The simulation of a full-field vibration measurement of cylindrical structures using a continuous scanning LDV technique

2008 ◽  
Author(s):  
C. W. Schwingshackl ◽  
C. Zang ◽  
L. Massei ◽  
D. J. Ewins
Keyword(s):  
Vibration Measurement ◽  
Full Field ◽  
Cylindrical Structures ◽  
Continuous Scanning

scholarly journals FULL-FIELD VIBRATION MEASUREMENT FOR VIBROTHERMOGRAPHY

2008 ◽  
Author(s):  
Jeremy Renshaw ◽  
Stephen D. Holland ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Vibration Measurement ◽  
Full Field

scholarly journals Millimeter-Wave Bat for Mapping and Quantifying Micromotions in Full Field of View

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yuyong Xiong ◽  
Songxu Li ◽  
Changzhan Gu ◽  
Guang Meng ◽  
Zhike Peng
Keyword(s):  
Millimeter Wave ◽  
Laser Scanning ◽  
Wide Spectrum ◽  
Mechanical Vibration ◽  
Phase Evolution ◽  
Field Of View ◽  
Vibration Measurement ◽  
Full Field ◽  
Cluttered Environments ◽  
Visual Sensing

Echolocating bats possess remarkable capability of multitarget spatial localization and micromotion sensing in a full field of view (FFOV) even in cluttered environments. Artificial technologies with such capability are highly desirable for various fields. However, current techniques such as visual sensing and laser scanning suffer from numerous fundamental problems. Here, we develop a bioinspired concept of millimeter-wave (mmWave) full-field micromotion sensing, creating a unique mmWave Bat (“mmWBat”), which can map and quantify tiny motions spanning macroscopic to μm length scales of full-field targets simultaneously and accurately. In mmWBat, we show that the micromotions can be measured via the interferometric phase evolution tracking from range-angle joint dimension, integrating with full-field localization and tricky clutter elimination. With our approach, we demonstrate the capacity to solve challenges in three disparate applications: multiperson vital sign monitoring, full-field mechanical vibration measurement, and multiple sound source localization and reconstruction (radiofrequency microphone). Our work could potentially revolutionize full-field micromotion monitoring in a wide spectrum of applications, while may inspiring novel biomimetic wireless sensing systems.

Laser Doppler Vibrometry for Structural Dynamic Characterization of Rotating Machinery

2013 ◽  
Vol 415 ◽  
pp. 538-543
Author(s):  
Paolo Castellini ◽  
Milena Martarelli ◽  
Enrico Primo Tomasini
Keyword(s):  
Laser Beam ◽  
Vibrational Analysis ◽  
Laser Doppler ◽  
Structural Vibration ◽  
Vibration Velocity ◽  
Testing Time ◽  
Laser Doppler Vibrometry ◽  
Structural Dynamic ◽  
Full Field ◽  
Continuous Scanning

Laser Doppler Vibrometry (LDV) is a well established technique able to accurately measure vibration velocity of any kind of structure in remote, i.e. non-intrusive way, this allowing to overcome the problem of mass loading, typical of contact sensors as accelerometers and strain-gauges, which has strong influence in case of lightweight structures. Moreover, the possibility of driving automatically the laser beam, by means of moving mirrors controlled with galvanometer servo-actuators, permits to perform scanning measurements at different locations with high spatial resolution and reduced testing time and easily measure the operational deflection shapes (ODS) of the scanned surface. The exploitation of the moving mirrors has allowed to drive the laser beam in a continuous way making it to scan continuously over the structure surface and cover it completely. This way of operation, named Continuous Scanning LDV, permits to perform full-field measurements, the LDV output carrying simultaneously the time-and spatial-dependent information related to the structural vibration. A complementary strategy making use of the LDV coupled with moving mirrors is the so called Tracking LDV, where the laser beam is driven to follow a moving object whose trajectory must be known a priori or measured during operation (e.g. via an encoder in the case of rotating structures). In this paper some applications of the Tracking Laser Doppler Vibrometry (TLDV) and Continuous Scanning Laser Doppler Vibrometry (CSLDV) will be described they concerning, specifically modal and vibrational analysis of rotating structures.

Full-Field Laser Vibrometer for Instantaneous Vibration Measurement and Non-Destructive Inspection

2010 ◽  
Vol 437 ◽  
pp. 407-411 ◽  
Author(s):  
James M. Kilpatrick ◽  
Vladimir B. Markov
Keyword(s):  
High Speed ◽  
Fiber Optic ◽  
Speckle Pattern ◽  
Vibration Measurement ◽  
Electronic Speckle Pattern Interferometry ◽  
Laser Vibrometer ◽  
Full Field ◽  
The Matrix ◽  
Interferometric Sensor ◽  
Non Destructive

We describe a system for real-time, full-field vibrometry, incorporating features of high-speed electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV). Based on a 2D interferometric sensor array, comprising 16×16 parallel illumination and detection channels, the matrix laser vibrometer (MLV), captures full-field data instantaneously, without beam scanning. The instrument design draws on the advantages of scale offered by modern telecommunications fiber optic and digital electronics. The resulting architecture, comprising a compact measurement probe linked by fiber optic umbilical to a remote electronics unit, facilitates practical application to the full-field study of transient vibrations and rapid non-destructive inspection of composite materials.

Finite element model updating from full-field vibration measurement using digital image correlation

2011 ◽  
Vol 330 (8) ◽  
pp. 1599-1620 ◽  
Author(s):  
Weizhuo Wang ◽  
John E. Mottershead ◽  
Alexander Ihle ◽  
Thorsten Siebert ◽  
Hans Reinhard Schubach
Keyword(s):  
Finite Element ◽  
Digital Image Correlation ◽  
Finite Element Model ◽  
Digital Image ◽  
Model Updating ◽  
Element Model ◽  
Image Correlation ◽  
Vibration Measurement ◽  
Finite Element Model Updating ◽  
Full Field
Sign in / Sign up

Export Citation Format

Share Document