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  1. kverspoor

    motor enclosures

    "W" is for weatherprotection. Technically, it should be IP54W but it's probably recognizable either way. NEMA MG1 and IEC 34-5 have the details of what may be required to accomplish weatherprotection but the intent is to reduce the ingress of rain, snow and airborne particles into...
  2. kverspoor

    Overall acceleration & velocity

    Because you have an overall acceleration, the reading is taking into account all vibration in the frequency range - meaning you don't know much in the way of details. If you don't know the vibration levels at individual frequencies throughout the range, you can't convert from acceleration to...
  3. kverspoor

    position of accelerometers

    kashyap: There's no trigonometric way to divide one reading at 45° into horizontal and vertical components. I don't believe that there is any advantage to using only sensing in the 45° direction. More commonly, of course, people use vertical and horizontal as "standard." regards.. kv
  4. kverspoor

    Calcn. of Displacement, Velocity & acceleration

    Check out this downloadable conversion calculator also! http://www.wilcoxon.com/know_calculator.html Regards.. kv
  5. kverspoor

    Low Temp Shaft Material

    Does anyone have a suggestion for pump/motor shafting that will be exposed to "low temperature" (-130°C) fluid? Is there any reason to be concerned with using AISI 1045 or 4150? Any opinion appreciated. Thanks. Regards.. kv
  6. kverspoor

    Low Temp. Shaft Material

    Does anyone have a suggestion for pump/motor shafting that will be exposed to "low temperature" (-130°C) fluid? Is there any reason to be concerned with using AISI 1045 or 4150? Any opinion appreciated. Thanks. Regards.. kv
  7. kverspoor

    Railroad Car Vibration Testing

    Something's not adding up. I expected the displacement and acceleration to match at the beginning of the sweep (1Hz) and velocity and acceleration to match at the end of the sweep (14Hz). At 1Hz, 0.1 in pk-pk is equal to 0.01 G pk-pk (not G pk) and, at 14Hz, 0.45 ips pk equals 0.01 G pk (as...
  8. kverspoor

    Vortex Shedding on Lamp Poles

    Sorry for this late post but it seems to me that, while vortex shedding may excite lateral natural frequencies and the wind would provide a horizontal load, there may be some other action going on here. What about the torsional natural frequency(s) and/or acting in concert with residual...

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