adaptive synchronization of uncertain fractional-order chaotic systems using sliding mode control techniques

2019 ◽  
Vol 234 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Bahram Yaghooti ◽  
Ali Siahi Shadbad ◽  
Kaveh Safavi ◽  
Hassan Salarieh
Keyword(s):  
Control System ◽  
Sliding Mode Control ◽  
Fractional Order ◽  
Chaotic Systems ◽  
Closed Loop ◽  
Sliding Mode ◽  
Closed Loop Control ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System

In this article, an adaptive nonlinear controller is designed to synchronize two uncertain fractional-order chaotic systems using fractional-order sliding mode control. The controller structure and adaptation laws are chosen such that asymptotic stability of the closed-loop control system is guaranteed. The adaptation laws are being calculated from a proper sliding surface using the Lyapunov stability theory. This method guarantees the closed-loop control system robustness against the system uncertainties and external disturbances. Eventually, the presented method is used to synchronize two fractional-order gyro and Duffing systems, and the numerical simulation results demonstrate the effectiveness of this method.

A High-Frequency Inverter Based on Double Closed-Loop Control

2012 ◽  
Vol 241-244 ◽  
pp. 509-512
Author(s):  
Lin Yang ◽  
Gen Wang Liu
Keyword(s):  
High Frequency ◽  
Closed Loop ◽  
Control Structure ◽  
Dynamic Performance ◽  
Current Loop ◽  
Closed Loop Control ◽  
Voltage Waveform ◽  
Loop Control ◽  
Static Performance ◽  
Frequency Inverter

In order to improve the dynamic performance of inverter and the output voltage waveform quality, the double-loop control combination with internal current loop and external voltage loop is introduced. The inner loop is used for improving the dynamic performance of the system and rapidly eliminating the effects of load disturbance; the outer loop is used for improving static performance of the system. In the end, MATLAB / Simulink is carried out to build the system model and prove the feasibility of the dual closed-loop control structure in this paper.

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