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Topics
Closed loop Acoustic Control at NASA Langley
Visiting Titan with m+p controllers
Time Replication makes RoadLoad testing even easier
JPL Relies on m+p international for Vibration Testing
A New Method of Designing MIL STD (et al) Shock Tests
The Fundamentals of Modal Analysis
The Basics of Vibration Testing
Closed-Loop Acoustic Controller
Guido Bossaert, m+p international, inc., Verona, New Jersey, and Stephen A.
Rizzi, NASA Langley Research Center, Hampton, Virigina, describe recent
improvements to the acoustic control system of the Thermal Acoustic Fatigue
Apparatus, a progressive wave tube test facility at the NASA Langley Research
Center in Hampton.
Please read the article "Closed-Loop Control for
Sonic Fatigue Testing Systems" published in the Sound & Vibration
magazine in November 2001.
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Titan mission helped by m+p's force limiting controllers
Terry Scharton from JPL describes the variety of sophisticated testing
undertaken on the Cassini Huygens space craft destined for Saturn's moon, Titan.
As well as a wealth of technical detail there are some great pictures of the
testing in progress.
Click here to read on ... |
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JPL Relies on m+p international
for Vibration Testing
The Jet Propulsion Laboratory, Pasadena/California used an m+p international vibration control system to qualify the Deep Space 1 (DS1)
spacecraft for NASA. The environmental test program for the DS1 spacecraft included a force-limited random vibration test in two axes.
For detailed information on this test, please read the article
"Deep Space 1 Spacecraft Vibration Qualification Testing"
published in the Sound & Vibration magazine in March 2001.
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A New Method of Designing MIL STD (et al) Shock Tests
The following paper briefly reviews the basic requirements for creating a shock pulse time history
suitable for use by digital controllers on electro-dynamic shakers.
In developing a practical test we not only need to meet the various test specification
requirements we also require to do so within the limits of the available test equipment.
Although most specs define pre and post pulse amplitude limits they do not define their shape
or duration. This provides a very powerful opportunity to choose these pre and post pulses to optimise
compensation to suit other system constraints (eg shaker displacement limit) but without excessive shock
spectra distortion or other undesirable side effects. However since there are an infinite number of possible
solutions this process is far from trivial. Also the symmetrical sinusoidal compensation pulses that are most
commonly used may be easy to compute but do not offer much scope for optimisation.
For more information, please read this interesting paper.
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Time Replication makes RoadLoad testing even easier
Significant advances have been made in data
editing and continuous real time control to
make testing with road load and any other field test data even easier to do.
Applications range from automotive component test to railways to marine to
military gunfire simulation.Please
download
article or request
further details
(ref App 003). |
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The
Fundamentals of Modal Analysis
This
excellent document, covering the practical basics of
Modal Analysis, is courtesy of Agilent Technologies. They
manufacture the VXI based instrumentation that is used in
m+p's top end vibration controllers and dynamic data
acquisition systems capable for use with hundreds of
input channels. m+p's SmartOffice family of products
include a full range of Modal Analysis options as well as
easy to use wizards for both the hammer and shaker
methods of data acquisition discussed in the paper.
Please download article or request further
details (ref App
004).
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The Basics of Vibration Testing
This provides a brief overview of
vibration testing, what it is and the common terminology. Useful for the
novice and the more experienced reader.Please
download
article or request
further details
(ref App 005). |
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