Design of a novel magneto-rheological squeeze-film damper

Carmignani, Costantino; Forte, Paola; Rustighi, Emiliano

doi:10.1088/0964-1726/15/1/045

Cited by 67 publications

(43 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Higher stresses can be obtained with coarser particle sizes (Genc and Phule 2002). From another point of view, the studies of compressive stress of MR fluids in squeeze mode conducted by many researches were mainly on squeeze film dampers for rotor applications (Forte et al 2004, Ahn et al 2004, Carmignani et al 2006. They worked on the performance of the squeeze film damper in dynamic behaviour according to the magnetic field strength.…”

Section: Introductionmentioning

confidence: 99%

“…Forte et al (2004) have been carrying out a preliminary test to obtain the optimum conditions for each steady rotational speed of MR squeeze film damper. Latter, Carmignani et al (2006), continued to work on the effectiveness in dampening the rotor vibrations and controlling its dynamic characteristics. In any event, however, not many people have done experiments in quasi-static tests to characterize MR fluid under compression stress.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Mazlan¹,

Ekreem²,

Olabi³

2008

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Abstract. This paper presents an experimental investigation of two different magnetorheological (MR) fluids, namely water-based and hydrocarbon-based MR fluids in compression mode under various applied currents. Finite Element Method Magnetics was used to predict the magnetic field distribution inside the MR fluids generated by a coil. A test rig was constructed where the MR fluid was sandwiched between two parallel cylinders. During the compression, the upper cylinder was moved towards the lower cylinder in a vertical direction. Stress-strain relationships were obtained for arrangements of equipment where each type of fluid was involved, using compression test equipment. The apparent compressive stress was found to be increased with the increase in magnetic field strength. In addition, the apparent compressive stress of the water-based MR fluid showed a response to the compressive strain of greater magnitude. However, during the compression process, the hydrocarbon-based MR fluid appeared to show a unique behaviour where an abrupt pressure drop was discovered in a region where the apparent compressive stress would be expected to increase steadily. The conclusion is drawn that the apparent compressive stress of MR fluids is influenced strongly by the nature of the carrier fluid and by the magnitude of the applied current.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Mazlan¹,

Ekreem²,

Olabi³

2008

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The study of their efficiency and effect on the vibration reduction of various rotor systems is reported in [5], [6], [7]. Piccirillo et al [8] dealt with the application of magnetorheological damping devices to suppress impacts and to control the chaotic oscillations in a rotor-bearing system.…”

Section: Introductionmentioning

confidence: 99%

Vibration attenuation of rotating machines by application of magnetorheological dampers to minimize energy losses in the rotor support

Zapoměl

Ferfecki

2016

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract.A frequently used technological solution for minimization of undesirable effects caused by vibration of rotating machines consists in placing damping devices in the rotor supports. The application of magnetorheological squeeze film dampers enables their optimum performance to be achieved in a wide range of rotating speeds by adapting their damping effect to the current operating conditions. The damping force, which is produced by squeezing the layer of magnetorheological oil, can be controlled by changing magnetic flux passing through the lubricant. The force acting between the rotor and its frame is transmitted through the rolling element bearing, the lubricating layer and the squirrel spring. The loading of the bearing produces a time variable friction moment, energy losses, uneven rotor running, and has an influence on the rotor service life and the current fluctuation in electric circuits. The carried out research consisted in the development of a mathematical model of a magnetorheological squeeze film damper, its implementation into the computational models of rotor systems, and in performing the study on the dependence of the energy losses and variation of the friction moment on the damping force and its control. The new and computationally stable mathematical model of a magnetorheological squeeze film damper, its implementation in the computational models of rigid rotors and learning more on the energy losses generated in the rotor supports in dependence on the damping effect are the principal contributions of this paper. The results of the computational simulations prove that a suitable control of the damping force enables the energy losses to be reduced in a wide velocity range.

show abstract

“…It is placed within a wider on-going research project [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

On the optimization of a hybrid tuned mass damper for impulse loading

Salvi¹,

Rizzi²,

Rustighi³

et al. 2015

Smart Mater. Struct.

Self Cite

View full text Add to dashboard Cite

The present paper deals with the optimisation of a hybrid Tuned Mass Damper (TMD) in reducing the transient structural response due to impulse loading. In particular, a unit impulse excitation has been assumed, acting as base displacement, which is a situation that may occur in different real applications. The proposed hybrid Tuned Mass Damper is composed of a previously optimised passive TMD and an added optimised active controller. Such configuration has been conceived in view of reducing both the global and the peak response. Especially on the latter task, the introduction of the active controller brings in a significant contribution. Prior, a Bounded-Input-Bounded-Output (BIBO) stability analysis on the control gains is developed. Different control laws have been investigated, assuming as primary structures, first a single-degree-of-freedom (SDOF) benchmark system and then a multi-degree-of-freedom (MDOF) building, in order to point out the most appropriate control law for the given structural context. In particular, a new control law, based on a linear combination of acceleration and velocity, allowed for remarkable peak response reduction. The achieved dynamic response exhibits a time settling weakly oscillating response, an indication of a stable behaviour, and therefore represents a suitable option for the active controller, in view of various engineering applications.

show abstract

Design of a novel magneto-rheological squeeze-film damper

Cited by 67 publications

References 15 publications

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Vibration attenuation of rotating machines by application of magnetorheological dampers to minimize energy losses in the rotor support

On the optimization of a hybrid tuned mass damper for impulse loading

Contact Info

Product

Resources

About