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  • Users: ANTOINE
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  1. ANTOINE

    OROS or PULS system

    I suggest you check the 01dB orchestra system 01dB, inc. ... 01dB Inc - 31 Jordan Street - P.0. Box 796 - Skaneateles, NY 13152 - Phone # 315-685-3141 - Fax # 315- 685-3194www.01dbsupport.com/
  2. ANTOINE

    What is the Value of a "Bump Test"?

    Maybe you ought to take care of the dynamical effect due to the rotating inertia as weel. I have seen cases where the modes shifted enough to tell you that everything is safe in static condition, and get a vibration issue when the machine is running. To get enough force, you can as well use a...
  3. ANTOINE

    Vibration û measuring and analyzing

    Check 01db products (symphonie / harmony / orchestra) depending on the number of channels needed. http://www.01dbsupport.com/
  4. ANTOINE

    extremely small accelerometers needed

    Check out Endevco 2222C
  5. ANTOINE

    Intensity mapping Vs pressure mapping

    As greg says : We have tried intensity with a accelerometer and mike close to it and it works. Holography techniques are based on the acquiisition and separation of both active and recative fields, and are much more accurate in source localization that intensity or pressure.We happen to be...
  6. ANTOINE

    accelerometer pick up for natural frequency test of rotor blades

    To my knowledge the pure way to look at this is to say that the added mass of the accelerometer should not be more than 10% of the modal mass of the structure. To have the modal mass you have to perform a modal analysis and thus make measurements on the blade ... if you can do those measurements...
  7. ANTOINE

    what is LMS software , can i get a trial version

    DSPT Siglab/Matlab platform are a good compromise for versatility at reduced costs but it comes with reduced stability as well...A lot of people have developped codes under the Matlab environment making similar things as what you can find on LMS (NPA)...I use it with STAR systems for modal or...
  8. ANTOINE

    basics in vibrations

    I guess the Harris handbook of noise and vibration is a good start...The Beranek should be close to you too...
  9. ANTOINE

    Help for system vibration coupling problem

    Well you will mainly see the scanning frequencies as greg sais, but this is assuming the control of the mirror provides pure sine motions. If the scanning motions are more like sawtooth, then you will see many harmonics on a FFT (decomposition in sines). If the motion involves shocks, as if for...
  10. ANTOINE

    LIMIT OF HIGH AXIAL VIBRATION

    If the high axial level is at rotation frequency, you may have a blade poorly oriented resulting in axial loading at rotation frequency. ISO 2372 / BS 4675 can be helpful for limits.
  11. ANTOINE

    BASIC MODELING (Let's put it this way)

    Dmitry, If you aretalking about free response, the modal characteristics, i.e. natural frequency, deformed shape and associated modal damping depends only on the dimensions, material properties and boundary conditions of the beam in the case of a linear system. Maybe a simple way to handle...
  12. ANTOINE

    Mechanical Noise

    Dave, What is exactly the problem you are facing ? Sound intensity is helpful in noisy environment to quantify and localize sources. You can send info to : thomas.antoine@metravib.fr www.metravib.fr
  13. ANTOINE

    hammer implemented with accelerometer

    Dmitry, You shall not consider the total mass of the structure, but the modal mass,i.e. the amount of material that "moves" at the mode you are considering. Typically, the mass of your measuring equipement,i.e. accelerometer, or in your case modal mass of the hammer shall not exceed...
  14. ANTOINE

    Fuel pump noise

    Have you tried to add a quarterwavelenght resonator at the pump discharge ? For a single pure frequency this can be very efficient. rgds.

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