The Design of Temperature and Humidity Control System in Multi Incubators Based on Fuzzy Control

2011 ◽  
Vol 130-134 ◽  
pp. 2400-2403
Author(s):  
Rui Lan Wang
Keyword(s):  
Fuzzy Control ◽  
Control Method ◽  
Control Algorithms ◽  
Hatching Rate ◽  
Hatching Time ◽  
Control Precision ◽  
Temperature And Humidity ◽  
High Control ◽  
Coupling Characteristics ◽  
Control Accuracy

Hatching systems requiring high control accuracy of temperature and humidity. Particularly temperature, small temperature change will significantly affect hatching time and hatching rate；and temperature and humidity is the controlled amount of interaction between two. Due to the coupling characteristics of temperature and humidity is difficult to establish a precise mathematical model, caused uncertainty in its control. Fuzzy control method witch proposed in this article will not only improve control precision, and to improve the robustness of control algorithms and adaptive capacity.

Study on Control Method of Smelting-Pool Width in TIG Welding Basded on Fuzzy Control

2011 ◽  
Vol 199-200 ◽  
pp. 1134-1139
Author(s):  
Yun Hai Hou ◽  
Er Shuai Li ◽  
Shi Hua Sun ◽  
Yu Bai
Keyword(s):  
Fuzzy Control ◽  
Control Method ◽  
Inert Gas ◽  
Aluminum Wire ◽  
Control Effect ◽  
Welding Seam ◽  
Control Precision ◽  
Manufacture Process ◽  
Edge Detecting ◽  
High Control

Aimed at the manufacture process of TIG( tungs-ten inert-gas) welding of copper-clad aluminum wire in enterprise, the methods of detecting and automatic tracking welding seam edge , detecting and automatic control smelting-pool width were studied and designed with fuzzy control in the paper. The experiment shows that the scheme has the advantages such as better control effect, high control precision and favorable stability.

scholarly journals Novel Fuzzy PID-Type Iterative Learning Control for Quadrotor UAV

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 24 ◽  
Author(s):  
Jian Dong ◽  
Bin He
Keyword(s):  
Fuzzy Control ◽  
Iterative Learning Control ◽  
Control Method ◽  
External Disturbance ◽  
Learning Control ◽  
Iterative Learning ◽  
System Stability ◽  
Learning Gain ◽  
Control Precision ◽  
Quadrotor Aircraft

Due to the under-actuated and strong coupling characteristics of quadrotor aircraft, traditional trajectory tracking methods have low control precision, and poor anti-interference ability. A novel fuzzy proportional-interactive-derivative (PID)-type iterative learning control (ILC) was designed for a quadrotor unmanned aerial vehicle (UAV). The control method combined PID-ILC control and fuzzy control, so it inherited the robustness to disturbances and system model uncertainties of the ILC control. A new control law based on the PID-ILC algorithm was introduced to solve the problem of chattering caused by an external disturbance in the ILC control alone. Fuzzy control was used to set the PID parameters of three learning gain matrices to restrain the influence of uncertain factors on the system and improve the control precision. The system stability with the new design was verified using Lyapunov stability theory. The Gazebo simulation showed that the proposed design method creates effective ILC controllers for quadrotor aircraft.

BLDC Motor Torque Ripple Control Using Self-Tuning PID Fuzzy Control System

2016 ◽  
Vol 851 ◽  
pp. 459-463 ◽  
Author(s):  
Chao Wang ◽  
Zhuang Li ◽  
Guang Qing Kang ◽  
Chun Yan Zeng
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
Pid Control ◽  
Torque Ripple ◽  
Static Characteristic ◽  
Bldc Motor ◽  
Fuzzy Control System ◽  
Control Precision ◽  
Self Tuning ◽  
High Control

