Monday, May 13, 2019

OROS Testing Room

A new testing room is now open at OROS. This room is fully dedicated to noise and vibration testing. It is a base for applied training events as well as for client tests. It is equipped, amongst other things, with an anechoic chamber, a rotating machine, a structure assigned to modal testing, an acoustic antenna for holography and special speakers for sound quality testing.

The anechoic chamber is used for sound power measurements (see images: an eletric driller under test and Corentin setting up the project)

The latest version of ORBIGate is being tested using the rotating machine. Measurements are made with an OR36 coupled with accelerometers, tachometers and proximity probes.

Assessing the vibration behaviour of generator stator end-windings - Laborelec, GDF Suez

Generator stator end-windings are submitted in operation to a combination of complex electromagnetic and mechanic forces. These forces recurrently lead to the early ageing of the end-windings through the appearance of white dusting and greasing detected by inspections during overhaul. The vibration behaviour of the end-windings is regularly depicted as one of the main
contributors to the root cause. Based on OROS instruments, Laborelec offers a complete methodology specifically developed for the vibration assessment of generator stator end-windings. This methodology is universal for all machine types and is independent from the generator manufacturer.

Read the full application note on myOROS (first log in to myOROS or create an account). Laborelec, GDF Suez

Monday, May 6, 2019

Experimental verification of underwater noise localization based on cylindrical near-field acoustic holography

Paper presented during the Technology Workshops Teledyne Marine in Cannes, France in October 2018 by Guillaume Cousin, OROS Solutions Product Manager.

To improve the stealthiness of underwater vehicles, or reduce impacts of vessels on the marine environment, it is necessary to identify their noise sources. Furthermore, the proper acoustic control and management of underwater noise radiation of vessels is critical during the intended upgrades and operational service.