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  1. kacstic

    Fan box too noisy

    You should also check the spec again and see if they want an A-weighted decibel level of 45dB. If you are measuring the noise with flat-weighting, then another measurement with A-weighting would like bring the noise level down under the required spec, especially if the noise is mostly low to...
  2. kacstic

    M+P vibration control systems

    If you are taking measurements at specific intervals over a period of time (like 1min intervals for 8 hours), then the software averages the measurement over the interval time (in our example, 1min). Most software will then output an equivalent level that is also averaged throughout the entire...
  3. kacstic

    Reducing noise from a grinder

    Tmoose provided an alternative approach that could be attacked easily. The noise emitting by your grinder could be causing your grinder panels to act as essentially loudspeakers. In order to decrease their vibrations, you increase their resonant frequencies about 1.4 times the predominant...
  4. kacstic

    Element Orientation Vector

    Thanks! Those references helped my understanding a little more. Also the visualization of the orientation vector was helpful.
  5. kacstic

    Element Orientation Vector

    I have read that part but it is no help, unless I am reading the wrong one. Do you know of a better reference source than the one NEiNastran supplied? Thanks!
  6. kacstic

    Element Orientation Vector

    I just started using NEiNastran v9.02 recently and for practice, i am modeling basic line models (steel beam structure for example). When I mesh each line (or curve), I designate the material, beam cross section, and then it asks for the element orientation vector. I presume this is to identify...

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