Siemens Q-MED User manual

-
User Manual
Low Frequency Monopole Source [Q-MED]
Simcenter Qsources Excitation Hardware

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Thank you for purchasingthe SimcenterTM Qsources Low Frequency Monopole Source.
This product has been manufactured under strict qualitycontrol.
Please take a moment to read the manual. It will provide you with the necessary information to operate the
Simcenter Qsources Low Frequency Monopole Source in an optimal and safe way. The manual is intended for the
sources with serial numbers from 7040C till 7106C.

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Contents
Contents...........................................................................................................................................................2
Introduction......................................................................................................................................................3
Component identification..................................................................................................................................5
Safety instructions.............................................................................................................................................7
Operating Instructions.......................................................................................................................................8
Positioning the source...................................................................................................................................8
Connecting the source ..................................................................................................................................9
Typical measurement settings......................................................................................................................10
Electronic protection...................................................................................................................................11
Stocking the source.....................................................................................................................................12
Technical specifications...................................................................................................................................13
Error diagnosis and maintenance.....................................................................................................................14
Legal notice....................................................................................................................................................15
Warranty and liability.......................................................................................................................................15
Shipment preparation......................................................................................................................................15
Operating Essentials Q-MED Simcenter Qsources Low Frequency Monopole Source ..........................................16
Simcenter Qsources Portfolio...........................................................................................................................16
Global Technical Access Center........................................................................................................................18

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Introduction
The Simcenter Qsources Low Frequency Monopole Source isa very compact volume displacement source. This
deviceis especiallysuitable for lower frequency, reciprocal (vibro-)acoustic transfer function measurements in and
aroundvehicles. Itcan be appliedwhere monopole noise emission and compact dimensions areimportant.
The Simcenter Qsources Low Frequency Monopole Source is a unique device due to its internal reference sensor
and its large stroke at low frequencies. The internal sensor measures the source sound strength emitted by the
source and is the reference for accurate FRF measurements. It is a monopole source withno (or negligible)
diffraction effect for frequencies well over 1 000 Hz. Measurements can be done either in a direct or reciprocal way.

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Application area
The Simcenter Qsources Low Frequency Monopole Source is a volume displacement source. They are used to
perform calibrated (vibro-) acoustic transfer function measurements. The transfer functions can serve several
purposes:
•Acoustic modal analysis of enclosed cavities
•Coupledstructural-acoustic modal analysis
•Quantification of noise from structural excitation (via reciprocity)
•Quantification of acoustic induced vibration of structures
•Quantification of in-situ airborne isolation or airborne transfer
Cross vehicle (vibro-) acoustic transfer function measurement
The Simcenter Qsources Low Frequency Monopole Source can be used on vehicles to investigate the body isolation
between operational sound source locations and the interior target microphones. As the source has similar omni-
directional characteristics as a microphone, the measurement can be done either in a director reciprocal way.
A typical instrumentation includes 24 to 60 channel SCADAS frontend, one or two sources and 20-30 microphones.
Typical software includes Simcenter Test.lab Spectral Acquisition.
Acoustic modal analysis passenger car cavities
The Simcenter Qsources Low Frequency Monopole Source is able to excite the acoustic cavity of a passenger car up
to 1 kHz. This makes it an ideal excitation device to derive the complex acoustic modes inside a car. To excite all
modes inside the cavity the minimum number of excitation locations typically exceeds 6. Its small size practically
prevents any influence of the soundfield. It can also be positioned in many space constraint areas like the pedal
areaorunder theseat.Aset ofsourcescanalso be used as ina Multiple-Input,Multiple-Output configuration(MIMO)
wheresourcesare actuated in parallel with uncorrelated signals.
A typical instrumentation comprises of one or more Simcenter Qsources Low Frequency Monopole Sources, 60-
100 microphones and a Simcenter SCADAS frontend. Typical software includes Simcenter Test.lab Spectral
Acquisition. To emphasize the low frequency output, pink noise can be applied. Monitor the body temperature of
the source when using the source at its limits. Adjust the amplificationlevel such that the electronic protection of
the source is not active.

