scholarly journals Monocular vision-based low-frequency vibration calibration method with correction of the guideway bending in a long-stroke shaker

2019 ◽  
Vol 27 (11) ◽  
pp. 15968
Author(s):  
Ming Yang ◽  
Ying Wang ◽  
Chenguang Cai ◽  
Zhihua Liu ◽  
Haijiang Zhu ◽  
...  
Keyword(s):  
Low Frequency ◽  
Calibration Method ◽  
Monocular Vision ◽  
Low Frequency Vibration ◽  
Long Stroke

scholarly journals Monocular Vision-Based Earth’s Graviation Method Used for Low-Frequency Vibration Calibration

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 129087-129093
Author(s):  
Ming Yang ◽  
Haijiang Zhu ◽  
Chenguang Cai ◽  
Ying Wang ◽  
Zhihua Liu ◽  
...  
Keyword(s):  
Low Frequency ◽  
Monocular Vision ◽  
Low Frequency Vibration

scholarly journals Rectangular Closed Double Magnetic Circuit Offering Ultra-Long Stroke for Ultra-Low-Frequency Vibration Exciter

2020 ◽  
Vol 10 (17) ◽  
pp. 6118
Author(s):  
Junning Cui ◽  
Wei Li ◽  
Xingyuan Bian ◽  
Zhangqiang He ◽  
Limin Zou
Keyword(s):  
High Performance ◽  
Magnetic Circuit ◽  
Harmonic Distortion ◽  
Low Frequency ◽  
Fem Analysis ◽  
Magnetic Flux Density ◽  
Vibration Exciter ◽  
Low Frequency Vibration ◽  
Lumped Parameter ◽  
Long Stroke

High-performance magnetic circuit offering uniform magnetic flux density (MFD) along ultra-long stroke is the key to develop a vibration exciter for ultra-low-frequency (ULF) vibration calibration. In this paper, a rectangular closed double magnetic circuit (RCDMC) offering ultra-long stroke up to 1.2 m is modeled and optimized. In order to overcome the modeling difficulty arising from the long stroke, a high-accuracy theoretical model is established taking advantage of the structural symmetry of the RCDMC through lumped parameter magnetic equivalent circuit method. Matrix equations are derived based on Kirchhoff’s law and solved by iteration calculation to deal with the strong nonlinear characteristics of the yoke material. The deviations between the model and finite element method (FEM) analysis results are less than 1% for non-saturated yokes and ~10% for saturated yokes. Theoretically, an MFD up to 122 mT and an acceleration waveform harmonic distortion (AWHD) as low as 0.45% are achieved through model-based optimization. Experiments are carried out using an RCDMC prototype assembled in a horizontal vibration exciter. The experimental results show that an MFD of 102 mT and an AWHD of 0.27% along 1.2 m stroke are achieved, making the proposed RCDMC a solution for ULF vibration exciter.

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.

scholarly journals Influence of low-frequency vibration in Die Sinking EDM: a review

2021 ◽  
Vol 1104 (1) ◽  
pp. 012010
Author(s):  
Laxmi Devi ◽  
Kamlesh Paswan ◽  
Somnath Chattopadhyaya ◽  
Alokesh Pramanik
Keyword(s):  
Low Frequency ◽  
Low Frequency Vibration
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