Radar-based impact load prediction for damage mitigation of infrastructure

2015 ◽  
Vol 23 (12) ◽  
pp. 1908-1924 ◽  
Author(s):  
Jake Edmond Hughes ◽  
Yeesock Kim ◽  
Tahar El-Korchi ◽  
David Cyganski
Keyword(s):  
Control System ◽  
Structural Control ◽  
Impact Load ◽  
Impact Loads ◽  
Control Technology ◽  
Velocity Measurements ◽  
Engineering Structures ◽  
Mr Dampers ◽  
Controller Performance ◽  
Smart Control

The application of smart control technology to both aging and new infrastructure is essential to extending service life, increasing life safety, and decreasing repair and replacement costs. One area of control technology research for civil engineering structures that has received little attention historically is that of high-impact loads, such as collision events. The dissipation of impact energy using smart control devices, such as magnetorheological (MR) dampers, leads to less plastic deformation and damage, and a lower likelihood of collapse in civil engineering structures. Due to the short duration and high variability in magnitude of potential impact loads, the issue of sub-optimal controller performance arises. In order to boost controller performance and improve the effectiveness of the control system, a radar-based impact load identifier is proposed. This radar-based impact load identifier will be used to estimate impact loads from imminent impacting objects, for example vessels and trucks, thus providing input information to the control system before the impact actually occurs. This paper presents the characterization and validation, through laboratory tests, of one part of the radar-based impact load identifier, the range and velocity estimation of the incoming moving objects. The range and velocity information are then used to direct structural control based on laboratory impact tests. An ultrawideband monostatic pulsed radar is used for range and velocity measurements of a laboratory-scale impacting vehicle. The range and velocity measurements obtained from the radar scans are verified using physical measurements and control testing. The tests showed great accuracy for both range and velocity with less than 3% error for each measurement and demonstrated structural control based on these measurements. It is shown from control system testing that the proposed approach is effective in reducing the structural impact responses by 11–30%, depending on the performance index, for pre-impact structural stiffening with passive control of MR dampers.

A Reliability Assessment Model for MR Damper Components within a Smart Structural Control Scheme

2008 ◽  
Vol 56 ◽  
pp. 218-224
Author(s):  
Maguid H.M. Hassan
Keyword(s):  
Structural Control ◽  
Inverse Dynamics ◽  
Mr Damper ◽  
Assessment Model ◽  
Resistance Force ◽  
Mr Dampers ◽  
Control Scheme ◽  
Smart Control ◽  
Control Devices ◽  
Magneto Rheological

Smart control devices have gained a wide interest in the seismic research community in recent years. Such interest is triggered by the fact that these devices are capable of adjusting their characteristics and/or properties in order to counter act adverse effects. Magneto-Rheological (MR) dampers have emerged as one of a range of promising smart control devices, being considered for seismic applications. However, the reliability of such devices, as a component within a smart structural control scheme, still pause a viable question. In this paper, the reliability of MR dampers, employed as devices within a smart structural control system, is investigated. An integrated smart control setup is proposed for that purpose. The system comprises a smart controller, which employs a single MR damper to improve the seismic response of a single-degree-of-freedom system. The smart controller, in addition to, a model of the MR damper, is utilized in estimating the damper resistance force available to the system. On the other hand, an inverse dynamics model is utilized in evaluating the required damper resistance force necessary to maintain a predefined displacement pattern. The required and supplied forces are, then, utilized in evaluating the reliability of the MR damper. This is the first in a series of studies that aim to explore the effect of other smart control techniques such as, neural networks and neuro fuzzy controllers, on the reliability of MR dampers.

scholarly journals Modeling of Magnetorheological Dampers under Various Impact Loads

2015 ◽  
Vol 2015 ◽  
pp. 1-20 ◽  
Author(s):  
K. Sarp Arsava ◽  
Yeesock Kim
Keyword(s):  
Structural Control ◽  
Experimental Studies ◽  
Mr Damper ◽  
Impact Behavior ◽  
Impact Loads ◽  
Mr Dampers ◽  
Fuzzy Models ◽  
Control Signals ◽  
And Control ◽  
The Impact

