Studies on the effects of low frequency horizontal vibration to the human body

This article presents the modeling, fabrication, and testing of liquid encapsulated energy harvester using polyvinylidene fluoride electrets. Unlike harvesters reported in previous literature, this liquid encapsulated energy harvester uses flowing liquid rather than conventional resonating structures to induce variable capacitance and is more suitable for low-frequency applications. Prototypes injected with three types of liquid ( N-methyl-2-pyrrolidone, N, N-dimethylformamide, and glycerin) are tested in horizontal vibration and rotary motion mode, respectively. The results show that N, N-dimethylformamide–injected prototypes display the most desirable performance in horizontal vibration testing at 1–10 Hz due to high relative permittivity and low viscosity, with maximum output voltage of 2.32 V and power of 0.18 µW at 10 Hz. Glycerin-injected prototypes perform best at 0.1–1 Hz rotation due to effective movement and highest permittivity, with maximum output voltage of 11.46 V and power of 2.19 µW at 1 Hz.

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Ride Comfort Evaluation of Horizontal Vibration in Tractor-Trailer Considering Human Body Motion of Driver

10.4271/2013-01-0992 ◽

2013 ◽

Cited By ~ 1

Author(s):

Yuichiro Hirose ◽

Mitsuru Enomoto ◽

Takashi Sasaki ◽

Eiichi Yasuda ◽

Masatoshi Hada

Keyword(s):

Human Body ◽

Ride Comfort ◽

Body Motion ◽

Horizontal Vibration ◽

Comfort Evaluation ◽

Ride Comfort Evaluation

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Computation of currents induced by ELF electric fields in anisotropic human tissues using the Finite Integration Technique (FIT)

Advances in Radio Science ◽

10.5194/ars-3-227-2005 ◽

2005 ◽

Vol 3 ◽

pp. 227-231 ◽

Cited By ~ 4

Author(s):

V. C. Motrescu ◽

U. van Rienen

Keyword(s):

Dielectric Properties ◽

Electromagnetic Fields ◽

Electric Fields ◽

Human Body ◽

Low Frequency ◽

Integration Technique ◽

Human Body Model ◽

Body Model ◽

Finite Integration Technique ◽

Muscle Tissues

Abstract. In the recent years, the task of estimating the currents induced within the human body by environmental electromagnetic fields has received increased attention from scientists around the world. While important progress was made in this direction, the unpredictable behaviour of living biological tissue made it difficult to quantify its reaction to electromagnetic fields and has kept the problem open. A successful alternative to the very difficult one of performing measurements is that of computing the fields within a human body model using numerical methods implemented in a software code. One of the difficulties is represented by the fact that some tissue types exhibit an anisotropic character with respect to their dielectric properties. Our work consists of computing currents induced by extremely low frequency (ELF) electric fields in anisotropic muscle tissues using in this respect, a human body model extended with muscle fibre orientations as well as an extended version of the Finite Integration Technique (FIT) able to compute fully anisotropic dielectric properties.

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