On the phenomenon of natural-frequency splitting of a guitar string caused by a magnetic field

2019 ◽  
Vol 145 (3) ◽  
pp. 1750-1750
Author(s):  
Jack Feinberg ◽  
Bingen Yang
Keyword(s):  
Magnetic Field ◽  
Natural Frequency ◽  
Frequency Splitting

scholarly journals Blazhko Effect and Magnetic Field in RR Lyrae

2000 ◽  
Vol 176 ◽  
pp. 318-319
Author(s):  
M. Chadid ◽  
D. Gillet ◽  
K. Kolenberg ◽  
C. Aerts
Keyword(s):  
Magnetic Field ◽  
Pulsation Frequency ◽  
Frequency Splitting ◽  
Rr Lyrae ◽  
Blazhko Effect ◽  
Magnetic Model ◽  
Observational Techniques ◽  
The Magnetic Field

AbstractThe recent detection of a frequency splitting around the pulsation frequency and its harmonics points towards the magnetic model to explain the Blazhko effect. Here we show that it is urgent to confirm with modern observational techniques the existence of the magnetic field in RR Lyrae.

Development and Design of the Dynamic Vibration Absorber Using Magneto-Rheological Elastomer for the Weight and Power Consumption Saving

2019 ◽  
Author(s):  
Osamu Terashima ◽  
Mika Nakata ◽  
Toshihiko Komatsuzaki
Keyword(s):  
Magnetic Field ◽  
Power Consumption ◽  
Natural Frequency ◽  
Damping Ratio ◽  
Wide Band ◽  
Test Results ◽  
Dynamic Vibration Absorber ◽  
Small Power ◽  
Dynamic Absorber ◽  
Magneto Rheological

Abstract In this study, a broadband frequency tunable dynamic absorber was designed and fabricated based on the primary design principle of a mass damper. A magneto-rheological elastomer that can change the relative stiffness when an external magnetic field is applied was used to control the natural frequency of the movable mass of the absorber. A coil to generate the magnetic field was also used as a movable mass to decrease the total weight and to create a constant closed loop of the magnetic force. The hammer impact test results show that the present absorber could change its natural frequency with minimal electric power and had a constant damping ratio. Experimental results of vibration absorbing of an acrylic flat plate show that the proposed absorber could change the natural frequency of the movable mass and reduce the vibration over a wide band by constantly applying the optimum current to the coil in the device with a small power consumption (less than 10 W). Therefore, the proposed absorber works effectively. Further, a technique to determine the electric current applied to the coil automatically based on the phase difference of the vibrational acceleration of the movable mass and the vibrating objective was also presented.

scholarly journals On the implications of the symmetric component of the frequency splitting reported by Duvall, Harvey and Pomerantz

1988 ◽  
Vol 123 ◽  
pp. 175-180
Author(s):  
D.O. Gough ◽  
M.J. Thompson
Keyword(s):  
Magnetic Field ◽  
The Sun ◽  
Frequency Splitting ◽  
Symmetric Component ◽  
Low Latitudes

The component of the frequency splitting of solar five-minute oscillations observed by Duvall, Harvey and Pomerantz that is even in azimuthal degree measures latitudinal and depth variations in the structure of the sun. We indicate how the data hint that there is a shallow perturbation, possibly associated with a magnetic field, that is concentrated at low latitudes.

scholarly journals The effect of toroidal magnetic fields in the overshoot layer on the eigenfrequencies of stellar oscillations

1988 ◽  
Vol 123 ◽  
pp. 167-170
Author(s):  
Gaetano Belvedere
Keyword(s):  
Magnetic Field ◽  
Main Sequence ◽  
Convection Zone ◽  
High Order ◽  
Stable Region ◽  
Flux Tubes ◽  
Frequency Splitting ◽  
Acoustic Modes ◽  
Stellar Oscillations ◽  
The Magnetic Field

The overshoot layer in stellar convection zones is slightly subadiabatic and can be considered as a stable region for storage of magnetic flux. Belvedere, Pidatella and Stix (1986) estimated the size of the overshoot layer and computed the magnetic field strength, beyond which toroidal flux tubes become unstable to buoyancy, for a number of main sequence spectral types ranging from F5 to K0. Here we estimate the relative frequency perturbation of high order acoustic modes due to the presence of a non-oblique axisymmetric magnetic field in the overshoot layer. We find that increases with the advancing spectral type, the predicted frequency splitting being large enough to be detected by observations, at least for the Sun.We conclude that magnetic field induced frequency splitting of high order acoustic modes may well be due to a toroidal field of relatively moderate strength just beneath the bottom of the convection zone.

Analysis of Vibration Characteristics of Magnetorheological Elastomer Sandwich Beam under Non-Homogeneous Magnetic Field

2011 ◽  
Vol 101-102 ◽  
pp. 202-206 ◽  
Author(s):  
Guo Liang Hu ◽  
Miao Guo ◽  
Wei Hua Li
Keyword(s):  
Magnetic Field ◽  
Natural Frequency ◽  
Sandwich Beam ◽  
Homogeneous Magnetic Field ◽  
Experimental Results ◽  
Magnetorheological Elastomer ◽  
Test Rig ◽  
Thin Aluminum ◽  
Set Up ◽  
The Magnetic Field

In this study, the MRE was manufactured, and the sandwich beam was also fabricated by treating with MRE between two thin aluminum layers. The experiment test rig was set up to investigate the vibration response of the MRE sandwich beam under non-homogeneous magnetic field. The experimental results show that the MRE sandwich beam had the capabilities of left shifting first natural frequency when the magnetic field was increased in the activated regions. It is also obvious that the first natural frequency of the MRE sandwich beam decreased as the magnetic field that applied on the beam was moved from the clamped end of the beam to the free end of the beam.

Natural Frequency and Stability Tuning of Cantilevered CNTs Conveying Fluid in Magnetic Field

2016 ◽  
Vol 29 (6) ◽  
pp. 567-576 ◽  
Author(s):  
Lin Wang ◽  
Yuanzhuo Hong ◽  
Huliang Dai ◽  
Qiao Ni
Keyword(s):  
Magnetic Field ◽  
Natural Frequency ◽  
Conveying Fluid

Frequency Analysis of Semi-Active Tuned Magnetic Fluid Column Damper with Two Electromagnets

2014 ◽  
Vol 792 ◽  
pp. 275-280 ◽  
Author(s):  
Kazuki Ikari ◽  
Hideaki Masuda ◽  
Toshiyuki Oyamada ◽  
Tatsuo Sawada
Keyword(s):  
Magnetic Field ◽  
Numerical Analysis ◽  
Numerical Solution ◽  
Natural Frequency ◽  
Frequency Analysis ◽  
Magnetic Fluid ◽  
Momentum Equation ◽  
Experimental Results ◽  
Working Fluid ◽  
Damping Characteristics

A new semi-active tuned liquid column damper (TLCD) that uses magnetic fluid as its working fluid (MF-TLCD) is presented. An MF-TLCD alters the natural frequency of the magnetic fluid column that forms the resident liquid inside the MF-TLCD by applying a magnetic field. We investigated the damping characteristics of an MF-TLCD equipped with two electromagnets, and also the transition of the natural frequency, which is strongly related to the damping performance. The coupled structure-MF-TLCD system was investigated both experimentally and by numerical analysis. The momentum equation of an MF-TLCD and its numerical solution are presented. The numerical results are validated by comparison with experimental results.

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