scholarly journals Vertical vibration control of suspension bridges subjected to earthquake by Semi-active MR dampers

2017 ◽  
Vol 24 (2) ◽  
pp. 439-451 ◽  
Author(s):  
Saeid Pourzeynali ◽  
Arash Bahar ◽  
Solmaz Pourzeynali
Keyword(s):  
Vibration Control ◽  
Vertical Vibration ◽  
Suspension Bridges ◽  
Mr Dampers

scholarly journals Seismic Vibration Control of 3D Steel Frames with Irregular Plans Using Eccentrically Placed MR Dampers

2017 ◽  
Vol 9 (7) ◽  
pp. 1255 ◽  
Author(s):  
Yuwen Hu ◽  
Lingfei Liu ◽  
Saeed Rahimi
Keyword(s):  
Vibration Control ◽  
Steel Frames ◽  
Seismic Vibration ◽  
Mr Dampers

Vibration Control of a New Bed Stage System for Ambulance Using MR Dampers

2014 ◽  
Author(s):  
Hee-Dong Chae ◽  
Seung-bok Choi ◽  
Jong-Seok Oh
Keyword(s):  
Mathematical Model ◽  
Vibration Control ◽  
Vibration Isolation ◽  
Design Parameters ◽  
Ride Quality ◽  
Vibration Level ◽  
Mr Dampers ◽  
Secondary Damage ◽  
Stage System ◽  
Magneto Rheological

This paper proposes a new bed stage for patients in ambulance vehicle in order to improve ride quality in term of vibration control. The vibration of patient compartment in ambulance can cause a secondary damage to a patient and a difficulty for a doctor to perform emergency care. The bed stage is to solve vertical, rolling, and pitching vibration in patient compartment of ambulance. Four MR (magneto-rheological) dampers are equipped for vibration isolation of the stage. Firstly, a mathematical model of stage is derived followed by the measurement of vibration level of patient compartment of real ambulance vehicle. Then, the design parameters of bed stage is undertaken via computer simulation. Skyhook, PID and LQR controllers are used for vibration control and their control performances are compared.

Discussion of “Vertical Vibration Analysis of Suspension Bridges”

1981 ◽  
Vol 107 (10) ◽  
pp. 2037-2038
Author(s):  
Hassan I.A. Hegab
Keyword(s):  
Vibration Analysis ◽  
Vertical Vibration ◽  
Suspension Bridges

Closure to “Vertical Vibration Analysis of Suspension Bridges”

1982 ◽  
Vol 108 (4) ◽  
pp. 952-952
Author(s):  
Ahmed M. Abdel-Ghaffar
Keyword(s):  
Vibration Analysis ◽  
Vertical Vibration ◽  
Suspension Bridges

Vertical Vibration Control of an Active Vibration Isolation table loading Elastic Tower-like Object

2017 ◽  
Vol 2017 (0) ◽  
pp. 209
Author(s):  
Yuya KOBAYASHI ◽  
Takahiro UEDA ◽  
Takayuki TERAUCHI ◽  
Toru WATANABE
Keyword(s):  
Vibration Control ◽  
Vibration Isolation ◽  
Vertical Vibration ◽  
Active Vibration ◽  
Active Vibration Isolation

21617 Passive Vibration Control for Connected Four High-Rise Buildings with MR dampers

2007 ◽  
Vol 2007.13 (0) ◽  
pp. 11-12
Author(s):  
Shingo MITANI ◽  
Shigeru INABA ◽  
Chinori IIO ◽  
Fadi DOHNAL ◽  
Kazuto SETO ◽  
...  
Keyword(s):  
Vibration Control ◽  
Passive Vibration Control ◽  
High Rise ◽  
Mr Dampers

1211 Semi-active Vibration Control for Connected Four High-Rise Buildings with MR dampers

2007 ◽  
Vol 2007.10 (0) ◽  
pp. 67-72
Author(s):  
Shigeru INABA ◽  
Chinori IIO ◽  
Shingo MITANI ◽  
Toru WATANABE ◽  
Kazuto SETO
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
High Rise ◽  
Mr Dampers ◽  
Active Vibration

Experimental Study on Multi-Mode Vibration Control of a Stay Cable with a Passive Magnetorheological Damper

2013 ◽  
Vol 361-363 ◽  
pp. 1402-1405
Author(s):  
Zhi Hao Wang
Keyword(s):  
Vibration Control ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Test Results ◽  
Stay Cable ◽  
Mr Dampers ◽  
Stay Cables ◽  
Modal Damping ◽  
Mode Vibration ◽  
Multi Mode

Effective vibration control technology for stay cables is extremely critical to safe operations of cable-stayed bridges. For super-long cables, passive linear damper cannot provide sufficient damping since it can be only optimum for a given mode of cable, while a long cable may vibrate with several modes. This paper focuses on multi-mode vibration control of stay cables with passive magnetorheological (MR) dampers. Firstly, a 21.6m-long model cable was designed and established in the laboratory.Then, control performance of the cable with a passive MR damper was tested. The test results show that modal damping ratios of the cable in the first four modes can be improved significantly with the MR damper. It is further demonstrated that optimal tuned passively operated MR damper can outperform the passive viscous damper.

New results on an electropneumatic active seat suspension system

2000 ◽  
Vol 214 (5) ◽  
pp. 533-544 ◽  
Author(s):  
G. J. Stein
Keyword(s):  
Vibration Control ◽  
Control Valve ◽  
Pressure Control ◽  
Random Excitation ◽  
Vertical Vibration ◽  
Flow Control Valve ◽  
Heavy Vehicles ◽  
Seat Suspension ◽  
Pressure Control Valve ◽  
Vibration Compensation

A vibration control system with an air spring as the actuator and proportional electropneumatic control has been developed at the Institute of Materials and Machine Mechanics, Bratislava. As the electropneumatic transducer, a proportional pressure control valve is used in contrast to the previously used proportional flow control valve. The vibration control is facilitated by a combination of a ‘sky hook’ feedback loop and a feedforward loop working on the so-called ‘sky cloud’ principle, compensating base vertical vibration. Good agreement between simulation results and measurement on a laboratory dummy system was observed. The dummy system was also subjected to narrow-band random excitation, prescribed for standardized laboratory tests of driver's seats. The improvement in driver's seat vibration control properties owing to the feedforward vibration compensation is 2.5-fold, i.e. by 8 dB in comparison with ‘sky hook’ feedback damping only. The system could be used for vibration control in automotive applications, especially for vehicles with an unsprung chassis (earth-moving machines, wheeled tractors) and in the heavy vehicles sector.

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