|
Developed and tested
"production line" Test
System
100%
Noise and Vibration testing can now be performed on your factory floor
without relying on an operators hearing or sense of touch!!!
ESW’s
Noise,
Resonance & Vibration Test Systems are economical,
powerful solutions
for industrial "in-process" and "end-of-the-line" testing
and quality verification.
These systems
are automatic “pass/fail” testers that can
eliminate the need for sound booths.
These systems will remove operator subjectivity from the decision
making process.
There are no meters or scopes for the operator to interpret.
All decisions relating to the acceptability of the part are made
automatically.
The
Noise,
Resonance
& Vibration Test System runs on the Windows™ operating system
as well as ESW’s preinstalled,
user-friendly
software package.
It has
built-in
signal conditioning, an A/D converter for sensor measurements, relays for
digital I/O control
and a
powerful application software for noise,
resonance
and vibration testing. It is
intended for use on AC and DC motors directly on the production floor.
It
is network ready and features an integrated modem for direct, secure access to
ESW’s technical support experts.
Test
systems can either be sold as a complete package for noise,
resonance
and vibration
testing or for any combination of tests that are deemed necessary.
They
can also be integrated into a full Motor Test System.
Standard
tests include NOISE, RESONANCE, SONES dB & RONES for both
unidirectional and bi-directional motor types.
|
TESTS
PERFORMED
|
|
NOISE:
|
Noise
testing analyzes audible noise, generated by a motor, by doing a
frequency analysis and comparing it to an envelope based on a median of
setup motors.
The analysis must have a certain percentage of data points fall
within this envelope or the part will fail.
There
are six different ranges available for noise - 1000 Hz, 2000 Hz, 3000
Hz, 5000 Hz, 7000 Hz and 10,000.
|
|
VIBRATION
&
RESONANCE:
|
Resonance
testing analyzes a combination of audible noise and vibration, generated
by a motor, by doing a frequency analysis and comparing it to an
envelope based on a median of setup motors.
This method tests for resonance by making contact with the motor
body and determines at which frequency and amplitude the motor is
resonant.
The resonant frequency is much larger than other frequencies
generated within the motor.
Resonance is processed the same as noise (FFT analysis) and uses
the same ambient noise cancellation feature as developed by ESW for
noise.
Resonance is measured in Rones.
There
are four ranges available for Resonance - 500 Hz, 1000 Hz, 2000 Hz and
3000 Hz. |
|
AMBIENT
CANCELLATION TECHNIQUE |
|
ESW’s
exclusive ambient cancellation testing technique identifies the ambient
noise,
resonance
and vibration levels on the factory floor and then separates them from
the noises,
resonance's
and vibrations created by the motor-under-test.
This is done each time a motor is tested, allowing
for ambient sampling on every motor.
Readings
are taken before, during and after powering the motor.
The FFT mathematical processing identifies all of the frequencies
(both ambient and
motor).
Our customized software coupled with advanced data storage
capabilities allow the ESW Test
System
to subtract out the ambient portion from the motor portion,
data point by data point.
Noise,
resonance
and vibration data
is stored individually into 30 different frequency bands ranging from
0-10,000 Hz.
These frequency ranges are customized for each application.
ESW also can analyze the data with our unique envelope analysis
software. |
|
COLLECTION
METHODS.
There
are three different methods that
can be used
to collect information from the motor.
A
thorough evaluation of your motors will
determine which is
the best method or combination of methods for your
particular application/process.
|
|
RESONANCE
ACOUSTIC PROBE
|
|
|
The
vibration data
is collected using an
“Exclusive” Resonance Acoustic Probe
specially designed by
ESW.
This unique probe breaks up air movements and ambient
noises into white noise.
The sound channels used
are specifically designed for the
motor-under-test.
A combination of highly repeatable transducers and
ESW's Noise Cancellation Software eliminates 90% -
95% of ambient factory noise and vibrations.
The
Resonance
Acoustic Probe converts mechanical movement from the motor and
motor casing
into sounds.
The diaphragm
controls the movement of air (the vibration) down the
chamber into the collection device. The
tester is then able to look at the frequencies
generated by the movement of the motor before these noises
and vibrations are dispersed into the air.
This probe eliminates the contamination of other
frequencies that could have been picked up along the way.
Only the true readings are displayed.
The
Resonance
Acoustic Probe
is equipped with ESW’s
exclusive spring-loaded constant pressure transducer.
This transducer was developed exclusively for noise
& vibration analysis and is highly repeatable.
Special emphasis is placed
on the
location of these transducers.
The transducer’s
position is isolated from the holder (transducer) and
the motor test fixture to ensure that the vibration picked
up is from the motor. |
|
MICROPHONE
|
|
|
The
use of microphones (even high-end products costing thousands
of dollars) will not guarantee you get “good” broadband
frequency data.
In fact, higher-end microphones also pick up
movements and ambient conditions, resulting in poorer data.
Our
microphones are commercially available and are selected
based upon the application.
The key to our success is how we channel the motor
noise into the microphone.
|
|
ACCELEROMETER
|
|
|
ESW
uses a variety of proven, commercially available
accelerometers.
Our goal is to detect only the vibrations transferred
from the motors.
Extra care is taken to determine the strategic
placement.
|
The best way to
determine if ESW can help you is to send samples for evaluation.
We will provide a free analysis of your motors (up to 6
motors).
For more information
on how to send motors to ESW, click
here.
You can also email
us or call us at 262-554-1211.
|
