scholarly journals Automatic Control of Ship Motion Conducting Search in Open Waters

2020 ◽  
Vol 27 (4) ◽  
pp. 157-169
Author(s):  
Krzysztof Stefan Kula
Keyword(s):  
Ship Motion ◽  
Search Pattern ◽  
Ship Model ◽  
Function Block ◽  
Search Area ◽  
Operation Support System ◽  
Search Operation ◽  
High Control ◽  
Straight Lines ◽  
Control Accuracy

AbstractIn this work a search operation support system is presented, which is an additional autopilot function block. Its task is to lead a vessel included in the search by the SAR services to the datum position on the basis of the data entered by the operator into the system and then automatically to search the indicated area according to the newly defined search pattern. The set goal can be achieved thanks to the autopilot that guides the ship along a given trajectory consisting of straight lines and arcs. High control accuracy is provided by the IMC control system using a relatively simple non-linear ship model. The simulation tests of the tanker model confirmed that the indicated search area can be precisely checked in a shorter time than when using the expanding square search pattern.

scholarly journals Control system for trials on material ship model

2012 ◽  
Vol 19 (Special) ◽  
pp. 25-30 ◽  
Author(s):  
Janusz Pomirski ◽  
Andrzej Rak ◽  
Witold Gierusz
Keyword(s):  
Control System ◽  
Control Systems ◽  
Virtual Environment ◽  
Motion Control ◽  
Ship Motion ◽  
Matlab Simulink ◽  
Ship Model ◽  
Measurement Devices

ABSTRACT The paper presents software environement for fast prototyping and verification of motion control systems for ship. The environement is prepared for isomorphic reduced ship model which is used for training and in research in a area of ship motion control. The control system is build using Matlab-Simulink-xPC package which simplifies and accellerates design and verification of new control algorithms. The systems was prepared also for Hardwarein- the-loop trials when a designed control system is tested inside a virtual environment instead of real actuators, disturbances, communication and measurement devices.

Demonstration of a Novel Smart Structural System for Pointing Control of Trusses

2016 ◽  
Author(s):  
Takeshi Shimada ◽  
Kosei Ishimura ◽  
Taro Kawano
Keyword(s):  
Feasibility Study ◽  
Large Scale ◽  
Control Mechanism ◽  
Displacement Sensor ◽  
Internal Displacement ◽  
Experimental Demonstration ◽  
Structural System ◽  
High Control ◽  
Pointing Control ◽  
Control Accuracy

We designed and developed a novel smart structural system for pointing control of large-scale support structures, such as trusses. The system consists of a pointing control mechanism, an internal displacement-sensor, and a controller. Remarkable points of our system are (1) artificial thermal expansion of truss members is utilized as linear actuators, (2) elastic hinges are applied instead of boll joints, and (3) the internal displacement-sensor which does not need external jigs and has high measuring accuracy is applied. In this paper, we conducted the feasibility study and the experimental demonstration. As a result of the feasibility study, the proposed pointing control mechanism can produce several hundred arcseconds of the rotational displacements within three minutes, therefore it has potential for using in practical operations. As a result of the experimental demonstration, we confirmed that the hysteresis of the pointing control mechanism can be kept sufficiently small due to the absence of the sliding parts, and has high control accuracy and followability (the error RMS value for a circle of the radius of 500 μm is 3.6 %).

Automobile Air-Conditioner Control System Based on STC12C5A60S2 Single-Chip Microcontroller

2012 ◽  
Vol 614-615 ◽  
pp. 635-639
Author(s):  
Shu Sheng Xiong ◽  
Lian Xie ◽  
Sheng Kai Zhou ◽  
Xiao Shuai Ren ◽  
Jin Xu
Keyword(s):  
Control System ◽  
Software Design ◽  
Hardware Design ◽  
Conversion Function ◽  
Air Conditioner ◽  
Single Chip ◽  
Important Indicator ◽  
Automobile Air Conditioner ◽  
High Control ◽  
Control Accuracy

Recent years, automobile air-conditioner control system is particularly important as the automobile air-conditioner is becoming an important indicator to measure the comfort of a car. This paper introduces the hardware and software design of the system based on STC12C5A60S2 microcontroller.The hardware design part includes the circuits design of motor and fan, and the software design part describes the way to realize the modes conversion function. Experiments show that the automobile air-conditioner system can reach high control accuracy and it's practical.

