Development of New Polymer Dosage Control Method for Sludge Dewatering Process

1993 ◽  
Vol 28 (11-12) ◽  
pp. 263-272 ◽  
Author(s):  
Chiaki Igarashi ◽  
Kazunari Tanaka ◽  
Teruaki Kitamura ◽  
Kazuo Fujita ◽  
Kazuaki Arai ◽  
...  
Keyword(s):  
Control Method ◽  
Sludge Dewatering ◽  
Proportional Control ◽  
Sludge Characteristics ◽  
Streaming Current

In a sludge dewatering process using polymer, controlling the polymer dosage is an important factor for upgrading performance and achieving a saving on costs. A new automatic polymer dosage control method has been developed by the authors, which features the use of a streaming current detector or a colloid titrator. These detectors detect the colloidal charge of the filtrate from sludge. The said method was used with actual dehydrators and the following advantages were confirmed.(1) The said method is applicable for various types of dehydrators.(2) The said method is effective even when there are changes in sludge characteristics.(3) The said method is more economical than a conventional solids proportional control method in that less polymer is used.

Influence of Casting Speed on Solidification Process and Solidification Structure of Continuously Cast Bloom

2011 ◽  
Vol 402 ◽  
pp. 123-131 ◽  
Author(s):  
Zi Bing Hou ◽  
Guo Guang Cheng
Keyword(s):  
Surface Temperature ◽  
Casting Speed ◽  
Control Method ◽  
Target Surface ◽  
Solidification Process ◽  
Solidification Structure ◽  
Transfer Model ◽  
Proportional Control ◽  
Temperature Method ◽  
Continuously Cast

On the basis of problems about quality of steel products that a certain special steel factory facing, a heat transfer model about continuous casting process was first established, then the influence of casting speed on solidification process and solidification structure of continuously cast bloom was comprehensively studied. It is shown that shell thickness leaving mold, crater length and the value of H(which is chosen as the measurement criterion of the number of the heterogeneous nucleation nucleus) are influenced most with increasing casting speed. Meantime, compared with proportional control method, solidification process of continuously cast bloom is in uniform variation with small fluctuation by target surface temperature method. What’s more, when centre solidification time is considered only, central zone macrosegregation may form more easily at last by proportional control method with increasing casting speed, but it is opposite by target surface temperature method; when the value of G/V1/2 and the value of H are considered only, the ratio of equiaxed grain will increase with increasing casting speed by proportional control method, but it is opposite by target surface temperature method.

The Research on Intelligent Control Method for EHP System

2012 ◽  
Vol 580 ◽  
pp. 12-15 ◽  
Author(s):  
Yi Wan ◽  
Qi Bo Cai ◽  
Huan Wang
Keyword(s):  
Control System ◽  
Predictive Control ◽  
Intelligent Control ◽  
Internal Model ◽  
High Speed ◽  
Control Method ◽  
Internal Model Control ◽  
Support Vector ◽  
Proportional Control ◽  
Self Adaptive

Optimized machine learning algorithm is applied to control modeling of high-speed electric-hydraulic proportional system of high nonlinear in this paper, a identification model of high-speed electric-hydraulic proportional system is built based on support vector machines, fusion intelligent method of dynamic self-adaptive internal model control and predictive control is realized for high-speed electric-hydraulic proportional control system. Internal model and inverse controller model are online adjusted together. Simulation shows the satisfactory tracking effect by intelligent technology of dynamic self-adaptive internal control and predictive control based on the support vector machine, the dynamic characteristic is greatly improved by the intelligent control strategy for high-speed electric-hydraulic proportional control system, good tracking and control effect is reached in condition of high frequency response. It provides a new intelligent control method for high-speed electric-hydraulic proportional system.

Sheet Thickness Optimization for Superplastic Forming of Engineering Structures

1999 ◽  
Vol 122 (1) ◽  
pp. 117-123 ◽  
Author(s):  
A. Huang ◽  
M. J. Cardew-Hall ◽  
A. Lowe
Keyword(s):  
Convergence Rates ◽  
Control Method ◽  
Three Dimensional ◽  
Sheet Thickness ◽  
Superplastic Forming ◽  
Optimization Methods ◽  
Gradient Search ◽  
Engineering Structures ◽  
Proportional Control ◽  
Control Approach

This paper explores two optimization strategies; the gradient search and proportional control methods, for determining the initial sheet thickness of superplastic forming to ensure final desired part thickness. A hemispherical dome model was involved in the testing of both optimization methods. Also, a three-dimensional rectangular box model was optimized by the proportional control method. The gradient search technique is shown to be acceptable in terms of the optimized thickness obtained, but displays poor convergence rates. The proportional control approach presented is easy to be implemented, and yields not only more accurate sheet thickness, but much higher convergence speeds that makes such optimization possible on complex geometric models. [S1087-1357(00)01001-7]

scholarly journals Study on self-adaptive proportional control method for a class of output models

2009 ◽  
Vol 11 (2) ◽  
pp. 459-477 ◽  
Author(s):  
Zhao-Han Sheng ◽  
◽  
Tingwen Huang ◽  
Jian-Guo Du ◽  
Qiang Mei ◽  
...  
Keyword(s):  
Control Method ◽  
Proportional Control ◽  
Self Adaptive

scholarly journals Implementasi Pengendalian Robot Mobil Pencari Target Dan Penghindar Rintangan

2021 ◽  
Vol 11 (2) ◽  
pp. 36-42
Author(s):  
Khairil Khairil ◽  
Toibah Umi Kalsum
Keyword(s):  
High Risk ◽  
Control Method ◽  
Block Diagram ◽  
Pi Control ◽  
Dirty Work ◽  
Black Line ◽  
Push Button ◽  
Proportional Control ◽  
Wheeled Robots ◽  
Sophisticated Technology

