Short Course - AIVELA_2018

13th Intl CONFERENCE on VIBRATION MEASUREMENTS
by LASER and NONCONTACT TECHNIQUES & SHORT COURSE
Ancona, 19 - 22 June 2018
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SHORT COURSE

A one-day Tutorial Course is organised the day before the Conference to provide the fundamentals of vibration measurements by optical techniques and offer hands-on experience on the most recent instrumentation.
For a more complete training, the programme will include morning theoretical lectures and afternoon hands-on lab sessions, organised by the Group of Mechanical Measurements, Polytechnic University of Marches in collaboration with GOM GmbH and Polytec GmbH.

COURSE LECTURES
"RECENT INNOVATIONS in LASER-DOPPLER-VIBROMETRY"
Prof. Christian Rembe, Clausthal University of Technology, Germany

Although Laser-Doppler-Vibrometry LDV is already well established for vibration analysis, recent developments have advanced the potential of LDV substantially. First, multipoint vibrometers allow the measurement at multiple points simultaneously in order to study deflection shapes and resonance frequencies in mechanical systems during warm-up, in systems with statistic excitation by friction, or in biological self-excited systems (e.g. vibrations of the cardiovascular system). Second, the detection of Doppler-shifted light of a single laser spot from different directions simultaneously enables 3D laser vibrometry on tiny mechanical structures like MEMS with picometer
resolution and high-speed A/D converters make possible vibration measurements up to the GHz range.
The lecture gives a deep insight into the technology of these recent innovations and discusses their impact on some specific vibration-analysis applications. In addition, the future challenges for LDV as, for example, speckle-insensitive laser-Doppler vibrometers are discussed.
 
"HOW to OBTAIN the BEST from YOUR VISION-BASED 3D DYNAMIC MEASUREMENTS"
Prof. Emanuele Zappa, Polytechnic of Milan, Italy

The lecture will focus on image-based vibration measurements and will provide guidelines for choosing the most appropriate technique for each application condition. Digital Image Correlation (DIC) will also be analysed to understand how it is possible to estimate the 3D displacement and strain fields. The strengths and weaknesses of vision-based measurement techniques will be analysed, providing an engineering interpretation of motion-related uncertainty. After understanding the effect of test conditions on the quality of the results, suggestions and tips will be provided to improve measurement accuracy, considering both hardware and software solutions. The discussion will include many practical examples.

HANDS-ON LAB SESSIONS


- Discrete and Continuous Scanning Vibrometry
- Tracking TLDV Laser Doppler Vibrometer - CSLDV
- Rotational - In-Plane Vibrometry
- 3D Digital image correlation and optical point marker tracking for the data generation as input into the modal analysis - by GOM GmbH
- Synchronous Optical Vibrometry with MPV-800 Multipoint Vibrometer - by Polytec GmbH
- New Infra-Red Vibrometer for measurements with Xtra performance, OFV-5000-Xtra- by Polytec GmbH
- Vibration measurements using compact Self-Mixing laser vibrometer and triangulation sensor: comparative analysis - comparison in terms of working distance, measurable vibration amplitude, noise, speckle-pattern effects, in-plane motion of target - by Julight Srl


 


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