10 June 2014
Welcome to our latest Test & Measurement Newsletter. Please let us know your views and interests by emailing firstname.lastname@example.org.
In this Issue:
- Mission to Mercury with the Help of m+p Vibration Controller
- Safe Vibration Testing
- Automotive: High-Frequency Vibration Test Rig for Elastomer Mounts
1. Mission to Mercury with the Help of m+p Vibration Controller
BepiColombo is a joint mission of the European Space Agency (ESA) and the Japan Aerospace Exploration Agency (JAXA) to the still largely unexplored planet Mercury. It is scheduled to launch for the six-year journey
in July 2016. At its site near Munich, Germany our long-time customer Airbus Defence and Space develops and builds solar arrays for BepiColombo. The biggest challenge here is preparing the arrays to withstand temperature fluctuations ranging between -270 and +510 degrees Fahrenheit and to protect them from the sun’s intense
Multi-channel vibration testing of BepiColombo‘s solar arrays using m+p VibControl
The solar arrays undergo comprehensive vibration testing. Astrium Defence and Space uses the proven
m+p VibControl system with 2 x 128 input channels to perform these tests.
The m+p VibControl software and hardware utilize many safety features to ensure reliable closed-loop vibration control – from pre-test checks to abort checking, notching and controlled shutdown.
One key element of successful testing is how the m+p VibControl software creates a safer vibration test environment. We have all been there as test engineers, ready to push the ‘go’ button; however, there are always the doubts in the back of our minds like:
- Are the accelerometer sensitivities correct?
- Are the cables OK?
- Is the test specification correct?
- Is the payload attached to the shaker correctly?
- Is my fixture fit for purpose?
- Do I have enough force in my shaker?
The list goes on, however the VibControl self-check will help catch many of these potential problems before proceeding with the full test. Many customers ask ‘Why do we have to perform a self-check every time?’
Well, the simple answer is safety!
To learn more about the self-check feature, please read the article “Safe Vibration Testing with m+p VibControl Software”.
During closed-loop control the m+p VibControl software performs RMS and line-by-line abort checks, sigma clipping and drive limitation and continuously checks for open channels and overloads.
Notching limits the upper vibration level on any number of control or measurement channels, thus minimizing over-testing of the structure.
The m+p VibPilot and m+p VibRunner hardware has a digital interface with one input channel serving as safety shutdown triggered by an external event. The VXIbus systems provide a front-panel shutdown port. In case of emergency, the measurement hardware will be shut down and the DAC signals ramped down in a controlled manner. The shutdown function requires an Emergency-stop switch connected to the shutdown port of the signal generator.
For more information about the m+p VibControl safety functions and our products or to arrange a demonstration please contact us at (+1) 973 239 3005 or email@example.com.
The comfort characteristics of a vehicle are largely determined by the interior acoustics. To reduce noises generated within the cabin, elastomer mounts can be used to block the path from the source of vibration to the interior of the vehicle.
In order to characterize the frequency response of elastomer mounts over a suitable range (the human ear is most sensitive in the range 1-2 kHz), a test rig was developed through cooperation between m+p international, the IDS Institute of Leibniz University and Continental AG, all located in Hanover, Germany.
High-frequency vibration test rig
The actuators of this test rig are piezoelectric and use the inverse piezoelectric effect, where a voltage is applied
to the material to produce a mechanical movement. These devices are particularly suitable for this application because of their low amplitude and high frequency range. Actuator, specimen and measurement sensor are effectively isolated from the frame. The m+p VibControl system is used for vibration testing, data acquisition and analysis.
Read more in the 2-page article “New vibration test rig” published in the June 2014 issue of the Automotive Testing International magazine.
Well, that brings to a close this edition of the m+p international Newsletter. If there are items of information you would like to see here or if you have useful tips for the rest of the environmental test world, then please send us your pointers and we'll include them in the next edition.
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