Robots are useful to help humans in performing jobs that require high precision, substantial labor, repetitive and dirty work, and high-risk or dangerous jobs. Those are the high-risk human jobs that a robot can do. Wheeled robots have the ability to go to the targeted position. Proportional control is used to control the movement of robots. In addition, the robot will also be equipped with PI control method to adjust the actual wheel speed of the robot. The block diagram of the obstacle-driven avoider robot consists of push button, rotary encoder, ultrasonic sensor, Atmega, IC L298D, DC Motor and Light. The results of the obstacle-driven avoider robot, wheeled robots have the ability to run in accordance with the desired black line. Proportional control is used to control the movement of robots. In addition, the robot will also be equipped with ultrasonic sensors to set the robot in avoiding obstacles. Based on the results of testing and analysis that have done, it is suggested that there is tool that can be provided to develop a more sophisticated technology like adding sensors or more features.

Dual Piezoelectric-Driving Pneumatic Digital Valve Control Method Simulation Research

2013 ◽  
Vol 816-817 ◽  
pp. 367-370
Author(s):  
You Xiong Xu ◽  
Song Qing Zhu
Keyword(s):  
Control Algorithm ◽  
Control Method ◽  
Simulation Research ◽  
Proportional Control ◽  
Waste Gas ◽  
Joint Simulation ◽  
Compound Control ◽  
Simulation Results ◽  
Valve Control ◽  
Pressure Overshoot

Because its pilot stage is a two-position tree-way valve, the previously research piezoelectric type pneumatic digital valve also constantly works in on or off state even in the case of output stable pressure, which makes the valve with pressure fluctuation, waste gas and other shortcomings. In order to overcome the above problem, a novel pneumatic digital valve driven by dual piezoelectric is presented in this thesis. And its simulation model is built based on the AMESim and Matlab/simulink joint simulation platform. On this basis, its control method is researched by the simulation. The simulation shows that the Bang-Bang and the PWM control algorithm can basically achieve the digital proportional control of the valve, but the valve has overshoot. For this, the compound control algorithm with PID plus PWM is proposed to control the valve. The simulation results show that this algorithm is effective which can reduce the pressure overshoot.

scholarly journals Unmanned surface vessel heading control of model-free adaptive method with variable integral separated and proportion control

2019 ◽  
Vol 16 (3) ◽  
pp. 172988141983158
Author(s):  
Quanquan Jiang ◽  
Yulei Liao ◽  
Ye Li ◽  
Yugang Miao ◽  
Wen Jiang ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Separation Factor ◽  
Control Method ◽  
Compact Form ◽  
Proportional Control ◽  
Model Free ◽  
Heading Control ◽  
Unmanned Surface Vessel ◽  
Integral Separation ◽  
Surface Vessel

Based on model-free adaptive control theory, the heading control problem of unmanned surface vessels under uncertain influence is explored. Firstly, the problems of compact form dynamic linearization model-free adaptive control method applied to unmanned surface vessel heading control are analyzed. Secondly, by introducing proportional control and variable integral separation factor, an variable integral separation model-free adaptive control algorithm with proportional control is proposed. The introduction of proportional control and variable integral separation factor solves the problems of oscillation, instability, and integral saturation when rudder angle is controlled directly to control the heading of unmanned surface vessel with compact form dynamic linearization model-free adaptive control method. Finally, the effectiveness of the method is verified by the simulation and field experiments results of heading control with model perturbation and system time delay in unmanned surface vessel heading subsystem.

Improved sludge dewaterability using persulfate activated by humic acid supported nanoscale zero-valent iron: effect on sludge characteristics and reaction mechanisms

2018 ◽  
Vol 4 (10) ◽  
pp. 1480-1488 ◽  
Author(s):  
Hao Li ◽  
Lei Song ◽  
Baohong Han ◽  
Hongwei Song
Keyword(s):  
Humic Acid ◽  
Synergistic Effect ◽  
Reaction Mechanisms ◽  
Zero Valent Iron ◽  
Sludge Dewatering ◽  
Sludge Characteristics ◽  
Nanoscale Zero Valent Iron ◽  
Sludge Dewaterability

Sludge dewatering was efficiently enhanced by nZVI/HA-PS conditioning, and nZVI/HA-PS exhibited the synergistic effect of advanced oxidization and skeleton building.

An Object Transportation System Using Controlled Daphnia Magna

2012 ◽  
Author(s):  
Akitoshi Itoh ◽  
Masahiro Kawamata ◽  
Tomohiro Hirai
Keyword(s):  
Daphnia Magna ◽  
Control Method ◽  
Transportation System ◽  
Target Object ◽  
White Ball ◽  
Proportional Control ◽  
Black Film ◽  
Position Detection ◽  
Control Scheme ◽  
Object Transportation

In this study, we tried to create an object transportation system using Daphnia magna. We developed a target object for the transportation experiment using a 5-mm-diameter transparent acrylic rod with a hole in the lower part. Black film and a small white ball were attached to the top surface of the object in order to improve contrast and allow easier position detection during image processing. The daphnia were first directed to the guide point, about 10 mm opposite the desired transportation direction. They were then guided to collide with the object. If a collision did not occur, they were guided to an evasion point 5 mm to the side of the object, then back to the guidance point and directed to collide with the object once again. When the daphnia is making contact with the object, the guidance direction was compensated to the outside of the target course to transport along the target course. A compensation angle was calculated by the proportional control method. By using this control scheme, daphnia could transport an object through the seven apices (about 1.5 laps) of the star-shaped target routes.

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