Three-Dimensional Vibration Analysis Using Electronic Speckle Pattern Interferometry (ESPI)

1988 ◽  
Author(s):  
M. C. Shellabear ◽  
J . R. Tyrer
Keyword(s):  
Vibration Analysis ◽  
Speckle Pattern ◽  
Three Dimensional ◽  
Electronic Speckle Pattern Interferometry

Application of ESPI in the Vibration Analysis of Turbine Blading

1995 ◽  
Author(s):  
Robert X. Wang ◽  
Graham M. Chapman
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Vibration Analysis ◽  
Speckle Pattern ◽  
Vibration Measurement ◽  
Simplified Model ◽  
Electronic Speckle Pattern Interferometry ◽  
Coupled Modes ◽  
Element Analysis ◽  
Turbine Blading

Abstract This paper reports on the application of Electronic Speckle Pattern Interferometry (ESPI) technique in vibration measurement of turbine blading. Using the time-averaged mode of ESPI, the first six modes of a turbocharger blade with airfoil profile were identified. The effect of the complicated profile of the blade was established by studying simplified model blades. Coupled modes were identified and successfully separated. Experimental results are compared with those obtained using finite element analysis.

Cantilevered Plate Vibration Analysis Based on Electronic Speckle Pattern Interferometry and Digital Shearing Speckle Pattern Interferometry

2019 ◽  
Vol 39 (4) ◽  
pp. 0403001
Author(s):  
马银行 Ma Yinhang ◽  
蒋汉阳 Jiang Hanyang ◽  
戴美玲 Dai Meiling ◽  
代祥俊 Dai Xiangjun ◽  
杨福俊 Yang Fujun
Keyword(s):  
Vibration Analysis ◽  
Speckle Pattern ◽  
Electronic Speckle Pattern Interferometry ◽  
Plate Vibration ◽  
Cantilevered Plate

Developments In Electronic Speckle Pattern Interferometry For Automotive Vibration Analysis.

1988 ◽  
Author(s):  
Jeremy C. Davies ◽  
Clive H. Buckberry ◽  
Julian D. C. Jones ◽  
Chris N. Pannell
Keyword(s):  
Vibration Analysis ◽  
Speckle Pattern ◽  
Electronic Speckle Pattern Interferometry

Electronic Speckle Pattern Interferometry of the Vibrating Larynx

1995 ◽  
Vol 104 (1) ◽  
pp. 5-12 ◽  
Author(s):  
Glendon M. Gardner ◽  
Michelle Conerty ◽  
James Castracane ◽  
Steven M. Parnes
Keyword(s):  
Real Time ◽  
Quantitative Research ◽  
Speckle Pattern ◽  
Three Dimensional ◽  
Vocal Folds ◽  
Digital Data ◽  
Electronic Speckle Pattern Interferometry ◽  
Clinical Tool ◽  
Digital Hardware ◽  
Laser Holography

Laser holography is a technique that creates a three-dimensional image of a static object. This technique can be applied to the analysis of vibrating structures. Electronic speckle pattern interferometry uses a laser for illumination of the vibrating object and solid state detectors and digital hardware technology for capturing and processing the image in real time. This was performed on a human cadaver larynx and is the first time an interferogram of vibrating vocal cords has ever been obtained. Dark and bright interference fringes are seen that represent the vibratory motion of the vocal folds. These are presented in still photos as well as real-time on videotape. This method can provide advantages over current techniques of laryngeal study: it is sensitive to motion in the vertical dimension, and the digital data can be quantitatively analyzed. Application of this technique to study the larynx should eventually be a valuable clinical tool and provide quantitative research data.

Vibration Control in Turbomachinery Blading Using Lacing Wires

1995 ◽  
Author(s):  
Robert X. Wang ◽  
Graham M. Chapman
Keyword(s):  
Finite Element ◽  
Vibration Control ◽  
Dynamic Characteristics ◽  
Vibration Analysis ◽  
Finite Element Modelling ◽  
Speckle Pattern ◽  
Electronic Speckle Pattern Interferometry ◽  
Element Modelling ◽  
Wire Vibration ◽  
Theoretical Results

Abstract In turbomachinery practice the use of inter-blade coupling is an accepted procedure. The use of lacing wires in highly stressed short blading introduces damping and also modifies the vibration characteristics of the blading. This paper reports on a study into the dynamic characteristics of single blades with a lacing wire. Vibration analysis is carried out using finite element modelling. The theoretical results are verified using Electronic Speckle Pattern Interferometry technique (ESPI).

scholarly journals Digital Double-Pulse Holographic Interferometry for Vibration Analysis

1996 ◽  
Vol 3 (2) ◽  
pp. 117-125
Author(s):  
H.J. Tiziani ◽  
G. Pedrini
Keyword(s):  
Holographic Interferometry ◽  
Vibration Analysis ◽  
Speckle Pattern ◽  
Ccd Camera ◽  
Image Plane ◽  
Speckle Interferometry ◽  
Electronic Speckle Pattern Interferometry ◽  
3 Dimensional ◽  
Digital Reconstruction ◽  
Fitting Method

Different arrangements for double-pulsed holographic and speckle interferometry for vibration analysis will be described. Experimental results obtained with films (classical holographic interferometry) and CCD cameras (digital holographic interferometry) as storage materials are presented. In digital holography, two separate holograms of an object under test are recorded within a few microseconds using a CCD camera and are stored in a frame grabber. The phases of the two reconstructed wave fields are calculated from the complex amplitudes. The deformation is obtained from the phase difference. In the case of electronic speckle pattern interferometry (or image plane hologram), the phase can be calculated by using the sinusoid-fitting method. In the case of digital holographic interferometry, the phase is obtained by digital reconstruction of the complex amplitudes of the wave fronts. Using three directions of illumination and one direction of observation, all the information necessary for the reconstruction of the 3-dimensional deformation vector can be recorded at the same time. Applications of the method for measuring rotating objects are discussed where a derotator needs to be used.

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