Magnetorheological (MR) damper has received great attention from structural control engineering because it provides the best features of both passive and active control systems. However, many studies on the application of MR dampers to large civil structures have tended to center on the modeling of MR dampers under seismic excitations, while, to date, there has been minimal research regarding the MR damper model under impact loads. Hence, this paper investigates nonlinear models of MR dampers under a variety of impact loads and control signals. Two fuzzy models are proposed for modeling the nonlinear impact behavior of MR dampers. They are compared with mechanical models, the Bingham and Bouc-Wen models. Experimental studies are performed to generate sets of input and output data for training, validating, and testing the models: the deflection, acceleration, velocity, and current signals. It is demonstrated that the proposed fuzzy models are effective in predicting the complex nonlinear behavior of the MR damper subjected to a variety of impact loads and control signals. The proposed fuzzy model resulted in an accuracy of 99% to predict the impact forces of the MR damper.

Research on the Application of the Electro-Hydraulic Digital Valve Control in the Lifting Device

2012 ◽  
Vol 591-593 ◽  
pp. 1715-1719
Author(s):  
Jin Tao Qu ◽  
Zhang Yong Wu ◽  
Xian Wang ◽  
Zhen Hua Duan ◽  
Yun Han Liu ◽  
...  
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Impact Load ◽  
Hydraulic Cylinder ◽  
Control Technology ◽  
Operation And Maintenance ◽  
Plate Velocity ◽  
The Impact ◽  
Valve Control ◽  
Control Accuracy

Aiming at solving the problems existing in a lifting device of electrolytic lead residual anode washing production line, this article proposes an solution on basis of the electro-hydraulic digital valve control system, then simulates the improved system using the software of MATLAB, the results show that the improved system has better repeat precision, simpler operation and maintenance and stronger anti-jamming capability by using the electro-hydraulic digital valve control technology; adopting the hydraulic cylinder as powerplant avoids the impact load during operation and gets a better control accuracy of the anode plate’ velocity and position; the high precision double cylinder synchro-control system is achieved by using the master-slave control strategy.

Optimum Control System for Seismic and Aerodynamic Flutter Response of Cable-Stayed Bridge Using Magnetorheological Dampers

2010 ◽  
Vol 163-167 ◽  
pp. 4269-4279 ◽  
Author(s):  
El Katt Mohamad ◽  
Shaker Raafat ◽  
Kassem Younis
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Simulation And Optimization ◽  
Mr Dampers ◽  
Cable Stayed Bridge ◽  
Fluid Damper ◽  
Smart Control ◽  
San Fernando ◽  
Fluid Dampers ◽  
Mr Fluid Damper

Control of cable-stayed bridge flutter for earthquake and aerodynamic hazard mitigation represents a relatively new area of research. This paper proposes a new optimized smart control system to mitigate the cable-stayed bridge flutter due to seismic and aerodynamic vibration. A Magnetorheological (MR) fluid damper, which belongs to the class of controllable fluid dampers, is proposed for use in a control strategy for mitigating its effect on the cable-stayed bridge. Genetic algorithm is adopted to determine the flutter acceleration levels, and corresponding forces of MR dampers. The optimized forces values from MR dampers are studied under the effect of five strong earthquakes recorded, known as El-Centro, Mexico City, San Fernando, Ker Country, and Northridge earthquakes. The time delay between the monitoring system and the actuator response is also studied. The simulation and optimization results shows that the proposed control strategy using MR dampers is the promising one of the applicable control methods to reduce the seismic and aerodynamic flutter vibration of the stayed bridge.

scholarly journals Experimental verification of a wireless sensing and control system for structural control using MR dampers

2007 ◽  
Vol 36 (10) ◽  
pp. 1303-1328 ◽  
Author(s):  
Chin-Hsiung Loh ◽  
Jerome P. Lynch ◽  
Kung-Chun Lu ◽  
Yang Wang ◽  
Chia-Ming Chang ◽  
...  
Keyword(s):  
Control System ◽  
Experimental Verification ◽  
Structural Control ◽  
Wireless Sensing ◽  
Mr Dampers ◽  
And Control

Design and Simulation of Smart Control System for Internet Traffic Distribution on Servers by Using Fuzzy Logic System