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Component identification
The package consists of following separate parts:
Flight case
Manual + sensitivity sheet Flash memory USB drive
Signal and power cable with LEMO
connectors
Main power cable with integrated,
electronic protection device
¼”-20 UNC to M6 adaptor
for mounting.
Low Frequency Monopole Source
Eye bolt for vertical mounting

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Part Quantity
Flight case 1
Low Frequency Monopole Source 1
Main power cable with integrated, electronic protection device 1
Signal and power cable with LEMO® connectors 1
User manual + sensitivity sheet 1
Flash memory USB drive 1
¼” to M6 Adaptor for mounting 1
Eyebolt for vertical mounting 1

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Safety instructions
Please follow the instructions below in orderto produce correct results and prevent unnecessary damage. It will
also allow the user to maintain right to warranty. Please find a one-page summarycomprising of all essential
operating do’s and don’ts atthe end of this manual, designed to be printed out and kept closeto the product.
•Never connect the power leads to a DC power source orto a 115 Vor 230 Vmainsoutlet. This will destroy the
sourceand its cabling. Connection toa 115 V or 230 V mains outletalso poses asevererisk for electric shock,
burnsand fire.
•It is advised tolimitthe signals going intothe device withinthe frequency rangefrom 10 ‒3000 Hz.
•The reference sensor shouldbe used in voltage AC mode, not IEPE.
•Never connect the source to a power amplifier without the protection circuit.
•Do not:
oDrop the source on a hard surface.
oOpenthehousing.
oSubmerge the volume source in water orother fluid.
oUse the source in an environment warmer than 40°C or colder than 0°C.
oTransport the source in an environment warmer than 70°C or colder than -10°C.
oShort the power cable oncethey are connected toa power amplifier.
Damage as a result of not following the above instructions will result in a loss of the right to warranty.

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Operating Instructions
Positioning the source
The source can be used in and around vehicles. Make sure the area around the proximity of the source is free of
metal dust/debris as the powerful magnets may attract this. Infiltration of debris may result inloss of performance.
There areseveral options to position thesource at the desired location.
Use a M6 rod fixed at one of the twoinner M6 threads.
Use the M6eyebolt which servesas a hookup point for elastic ropes, bungees, zip-tie
Use the bluefoam inthe flightcase cover for acousticallytransparent support
Use the thread adaptor to interface with photographic mounting material
The source can besupported with bungees for dynamic structural decoupling. It can also be put on foam that has
an open cell structure. The structure of the foam incorporated in the cover of the flightcase ensures low frequent
noise emission is not affected.
There aretwo thread inserts available on the outer faces of the device. Thethread typeis metric M6. These can be
used for fixing the source in any orientation.
The threadadaptorcan beusedto mount thesourceonto atypical microphone standthread (¼”-20UNCto M6
adaptor). Fasten hand tight only. An optional tripod is optional, material code: AL0006, available through your local
Siemens PLM Softwareoffice.
Picture: ¼”-20 UNC to M6
adaptor for mounting.
Picture: The eyebolt can be mounted in one
of the threadholes

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Connecting the source
Powering
The source has simply one LEMO multi-pin receptacle transmitting both electric power into the source as well as
outputting the sound source strength equivalent voltage. The LEMO connection is Push-Pull self-latching. Align the
red dots on both ends oftheconnection and push theconnector in axially. Disengagethe connector by pulling the
outer release sleeve.
The other end of the cable connects to the electronic protection device in the main power cable.
The source must be powered by an instrumentation amplifier like the Simcenter Qsources Measurement Power
Amplifier.
The main power cable of this device has two black banana plugs, whichshould beconnected to the power amplifier.
Turnthe amplifier on when the output level is zero.
The following picture gives an overviewof the connectionsof the electronic protection device.
Picture: LEMO
connector
Red dot Release sleeve
Axial direction
From
source
From
amplifier
To ADC channel (BNC
connection)
Picture: Electronic protection device

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Typical measurement settings
The source can be drivenwith any band-limited signal between 10 and 1 000 Hz.
For accurate frequency response measurements on linear structures burst random and continuous random signals
can be used.
Following tableshows typicalsettings for Simcenter Test.Lab Spectral Acquisition:
Specification Value
Bandwidth 1280 Hz
Frequency resolution 0.5 Hz
Number of averages 100
FRF estimator H1
Burst or continuous random Apply appropriate windowing
Frequency definition Absolute50 ‒1 280Hz
Type of signal Random pink noise
Simcenter SCADAS DAC Output voltage 5 V
Amplifiersetting +26 dB
These settings can be used to drive the source for minutes. This warms up the source and will provide repeatable
results.Inordertoreducethecoldeffectonthereference sensoroutput,itisadvisedto usethissignalfor5minutes.

