Speckle photo-electromotive force for large transverse vibration amplitude measurement

2004 ◽  
Author(s):  
L. Mosquera ◽  
Jaime Frejlich
Keyword(s):  
Transverse Vibration ◽  
Electromotive Force ◽  
Vibration Amplitude ◽  
Amplitude Measurement

Monitoring Offshore Pipelines Using Forced Transverse Vibration: Data Analysis

1995 ◽  
Author(s):  
Hugh E. M. Hunt
Keyword(s):  
Fluid Flow ◽  
Data Analysis ◽  
Transverse Vibration ◽  
Vibration Amplitude ◽  
Support Condition ◽  
Offshore Pipelines ◽  
Vibration Data ◽  
Wavelet Methods

Abstract Vibration methods are used to identify faults, such as spanning and loss of cover, in long off-shore pipelines. A pipeline ‘pig’, propelled by fluid flow, generates transverse vibration in the pipeline and the measured vibration amplitude reflects the nature of the support condition. Large quantities of vibration data are collected and analysed by Fourier and wavelet methods.

The Use of Vibration as a Means of Industrial Drive

1947 ◽  
Vol 157 (1) ◽  
pp. 20-31
Author(s):  
C. A. M. Thornton
Keyword(s):  
Natural Frequency ◽  
Transverse Vibration ◽  
Vibration Amplitude ◽  
Electrical Excitation ◽  
Advantages And Disadvantages ◽  
Transverse Vibrations ◽  
Industrial Drive ◽  
The Subject ◽  
And Control

The application of vibration as a means of industrial drive has been considerably developed in the last twenty years. Starting from the obvious application of screening, it has been extended to conveying, heat interchanging, consolidation of material in packages to reduce shipping space, keeping material “fluid” in hoppers and chutes, hammering, etc. The paper discusses that part of the subject involved in the production and control of the vibration by mechanical or electrical means under all conditions of load. Formulae are developed for calculation of spring strength and for the calculation of the spring dimensions, and for the avoidance of spring fatigue. The various methods of electrical excitation are compared, and the relative advantages and disadvantages are discussed. The desirable instrument equipment is described, including the remote indication of vibration amplitude. A method is outlined by which it is claimed that vibration can be maintained constant at all loads and at any desired frequency. The testing of vibrating drives at the manufacturer's works and on site is discussed. In an Appendix to the paper the problem of transverse vibrations in long vibrating conveyors is treated mathematically, and a formula is developed for the natural frequency of transverse vibration of a conveyor of any uniform section and of any length.

Improved holographic method for vibration amplitude measurement from nano to microscale

2014 ◽  
Author(s):  
Pavel Psota ◽  
Vít Lédl ◽  
Roman Doleček ◽  
Jan Václavík ◽  
Václav Kopecký
Keyword(s):  
Vibration Amplitude ◽  
Holographic Method ◽  
Amplitude Measurement

New possibilities for vibration-amplitude measurement by heterodyne laser vibrometer

2000 ◽  
Vol 43 (2) ◽  
pp. 140-143
Author(s):  
V. G. Atavin ◽  
A. A. Mokhnatov ◽  
Yu. V. Khudyakov
Keyword(s):  
Vibration Amplitude ◽  
Laser Vibrometer ◽  
Amplitude Measurement

scholarly journals Comparative Analysis of Longitudinal and Transverse Vibration Characteristics of Ocean Mining Pipe

2021 ◽  
Vol 2021 ◽  
pp. 1-25
Author(s):  
Qiang Liu ◽  
Lin-jing Xiao
Keyword(s):  
Working Conditions ◽  
Transverse Vibration ◽  
Vibration Amplitude ◽  
Longitudinal Vibration ◽  
Large Diameter ◽  
Vibration Intensity ◽  
Oscillation Phenomenon ◽  
Irregular Motion ◽  
Vibration Responses ◽  
Ocean Mining

In this paper, the 5000 m mining pipe is taken as the research object, and the transverse and longitudinal vibration laws of the pipe under different working conditions are analyzed. Based on the finite element method (FEM), the pipe is discretized and calculated by the Wilson-θ Wilson - θ integral method; finally, the corresponding vibration laws of the mining pipe are obtained. The research shows that the mining pipe vibration responses are irregular motion, with the obvious oscillation phenomenon, and the overall vibration trend decreases first and then increases from the top to the bottom; the maximum vibration response occurs at the pipe top. Under the same working conditions, increasing the towing velocity will decrease the overall longitudinal vibration amplitude and increase the overall transverse vibration amplitude. While the ore bin weight will increase the longitudinal vibration amplitude and decrease the transverse vibration amplitude, increasing the mining pipe large diameter stepped section length and damping will decrease the longitudinal and transverse vibration simultaneously. When the towing velocity is between 0–2.8 m/s, the longitudinal vibration intensity is large, which is the main vibration mode. When the towing velocity is 2.8 m/s, the critical point is reached, and the longitudinal and transverse vibrations have the same intensity. When the towing velocity is greater than 2.8 m/s, the transverse vibration intensity is gradually greater than the longitudinal vibration intensity; at this time, the control of the transverse vibration should be appropriately increased.

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