Low‐frequency harmonic vibration analysis with double‐pulsed addition electronic speckle pattern interferometry

1996 ◽  
Vol 35 (9) ◽  
pp. 2641 ◽  
Author(s):  
Andrew J. Moore
Keyword(s):  
Vibration Analysis ◽  
Speckle Pattern ◽  
Low Frequency ◽  
Harmonic Vibration ◽  
Electronic Speckle Pattern Interferometry ◽  
Frequency Harmonic

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

Dynamic Behaviour Characterization of a Brake Disc by Means of Electronic Speckle Pattern Interferometry Measurements

2005 ◽  
Author(s):  
Alessandro Zanarini
Keyword(s):  
Speckle Pattern ◽  
Low Frequency ◽  
Harmonic Excitation ◽  
Electronic Speckle Pattern Interferometry ◽  
Brake Disc ◽  
Full Field ◽  
Resonance Frequencies ◽  
Displacement Maps ◽  
Bending Modes

A complete experimental approach is here carried out to obtain the dynamic characterization of an automotive brake disc fixed on its grounded knuckle. The operative deflection shapes (ODS) were measured under harmonic excitation in the 1–23 kHz frequency range. Electronic Speckle Pattern Interferometry (ESPI) [1, 2] technology was exploited to measure high spatially defined full field displacement maps at each frequency by means of optical non-contact techniques. The harmonic excitation source was an electrodynamic shaker. The displacement maps acquired depict the dynamic behavior of the brake disc with high accuracy in the whole range, from the global bending modes at low frequency to the arising of small lobes at high frequency, with particular attention paid to the transition over resonance frequencies. Results are reported and discussed in detail.

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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