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Electronic protection
The Monopolesourcemust be powered by an instrumentationamplifier likethe Simcenter Qsources Measurement
PowerAmplifier (product code:Q-AMP230V or Q-AMP115V). A high-qualityaudio or PA amplifier can also be used.
An undistorted RMS power output ofat least 50 Watt to 8 Ohms impedance is required.
An electronic protection device is integrated in the main power cable. The including electronic protection device is
intended for this particular source only and will protect it against overload. A normal procedure to achieve maximum
level of output is to increase the amplifier output slowly until the electronic protection device acts. As soon as the
signal level becomes hazardous to the source, the internal protection circuit will start to limit the signal. When the
electronics starts to interfere, the red LED light will be activated.
1. In the first stage, the protection circuit will first limit the voltage peaks. Depending on the signal nature,
this can sometimes be heard as an increased distortion of the sound. In this mode the source can still be
used over long periods for measurements.
2. In the second stage, when the signal level is increased further, the protection circuit will suddenlyincrease
the impedance of the system that will cause a decrease in the output noise level by 10 dB or more. This
can be heard as a dropin noise level.
The secondstage can act rapidly when excessive levelis applied or it canactafter a fewminutes when the system
risks overheating. Also, if thesecond stage isactive,the sourceshould not be used for measurements, because a
large amount of electrical energy is now dissipated and both the sourceand the used amplifier will heat-up
considerably without significant soundor noise.
After the signal level from the amplifier is decreased manuallyto zero, the protection circuit will reset and once
again allow normal use.
If high noiselevelsare needed for measurements, itis advised to experiment with signal types andfrequency
range ofthe applied signal. Even if this causes repeated interruptionof thesource by the protection circuit, such
experimentswill not damage the source. This is trueas longas the used power amplifier does not malfunction
(relevant when using a non- Simcenter Qsourcesamplifier). The Simcenter Qsources Measurement Power
Amplifieris internally protectedagainst overload, shortcut,signal loops, etc. This procedure will normally allow
ample noise levels for normal applications.
50 Hz or 60Hz content inthesignal can also cause this problem.
When drivingthe source in coldconditions, a rattle noise can be heard which will decrease in time. This high
frequency rattle does not influence the FRF measurement<1000Hz.
Warning
:When the secondstage is active, thesignal level should be decreased manually.

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Internal source strength sensor
The sensor output voltage is proportional to the source volume displacement in the frequency range between 10
and 1 000 Hz. The sensor provides a stable signal, but the voltage level is in millivolts only. The sensor works in
voltagemode, not IEPE, nor charge, nor Wheatstone bridge. There is no supply needed.
The actual sensitivityvalue of each signal is given on the “sensitivity sheet”, included separatelyin the delivery. The
acoustic center is in the middleon thecenterline of the device.
The reference signal can be directly connected to the Simcenter SCADAS frontend. The channel mode of the sensor
is Voltage AC, not IEPE. The unit of a common acoustic FRFis 
/. You cannot measure this directly with this
excitation device. The sensitivity value provided on the sensitivity sheet is in   . If an acoustic FRFis measured
for example, the unit will be  
. Doubleintegration ofthe FRF will result in 
/.
Stocking the source
The device is to be stored and transported using the original flight case. Make sure the flight case is free of debris.
Be careful with small metal debris as it is attracted by the powerful magnets and may infiltrate the source. Use a
plasticbag forstorage. Keeptheoriginal packing material which should beused forshipment.

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Technical specifications
Specification Feature *
Dimensions (ex. connector) Ø70 x 206 mm
Mass 1.75 kg
Effective frequency range 10 ‒1 000 Hz
Constant sensitivity freq. range 10 ‒1 000 Hz, ±2 dB
Omnidirectionality freq. range 10 ‒2 000 Hz, ±2 dB
Output signal condition requirement VoltageAC
Signal output connector socket type Female BNC
Amplifier interface connection type 4mm banana plug
* Performances and dimensions of the device, as stated above, are an indication only. The actual values of the
delivered product can deviate from the given specification. However, in most of such cases the specifications will
exceed the given ones above, because of improvements in the used materials and design.

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Error diagnosis and maintenance
The input channel for the internal reference sensor is to be seton Voltage AC. An acoustic semi-free field FRF can
be measured to check the microphones and source used for the test campaign. With all microphones bundled
together at the same distance from the source, phase and amplitude should be the same in the lower frequency
range. Whenthe distanceina semi-free field (e.g.in asemi-anechoic room) is 0.5 meters,theamplitude should be
between0.3and0.4. A(vibro-)acoustic reciprocal measurementcan also helpin understanding unexpectedresults.
The output of the source can reduce suddenly during the measurements. This is due to the electronic protection
that interferes. Stop the measurement, let it cool down for a few minutes, reduce the output and restart the
measurement. Putthe electronic protection in suchorientation so that the LED is visible duringthe measurement.
The sensitivityof the sources as provided by Simcenter Qsources does not vary over time (within reason). This can
however beimpaired by mechanical damageor electrical overload in excess of the given specification.
When driving the source in cold conditions, a rattle noise can be heard which will decreasein time. This high
frequency rattle does not influence the FRF measurement.
If wished by the user, a sensitivity measurement service is offered by Simcenter Qsources for re measurement of
the source performance and sensitivity (product code: Q-SR-SENS). It is advised to let the source work for some time
to warm up(e.g. 5 minutes at maximumlevel).