In order to suppress the torque ripple of the BLDC motor, at the same time considering the nonlinear and uncertainty of the BLDC motor, this paper mainly proposes a self-tuning PID fuzzy algorithm to control the torque ripple. Self-tuning PID fuzzy control is integrating the advantages of PID control system and fuzzy control system, using the error and change of error as inputs, and adjustment of PID parameter on-line by fuzzy control rules. Self-tuning PID fuzzy has the advantages of flexible and adaptable, and also have the characteristics of traditional PID control system such as broad applicability and high control precision. The results of simulation show that the self-tuning PID fuzzy control can suppress the torque ripple of BLDC motor effectively, the optimization of the dynamic and static characteristic of the system, satisfying the requirements of system performance, the superiority and reliability of the control strategy was verified.

scholarly journals Optimal Control Method for HVAC Systems in Offices with a Control Algorithm Based on Thermal Environment

Buildings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 95 ◽  
Author(s):  
Sung-Kyung Kim ◽  
Won-Hwa Hong ◽  
Jung-Ha Hwang ◽  
Myung-Sup Jung ◽  
Yong-Seo Park
Keyword(s):  
Optimal Control ◽  
Energy Consumption ◽  
Control Method ◽  
Thermal Environment ◽  
Hvac Systems ◽  
Control Algorithms ◽  
Total Energy Consumption ◽  
Indoor Thermal Environment ◽  
Optimal Control Method ◽  
Temperature And Humidity

This study examined a method to reduce energy consumption in office buildings. Correspondingly, an optimal control method was proposed for heating, ventilation, and air conditioning (HVAC) systems via two control algorithms that considered the indoor thermal environment. The control algorithms were developed by considering temperature and humidity as the factors of the indoor thermal environment that influence the control of HVAC systems and the predicted mean vote comfort ranges. Furthermore, an experiment was performed using office equipment that incorporated the two control algorithms for HVAC systems, and the correlation between changes in the thermal environment within the office and the occupant’s comfort levels was estimated via an actual survey. The results demonstrated that the proposed control method for HVAC systems, which considered the comfort ranges of temperature and humidity and the thermal adaptation capability, can efficiently maintain the occupant’s comfort with lower energy usage compared with conventional HVAC systems. Thus, the use of the control method contributes to the reduction of total energy consumption in buildings with HVAC systems.

The Multi-Point Temperature Decoupling Control Method and its Realization

2013 ◽  
Vol 321-324 ◽  
pp. 2237-2240
Author(s):  
Jing Chen ◽  
Wei Yang ◽  
Aij Un Luo ◽  
Xue Wu
Keyword(s):  
High Performance ◽  
Control Method ◽  
Decoupling Control ◽  
Pure Oxygen ◽  
Price Ratio ◽  
Point Temperature ◽  
Pid Algorithm ◽  
Control Precision ◽  
Nonlinear Features ◽  
High Control

There is a strong coupling among the multi-point temperatures of rich- or pure-oxygen combustion ceramic roller kiln. The temperature of ceramic kiln is characterized by large inertia, pure time-delay and nonlinear features. The simple and practical decoupling control method in this kiln is proposed, and the multi-point temperature decoupling controller based on DSP is developed. The traditional PID algorithm is improved. Experimental results show that the decoupling controller of multi-point temperature has high control precision, reliability, and high performance-price ratio. It can meet the control requirements of this kiln.

Unmanned aircraft automatic flight control algorithm in a spin maneuver

2020 ◽  
Vol 92 (8) ◽  
pp. 1215-1224
Author(s):  
Tomasz Rogalski ◽  
Paweł Rzucidło ◽  
Jacek Prusik
Keyword(s):  
Automatic Control ◽  
Flight Control ◽  
Unmanned Aircraft ◽  
Control Algorithms ◽  
Content Type ◽  
Aircraft Flight ◽  
Control Precision ◽  
In Series ◽  
Flight Parameters ◽  
High Control

