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Recent content by StuartTHannah

  1. StuartTHannah

    HASS FIXTURE DESIGN

    We are about to begin HASS testing of electronic products and as such are being required to design appropriate fixturing. Not being familiar with the approach to the design of such items, any guidance would be most appreciated. Up until now the majority of our work has been based around...
  2. StuartTHannah

    Metric Torque Values

    Is anybody aware of a table of torque values for common metric fasteners - m2 - m12 available on the internet?
  3. StuartTHannah

    Damping Coefficient

    I am currently involved in analysing dynamic effects (shock,vibration) using Pro Mechanica as my calculation tool. During the setup of the analyses I am being asked to input a % Damping coefficent for the material/material combination under test. Is anyone aware of literature detailing this data...
  4. StuartTHannah

    Underwater Shock

    The input excitations taken from naval specs were derived from actual tests carried out in the 60's/70's, measured by placing accelerometers around the vessel. Can I ask would you expect given this situation to see a sinusoid with the natural frequency of the ships hull. Furthermore could you...
  5. StuartTHannah

    Underwater Shock

    Thanks Greg, I agree with your view on the above, however my initial statement was purely based upon my experience (which isn't a lot) of working with Military standards. When performing a dynamic analysis naval vessels,a shock input, normally a specific frequency damped sinusoid, is used as...
  6. StuartTHannah

    Underwater Shock

    Need some help understanding the reality of underwater shock. Have done some Modal analysis on the subject above and come up with a number of conclusions/assumptions can someone set me straight. I am aware that when an explosive device goes off underwater a pulsing gas bubble is created which...
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