Papers by Keyword: Automatic Control

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Authors: Dong Sheng Wang, Xing Peng Zhou, Xiao Ming Mo, Yi Wang
Abstract: During drinking water treatment, the chemical dosing processes, such as coagulant dosing process, ozone dosing process and chlorine dosing process are usually manually operated based on the operator knowledge and experience. However, due to the variations of water quality, water flow and process operational conditions and characteristics of large time-delay and nonlinear for the chemical dosing processes, it is difficult to adjust the chemical dosages in time by operators to keep the treated water quality stable, especially during the periods of rapid and frequent variations of water quality, water flow and process operational conditions. Thus, the improvements of control methods for the chemical dosing processes are essential to the operation of drinking water treatment plants. The Xiangcheng Water Treatment Plant in Suzhou, China has been utilizing the automatic control for chemical dosing processes since February 2012. Automatic controllers are designed respectively for the coagulant dosing process, ozone dosing process and chlorine dosing process. After the implementation of automatic control, operators are not necessary to keep constant attention. In addition, due to the improvements of control accuracies for the chemical dosing processes, the chemical dosages are reduced on the premise of ensuring safe water. Thus, both of the human resource costs and material costs can be saved. The practical control results demonstrate the efficiencies of proposed methods.
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Authors: Ke Zhang, Han Pin Luo
Abstract: Computer stereo vision has been paid high attention in areas such as industry measurement and automatic control. Calibration of stereo vision system is a key step to implement vision measurement. Nonlinear calibration method involves too many parameters and too complex function, so the processing of optimization is difficult and slow. In this paper, two digital cameras are used to set up stereo vision system which provides convenient experimental operation. The binocular stereo vision system is calibrated using linear calibration model. The results indicate that the method is stable and fast with high precision and practicability.
372
Authors: Chun Guo Fei, Jin Long Zhang, Tian Hao Liu, Hai Zhong Xu
Abstract: Aircraft fire training simulators are key facilities in airport used for firefighters to do firefighting trainings. In order to protect the safety of firefighters, the monitoring system should be applied to monitor the internal environment of the simulator. In accordance with the requirements of the training environment, a kind of monitoring system based on MCU and GPRS communication components are built. The parameterized PID controller, the sensor detection module, the fan and spray drive module are consisted of closed-loop to achieve real-time control and regulation on the smoke and temperature of the internal simulator. Using GPRS module, the internal scenes of the simulator are sent to the command center through the information transmission system. Based on the information transported from training site, command center can take the appropriate training programs to guide firefighters. Use this system, the training safety is ensured and the training efficiency is improved at the same time.
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Authors: Xiao Zhuang Gao, Peng Zhang, Wei Wang
Abstract: The article mainly introduces the design and application of a small power brushless DC motor drive control system circuit, describes the special control function of the gate circuit chip, gives a typical application circuit, and explains.
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Authors: Tao Qi, Bo Wang
Abstract: In view of the current status of manual adjustment-dominated heating network adjustment, time-consuming information feedback and network balance, failure of network balance to achieve the best condition, and uneven heat and cold in a district, heat supply automation transformation technology program in this district is proposed to improve the efficiency of heating network and achieve the goal of energy conservation and emission reduction.
1098
Authors: Fa Xing Wang, Ying Zheng
Abstract: This article introduces the alternative principle of progressive characteristic of unbounded Jacobi matrix into the process of automatic control of circuit which makes the feedback signal of control circuit has two different delay characteristics using unbounded Jacobi matrix. It also adds the weight of transconductance unit. The voltage signal can output smoothly which reduces the oscillation of the circuit and improves the accuracy of the circuits automatic control. This paper studies the control role of unbounded Jacobi matrix on the circuit using experimental method and gets the I / V curve. From the curve, we can concludes that the I / V of the circuit is not constant. The boundaries of linear region and the saturation region correspond with unbounded Jacobi matrix theory. Linear and saturation regions have no obviously transition boundary which applies unbounded Jacobi matrix to the automatic process of circuits successfully.
