Journal ArticleDOI
Dynamic performance and control of squeeze mode MR fluid damper–rotor system
TLDR
In this paper, the magnetic pull force between the magnetic poles in the damper was analyzed theoretically, and it was shown that the damping force can decrease both the first critical speed and the critical amplitude, but increase the amplitude in a speed range between two undamped critical speeds.Abstract:
By using magnetorheological (MR) fluid in place of lubricating oil in a traditional squeeze film damper (SFD), one can build a variable-damping SFD, thereby controlling the vibration of a rotor by controlling the magnetic field. Assuming a Bingham model, the Reynolds equation for an MR fluid squeeze film is developed and solved to provide expressions for the velocity, the pressure distribution and the damping force. Electromagnetic theory is used to calculate the magnetic pull force between the magnetic poles in the damper. The mechanical properties of the squeeze film and the unbalance response characteristics of an MR fluid SFD–rigid rotor system are analyzed theoretically. An MR fluid SFD is designed and manufactured, and the unbalance response properties and control method of a flexible rotor supported on the damper are studied experimentally. The study shows that the magnetic pull force can decrease both the first critical speed and the critical amplitude; the film damping force can decrease the amplitude at the undamped critical speeds, but increase the amplitude in a speed range between two undamped critical speeds. The damper may have the best control effect to minimize the vibration within the range of all working speed by using the on–off control method.read more
Citations
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Journal ArticleDOI
A review on the simulation and modeling of magnetorheological fluids
TL;DR: In this article, the magnetorheological fluids are classified as smart materials with controllable rheological properties, and the fast growing application of magnetors in recent years has increased the...
Journal ArticleDOI
The performance of magnetorheological fluid in squeeze mode
TL;DR: In this article, the performance of an MR fluid in compression (squeeze) mode has been studied with the magnetic field being generated by a coil carrying different magnitudes of DC electrical current.
Journal ArticleDOI
Design and modeling of semi-active squeeze film dampers using magneto-rheological fluids
TL;DR: In this article, a controllable semi-active squeeze film dampers (SFD) using magneto-rheological fluids is presented, which can suppress unbalanced vibrations in rotor systems, particularly supported by rolling element bearings.
Journal ArticleDOI
Magnetic circuit design for the squeeze mode experiments on magnetorheological fluids
TL;DR: In this article, the authors present the design of test equipment for the performance of compression and tension tests of magnetorheological fluid in a vertical direction to the DC magnetic field generated by a coil.
Journal ArticleDOI
Dynamic Testing and Modeling of an MR Squeeze Mount
TL;DR: In this paper, an effective mathematical model of the MR squeeze mount for steady-state testing was built which includes the effect of the inertia of the fluid, and the results showed that the compression force and the area of the hysteresis loop increase with the increase of excitation amplitude or applied current and it will decrease with an increase of frequency or initial gap.
References
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Journal ArticleDOI
Magnetorheological fluid devices: Principles, characteristics and applications in mechanical engineering
TL;DR: In this article, the modes of operation of MR fluid devices are analyzed and a comprehensive review is presented of the principles, characteristics and engineering applications of the MR fluids devices (especially dampers) studied in the last decade.
Journal ArticleDOI
Vibration control using smart fluids : A state-of-the-art review
TL;DR: In this paper, the authors present a state-of-the-art review of smart fluids in vibration control, and summarize the operating mechanisms of the two key smart fluids-electro-rheological (ER) and magneto-Rheological(MR) fluids.
Journal ArticleDOI
A Magnetorheological Fluid Damper for Rotor Applications
TL;DR: In this paper, an electrorheological and magnetorheological (MR) damper is proposed for rotor dampers. But the design of the damper was not discussed.
Journal ArticleDOI
Controllable Squeeze Film Damper (An Application of Electro-Rheological Fluid)
Shin Morishita,Jun'ichi Mitsui +1 more
Journal ArticleDOI
Electro-Rheological Multi-layer Squeeze Film Damper and Its Application to Vibration Control of Rotor System
TL;DR: In this article, a new electro-rheological multi-layer squeeze film damper (ERMSFD) is designed and the constitutional Reynolds equation is established, and an on/off control is proposed to control the large amplitude around the first critical speed.