Experimental Study on Vibration Properties and Control of Squeeze Mode MR Fluid Damper-Flexible Rotor System

2003 ◽  
Author(s):  
Jianxiao Wang ◽  
Guang Meng ◽  
Eric Hahn
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Rotor System ◽  
Flexible Rotor ◽  
Mr Fluid ◽  
Oil Film ◽  
Critical Speeds ◽  
Fluid Damper ◽  
Mr Fluid Damper ◽  
And Control

A squeeze mode MR fluid damper used for rotor vibration control is designed and manufactured, and the unbalance response properties and control method of a single-disk flexible rotor system supported by the damper are studied experimentally. It is found from the study that the magnetic pull force can decrease both the first critical speed and the critical amplitude; the oil film reaction force can decrease the amplitude at the undamped critical speeds, but increase the amplitude in a speed range between two undamped critical speeds. For the rotor system supported by a journal bearing and an MR fluid damper, it is possible to appear oil film instability as the increasing of the control current. The damper may have the best effect to make the vibration minimize within the range of all working speed by using on-off control method. The research show that the squeeze mode MR fluid damper has the advantages such as simple structure, clearly effectiveness, quick response, etc., and this kind of damper has a promising potential future in vibration control of flexible rotor systems.

Study of the Vibration Control of a Rotor System Using a Magnetorheological Fluid Damper

2005 ◽  
Vol 11 (2) ◽  
pp. 263-276 ◽  
Author(s):  
J. Wang ◽  
G. Meng
Keyword(s):  
Magnetic Field ◽  
Vibration Control ◽  
Control Method ◽  
Rotor System ◽  
Shear Mode ◽  
Rotor Vibration ◽  
Mr Fluid ◽  
Critical Speeds ◽  
Fluid Damper ◽  
Mr Fluid Damper

A shear mode magnetorheological (MR) fluid damper used for rotor vibration control is designed and manufactured, and the theoretical model of a cantilevered rotor system with the MR fluid damper is established. The response properties of the rotor system are studied theoretically and experimentally. It is found from the study that the Coulomb friction of the damper is increased as the magnetic field strength applied to the MR fluid increases. As a result, the vibration amplitude of the rotor system supported by the MR damper is decreased near the undamped critical speeds, but is increased in a rotating speed range between the first and the second undamped critical speeds. At the same time, the damped critical speed of the rotor system is increased with the increase of the applied magnetic field. Based on these characteristics, a simple on-off control method is used to suppress the rotor vibration across the critical speeds, and the results show that the method is very effective.

Experiments on the Vibration Control of Flexible Rotor Using Shear Mode MR Elastomer Damper

2012 ◽  
Vol 215-216 ◽  
pp. 741-745 ◽  
Author(s):  
Jian Xiao Wang ◽  
Shi Wang Wang
Keyword(s):  
Magnetic Field ◽  
Vibration Control ◽  
Control Method ◽  
Silicone Oil ◽  
Active Vibration Control ◽  
Mr Damper ◽  
Rotor System ◽  
Shear Mode ◽  
Flexible Rotor ◽  
Critical Speeds

A shear mode magnetorheological (MR) elastomer damper is designed and manufactured, in which the MR elastomer is made by mixing RTV silicone, carbonyl iron particles and silicone oil, and solidifying under magnetic field. A flexible cantilever rotor system with single disk is constructed, and the controllability, effectiveness and stability of vibration control for the imbalance response of the rotor system using the MR damper are experimentally studied. From the test, it is found that as the strength of applied magnetic field increases, the damping and stiffness of the damper are increased; the critical speeds of the rotor system supported on the MR damper is increased distinctly, and the vibration at two critical speeds are restrained; the on-off control method may be used to control the rotor vibration while passing through the two critical speeds. The study shows that the shear mode MR elastomer damper is suitable for active vibration control of flexible rotor.

