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  • Users: Boothby171
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  1. Boothby171

    Odd response running load combinations...

    I have a relatively simple model in RISA-3D. No "tension only" members. No "Euler Buckling" members. Spring constraints and some RIGID members, though. It's got a few HUNDRED load combinations, and I'm trying to run ONE, using the "Solve Current Combination" command. So far, so good...
  2. Boothby171

    Buckling in telescoping hydraulic cylinders

    I started to examine a multi-stage telescoping hydraulic cylinder for Euler buckling (it actually is rigidly mounted at its base stage, and has side loads as well, so there are interaction equations to be dealt with), when I realised something important. My "d'oh" moment of the day. The walls...
  3. Boothby171

    Position = FUNCTION(VELOCITY, ACCELERATION, JERK)

    Does anyone have a reference for equations of motion for an S-Curve? I'm looking for triangular acceleration ramps (step jerks), and eventually want to be able to calculate the force (acceleration) and therefore the power required to get a piece from point (a) to point (b) in a known time, with...
  4. Boothby171

    I'm hoping that this is not typical corporate behavior...I guess

    I've been at my current company for about 4 years, and this particular problem has come up once or twice before. But I've had enough, and I don't think I'm going to take it any more. I was recently involved in a project that suffered from a cost overrun. After talking to the client, I agreed...
  5. Boothby171

    Fastener with a calibrated shear break point?

    I'm looking for a fastener or pin that can be purchased with a known shear fracture point. I say fracture instead of failure because yielding is not enough. I need it to break into two pieces. I need a relatively accurate fracture value (+/- 5%), as it is for an indusatrial robotic...
  6. Boothby171

    Looking for references on Centripetal (Centrifugal) habitation wheels.

    I'll be giving a presentation in March, 2004 for the ASCE "Earth and Space" conference, on methods of transit between fixed and centripetally rotating sections of (far future) spaceships and space stations. I'm looking for pointers to current thoughts & papers on rotating human...
  7. Boothby171

    Working Model 4D: Sliding down a rope

    I'm using Version 7.1 of MSC.Visual Desktop (Working Model 4D), and I'm trying to model an oblect as it slides down a rope. The rop is terminated at two high points, and has a sag. The object starts from one of the high points, and slides down along the rope's length. Oh, and the rope's...
  8. Boothby171

    Can't review previous analyses in STAAD PRO--even with the key

    After downloading and installing the 62 MB patch to upgrade my STAAD PRO 2001 to build 1006, and then installing the new US/Aluminum Code Check executable to fix a problem with STAAD reporting tension in members that were actually undergoing compression, and then having to receive a new HASP key...

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