Fractal Properties of the Bouncing-Ball Dynamics

1990 ◽  
pp. 125-131 ◽  
Author(s):  
Heikki M. Isomäki
Keyword(s):  
Bouncing Ball ◽  
Fractal Properties

Fractal properties of neurophysiologic signals in rat somatosensory cortex

2005 ◽  
Vol 25 (1_suppl) ◽  
pp. S186-S186
Author(s):  
Peter Herman ◽  
Shaun A Wahab ◽  
Andras Eke ◽  
Fahmeed Hyder
Keyword(s):  
Somatosensory Cortex ◽  
Fractal Properties ◽  
Rat Somatosensory Cortex

scholarly journals A Self-Powered and Highly Accurate Vibration Sensor Based on Bouncing-Ball Triboelectric Nanogenerator for Intelligent Ship Machinery Monitoring

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 218
Author(s):  
Taili Du ◽  
Xusheng Zuo ◽  
Fangyang Dong ◽  
Shunqi Li ◽  
Anaeli Elibariki Mtui ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Work Conditions ◽  
Copper Electrode ◽  
Vibration Sensor ◽  
High Signal ◽  
Triboelectric Nanogenerator ◽  
Vibration Exciter ◽  
Bouncing Ball ◽  
3D Printed ◽  
Self Powered

With the development of intelligent ship, types of advanced sensors are in great demand for monitoring the work conditions of ship machinery. In the present work, a self-powered and highly accurate vibration sensor based on bouncing-ball triboelectric nanogenerator (BB-TENG) is proposed and investigated. The BB-TENG sensor consists of two copper electrode layers and one 3D-printed frame filled with polytetrafluoroethylene (PTFE) balls. When the sensor is installed on a vibration exciter, the PTFE balls will continuously bounce between the two electrodes, generating a periodically fluctuating electrical signals whose frequency can be easily measured through fast Fourier transform. Experiments have demonstrated that the BB-TENG sensor has a high signal-to-noise ratio of 34.5 dB with mean error less than 0.05% at the vibration frequency of 10 Hz to 50 Hz which covers the most vibration range of the machinery on ship. In addition, the BB-TENG can power 30 LEDs and a temperature sensor by converting vibration energy into electricity. Therefore, the BB-TENG sensor can be utilized as a self-powered and highly accurate vibration sensor for condition monitoring of intelligent ship machinery.

Pattern analysis of fractal properties in multilayer systems with metamaterials

2016 ◽  
Vol 24 (1) ◽  
pp. 17-21 ◽  
Author(s):  
M. G. Davydova ◽  
P. V. Korolenko ◽  
S. B. Ryzhikov ◽  
Yu. V. Ryzhikova
Keyword(s):  
Pattern Analysis ◽  
Multilayer Systems ◽  
Fractal Properties

Fractal properties of polymer crystals

1989 ◽  
Vol 90 (3) ◽  
pp. 2063-2067 ◽  
Author(s):  
Tetsuya Ogawa ◽  
Satoru Miyashita ◽  
Hideki Miyaji ◽  
Shoji Suehiro ◽  
Hisao Hayashi
Keyword(s):  
Polymer Crystals ◽  
Fractal Properties
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