scholarly journals Analysis of a Low-Speed Drive System Using Intelligent Materials

Actuators ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 10
Author(s):  
Toader Vasile Eusebiu ◽  
Milici Laurențiu Dan ◽  
Ungureanu Constantin ◽  
Bejenar Ciprian ◽  
Grosu Oana Vasilica
Keyword(s):  
Control System ◽  
Solar Radiation ◽  
Power Supply ◽  
Rotation Speed ◽  
Drive System ◽  
Agricultural Fields ◽  
Heat Sources ◽  
Intelligent Materials ◽  
Low Speed

This paper presents a low speed drive system with a simple and reliable construction, which can be used in an area where there is no power supply (isolated areas, forests, agricultural fields, etc.) and which operates on the basis of two heat sources, one from solar radiation and one provided by water. Alternatively, this system can be used to recover energy from wastewater from industry. The operation and role of the parameters that can influence the value of the rotation speed of the drive system are analyzed through a simulation, maintaining a constant speed in the case of the prototype is achieved through the control system because in real situations the temperature of heat sources can vary within certain limits. The models and tests performed highlight the parameters of the analyzed drive system and the limits of the range in which its speed can vary.

A PID&AGC Method for Micro Vibration Gyroscope Drive System

2013 ◽  
Vol 562-565 ◽  
pp. 357-362
Author(s):  
Shao Hua Niu ◽  
Dan Dan Hong ◽  
Shi Qiao Gao
Keyword(s):  
Control System ◽  
Vibration Frequency ◽  
Inertial Sensor ◽  
Drive System ◽  
High Q ◽  
Gyro System ◽  
Drive Control ◽  
Working Principle ◽  
Micro Vibration

As a typical inertial sensor, vibration micro-gyro is extensively studied. According to its working principle, drive control system is an important element for the gyro system. The role of drive control system is to keep the drive modal stability including stable vibration frequency and amplitude. The PLL method is usually used to realize the drive system. However, it has some shortcomings used to high Q vibration micro-gyro. In this paper, the problems of the PLL method are analyzed, and a PID & AGC control system is introduced. By simulating and measuring, it is indicated that this method is fit for driving high Q vibration micro-gyro.

Control of Ship Motion at Low Speed: Experiments With a Physical Tanker Model

2008 ◽  
Author(s):  
Leszek Morawski ◽  
Nguyen Cong Vinh
Keyword(s):  
Control System ◽  
Reference Point ◽  
Ship Motion ◽  
Time Duration ◽  
Low Speed ◽  
Control Signals ◽  
Xpc Target ◽  
Fine Control ◽  
Longitudinal Position

The paper presents a system controlling ship motion at low speed. The control system makes use of three fuzzy logic controllers. They are: course keeping controller, longitudinal position keeping controller and transverse position keeping controller. Three controllers work independently to keep the ship hull centre at the reference point with the set course. The ship motion is controlled by tracing and following coordinates of the reference point. They change according to the assumed ship motion trajectory and speed. The ship control system use three propellers: bow thruster, stern thruster and the main propeller of the ship. The control signals (propellers powers) have the form of pulses with relevant amplitude and time duration. The pulsatory nature of the control signals was obtained by proper selection of the shape of the member functions in Mamdani-type controllers and the use of the bisector defuzzyfication method. The magnitude of the signal is changed in steps and plays the role of rough control while its duration is adjusted continuously and plays the role of fine control The control system was worked out in Matlab-Simulink with RTW, xPC-target toolboxes and tested on a scaled physical model of a tanker in the real lake environment. The system installed on model contain two PC computers and as the measured devices use DGPS RTK Leica system, ST20 Anschutz gyrocompass and Gill-windobserver. The paper discuss the controlling algorithm, along with the results of control system tests.

SISTEM AUTOMATIC SWITCH REDUNDANT UPS UNTUK BEBAN ESSENSIAL

2019 ◽  
Vol 5 (1) ◽  
pp. 35-45
Author(s):  
Markus Dwiyanto Tobi ◽  
Alimuddin Mappa
Keyword(s):  
Power Supply ◽  
Working Condition ◽  
Control Circuit ◽  
Energy Sources ◽  
Main Equipment ◽  
Telecommunication Equipment ◽  
Input Condition ◽  
Research Designs ◽  
Switch Circuit

The role of the power supply device is to produce, process and distribute energy sources. Telecommunication equipment can only operate if it has continuous supply. Therefore, to maintain the continuity of the supply, a UPS (Uninterruptable Power Supply) device system is needed so that the supply to the Essential Load device will remain available so that continuity will be maintained. This research designs and proposes how a series of automatic redundant switch systems on UPS to ensure the availability of power supply for the main equipment of telecommunications systems. The Auto switch circuit is designed to have 3 (three) working stages which will trigger the relay driver as control circuit, namely the normal working condition of the contactor input K1 is present, the input condition is zero (lost), and the input condition is present. This system can automatically supply power to telecommunications equipment.

Control System of Power Supply in Under-Ground Coal Mining

2006 ◽  
Vol 2 (3) ◽  
pp. 12-19
Author(s):  
G. G. Pivnyak ◽  
Keyword(s):  
Control System ◽  
Coal Mining ◽  
Power Supply

Temperature Effects on Box Girder for Changsha Medium-low Speed Maglev under Solar Radiation

2017 ◽  
Vol 108 (1) ◽  
pp. 101-105
Author(s):  
Tang Yu ◽  
Dai Gonglian ◽  
Su Miao ◽  
Chen Guorong
Keyword(s):  
Solar Radiation ◽  
Temperature Effects ◽  
Box Girder ◽  
Low Speed

PLANETARY SELF-ORGANIZATION

2020 ◽  
Vol 42 (3) ◽  
pp. 271-282
Author(s):  
OLEG IVANOV
Keyword(s):  
Dynamical System ◽  
Heat Source ◽  
Mantle Convection ◽  
Plate Tectonics ◽  
Rotation Speed ◽  
Self Organization ◽  
Heat Sources ◽  
Kinematic Parameters ◽  
The Earth ◽  
New Type

The general characteristics of planetary systems are described. Well-known heat sources of evolution are considered. A new type of heat source, variations of kinematic parameters in a dynamical system, is proposed. The inconsistency of the perovskite-post-perovskite heat model is proved. Calculations of inertia moments relative to the D boundary on the Earth are given. The 9 times difference allows us to claim that the sliding of the upper layers at the Earth's rotation speed variations emit heat by viscous friction.This heat is the basis of mantle convection and lithospheric plate tectonics.

scholarly journals Solar Radiation and Vitamin D: Mitigating Environmental Factors in Autoimmune Disease

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Gerry K. Schwalfenberg
Keyword(s):  
Rheumatoid Arthritis ◽  
Multiple Sclerosis ◽  
Inflammatory Bowel Disease ◽  
Vitamin D ◽  
Type 1 Diabetes ◽  
Autoimmune Disease ◽  
Solar Radiation ◽  
Inflammatory Bowel

This paper looks at the environmental role of vitamin D and solar radiation as risk reduction factors in autoimmune disease. Five diseases are considered: multiple sclerosis, type 1 diabetes, rheumatoid arthritis, autoimmune disease of the thyroid, and inflammatory bowel disease. Clinical relevant studies and factors that may indicate evidence that autoimmune disease is a vitamin D-sensitive disease are presented. Studies that have resulted in prevention or amelioration of some autoimmune disease are discussed. An example of the utility of supplementing vitamin D in an unusual autoimmune disease, idiopathic thrombocytic purpura, is presented.

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