Method of multi-mode vibration control for the carbody of high-speed electric multiple unit trains

2017 ◽  
Vol 409 ◽  
pp. 94-111 ◽  
Author(s):  
Dao Gong ◽  
Jinsong Zhou ◽  
Wenjing Sun ◽  
Yu Sun ◽  
Zhanghui Xia
Keyword(s):  
Vibration Control ◽  
High Speed ◽  
Mode Vibration ◽  
Multiple Unit ◽  
Multi Mode

Theory and application of multi-mode vibration control systems

2012 ◽  
Vol 227 (1) ◽  
pp. 65-73
Author(s):  
Rujian Ma ◽  
Xiaobing Luo
Keyword(s):  
Vibration Control ◽  
Control Systems ◽  
Parameter Optimization ◽  
Degree Of Freedom ◽  
Optimal Parameters ◽  
Control Effect ◽  
Mass Damper ◽  
Mode Vibration ◽  
Multi Mode ◽  
Dynamic Magnification Factor

The theoretical analysis of vibration control of multiple-degree-of-freedom structures with multi-mode vibration control systems is presented in this article. A new method of parameter optimization of the multiple-tuned mass damper system was proposed in order to obtain the best control effect, where the minimum of the dynamic magnification factor is used as the optimal objective. The numerical examples of parameter optimization indicate that optimal parameters can be obtained for the multiple-degree-of-freedom system to get satisfactory control effects. The application of the theory is used for the vibration control simulation of an offshore platform. The results indicate that reasonable control effects can be obtained by controlling the first mode and the control effects increase about 10% in average when the first two modes are controlled simultaneously.

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.

Multi-Mode Vibration Control of Plates Using a Single Actuator and a Single Sensor

2016 ◽  
Author(s):  
Majed A. Majeed ◽  
Khaled Alhazza ◽  
Altaf AlSnafi
Keyword(s):  
Vibration Control ◽  
Equations Of Motion ◽  
Linear Equations ◽  
Single Input Single Output ◽  
Coupled Equations ◽  
Single Output ◽  
Accelerometer Signal ◽  
Mode Vibration ◽  
Single Sensor ◽  
Multi Mode

Multi-mode vibration control using single actuator and single sensor is considered as a difficult control scheme. Most researchers use multi actuators and multi controllers to control multimode structural vibrations. In the present work, a multi-mode control model consists of a single actuator and single sensor, both attached at the top of simply supported thin plate, is developed. A piezoelectric actuator is used and it is assumed to be perfectly bonded to the plate, which means the bonding thickness is neglected. The sensed accelerometer signal is integrated and then filtered to include only the first and the second vibration modes. The linear equations of motion of the plate are derived and discretized using Galerkin’s Method. The resulting coupled equations are combined with velocity delay feedback controller to reduce the structure vibration. Genetic Algorithm is then used to optimize controller parameters using the root mean square of the input signal as an objective function. The results showed that the use of single-input single-output (SISO) delay feedback multimode controller can efficiently be used on any structure to control multimode systems.

524 Motion and Multi mode Vibration Control of Flexible Rotor Using Magnetic Bearings

2004 ◽  
Vol 2004 (0) ◽  
pp. _524-1_-_524-6_
Author(s):  
Yuichi NAKAJIMA ◽  
Mitsuhiro ICHIHARA ◽  
Takahito SAGANE ◽  
Kazuto SETO ◽  
Muneharu SAIGO
Keyword(s):  
Vibration Control ◽  
Magnetic Bearings ◽  
Flexible Rotor ◽  
Mode Vibration ◽  
Multi Mode

Investigation of Locking Force of Stay Cable Vibration Control Using Magneto-Rheological Fluid Damper

Aerospace ◽  
2006 ◽  
Author(s):  
Liu Min ◽  
Vineet Sethi ◽  
Gangbing Song ◽  
Hui Li
Keyword(s):  
Vibration Control ◽  
Smart Materials ◽  
Mr Damper ◽  
Pole Placement ◽  
Stay Cable ◽  
Cable Vibration ◽  
Bridge Model ◽  
Mode Vibration ◽  
Magneto Rheological ◽  
Multi Mode

This paper analyzes the locking force of a stay cable equipped with a Magneto-rheological (MR) damper. For the single mode vibration of the stay cable, the formula of the locking force is derived and the important factors that affect the locking force are analyzed. The experimental investigations of the locking force of the stay cable vibration control are carried out on a cable-stayed bridge model equipped with an MR damper to verify of the computational locking force in the Smart Materials and Structures Laboratory at University of Houston. For the multi-mode vibration of the stay cable, the modal shapes of the stay cable vibration are estimated by utilizing a pole placement observer using the acceleration values at selected locations of the stay cable and the locking forces of the stay cable in multi-mode vibration are numerically obtained. In all experimental cases, the locking forces based on the analytical and numerical formulas approximately match the experimental results.

MULTI-MODE VIBRATION CONTROL AND POSITION ERROR ANALYSIS OF PARALLEL MANIPULATOR WITH MULTIPLE FLEXIBLE LINKS

2010 ◽  
Vol 34 (2) ◽  
pp. 197-213 ◽  
Author(s):  
Xuping Zhang ◽  
James K. Mills ◽  
William L. Cleghorn
Keyword(s):  
Vibration Control ◽  
Parallel Manipulator ◽  
Position Error ◽  
Flexible Link ◽  
Flexible Links ◽  
Position Errors ◽  
Mode Vibration ◽  
Moving Platform ◽  
Multi Mode ◽  
Modal Space

This paper presents multi-mode vibration control and analysis of moving platform position errors of a planar 3-PRR parallel manipulator with three flexible intermediate links using PZT transducers. The active vibration controller is designed in modal space with modal filters and modal synthesizers determined from the flexible link vibration characteristics. Estimation of the moving platform position error is conducted using measurements of the flexible link deflection from PZT sensors mounted on the flexible intermediate links. An effective strategy for determining the control gains to reduce the vibrations of higher order modes is proposed through modification of the independent modal space control (IMSC) method. The proposed independent modal control strategy is experimentally implemented with first two modes targeted for control on a parallel manipulator with multiple flexible links. The experimental results show that the vibrations of the first two modes are effectively suppressed, and the position error of the moving platform is substantially reduced.

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