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Recent content by rickfischer

  1. rickfischer

    Using *VOPER for vector multiplication

    The transpose is found with the *MFUN command: *DIM,UT,,1,100 *MFUN,UT(1),tran,U(1)
  2. rickfischer

    help regarding material selection and tolerance design

    Material selection will be based mostly on loads, environment, and cost factors. The need for tight tolerances will be addressed more with molding process, and hence part design, and mold design. Having said that, you suggested a poor material. Nylon is hydroscopic, meaning it will absorb...
  3. rickfischer

    Damping Ratio for Secondary System

    Thanks for the reply. Since my original post, I found NUREG/CR-6919, "Recommendations for Revision of Seismic Damping Values in Regulatory Guide 1.61", . This paper gives recommendations for damping ratios for structures, piping, HVAC ducts, mechanical and electrical equipment, etc. This can...
  4. rickfischer

    Damping Ratio for Secondary System

    What is an appropriate damping ratio for use in a seismic analysis of a secondary system? The device is a sheetmetal cabinet assembled sometimes by welding but mostly with threaded fasteners.
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