scholarly journals Linear Drive Based on Silicon/Ethanol Composite

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2668
Author(s):  
Tomasz Kapłon ◽  
Andrzej Milecki
Keyword(s):  
Physical State ◽  
Closed Loop ◽  
Feedback Signal ◽  
Automation System ◽  
Closed Loop Control ◽  
Positioning Error ◽  
Test Results ◽  
Loop Control ◽  
Closed Loops ◽  
Starting Position

The paper presents a concept of an actuator, based on a silicon/ethanol composite placed in the brass bellows. Such actuator is operating based on a change in the physical state of ethanol, which is enclosed in bubbles surrounded by a matrix of silicone rubber. In this paper, the prototype of the actuator is described, and a series of its test results, in the open and closed loops, are presented. Two laser distance-sensors, with different accuracies, were used as a source of the feedback signal. During the investigations the temperature of the actuator was also measured. This has allowed us to determine the delay in heat flow from the heater to the composite. In the closed loop, P- and PI-type controllers were used in the drive positioning experiments. It was discovered that in the closed loop control, it was possible to achieve a positioning error of less than 200 µm. During the tests, the temperature inside the drive and the ambient temperature were also measured. In order to improve the dynamics of the drive, a small fan was used, controlled by the automation system. It allowed us to shorten the time to return the drive to its starting position. The results of frequency tests of the drive have also been presented.

Automatic Positioning Closed-Loop Control Cystem Design of Linear Time Grating Sensor

2011 ◽  
Vol 328-330 ◽  
pp. 2121-2124
Author(s):  
Tian Heng Zhang ◽  
Dong Lin Peng ◽  
Ji Sen Yang ◽  
Xian Quan Wang ◽  
Chun Dong
Keyword(s):  
Control System ◽  
High Precision ◽  
Closed Loop ◽  
Linear Time ◽  
Stepper Motor ◽  
Feedback Signal ◽  
Closed Loop Control ◽  
Positioning System ◽  
Loop Control ◽  
Automatic Positioning

A high-precise automatic positioning system for data sample of linear time grating sensor is designed. In order to achieve linear time grating sensor of data sample, improve measure work efficiency, an ARM MCU is used as a major chip to control the stepper motor to rotate. In this way, the stepper motor drives the ball screw, the moving probe of linear time grating sensor and reading head of linear grating to move synchronously. A high-precision automatic positioning of the system hardware is designed. In addition, ARM controlling circuits and stepper motor driving circuits are designed. Therefore, the special communication interface is designed for the high-precision automatic positioning system, receiving the feedback signal from time grating sensor, forming a high-precision closed loop control system, and communicating with upper computer by serial. Experiment results prove that the positioning precision of control system can reach 0.1 um.

Study on the Effect of Fuzzy PID Air-Fuel Ratio Closed Loop Control of a Natural Gas Engine

2014 ◽  
Vol 577 ◽  
pp. 372-377 ◽  
Author(s):  
Yue Li ◽  
En Zhe Song ◽  
Zhan Hu Zhang ◽  
Guo Feng Zhao ◽  
Shuai Huang
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Closed Loop ◽  
Feedback Signal ◽  
Closed Loop Control ◽  
Loop Control ◽  
Gas Engine ◽  
Fuel Ratio ◽  
Cng Engine ◽  
Self Tuning

The air-fuel ratio (AFR) control becomes an important research direction in gas engine. This article conducts air-fuel ratio (AFR) closed loop control research in a CNG engine. The injection pulse width of gas is controlled by a controller, oxygen sensor signal as a feedback signal. In order to make the engine can achieve the anticipated air-fuel ratio under different conditions; we adopt fuzzy self-tuning PID control strategy based on feed forward control. We transformed a 2135G diesel engine into the single fuel gas engine. Experimental investigation on the effect of air-fuel ratio closed loop control .Experimental results shows that, fuzzy self-tuning PID control strategy can control CNG engine air-fuel ratio working in the good condition.

Design of High Precision Control for Flat Panel System Based on Free Pendulum

2014 ◽  
Vol 687-691 ◽  
pp. 285-289
Author(s):  
He Zhao ◽  
Tao Hou
Keyword(s):  
Closed Loop ◽  
Rotation Angle ◽  
Closed Loop Control ◽  
Test Results ◽  
Flat Panel ◽  
Detection Function ◽  
Angle Sensor ◽  
Loop Control ◽  
Precise Control ◽  
Photoelectric Encoder

The method of dual sensors closed-loop control is designed for the flat panel control system base on free pendulum.With this method, the angle of the free pendulum is detected firstly by adopting incremental photoelectric encoder,and then with the free swing angle as the set-point,the real time rotation angle feedback of the flat panel is detected by the angle sensor to form closed-loop control. The test results shows that this method well accomplishes the detection function,and implements high precise control.

