Vibration Suppression of Traffic Signal Pole by Generating Electrical Power

2013 ◽  
Author(s):  
Taichi Matsuoka ◽  
Takuya Wada ◽  
Mizuki Katakura
Keyword(s):  
Vibration Suppression ◽  
Electrical Power ◽  
Small Deformation ◽  
Electrical Energy ◽  
Traffic Signal ◽  
Shaking Table ◽  
Scale Model ◽  
Small Scale ◽  
Damping Force ◽  
Small Scale Model

The authors propose a damper that generates electrical power in order to not only suppress vibration and also get electrical energy when many traffic signal poles are oscillated by wind, traffic turbulence, and earthquake. The damper consists of a displacement magnifying mechanism by using levers, solenoid coils and rare-earth magnets. It is useful for small deformation between a beam and a column of the traffic pole. Vibration modes of the pole are analyzed by using FEM, and then a small scale model of the traffic pole is built up. The small scale model has 2.3 m high, consists of a steel column and a cantilever beam due to rescale about 1/3 of real scale one, and natural frequency is about 3.5 Hz. Trial damper is manufactured and a damping force, which is caused by the coils crossing magnetic field, is adjusted. Dynamic characteristics of the trial damper are measured by a shaking actuator. In order to confirm vibration reduction, both of seismic and harmonic vibration tests of small scale model when the trial damper is installed are carried out by using a shaking table. The experimental results of harmonic responses are compared with the calculated results by FEM, and effect of vibration suppression and efficiency of generating power are discussed experimentally and numerically.

Seismic Performance of Vibration Control Device That Generates Power

2009 ◽  
Author(s):  
Taichi Matsuoka ◽  
Katsuaki Sunakoda ◽  
Kazuhiko Hiramoto ◽  
Issei Yamazaki ◽  
Akira Fukukita ◽  
...  
Keyword(s):  
Vibration Control ◽  
Earthquake Engineering ◽  
Vibration Suppression ◽  
Experimental Testing ◽  
Control Device ◽  
Shaking Table ◽  
Ball Screw ◽  
Scale Model ◽  
Small Scale ◽  
Wide Range

In a previous paper the authors proposed a semi-active vibration control device (VCD) that generates power. The device utilizes a ball screw, and has inertial and damping forces. The damping coefficient is adjusted by altering resistance at the terminal of the power generator. A small-scale VCD was manufactured for experimental testing. Frequency responses of a small-scale spring mass structure were measured in order to confirm the effects of vibration suppression within a wide range of frequencies. In this paper, as the next step, vibration tests using a benchmark structure with an installed VCD that has a 30 kN capacity are carried out at the National Center for Research on Earthquake Engineering (NCREE) in Taiwan. The benchmark structure has three stories with a 3 m height and a mass of 6 tons at each floor level for a total height and weight of 9 m and 18 tons, respectively. The VCDs are installed between adjacent floors with steel chevron braces. A simple control law that is based on a minimized Lyapunov function and employs bang-bang operation is used as a variable current controller instead of the modifying the resistance level of the VCD. Scaled earthquake motions including the Imperial Valley El Centro north-south component that is normalized to be a peak level of 0.5 m/s2, are applied to the base of the steel framed structure in the horizontal direction by a shaking table. Experimental responses of each floor for the uncontrolled and controlled cases are compared with analytical responses, and effects of vibration suppression for the large-scale model are discussed quantitatively.

Vibration Tests of 3-Story Benchmark Structure With Three Semiactive Dampers

2010 ◽  
Author(s):  
Taichi Matsuoka ◽  
Katsuaki Sunakoda ◽  
Kazuhiko Hiramoto ◽  
Issei Yamazaki ◽  
Akira Fukukita ◽  
...  
Keyword(s):  
Lyapunov Function ◽  
Seismic Isolation ◽  
Vibration Suppression ◽  
Load Capacity ◽  
Electrical Power ◽  
Inertial Force ◽  
Shaking Table ◽  
Control Effect ◽  
Damping Force ◽  
Vibration Tests

