scholarly journals Cooperative synchronization control of intelligent lifting systems with actuator failures

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881349
Author(s):  
Lijing Dong
Keyword(s):  
Data Transfer ◽  
Synchronization Error ◽  
Synchronization Control ◽  
Wireless Data ◽  
Hydraulic Actuators ◽  
Actuator Failures ◽  
Distributed Controller ◽  
Transfer Unit ◽  
Distributed Synchronization ◽  
Lifting System

Synchronization of a large-scale lifting system with hydraulic actuator failures is investigated in this article. The lifting system is composed of multiple intelligent lifting subsystems with hydraulic actuators, wireless data transfer unit, and distributed controller. During the lifting process, the hydraulic actuators are possible to be malfunctioned. Once actuator failure occurs, the number of lifting points and the communication topology would change over different time intervals. This article proposes a distributed synchronization control method and adopts switching technique in analyzing the lifting synchronization. The distributed controller is designed with information received from around subsystems through wireless data transfer unit rather than with direct reference signal from the control station. On the basis of Lyapunov stability theory and switched technique, sufficient conditions that guarantee the synchronization of the lifting system with actuator failures are achieved, and synchronization errors can be reduced as small as desired. Finally, the effectiveness of proposed distributed synchronization controller is verified by numerical simulations conducted on AMESim platform. From the simulation results, it can be seen that when actuator failures occur, the synchronization error of the remaining lifting subsystems is less than 5%. The lifting synchronization error shrinks to 5% in 5.87 s when a broke-down subsystem returns to normal.

Strategic Analysis and Experimental Research on Synchronization Control of Dual-Motor in Crane

2014 ◽  
Vol 644-650 ◽  
pp. 836-839
Author(s):  
Yong Qiu Liu ◽  
Xiao Feng Liu ◽  
Hai Xia Wang
Keyword(s):  
Control Strategy ◽  
Error Control ◽  
Reference Value ◽  
Synchronization Error ◽  
Synchronization Control ◽  
Strategic Analysis ◽  
Work Safety ◽  
Control Precision ◽  
Lifting System ◽  
Control Accuracy

In order to ensure work safety, large cranes generally use two motors together to upgrade the load, so often there is a synchronization error, control accuracy is affected. To address this issue, the paper crane hydraulic lifting system to study proposed control strategy based on fuzzy PID's. The results show that the method used to effectively reduce the synchronization error between the two motors to improve the control precision crane, a certain reference value.

scholarly journals Extracting the Resistive Current Component from a Surge Arrester’s Leakage Current without Voltage Reference

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1257
Author(s):  
Vid Vončina ◽  
Jože Pihler ◽  
Miro Milanovič
Keyword(s):  
Leakage Current ◽  
Data Transfer ◽  
Electronic Device ◽  
Theoretical Background ◽  
Voltage Reference ◽  
Current Component ◽  
Surge Arresters ◽  
Transfer Unit ◽  
Control Centre ◽  
Resistive Component

This article presents the development of the theoretical background and the design of an electronic device for monitoring the condition of a gapless Metal Oxide Surge Arrester (MOSA). The device is intended to be used online. Because of the inaccessibility and possible remote location of most surge arresters, it is equipped with a communication system, allowing for the device to convey the measurement of the surge arrester characteristics under any conditions. It is possible to determine the condition of the MOSA by gathering measurements of the surge arrester’s resistive component of leakage current. The leakage current information is sent via data transfer unit to a server and, after interpretation, will be forwarded to the authorised personnel through the surge arrester control centre.

Wireless Data Transfer in under Water System

2017 ◽  
Author(s):  
S. Sangeetha ◽  
Santhi Priya ◽  
K. S. Saranya ◽  
S. Saranya ◽  
T. Jayasimha
Keyword(s):  
Data Transfer ◽  
Water System ◽  
Wireless Data

scholarly journals Time Domain Spectroscopy/Imaging and Wireless Data Transfer Technologies with Terahertz Wave

2010 ◽  
Vol 19 (3) ◽  
pp. 12
Author(s):  
Mun Cheol PAEK ◽  
Min Hwan KWAK ◽  
Sungil KIM ◽  
Seung Beom KANG ◽  
Hancheol RYU ◽  
...  
Keyword(s):  
Time Domain ◽  
Data Transfer ◽  
Terahertz Wave ◽  
Wireless Data ◽  
Time Domain Spectroscopy

Discrete Portable Measuring Device for Monitoring Noninvasive Intraocular Pressure with a Nano-Structured Sensing Contact Lens Prototype

2012 ◽  
pp. 214-229
Author(s):  
Ana Moya ◽  
Anton Guimerà ◽  
Irene Sánchez ◽  
Vladimir Laukin ◽  
Raúl Martín ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Contact Lens ◽  
Data Transfer ◽  
Measurement Instrument ◽  
Measuring System ◽  
Wireless Data ◽  
Film Sensor ◽  
Measuring Device ◽  
Electronic Measurement ◽  
Contact Lens Sensor

A new portable measuring device for monitoring intraocular pressure with a non invasive system using a prototype of contact lens has been developed. The contact lens is based on a new organic flexible highly piezo-resisitive film sensor that is glued to the central hole of a lens. The measuring system is wire connected to the contact lens and incorporates user interface methods and a Bluetooth link for bi-directional wireless data transfer. The key design aspects of such architecture are discussed in this paper. The system is designed with an architecture that can be integrated in the future in order to be placed in the contact lens. The discrete system is used to validate the electronic measurement operation and the contact lens sensor (CLS). The measurement instrument can calibrate the differences of the nominal value of the sensor and measure resistances variations that are related to pressure variations. The measuring system and the contact lens sensor were tested with an eye phantom and with enucleated pig eyes by applying pressure changes between 7 to 32 mmHg recording the electrical changes with the portable device.

scholarly journals Active Disturbance Rejection Position Synchronous Control of Dual-Hydraulic Actuators with Unknown Dead-Zones

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6124
Author(s):  
Lixin Wang ◽  
Dingxuan Zhao ◽  
Fucai Liu ◽  
Qian Liu ◽  
Zhuxin Zhang
Keyword(s):  
Disturbance Rejection ◽  
Position Control ◽  
Dead Zone ◽  
Lyapunov Theory ◽  
Least Square ◽  
Synchronization Control ◽  
Hydraulic Actuator ◽  
Dead Zones ◽  
Hydraulic Actuators ◽  
Active Disturbance Rejection

In this paper, an integrated control strategy of position synchronization control for dual-electro-hydraulic actuators with unknown dead-zones is proposed. The unified control scheme consists of two parts: One is adaptive dead-zone inverse controllers of each hydraulic actuator to offset the unknown dead-zones. The other is the linear active disturbance rejection controller (LADRC) for position synchronization error. First, the model of the electro-hydraulic proportional position control system (EPPS) was identified by the forgetting factor recursive least square (FFRLS) algorithm. Next, the model reference dead-zone inverse adaptive controller (MRDIAC) was developed to compensate for the delay of actuator response caused by unknown proportional valve dead-zones. Meanwhile, the validity of the adaptive law was proven by the Lyapunov theory. Therefore, the position control accuracy of each hydraulic actuator is guaranteed. Besides, to improve the precision of position synchronization control of dual-hydraulic actuators, a simple and elegant synchronous error-based LADRC was adopted, which applies the total disturbances design concept to eliminate and compensate for motion coupling rather than cross-coupling technology. The performance of the proposed control solution was investigated through extensive comparative experiments based on a hydraulic test platform. The experimental results successfully demonstrate the effectiveness and practicality of the proposed method.

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