Mode shape separation in stroboscopic and double-pulse hologram vibration analysis

2003 ◽  
Author(s):  
Mikhail E. Gusev ◽  
Igor V. Alexeenko ◽  
G. Pedrini ◽  
Hans J. Tiziani
Keyword(s):  
Mode Shape ◽  
Vibration Analysis ◽  
Double Pulse

scholarly journals Vibration Analysis of Membrane by Time Average In-Line Digital Holographic Interferometry

2006 ◽  
Vol 326-328 ◽  
pp. 23-26
Author(s):  
Vijay Raj Singh ◽  
Anand Krishna Asundi
Keyword(s):  
Mode Shape ◽  
Holographic Interferometry ◽  
Vibration Analysis ◽  
Average Method ◽  
Vibration Amplitude ◽  
Digital Holography ◽  
Experimental Results ◽  
Time Average ◽  
Reconstructed Wave

In this paper, in-line digital holography is combined with time average method and applied for vibration analysis of an aluminum membrane. The numerically reconstructed wave from time average holograms contains information of mode shape and mean deformation of the vibrating objects. At lower amplitudes of vibration only the deformation fringes are observed and as the amplitude is increases, the Bessel fringes representing the time average vibration amplitude also become visible. Experimental results for a 10mm size membrane are presented.

Vibration Analysis of a Multi-Span Continuous Beam with Cracks

2012 ◽  
Vol 256-259 ◽  
pp. 964-972
Author(s):  
Han Bing Liu ◽  
Huu Hung Nguyen ◽  
Yi Ming Xiang
Keyword(s):  
Damage Detection ◽  
Mode Shape ◽  
Arbitrary Number ◽  
Vibration Analysis ◽  
Vibration Mode ◽  
Superposition Method ◽  
Vibration Frequencies ◽  
Continuous Beam ◽  
Beam Structure ◽  
Mode Superposition Method

This paper deals with dynamic analysis of a multi-span continuous beam with an arbitrary number of cracks. This problem is solved by a hybrid analytical/ numerical method that is the basis for applying to a method of damage detection in the multi-span continuous beam later. In this paper, we calculate in detail about vibration frequencies, vibration mode shape of beam structure with cracks. The proposed method is the method that improved the transfer matrix method combined with the mode-superposition method. Only need to use two unknowns, this method can solve the problem of multi-span continuous beam with an arbitrary number of cracks. Calculation cases of beam with cracks and beam without cracks are compared with previous studies.

Double-pulse digital speckle pattern interferometry for vibration analysis

2014 ◽  
Author(s):  
Dazhi Zhang ◽  
Jingfeng Xue ◽  
Lu Chen ◽  
Juying Wen ◽  
Jingjing Wang
Keyword(s):  
Vibration Analysis ◽  
Speckle Pattern ◽  
Double Pulse ◽  
Digital Speckle Pattern Interferometry ◽  
Digital Speckle

Numerical Investigation on Added Mass of Circle Membrane Vibrating in Still Air

2011 ◽  
Vol 374-377 ◽  
pp. 1770-1773 ◽  
Author(s):  
Yi Zhou ◽  
Yuan Qi Li ◽  
Zu Yan Shen
Keyword(s):  
Wave Equation ◽  
Numerical Analysis ◽  
Mode Shape ◽  
Vibration Analysis ◽  
Added Mass ◽  
Mode Shapes ◽  
Circular Membrane ◽  
Membrane Structures ◽  
Dipole Configuration ◽  
Test Result

The added mass has significant effect on the vibration of the membrane structures, which can not be ignored during their vibration analysis. The added mass is significant and depends on the mode shape. The solution of the wave equation can derive the mode shapes of the circular membrane. The added mass of the circular membrane is investigated by Numerical analysis, both in Fluent and in the theory of dipole configuration. An existing test result is employed to verify the proposed methods.

scholarly journals Sophisticated finite strip for vibration analysis of a rotating cylindrical shell

2018 ◽  
Vol 148 ◽  
pp. 07001
Author(s):  
Ivo Senjanović ◽  
Ivan Ćatipović ◽  
Neven Alujević ◽  
Nikola Vladimir ◽  
Damjan Čakmak
Keyword(s):  
Mode Shape ◽  
Vibration Analysis ◽  
Degrees Of Freedom ◽  
Free Vibration Analysis ◽  
Axial Direction ◽  
Shape Functions ◽  
Axial Mode ◽  
Beam Shape ◽  
Finite Strip ◽  
Rotating Cylindrical Shell

In this article a two-node finite strip with eight degrees of freedom for free vibration analysis of pre-stressed rotating cylindrical shells is formulated. The circumferential mode shape profiles are described exactly using trigonometric functions. The axial mode shape profiles are approximated by bar and beam shape functions for membrane and bending displacements, respectively. In this way a semi-analytical formulation is facilitated so that the discretization is required only in the axial direction. The developed finite strip is validated by comparisons with analytical results. An excellent agreement is observed both for stationary and rotating shells.

Vibration Analysis of an Inflatable Torus Based on Mode Shape

AIAA Journal ◽  
2013 ◽  
Vol 51 (6) ◽  
pp. 1526-1532 ◽  
Author(s):  
S. C. Gajbhiye ◽  
S. H. Upadhyay ◽  
S. P. Harsha
Keyword(s):  
Mode Shape ◽  
Vibration Analysis
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