846
Authors: Jing Liu, Yun Wei Zhang
Abstract: An automatic aeroponics growth system is developed in this paper on the base of ultrasonic atomization which has more advantages to product nutrient mist compared with other traditional atomizing type. The system is mainly consist of two parts including the aeroponics culture mechanism and automatic control device. The structure of the growth system and its working principle are introduced in detail, and its components, software and hardware designing are given in the paper. In order to improve atomization efficiency of nutrient solution for uniform nutriment absorption at the root system, the ultrasonic atomizer, which can atomize the nutrient solution to the ultrafine particles of 1-5 microns diameter, is employed as the key component of system. Considering the effects of temperature and humidity on plant root growth, a digital temperature-humidity sensor is used to detect the environmental signal of the plant root system . The temperature and humidity information can be transmitted to MCU which automatically controls the actuators to adjust the temperature and humidity of nutrient mist in a expected range. The system with features of simple structure and convenient control can supply a experimental platform which is not only comfortable for aeroponics culture, but also convenient for morphologic observation of plant roots.
161
Authors: Jing Liu, Yun Wei Zhang
Abstract: According to the biological characteristics of bamboo seedling, an automatic aeroponics growth system is developed for bamboo seedling and root observation, which can prepare good condition of water-fertilizer, air and warm during bamboo seedling. The ultrasonic atomizer is used to atomize the nutrient solution to the ultrafine particles of 1-5 microns diameter. Compared with traditional piezometrical atomization, this method can not only improve atomization efficiency of nutrient solution to promote uniform absorption at the roots, but also avoid the phenomenon of root-washing. In addition, considering the significant effect of temperature and humidity on bamboo root growth, a temperature-humidity control system is designed for automatic control of water-fertilizer and temperature in bamboo root growth environment. The system supplies an experimental platform with features of simple structure and convenient control. In the procedure of bamboo seedling, bamboo rhizome and shoot can grow fast because of enough moisture nutrition, good breathing, and low growth resistance. Furthermore, it is also convenient for morphologic observation of bamboo roots.
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Authors: Shang Bin Zhang, Si Liang Lu, Hai Bin Zhang, Yu Xiang Liao, Fan Rang Kong
Abstract: This paper depicts the design of an automatic golf recycling robot. The purpose of this paper is to present the key technologies and results on the automatic golf recycling robot. The designed robot is an intelligent system that is consisted of three key modules: the hardware module includes the mechanical structure which can adapt to the golf course; the control module processes the signals from the multiple sensors and instructions to navigate the robot; the decision module can plan the path via recognition of the golf balls from the background grass. Besides, to avoid an emergency situation occurrence, the robot is equipped with a remote wireless control system. The designed robot has been tested on the driving range, and the basic functions of the robot have been implemented. The golf recycling robot supersedes the human labor significantly and shows a wide potential applications.
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Authors: Qing Yuan Zhu, Cheng Lu Wen, Wen Yi Xie, Xiao Hui Du
Abstract: This paper developed an automatic control system for folding arm awning based on environmental factors, which can overcome the disadvantages of the traditional awning of unitary control mode and low level of intelligence. The system consists of sensor unit, controller, drive motor and transmission mechanism. The sensor unit is used for testing light intensity, wind speed and rain, then an AT89S52 SCM single-chip microcomputer which is the core of the controller is applied to receive testing signal and send instructions to AC motor to realize the extending and withdrawing state of the awning according to the corresponding control logic. Meanwhile, this system is able to switch from automatic control to manual control so as to deal with power outage and other special situation and maintain operation of awning. The results of the prototype test show that this system is running steadily and can adjust the working condition of the awning in time according to the environment change. Compared with the current electric awning, the intelligent folding arm awning controlled according to environmental factors can achieve more energy conservation and environmental protection.
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