Influence of Silicon Controlled Rectifier Voltage Regulation Device under DDC-Temperature Control

2013 ◽  
Vol 706-708 ◽  
pp. 826-829
Author(s):  
Ya Ping Lu ◽  
Tian Lin Song ◽  
Hai Qing Liu
Keyword(s):  
Temperature Control ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Regulation ◽  
Power Source ◽  
Control Device ◽  
Temperature Control System ◽  
Trigger Pulse ◽  
High Control ◽  
Control Accuracy

In the boiler heating control device of combining DDC and the silicon controlled rectifier voltage regulation device, there are phase shift trigger, pulse width modulation (PWM) and cycle wave cross zero trigger (CYC). Under the different silicon controlled rectifier voltage regulation devices, there are different influences for DDC. It makes the best of the cycle characteristics of the alternating current (AC) for the cycle wave cross zero trigger (CYC). For DDC - temperature control system, there are advantages of high control accuracy, less interference and power source pollution.

scholarly journals Research on Anti-Skid Control Strategy for Four-Wheel Independent Drive Electric Vehicle

2021 ◽  
Vol 12 (3) ◽  
pp. 150
Author(s):  
Chuanwei Zhang ◽  
Jian Ma ◽  
Bo Chang ◽  
Jianlong Wang
Keyword(s):  
Electric Vehicles ◽  
Control Strategy ◽  
Simple Structure ◽  
Slip Rate ◽  
Development Trend ◽  
Experimental Simulation ◽  
Dynamics Model ◽  
Fuzzy Pid Control ◽  
High Control ◽  
Control Accuracy

Four-wheel independent drive electric vehicles have become the latest development trend of electric vehicles due to their simple structure and high control accuracy. Aiming at the sliding problem of four-wheel independent driving electric vehicles in the driving process, a driving anti-skid control strategy is designed. The strategy includes two contents: (1) a road recognition module that tracks the best slip rate in real time; (2) a slip rate control module that uses fuzzy PID control. Then, based on Carsim and MATLAB/Simulink, the vehicle dynamics model, tire model and driving anti-skid control model are established. A simulation of the driving anti-skid control algorithm is carried out to verify the feasibility of the control strategy. Finally, based on the built-up dSPACE semi-physical experimental simulation platform, the verification was carried out, and the test and simulation results were compared to verify the effective feasibility of the driving anti-skid control strategy.

scholarly journals Analysis and design of auto-adaptive leveling hydraulic suspension for agricultural robot

2021 ◽  
Vol 18 (5) ◽  
pp. 172988142110406
Author(s):  
Kai Hu ◽  
Wenyi Zhang ◽  
Bing Qi
Keyword(s):  
Mountain Areas ◽  
Load Pressure ◽  
Analysis And Design ◽  
Load Sensing ◽  
Sensing System ◽  
Walking Performance ◽  
High Control ◽  
Control Accuracy ◽  
Agricultural Robot

The application of agricultural robot in hilly and mountain areas faces several problems, such as bad walking performance, easy tilt, and low safety. The auto-adaptive leveling hydraulic suspension for the agricultural robot can help to eliminate some sort of problems. The design of such system is the main aim of the article. The hydraulic system with load-sensing system and its controlling model were established and then the load-sensing system was modeled and simulated in Advanced Modeling Environment for SIMulation. The optimal proportional–integral–derivative parameters were determined by the optimized algorithm. The simulation results illustrated that the inlet and outlet pressure difference of throttle and the flow rate through throttle are 42 bar and 29.65 L/min, respectively, all the time when the load pressure varies from 0 bar to 100 bar. The load-sensing system has good power follow-up and high control accuracy. And then the experimental bench of auto-adaptive leveling hydraulic suspension was researched and developed to verify the leveling performance. The experimental results demonstrate that auto-adaptive leveling hydraulic suspension can keep frame leveling dynamically on upslope, downslope, side slope, and continuous undulating road surface. The maximum errors of the pitch angle and the tilt angle are −0.93° and 0.97°. The feasibility of the designed hydraulic suspension was verified. The research methods in this article can provide theoretical basis for the design of other auto-adaptive leveling systems in hilly and mountain areas.

scholarly journals Design and development of route planner for Unmanned Surface Vehicles

