Magnetic fields influence on sensors with electrical output under sinusoidal excitations

Medina, Nieves; Vicente, José Miguel Gómez de; Robles, Jorge Luis

doi:10.21014/acta_imeko.v5i1.301

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…The value of k 1 depends on geometry and size of the all magnets. The distance between the moving magnet (with sensor) and the shaker was 0.15 m. It has been estimated based on our own tests and suggestions from [38].…”

Section: Methodsmentioning

confidence: 99%

Theoretical and Experimental Investigations of a Pseudo-Magnetic Levitation System for Energy Harvesting

Kęcik

Mitura

2020

Sensors

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The paper presents an analytical, numerical and experimental analysis of the special designed system for energy harvesting. The harvester system consists of two identical magnets rigidly mounted to the tube’s end. Between them, a third magnet is free to magnetically levitate (pseudo-levitate) due to the proper magnet polarity. The behaviour of the harvester is significantly complicated by a electromechanical coupling. It causes resonance curves to have a distorted shape and a new solution from which the recovered energy is higher is observed. The Harmonic Balance Method (HBM) is used to approximately describe the response and stability of the mechanical and electrical systems. The analytical results are verified by a numerical path following (continuation) method and experiment test with use of a shaker. The influence of harvester parameters on the system response and energy recovery near a main resonance is studied in detail.

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Section: Methodsmentioning

confidence: 99%

Theoretical and Experimental Investigations of a Pseudo-Magnetic Levitation System for Energy Harvesting

Kęcik

Mitura

2020

Sensors

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Design and Evaluation of a Low-Cost Electromechanical System to Test Dynamic Performance of Force Sensors at Low Frequencies

et al. 2022

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Piezoresistive or piezoelectric force sensors are widely available today. These sensors are preferred to loadcells because of their extremely reduced size, slimness, and low cost, which allow their easy inclusion in a large variety of devices including wearables. In particular, many applications are devoted to monitoring human body movements, such as those related to breathing, muscle contraction, walking, etc. However, such sensors offer variable performance, and they need to be individually calibrated and tested to ensure accurate measurements. An automated electromechanical system that allows simple mechanical tests of force sensors is proposed. The system by means of an electrical motor; a gear box; a connecting rod-crank mechanism; two pistons, and a coupling spring between them, impress sinusoidal axial forces onto the sensor under test. The system is designed as modular so that it can be customized: the force range to which the sensor is subjected, the frequency range, and the coupler with the sensor can be changed to resemble the actual application context. The actual force (read from a loadcell coupled to the sensor under test), a piston displacement, and the sensor output are simultaneously recorded. The electromechanical system generates nearly pure sinusoidal stresses at varying low frequencies (mean total harmonic distortion of 2.77%). The energy dissipated for a single stress cycle was 3.62 gf mm on average. The developed system was used to test a Force Sensitive Resistor (FSR)-based sensor and a piezoelectric (PZT) sensor. The tests revealed significant differences from the actual force values (particularly at very low frequencies), output drifts of the FSR sensor in measurements, and non-linear behaviors. The system was found to be able to provide dynamic performances, accurate calibration, and non-linear behavior of the individual sensor.

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Magnetic fields influence on sensors with electrical output under sinusoidal excitations

Cited by 2 publications

References 2 publications

Theoretical and Experimental Investigations of a Pseudo-Magnetic Levitation System for Energy Harvesting

Theoretical and Experimental Investigations of a Pseudo-Magnetic Levitation System for Energy Harvesting

Design and Evaluation of a Low-Cost Electromechanical System to Test Dynamic Performance of Force Sensors at Low Frequencies

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