Experimental Investigation on Boring Tool Vibration Control Using MR Fluid Damper

2016 ◽  
Vol 15 (01) ◽  
pp. 13-25 ◽  
Author(s):  
E. Mohan ◽  
U. Natarajan
Keyword(s):  
Vibration Control ◽  
Research Work ◽  
Machining Process ◽  
Work Piece ◽  
Mr Fluid ◽  
Tool Vibration ◽  
Fluid Damper ◽  
Boring Tool ◽  
Mr Fluid Damper

In the manufacturing industry, most of the components are made by machining operations. The performance of the product to a large extent is dependent on the accuracy and consistency of the machining processes. Various parameters are considered to achieve the high quality of the machining. Out of which, vibration is one of the important parameters that will lead poor quality of the product and also reduce the tool life. Vibrations are induced by metal cutting operation during machining. Turning operations and especially boring operations are associated with severe vibration-related problems. Boring operation is often done with a boring bar, which is necessarily long and slender so that it can fit into the multipart work piece geometry. Such tools are lack of dynamic stiffness and stability, this manufacturing operation is repeatedly plagued with self-excited vibrations known as chatter. Magnetorheological (MR) fluid is employed in this research work to control the vibration of a boring tool. The MR fluid damper has received great attention due to its ability to reversibly change from a free flowing, linear, viscous liquid to a semi-solid when exposed to magnetic fields in just a few milliseconds and was also found to be effective in suppressing tool vibration. Vibration control during machining process is an important tactic to suppress the chatter vibration. The aim of this approach is to reduce the relative displacements between the tool and the work piece during the machining process.

Vibration Analysis and Control of Nuclear Power Crane with MRFD

2018 ◽  
Vol 10 (08) ◽  
pp. 1850093 ◽  
Author(s):  
Yi Xiao Qin ◽  
Bo Lun Li ◽  
Xin Li ◽  
Yan Qing Li ◽  
Zhi De Zhang ◽  
...  
Keyword(s):  
Vibration Control ◽  
Working Conditions ◽  
Control Strategy ◽  
Vibration Analysis ◽  
Nuclear Power ◽  
Control Method ◽  
Control Model ◽  
Fluid Damper ◽  
Magneto Rheological ◽  
And Control

The nuclear power crane is required to have high security and stability, as its lifting mechanism and span structure are needed to perform predominantly in serious working conditions. A new vibration analysis and control method on the nuclear power crane is proposed to improve its stability, which is based on magneto rheological fluid damper (MRFD) and switch algorithm control strategy. The simulation is completed through dynamic model and control model. The experiment is accomplished in a serving crane. Both numerical simulated and experimental results show that the vibration of nuclear power crane is suppressed significantly with MRFD. It is proved that MRFD should be taken into consideration in the vibration control of nuclear power crane.

Multiple Smart Material Applications Using SMA and MR Fluid Damper for Rotor Vibration Control

2010 ◽  
Author(s):  
T. S. Aravindhan ◽  
K. Gupta
Keyword(s):  
Vibration Control ◽  
Smart Materials ◽  
Resonance Condition ◽  
Mr Damper ◽  
Experimental Results ◽  
Rotor Vibration ◽  
Mr Fluid ◽  
Fluid Damper ◽  
Mr Fluid Damper ◽  
Rotor Model

Application of two smart materials, namely shape memory alloy (SMA) and magnetorheological fluid (MRF) for rotor vibration control is explored to control the synchronous vibration of rotors crossing resonance condition. First a single degree of freedom system is analyzed to study the effect of SMA and MR fluid damper individually, and then the simulations are repeated to find the feasibility of using the two smart materials simultaneously. An MRF damper is designed, fabricated and installed on a rotor system. The fabricated MR damper is tested and an ANFIS model is trained to predict the damper force in the simulations carried out. The experimental rotor model is analyzed using finite element method in Matlab™. Simulations are carried out to study the effect of MR damper on rotor vibration response. Experimental results obtained from the rotor model with the fabricated MRF damper show considerable reduction in peak vertical amplitude as the current in the MR damper coils is increased. A good correlation between the theoretical and experimental results is observed.

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