Purpose The paper aims to present an idea of automatic control algorithms dedicated to both small manned and unmanned aircraft, capable to perform spin maneuver automatically. This is a case of maneuver far away from so-called standard flight. The character of this maneuver and the range of aircraft flight parameters changes restrict application of standard control algorithms. Possibility of acquisition full information about aircraft flight parameters is limited as well in such cases. This paper analyses an alternative solution that can be applied in some specific cases. Design/methodology/approach The paper uses theoretical discussion and breakdowns to create basics for development of structures of control algorithms. Simplified analytical approach was applied to tune regulators. Results of research were verified in series of software-in-the loop, computer simulations. Findings The structure of the control system enabling aerobatic flight (spin flight as example selected) was found and the method how to tune regulators was presented as well. Practical implications It could be a fundament for autopilots working in non-conventional flight states and aircraft automatic recovery systems. Originality/value The paper presents author’s original approach to aircraft automatic control when high control precision is not the priority, and not all flight parameters can be precisely measured.

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.

scholarly journals Modelling of Ventilation Rate and Heating Rate using Multi-Module Fuzzy Control System for A Greenhouse

2020 ◽  
Vol 5 (7) ◽  
pp. 800-806
Author(s):  
Jamilu Yau ◽  
Ji JianWei ◽  
Hui Wang ◽  
Olubakinde Eniola ◽  
Folahan Peter Ibitoye
Keyword(s):  
Fuzzy Control ◽  
Heating Rate ◽  
Control Method ◽  
Ventilation Rate ◽  
Fuzzy Logic Controllers ◽  
Heating Rates ◽  
Temperature And Humidity ◽  
Save Energy ◽  
Ventilation Rates ◽  
Reduced Temperature

The implementation of Ventilation rate and Heating rate can save energy and reduce cost of production. In previous studies, ventilation rates and heating rates were calculated based on mass and energy balance but they are mainly influenced by several factors. In order to check for the effectiveness and applicability of greenhouse ventilation rate and heating rate, we study a multi-module fuzzy control method and use fuzzy logic controllers to control the coordination of a greenhouse heating and ventilation systems. The complexity is reduced by using fuzzy tool in matlab-simulink environment which enables a quick design. The experimental data showed that the new multi-module fuzzy control reduced temperature and humidity fluctuations and maintained temperature and humidity closer to the desired temperature and humidity; this method can be easily used to control other equipment in the greenhouse.

Research and Implementation of Control Method for Time Grating Rotary Table with High Precision

2013 ◽  
Vol 660 ◽  
pp. 135-138
Author(s):  
Zhong Hua Gao
Keyword(s):  
Control Method ◽  
Angular Displacement ◽  
Numerical Control ◽  
Rotary Table ◽  
Loop Control ◽  
Nc System ◽  
Angle Measuring ◽  
High Control ◽  
Control Accuracy ◽  
Measuring Unit

A new numerical control (NC) rotary table with high accuracy is presented. Time grating, which was taken as the angle measuring unit, was installed inside the rotary table to measure the angular displacement in real time. Moreover, the signal of time grating was used as the feedback to realize full-closed loop control for improving the control accuracy of the NC table. Furthermore, the problem of insufficient subdivision of the step angle of the stepping motor could be solved by increasing the transmission ratio of motor shaft and rotary table. Experiments prove that the NC rotary table has the advantages of high control accuracy and running steadily, and the NC system shows a good application prospect in the field of machining.

Predictive Control of the VAV System Based on Recurrent Wavelet Neural Network

2011 ◽  
Vol 467-469 ◽  
pp. 928-933
Author(s):  
Jie Jia Li ◽  
Ben Wang ◽  
Xiao Yan Guo ◽  
Lu Lu Sun
Keyword(s):  
Neural Network ◽  
Predictive Control ◽  
Bp Neural Network ◽  
Control Method ◽  
Time Lapse ◽  
Wavelet Neural Network ◽  
Control Precision ◽  
Air Volume ◽  
Air Supply ◽  
High Control

An air supply control method of VAV system based on BP neural network is proposed in this paper, which combines with the recurrent wavelet neural network model, predictive control and optimization of parameters. With the proposed method, the air volume of the VAV system can be controlled accurately even if the change of the air is nonlinear and time-lapse. Compared with tradition control method, it has the advantages of rapidly converging, high control precision, strong skills of learning and wide application prospect.

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