2017 ◽  
Vol 11 (21) ◽  
pp. 89
Author(s):  
Vladimir Díaz Charris ◽  
Juan A. Contreras Montes
Keyword(s):  
Simulation Model ◽  
Search Pattern ◽  
Design And Development ◽  
Unmanned Surface Vehicles ◽  
Design And Implementation ◽  
Search Area ◽  
Pattern Speed ◽  
Towed Array

This paper describes the development of a route planner for Unmanned Surface Vehicles (USVs) focused on the study of an operational scenario for a specific mission – Anti-Submarine Warfare (ASW). Through the design and implementation of a simulation model, the effect of the different factors that particularly influence ASW is analyzed, such as search pattern, speed and sensor type; dipping sonar or towed array sonar (TAS). By obtaining a measurement of effectiveness, the USV’s response in the deployment of this type of mission can be defined using time to detect the threat in a search area, as parameters to measure the performance.

Research of Detection and Control System for Lunar Dust Effects Simulator

2012 ◽  
Vol 426 ◽  
pp. 126-130
Author(s):  
Zhi Rong Liao ◽  
Liang Zhou ◽  
D. Gao ◽  
X.L. Zhang ◽  
M.L. Yin
Keyword(s):  
Control System ◽  
Stepper Motor ◽  
Motor Speed ◽  
Lunar Dust ◽  
Convolution Filter ◽  
Speed Up ◽  
High Control ◽  
Dust Effects ◽  
And Control ◽  
Control Accuracy

To simluate the effects of lunar dust environment veritably by using lunar dust effects simulator, a detection and control system based on singlechip microcomputer was developed. In this system, peripheral circuits with stepper motor driver, temperature sensor and rotary transformer were used to collect the signals and control the temperature as well as speed. Stepper motor speed up/down curve, digital convolution filter and error compensation were adhibited for improving the system accuracy. The results showed that this method was simple, reliable and had high control accuracy.

Multizone barrel temperature control of the eccentric rotor extrusion process

2020 ◽  
Vol 40 (3) ◽  
pp. 247-255
Author(s):  
Sheng-Ping Wen ◽  
Pei-Feng Hong ◽  
Pei-Hui Huang
Keyword(s):  
Learning Algorithm ◽  
Pso Algorithm ◽  
Extrusion Process ◽  
Screw Extruder ◽  
Novel Structure ◽  
Eccentric Rotor ◽  
High Control ◽  
Self Learning ◽  
Weight Coefficients ◽  
Control Accuracy

AbstractThe eccentric rotor extruder is a new kind of extrusion equipment with novel structure and outstanding engineering performance. As the structure of the eccentric rotor extruder is different from that of the traditional screw extruder, the control of the barrel temperature becomes important, including avoiding the influence of heating coupling and achieving high control accuracy. A neuron proportional-integral-derivative (neuron-PID) control algorithm of barrel temperature for the eccentric rotor extruder is introduced. The neural self-learning algorithm is able to tune PID parameters online, and the particle swarm optimization (PSO) algorithm is adopted to optimize the initial weight coefficients of the neuron. The experimental results show that the PSO-neuron-PID controller has the advantages of low overshoot and high control accuracy, and the influence of heat coupling can be counteracted effectively.

Study on Process Control Characteristics of 22MN Fast Forging Hydraulic Press

2011 ◽  
Vol 201-203 ◽  
pp. 2258-2262 ◽  
Author(s):  
Jing Yao ◽  
Xiang Dong Kong
Keyword(s):  
Process Control ◽  
Raw Materials ◽  
Rapid Development ◽  
Negative Influence ◽  
Hydraulic Press ◽  
Control Precision ◽  
High Control ◽  
Press Performance ◽  
And Control ◽  
Control Accuracy

With the rapid development of modern industry, more and more high requirements for forging velocity and control precision have been proposed. Because it can not only increase productivity, but also can reduce the loss of the workpiece and save raw materials. Due to some characteristics such as high pressure, large flow, heavy moving inertia and so on, the process control performance of the fast forging hydraulic presses often have difficulty in their coordination between rapidity and stability, large shock during pressure relief and flow relief, low control accuracy and high accident rate. To overcome the negative influence and improve forging press performance, it is important to design forging curve. 22MN fast forging hydraulic press adopts electro-hydraulic proportional control system, the simulation and test results approved that the fast forging hydraulic press has high control accuracy and works stably without shock.

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