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26 Sep 2011

Volume 99, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 99, 131101 (2011); http://dx.doi.org/10.1063/1.3641907 (3 pages)

Linas Minkevičius, Vincas Tamošiūnas, Irmantas Kašalynas, Dalius Seliuta, Gintaras Valušis, Alvydas Lisauskas, Sebastian Boppel, Hartmut G. Roskos, and Klaus Köhler
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Use of vehicle magnetic signatures for position estimation

S. Taghvaeeyan and R. Rajamani

Appl. Phys. Lett. 99, 134101 (2011); http://dx.doi.org/10.1063/1.3639274 (3 pages)

Online Publication Date: 26 September 2011

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This letter analyzes the magnetic signatures of cars and investigates the use of anisotropic magnetoresistive sensors to estimate the relative position of a vehicle from its magnetic signature. Theoretical analysis and experimental measurements both show that vehicle magnetic field has a first order inverse relationship with distance at small distances. However, the parameters in the magnetic field-distance relationship vary significantly with the type and size of car. A sensor system consisting of 2 magnetoresistive sensors and an extended Kalman filter can adaptively estimate these parameters in real-time. Experimental results from tests with various vehicles show that the developed sensor system can reliably estimate vehicle distance from magnetic field measurements.
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06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
06.30.Ka Basic electromagnetic quantities
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.55.-w Magnetic instruments and components

A tunable rotational energy harvester for low frequency vibration

Seon-Jun Jang, In-Ho Kim, Hyung-Jo Jung, and Yoon-Pyo Lee

Appl. Phys. Lett. 99, 134102 (2011); http://dx.doi.org/10.1063/1.3644130 (3 pages)

Online Publication Date: 27 September 2011

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The tunable single-degree-of-freedom rotational energy harvester is proposed. The device is the combination of the rotational energy harvester and the suspended weight. Thus, it can harvest the electrical power from the translational base excitation associated with low frequency and large amplitude. Further, its natural frequency can be changeable by manipulating the size of the reel (i.e., geometrical tunability). The characteristics of the proposed device are investigated through numerical simulation and experimental test.
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84.60.-h Direct energy conversion and storage
02.60.-x Numerical approximation and analysis

Managing magnetic force applied to a magnetic device by a rotating dipole field

Arthur W. Mahoney and Jake J. Abbott

Appl. Phys. Lett. 99, 134103 (2011); http://dx.doi.org/10.1063/1.3644021 (3 pages) | Cited 1 time

Online Publication Date: 29 September 2011

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We demonstrate that the attractive magnetic force acting on a rotating magnetic device (e.g., a magnetic microrobot), actuated using a rotating magnet dipole, can be converted into a lateral force by rotating the actuator dipole according to a specific open-loop trajectory. Results show rotating magnetic devices can be rolled and simultaneously pushed along a surface by the lateral force, resulting in significant increase in velocity. We also demonstrate that the lateral force magnitude can be sufficient to levitate the magnetic device. The results apply to rotating magnetic devices of any size provided inertia has a negligible contribution to its dynamics.
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85.70.-w Magnetic devices
07.07.Tw Servo and control equipment; robots
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