Dear Peregrine experts,
First of all, I wanted to thank LimitState for providing such an early technology demonstrator and for their interest in providing free academic versions.
I´m obtaining a very high optimised mass and too thick members for some simple load case. Briefly, I´m trying to optimise a 1 m long truss that is axially loaded with 24 kN compression force (about 2450 kg) and pinned at both ends. However, using standard steel material properties (Stiffness: 210 GPa, Strength: 355 (both compression and tension), Poisson: 0.3, and Density: 7850 kg/m^3) I obtain an abnormally high volume of 7.11211·10^7 mm^3, i.e. around mass around 558 kg, and really thick members. This is simply senseless… Would you check what´s wrong? TrussTest.gh (33.4 KB)
I´ve checked that Rhino units are “meters” and ProbSpec´s Unit output says “m”, so both seem to be the same. I´m running Rhino version 6 SR11 (6.11.18275.16081, 10/02/2018), Grasshopper version Tuesday 02 October 2018 16:04 Build 1.0.007, and Peregrine 220.127.116.1143.
Would it be some kind of issue in units management between Rhino and Peregrine? Or, more likely, am I doing something wrong?
By the way, the text in dialog boxes (those that appear upon double-click in e.g. “ProbSpec” object) appears partially hides the input field box. For example, the Effective Euler buckling length is hidden in my display, and I can just barely see the Euler Buckling checkbox. I´ve observed that something similar happens for “Mat” object.