Application of an automation system and a supervisory control and data acquisition (SCADA) system for the optimal operation of a membrane adsorption hybrid system

2006 ◽  
Vol 53 (4-5) ◽  
pp. 179-184 ◽  
Author(s):  
P.J. Smith ◽  
S. Vigneswaran ◽  
H.H. Ngo ◽  
H.T. Nguyen ◽  
R. Ben-Aim
Keyword(s):  
Data Acquisition ◽  
Hybrid System ◽  
Supervisory Control ◽  
Closed Loop ◽  
Optimal Operation ◽  
Automation System ◽  
Closed Loop Control ◽  
Loop Control ◽  
Scada System ◽  
Scada Systems

The application of automation and supervisory control and data acquisition (SCADA) systems to municipal water and wastewater treatment plants is rapidly increasing. However, the application of these systems is less frequent in the research and development phases of emerging treatment technologies used in these industries. This study involved the implementation of automation and a SCADA system to the submerged membrane adsorption hybrid system for use in a semi-pilot scale research project. An incremental approach was used in the development of the automation and SCADA systems, leading to the development of two new control systems. The first system developed involved closed loop control of the backwash initiation, based upon a pressure increase, leading to productivity improvements as the backwash is only activated when required, not at a fixed time. This system resulted in a 40% reduction in the number of backwashes required and also enabled optimised operations under unsteady concentrations of wastewater. The second system developed involved closed loop control of the backwash duration, whereby the backwash was terminated when the pressure reached a steady state. This system resulted in a reduction of the duration of the backwash of up to 25% and enabled optimised operations as the foulant build-up within the reactor increased.

A sheet-bulging machine with closed-loop control

1967 ◽  
Vol 2 (3) ◽  
pp. 246-253 ◽  
Author(s):  
R Bell ◽  
J L Duncan ◽  
I H Wilson
Keyword(s):  
Closed Loop ◽  
Biaxial Tension ◽  
Sheet Material ◽  
True Stress ◽  
Bulge Test ◽  
Feedback Signal ◽  
Closed Loop Control ◽  
Hydraulic Actuator ◽  
Loop Control ◽  
Natural Strain

The design and performance of a machine for testing sheet material in the plastic range is described. The material is stressed in uniform biaxial tension by means of the hydrostatic bulge test. Test variables are measured by electrical transducers and an analogue unit is employed to permit autographic recording of the diagram relating true stress and natural strain. Closed-loop control of the rate of straining is achieved with an electro-hydraulic actuator; the feedback signal is derived from the analogue unit and the test can be controlled on the basis of a computed parameter such as true stress or natural strain.

Closed-Loop Control Vortex-Airfoil Interaction Noise

2006 ◽  
Author(s):  
M. M. Zhang ◽  
L. Cheng ◽  
Y. Zhou
Keyword(s):  
Closed Loop ◽  
Leading Edge ◽  
Fast Response ◽  
Vortical Flow ◽  
Feedback Signal ◽  
Closed Loop Control ◽  
Vortex Interaction ◽  
Control Effect ◽  
Loop Control ◽  
Control Scheme

Closed-loop controlled interactions between an airfoil and impinging vortices were experimentally investigated. This work aims to minimize the fluctuating flow pressure (p) at the leading edge of the airfoil, which is a major source of the blade-vortex interaction noises commonly seen in rotorcrafts. Piezo-ceramic actuators were used to create a local surface perturbation near the leading edge of the airfoil in order to alter the airfoil-vortex interaction. Two closed-loop control schemes were investigated, which deployed p and the streamwise fluctuating flow velocity (u) as the feedback signal, respectively. While the control effect on p was measured using a fast response pressure transducer, the oncoming vortical flow was monitored using a particle image velocimetry and a hot wire. It was found that the control scheme based on the feedback signal u led to a pronounced impairment in the strength of oncoming vortices and meanwhile a maximum reduction in p by 39%, outperforming the control scheme based on the feedback signal p. Physics behind the observations is discussed.

The Impact of Visual Feedback Type on the Mastery of Visuo-Motor Transformations

2012 ◽  
Vol 220 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Sandra Sülzenbrück
Keyword(s):  
Empirical Research ◽  
Visual Feedback ◽  
Closed Loop ◽  
Motor Planning ◽  
Visual Input ◽  
Closed Loop Control ◽  
Loop Control ◽  
Feedback Type ◽  
Effective Use ◽  
The Impact

For the effective use of modern tools, the inherent visuo-motor transformation needs to be mastered. The successful adjustment to and learning of these transformations crucially depends on practice conditions, particularly on the type of visual feedback during practice. Here, a review about empirical research exploring the influence of continuous and terminal visual feedback during practice on the mastery of visuo-motor transformations is provided. Two studies investigating the impact of the type of visual feedback on either direction-dependent visuo-motor gains or the complex visuo-motor transformation of a virtual two-sided lever are presented in more detail. The findings of these studies indicate that the continuous availability of visual feedback supports performance when closed-loop control is possible, but impairs performance when visual input is no longer available. Different approaches to explain these performance differences due to the type of visual feedback during practice are considered. For example, these differences could reflect a process of re-optimization of motor planning in a novel environment or represent effects of the specificity of practice. Furthermore, differences in the allocation of attention during movements with terminal and continuous visual feedback could account for the observed differences.

118-LB: Glucose Variability throughout the Menstrual Cycle on Closed-Loop Control in Type 1 DM

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 118-LB
Author(s):  
CAROL J. LEVY ◽  
GRENYE OMALLEY ◽  
SUE A. BROWN ◽  
DAN RAGHINARU ◽  
YOGISH C. KUDVA ◽  
...  
Keyword(s):  
Menstrual Cycle ◽  
Closed Loop ◽  
Glucose Variability ◽  
Closed Loop Control ◽  
Loop Control ◽  
Type 1 Dm
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