Distributed Optical Fiber Low-Frequency Vibration Detecting Using Cross-Correlation Spectrum Analysis

2020 ◽  
Vol 38 (23) ◽  
pp. 6664-6670
Author(s):  
Dong Wang ◽  
Jie Zou ◽  
Yu Wang ◽  
Baoquan Jin ◽  
Qing Bai ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Spectrum Analysis ◽  
Cross Correlation ◽  
Low Frequency ◽  
Low Frequency Vibration ◽  
Correlation Spectrum ◽  
Distributed Optical Fiber

Distributed optical fiber vibration sensor using generalized cross-correlation algorithm

Measurement ◽  
2019 ◽  
Vol 144 ◽  
pp. 58-66 ◽  
Author(s):  
Yu Wang ◽  
Peihong Li ◽  
Jianguo Zhang ◽  
Xin Liu ◽  
Qing Bai ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Cross Correlation ◽  
Vibration Sensor ◽  
Correlation Algorithm ◽  
Distributed Optical Fiber

The Experimental and Analysis of Automobile Brake Groan

2013 ◽  
Vol 409-410 ◽  
pp. 1492-1495
Author(s):  
Xian Jie Meng ◽  
Ren Fei Yuan
Keyword(s):  
Power Spectrum ◽  
Coordinate System ◽  
Spectrum Analysis ◽  
Low Frequency ◽  
Experimental Spectrum ◽  
Power Spectrum Analysis ◽  
Coherence Analysis ◽  
Vehicle Speed ◽  
Low Frequency Vibration ◽  
Brake Pressure

To seize the feature of brake groan and the relay route of the vibration and noise,an experiment is done on brake groan and all signals are done the auto-power spectrum analysis and coherence analysis. The result of experiment and analysis shows that brake groan is a low frequency vibration and noise happened under the low vehicle speed and low brake pressure, the noise of the interior of cab has good coherence with the noise beside the brake caliper when the brake groan takes place, and also with the vibration of tangent orientation of brake caliper, Y orientation of vehicle coordinate system on arm of cross pattern and Z orientation on the top dead center of suspension. The coherence analysis roughly illustrates that the relay route of the brake groan have two paths, the vibration and noise are transferred from the arm of cross pattern and suspension to automobile chassis and body Keywords: brake groan, experimental,spectrum analysis,relay route

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

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