Energy and Process Industries - Noise and Vibration Test and Measurement Solutions0 pages

Verso (Intérieur) page 2

Verso (Intérieur) page 4

Made for Your
Demanding World
1- Improve Efciency
Test Cells

Measuring your Rotating Machinery

2- Maximize Uptime

3- Minimize Costs

> Prototype validation

Improve acceptance testing
efciency

> Overhaul and acceptance
at OEM

> Integrated & automated test
process and report generation
> User friendly operation
> Multi-channel real-time processing
and monitoring
> Universal and multiple sensors’
types: proximity, velocity,
acceleration, temperature, strain,
pressure, etc

Rotating Analysis
Fluid Film Bearings
Relative shaft vibration is captured with proximity probes. Analyzing this data requires a
number of software tools such as orbit and shaft centerline analysis. ORBIGate, the OROS
turbomachinery vibration solution, features these analysis and many more analysis tools. These tools
display the physical motion of the shaft and let you detect faults such as oil whirl & whip, preload,
misalignment, rub and others.

Field Testing

Travel light for reliable tests

> On-site commissioning

> Versatile toolbox for all noise and
vibration diagnostic applications
> Portable and rugged analyzers for
the eld measurements

> Installation vibration
signatures

> Multi-channel simultaneous
acquisition for run-up and coast
downs

> Diagnostics and
troubleshooting

> Real-time analysis for eld efciency
> Full signal recording for ofce
processing and archiving

Remote Monitoring
> After installation follow-up

Optimize costs and predict
failure

> Random & unrepeatable
phenomena

> Alarm trigerring warning via email or
the Internet
> Collect raw signal information for
thorough ofce processing

Gear boxes have a complex vibration signature, usually occurring at high frequencies. The
FFT-Diagnostics tool, such as cepstrum, kurtosis and harmonic markers are necessary
to describe and understand the generated vibrations. The virtual tachometers management feature
allows the analyst to determine the speed and phase information based on the gear ratio.

Greg PARKER, 39

Noise and Vibration technician,
Installation & Maintenance division.

oros.com

www.

> Compressors
> Pumps
> Hydro Turbines
> Wind Mills
> Fans and Blowers

Reciprocating Machinery
> Internal Combustion Engines: Diesel and Gas
> Reciprocating Compressors

Reciprocating machines are complex installations. They generate specic vibration
signatures. The objective is their performance optimization and faults detections. For
example, injection delay, valves faults, segmentation wear can be identied with EngineDiag. This
software module integrates the machine mechanical properties: number of cylinders, ring order and
timing diagram, allowing to provide pertinent decision criteria on the eld. Time signal, overall levels as
well as angle-frequency representation on the machine cycle are efcient results for diagnostics.

Balancing
Imbalance is probably the most common source of vibration on rotating machinery.
Depending on the machine and the rotating speed range the rotor can be considered to be
rigid or exible. In the rst case, the Single Dual plane balancing module will be used. In the second
case a multiplane approach should be preferred and the associated Multiplane module should be
used.

ODS (Operating Deection Shape)
Operating deection shape is an important analysis procedure used to
locate machinery and piping system deection during operation. It is
based upon simplied geometry description of the machine train. After measuring the
vibration response at multiple locations, the mechanical source can be identied. The
ODS software module helps to determine vibration sources, a transmission point
and eventually a mechanical modication to be implemented.

Generators and motors end windings are strongly excited by frequencies
at twice the network frequency: any mode nearby that frequency will
create high vibration response. FFT analyzers and Modal, the OROS Structural
Dynamics module, are well adapted for bump tests acquisition, resonance frequency
determination and deection shapes.

Blade Modal Testing
When blade dynamic structural characteristics should be determined,
they are submitted to modal testing: based on impact hammer testing or
shaker excitation. Based on multichannel analyzers, vibration response can be
captured by accelerometers or strain gauges. Modal, the OROS Structural
Dynamics module, can process the FRFs to give the modal characteristics.

Damping & Isolation
Dynamic coupling between machine trains and their skids or foundations
can be a problem during the machine installation and the eld acceptance
test. Excitation frequencies should not match the response frequencies of the hosting
structure: the mounting choice is key. To tackle this issue, OROS products such as
transfer functions, ODS, and damping calculations assist the user in the
procedures.

Torsional Analysis
Torsional vibration and torque uctuation are usual phenomena especially on large internal
combustion engines. The OROS torsional software module utilizes a frequency
to voltage converter for speed input providing the following information: the angular velocity prole
displays RPM variations. 2 pulse train combination detects torsional resonances.

Structural Dynamics

End Winding Bump Testing

Reciprocating Machines Analysis

Experts from OROS come on-site for applied trainings. They will help you using your OROS
system. They can provide assistance in your measurement. They are also able to
recommend optimization in your measurement process depending on your application and
eld requirements.

> “From rotating analysis to structural dynamic analysis: with my
OROS system, I am ready for everything when I go out in the eld.”

> Gas and Steam Turbines

Damaged roller bearings are common. Their vibration signatures are usually measured with
an accelerometer mounted on the bearing housing. In particular, the FFT-Diagnostics
module uses envelope demodulation to analyze these vibration sources to determine if the source is
from the roller elements or the races.

On-Site Measurements & Applied Trainings

They trust Oros

Turbines and Compressors

Roller Bearings

Gear Analysis

> Machinery startup

Verso (Intérieur) page 5

Electric Machines
> Electric Motors
> Power Generators

Noise Analysis
Octave & Sound Intensity Safety
The ambient noise generated from rotating machinery can be evaluated
using general tools such as the 1/3 octave analysis. But more thorough
measurements can be achieved using the sound power value. The sound intensity
technique is often completed in the eld thanks to its portability and adaptability.