In a previous paper the authors developed a semiactive damper that generates electrical power, and carried out vibration tests using a 3-story benchmark structure at NCREE, Taiwan in 2006. At that time, the dampers were installed at 1st and 2nd floors. The damper has a large inertia mass by flywheel and controllable damping force by generator, and a load capacity of 30 kN. In the test, the damper at 1st floor was only controlled by Bang-bang control that was based on Lyapunov function. In this paper as the next step, in order to demonstrate more effectiveness of vibration suppression, the dampers are installed at all floors of the 3-story structure, and vibration tests using the same structure are carried out again in 2008. The control law which is proposed here is based on Lyapunov function or predictive switching control for all of damper at each floor. The structure has 9 m high, 3 m wide, 2 m span, 18 tons total weight. Several earthquake waves normalized to be 150 gal are inputted horizontally to the base by a shaking table, and the seismic responses of each floor are estimated quantitatively. It is obviously from the experimental results that the seismic reductions for acceleration and displacement in case of large inertia mass are much better than the case of small one, but control effect is decreasing. Because seismic reduction can be depended on a balance between inertial force and controllable damping force, and plus the one of the reason is time delay of the damper. At last, we can summarize that the semiactive damper is available for seismic isolation in practical use.

Experimental Study of Dynamic Properties for Serially Isolated System

2011 ◽  
Vol 250-253 ◽  
pp. 2814-2817
Author(s):  
Dong Bing Zhang ◽  
Xiang Lin Jiang ◽  
Yan Hui Liu
Keyword(s):  
Experimental Study ◽  
Dynamic Properties ◽  
Tensile Force ◽  
Shaking Table ◽  
Scale Model ◽  
Small Scale ◽  
Natural Period ◽  
The Difference ◽  
Isolation Device ◽  
Small Scale Model

This paper presents a new-style isolation device for serially isolated system by the dynamic analysis to serially isolated system. This device has small horizontal stiffness and the difference of this device with rubber-lead bearing is that this device can resist biggish vertical tensile force. Then the experiment for small-scale model of this device based on sweep sine shaking table is processed. The results show serially isolated system with this device can prolong natural period of serial system and effectively decrease the response of superstructure and have good isolated performance and stability.

Wave Energy Hyperbaric Device for Electricity Production

2007 ◽  
Author(s):  
Segen F. Estefen ◽  
Paulo Roberto da Costa ◽  
Eliab Ricarte ◽  
Marcelo M. Pinheiro
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
Experimental Results ◽  
Electricity Production ◽  
Scale Model ◽  
Small Scale ◽  
Regular Waves ◽  
Hyperbaric Chamber ◽  
Small Scale Model

Wave energy is a renewable and non-polluting source and its use is being studied in different countries. The paper presents an overview on the harnessing of energy from waves and the activities associated with setting up a plant for extracting energy from waves in Port of Pecem, on the coast of Ceara State, Brazil. The technology employed is based on storing water under pressure in a hyperbaric chamber, from which a controlled jet of water drives a standard turbine. The wave resource at the proposed location is presented in terms of statistics data obtained from previous monitoring. The device components are described and small scale model tested under regular waves representatives of the installation region. Based on the experimental results values of prescribed pressures are identified in order to optimize the power generation.

Staged-Air Ratio Optimization for a New Down-Fired Technology within a Cold Small-Scale Model of a 350 MWeUtility Boiler

2011 ◽  
Vol 25 (4) ◽  
pp. 1485-1496 ◽  
Author(s):  
Min Kuang ◽  
Zhengqi Li ◽  
Pengfei Yang ◽  
Jinzhao Jia ◽  
Qunyi Zhu
Keyword(s):  
Scale Model ◽  
Small Scale ◽  
Ratio Optimization ◽  
Small Scale Model

scholarly journals Monitoring deformation of small scale model tunnels under load testing

Survey Review ◽  
2014 ◽  
Vol 46 (339) ◽  
pp. 417-425 ◽  
Author(s):  
H-M. Chen ◽  
M. Smith ◽  
H-S. Yu ◽  
N. Kokkas
Keyword(s):  
Scale Model ◽  
Small Scale ◽  
Load Testing ◽  
Small Scale Model

A small-scale model of factor VIII and factor IX fractionation from plasma

1989 ◽  
Vol 10 (4) ◽  
pp. 279-286 ◽  
Author(s):  
Peter Feldman ◽  
Lowell Winkelman ◽  
Helen Evans ◽  
Martin Pinnell ◽  
Fiona Murdoch ◽  
...  
Keyword(s):  
Factor Viii ◽  
Factor Ix ◽  
Scale Model ◽  
Small Scale ◽  
Small Scale Model
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