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Raid Daoud ◽  
Yaareb Al-Khashab
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Input Parameter ◽  
Traffic Density ◽  
The Internet ◽  
Linguistic Variables ◽  
Internet Service ◽  
Traffic Distribution ◽  
Smart Control ◽  
High Level

The internet service is provided by a given number of servers located in the main node of internet service provider (ISP). In some cases; the overload problem was occurred because a demand on a given website goes to very high level. In this paper, a fuzzy logic control (FLC) has proposed to distribute the load into the internet servers by a smart and flexible manner. Three effected parameters are tacked into account as input for FLC: link capacity which has three linguistic variables with Gaussian membership function (MF): (small, medium and big), traffic density with linguistic variables (low, normal and high) and channel latency with linguistic variables (empty, half and full); with one output which is the share server status (single, simple and share). The proposed work has been simulated by using MATLAB 2016a, by building a structure in the Fuzzy toolbox. The results were fixed by two manners: the graphical curves and the numerical tables, the surface response was smoothly changed and translates the well-fixed control system. The numerical results of the control system satisfy the idea of the smart rout for the incoming traffics from the users to internet servers. So, the response of the proposed system for the share of server ratio is 0.122, when the input parameter in the smallest levels; and the ratio is 0.879 when the input parameters are in highest level. The smart work and flexible use for the FLC is the main success solution for most of today systems control.

Developing and Research on Motion Controller Based on CPLD and MCU

2012 ◽  
Vol 490-495 ◽  
pp. 456-459
Author(s):  
Jun Han ◽  
Rui Li Chang
Keyword(s):  
Control System ◽  
High Speed ◽  
Servo Control ◽  
Numerical Control ◽  
Control Technology ◽  
Numerical Control System ◽  
Motion Controller ◽  
Research Focus ◽  
Open Cnc ◽  
Computer Numerical Control System

Open Computer Numerical Control system (Open CNC) based on PC and the Windows operating system has been a major developing direction and a research focus of the current numerical control technology. At present, there have been all kinds of the Open CNC systems with high-speed and precision servo control boards, but they are too expensive. Therefore, developing an economical and practical motion controller is great significant for middle and small numerical control system

Research and Design of Intelligent Lighting Control System Based on Industrial Wireless Technology

2011 ◽  
Vol 467-469 ◽  
pp. 620-624 ◽  
Author(s):  
Jun Wang ◽  
Wei Ru Chen
Keyword(s):  
Control System ◽  
The Internet ◽  
Control Technology ◽  
Wireless Technology ◽  
Lighting Control ◽  
Turn On ◽  
Point Control ◽  
The Cost ◽  
Research And Design ◽  
The Internet Of Things

The intelligent lighting control system is one of typical applications of the Internet of things. The method of intelligent lighting control system based on industrial wireless technology is proposed in the paper. It used proposed three-point-control technology, and adjusting the brightness of lamps, turn on/off the lamps and a part of fault detection can be realized. At the same time, it can greatly reduce the cost of system. It will be useful to engineer and researchers.

Integrating a novel smart control system for outdoor lighting infrastructures in ports

2021 ◽  
Vol 246 ◽  
pp. 114684
Author(s):  
Nikolaos Sifakis ◽  
Konstantinos Kalaitzakis ◽  
Theocharis Tsoutsos
Keyword(s):  
Control System ◽  
Smart Control

The Application of the Vector Control in Centrifuge

2012 ◽  
Vol 490-495 ◽  
pp. 2937-2941
Author(s):  
Feng Ou ◽  
Hong Chen ◽  
Xin Xiong
Keyword(s):  
Control System ◽  
Vector Control ◽  
Regulation System ◽  
Control Technology ◽  
Speed Regulation ◽  
Regulation Method ◽  
Very High

In order to ensure the stably operation for centrifuge, this paper presents a new speed regulation method based on the vector control technology, and designs the control system with the inverter for the centrifuge. The paper introduces the fundamental principal of vector control, and analyses the power and torque required for the centrifuge from the result of the calculation and simulation. At last, the paper shows the result the application of the vector control technology in centrifuge. The result shows that the vector control speed regulation system is simple, reliable, and its acceleration stability is very high. The analysis can also provide a reference for similar centrifuge design personnel

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