Improvements in Sound & Vibration Analysis
in the Automotive Industry.
Powerful new technology, which combines cutting edge
hardware and signal processing with dedicated application
specific software modules, now offers the Automotive
Industry the opportunity to make startling improvements
in sound and vibration based analysis.
The OR38, a robust and powerful 32-channel, portable, real-time
analyser boasts more channels and more DSP power than ever
before. The flexible software and ingenious design also allows
simultaneous analysis and recording along with the capacity for
machinery diagnostic, modal analysis and NVH.
Weighing barely 7kg, the OR38 is based on a compact chassis
that includes an AC/DC power supply and battery along with 2
analogue generator outputs, 2 external syncs, Ethernet interface,
remote control and LCD front panel. Because it's scalable, it's
possible to choose the number and type of input channels as
well as processing power to match your measurement needs.
As for processing power, the DSP architecture processes all the
data in the analyser, leaving the PC available for running any
application software simultaneously. Multiple DSPs guarantee
true real-time analysis up to 100 Ch. x 20 kHz FFT bandwidth.
Useful for Machinery Diagnostics, the OR38 allows for the tracking
of characteristic orders of rotating machines while displaying orbits
and determining structural resonance with real-time FFTs.
Of particular interest to the automotive industry - vehicle structure
modal analysis requires numerous channels - the 32 Channel OR38
allows the technician speedy measurement with instantaneous FRFs.
Moreover, because the unit carries out the analysis, it frees the PC
to process applications such as a live ODS display.
Additionally, engine noise can be measured in octave bands in
parallel with tracked orders or structural vibrations with FFT, with
fast and slow inputs performing simultaneous acquisition of
process and vibration data.
The report generation facility allows the technician to edit and print
reports either directly or through MS Word.
Another important aspect for the OROS customer in the UK is the
level of backup and after-sales service. Livingston based
Diagnostic Instruments already have an excellent reputation in
the field of noise and vibration analysis. Having spearheaded
the research and development within the field of noise and
vibration analysis they are now sole UK distributors for the unit.
Diagnostic Instruments' background in this field means that they
are in a position to offer OROS customers a superb back-up
package.
"We see ourselves as much more than simply a distributor for
the OR38," said Robert Collyer, Engineering Services Manager
at Diagnostic Instruments. "Because of our background in every
aspect of noise and vibration analysis, we can offer our expertise
and experience, not to mention consultancy, training and back up."
TECHNICAL INFORMATION
System Features
Channel count - 32 inputs sampled at 102.4kHz -AC/DC/Float
and ICP ® coupling
Inputs - 24 bit Delta/sigma converters -high dynamic >120 dB
± 20 mV to ± 40 V input range
Accuracy - Phase ± 0.1 ° -Amplitude ± 0.05 dB - Frequency ± 0.01%
Self calibration circuitry
Output channels - 2 Outputs,± 10 V range,24 bits,40 kHz
External syncs - 2 External syncs,± 40 V range for trigger or
tachometerMax sampling rate :12.8 MHz.
Miscellaneous I/O - 4 Auxiliary I/O for additional output or external
syncs.
Real-time capabilities - 2 MHz Channels x bandwidth product
equivalent to 20 kHz FFT on 100 channels (401 lines,0%overlap).
Throughput rate - Internal 20 GBytes disk rate without missing
sample:32 Channels sampled at 51.2 kHz (gap free)
PC interface - 100 Mb/s Ethernet PC connectionsWindows ® 98
//Me/2000 and NT4 compatible.
Operation mode - PC connected -stand alone -office software version
Generator - Sine,multi-sine,swept sine,triangle,random white
noise,pink noise,chirp,burst,user-defined,file playback.
Power - AC 100 to 240 V - DC 10.5 V to 32 V -On-board battery
for protection against surge and power outage (>30 min).
ANALYSIS MODES
Amplitude analysis - DC,RMS,Energy,Power,Skew,Kurtosis,
min,max,correlation in selected frequency band on each channel.
Frequency analysis - Instant and averaged spectrum,FRF,
Coherence,Constant band tracking -Zoom - Multiple FFT analysis
on independent frequency band-6400 FFT lines -DC ->800 mHz to
DC ->40 kHz
Digital filter 1/n th octave analysis - 1,1/3,1/12,1/24 Octave
-Weighting A,B,C,Leq,fast,slow Comply with IEC1260
Order tracking - Real-time order tracking based on synchronous
re-samplingTime domain synchronous -1/32 order resolution
Recorder - Multi frequency simultaneous recording -Advanced
triggering mode -Native format is ASAM compatible
Monitoring - Live wave and spectrum preview on any channels.
Multi analysis - Al l analysis mode may run simultaneously on
different or common shared inputs.
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November 2001
