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Optical Engineering

Laser vibrometry vibration measurements on vehicle cabins in running conditions: helicopter mock-up application
Author(s): Gian M. Revel; Paolo Castellini; Paolo Chiariotti; Enrico P. Tomasini; Fausto Cenedese; Alessandro Perazzolo
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Paper Abstract

The present work deals with the analysis of problems and potentials of laser vibrometer measurements inside vehicle cabins in running conditions, with particular reference to helicopters where interior vibro-acoustic issues are very important. This paper describes the results of a systematic measurement campaign performed on an Agusta A109MKII mock-up. The aim is to evaluate the applicability of scanning laser Doppler vibrometer (SLDV) for tests in simulated flying conditions and to understand how performances of the technique are affected when the laser head is placed inside the cabin, thus being subjected to interfering inputs. First a brief description of the performed test cases and the used measuring set-ups are given. Comparative tests between the SLDV and accelerometers are presented, analyzing the achievable performances for the specific application. Results obtained measuring with the SLDV placed inside the helicopter cabin during operative excitation conditions are compared with those performed with the laser lying outside the mock-up, these last being considered as "reference measurements." Finally, in order to give an estimate of the uncertainty level on measured signals, a study linking the admitted percentage of noise content on vibrometer signals due to laser head vibration levels will be introduced.

Paper Details

Date Published: 1 October 2011
PDF: 12 pages
Opt. Eng. 50(10) 101502 doi: 10.1117/1.3578447
Published in: Optical Engineering Volume 50, Issue 10
Show Author Affiliations
Gian M. Revel, Univ. Politecnica delle Marche (Italy)
Paolo Castellini, Univ. Politecnica delle Marche (Italy)
Paolo Chiariotti, Univ. Politecnica delle Marche (Italy)
Enrico P. Tomasini, Univ. Politecnica delle Marche (Italy)
Fausto Cenedese, AgustaWestland (Italy)
Alessandro Perazzolo, AgustaWestland (Italy)

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