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Legal notice
All Simcenter Qsources products and product specifications are subject to changewithout noticeto improve
reliability, design or otherwise. The operating instructions inthis manual represent the technical status at thetime
of printing.
Siemens Industry Software NV has taken reasonable care to ensure the information is complete andcorrect but
does not warrant the liability for any errors or spelling mistakes. However, the information in this publication is
reviewed regularlyand any necessary corrections are included in subsequent editions.
Warranty and liability
For detailed information onwarranty and liability,see the STS Simcenter Hardware “Product Specific Terms”.
Shipment preparation
In order to ship your product in a safe and robustway, welike to give yousomeadditional packinghints.
•In case ofshipment for service: pack one product perHR TAC identification number.
•Please makesure the package is completeto enablea full service.
•Remove any add-ons, tape, glue or custom-made auxiliaries.
•Please pack theflightcase in theoriginal cardboard box or equivalent.
•Pack the products in a way that reduces the chance of shocks or scratching.

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Operating Essentials Q-MED
Simcenter Qsources Low Frequency Monopole Source
•Store products in original flight case when not used.
•Never leave products unattended while in operation.
•Do not apply an excitation signal tothe sensor output connection.
•Do not operate when safety LEDsare lighting up.
•Source should not be in safety mode for more than 30s.
•Sensor cables must not lay alongside cables carrying power or large
switching currents.
•Never use without electronic protection device.
•Strong magnetsinside. Never place product near (metal) debris or dust.
•Do not apply tension to signal cables/connectors.
•Do not move testbody when product is installed.
•Never use workshop tools to remove product.
•Never open the housing.
•Avoid ground loops.
*
Incase
of deviating measurement conditions
, please
reachout to your local
Siemens
contact
for more information
.
No single sine signals.
No impulsive signals
e.g. square waves.
No signals below10Hz.
Operate source max 5min
continuously.
Avoid hot/cold
environments
Handle with care
Read manual
Avoid contact with
any fluids

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Simcenter Qsources Portfolio
Simcenter Engineering uses its experience inNVHtechnology to continuously develop new acoustic and structural
exciters under the brand name Simcenter Qsources.
Products
•
Frequency range: 10 ‒1 000 Hz
•Real-time volume acceleration
referencesignal
•Human torso diffraction effect
Low Mid Frequency Source
•
Frequency range: 150 ‒10 000 Hz
•Real-time volume acceleration
reference signal
Mid High Frequency Source
•
Excitation possible from 5 Hz
•Excitation possible in any orientation
•Self-supportingand self-aligning
Thumper Shaker
•Frequency range: 20 ‒2 000 Hz
•Integrated forceand acceleration
transducer
Integral Shaker
Miniature Shaker
•Frequency range: 50 ‒5 000 Hz
•Integrated force and acceleration
transducer
Low Freq. Monopole Source
•
Dual driver technology
•Monopole until 1 000 Hz,
no diffraction effect
•Internal source strength sensor
Detailed information can be found on https://www.plm.automation.siemens.com/global/en/products/simulation-test/exciters.html
High Frequency shaker
•Frequency range: 500 ‒10 000 Hz
•Low mass loading
•Integrated force sensor
Measurement Power Amplifier
•
Accurate amplification
•Frequency range: 10 ‒40 000 Hz
•High pass filter

Simcenter Qsources Low Frequency Monopole Source 2v9C.docx 18
Global Technical Access Center
Installation assistance
Foradditional installation assistance,or toreport any problems,contactthe Global Technical Access Center (GTAC).
Website:
https://www.plm.automation.siemens.com/global/en/support/
Phone:
United States and Canada: 800-955-0000 or 714-952-5444
Outside the United States and Canada: Contact your local support office.

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Siemens Industry Software
Headquarters
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5800 Granite Parkway
Suite 600
Plano, TX 75024
USA
[phone]
Americas
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Suite 600
Plano, TX 75024
USA
[phone]
About Siemens PLM Software
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Siemens Industry Automation Division, is a leading
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software and services with 7 million licensed seats and
71,000 customers worldwide. Headquartered in Plano,
Texas, Siemens PLM Software works collaboratively
with companies to deliver open solutions that help
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