Need help about using Kangaroo for form finding

Replies to This Discussion

Permalink Reply by peter fotiadis on June 21, 2016 at 4:44am

BTW: It's imperative to get the gist of the freaky thing anchored at the patio "lips":

1. The green is fixed always "vertical" (but old patios can't withstand such forces ... thus the whole T truss "concept" is kinda 3rd marriage).

2. The red (and some other things) secures in place a ball pivot join.

3. The blues "pivot" in such a way that allows the 3 cables to meet the equivalent 2 part strut co-linear combo (the bottom is part of the T truss, the upper is the extension going to meet the roofing alignment tube grid).

Whiteout a "pivoting" mount system that allows differentiation between a vertical plane and the one defined by the 3 cables ... you wouldn't be able to fix anything.

 

Permalink Reply by Zhengyu Xue on June 21, 2016 at 5:30am

I would prefer to make a pure tensegrity if I knew it could be done in your way from the beginning..

Permalink Reply by peter fotiadis on June 21, 2016 at 9:08am

Er ... hmm ... this thingy is "pure" T:

1. The T truss is a pure TT (T for thing) since (a) all tension forces are taken via cables (b) all compression forces ... blah, blah (c) the tension members "engulf" the compression ones (rule N1).

2. The extension (roof supporting) part is a semi TT ... IF you take into account the alignment mini beams but this is unavoidable I'm afraid. Plan B: remove the roof, save "some" dollars and have umbrellas ready. Plan C: remove the TT and invest on anti-gravity.

Moral: glass half empty or half full? Who cares? (and who's able to tell the difference?)

Permalink Reply by Zhengyu Xue on June 21, 2016 at 5:19am

Sensei,

Most are clear but there are still two questions.

First, as shown in the figure I attached, large bending occurs in the upper connection point on struts. I don't care about torque, But I need the strut to be fixed to take this bending. Therefore, pivot connection which allows rotation does not fulfil my needs.

Second, about the green plate, do you mean this to be connected with the hoop? But why third marriage? Or in the post from 2.4, all the slim lines are cables? Then you made a pure tensegrity.

Plus, 'A rich girl equals to 1000 poor girls' reminds me that in ancient China, there is only one empress,but the emperor has about 3000 girls in his palace.. Indeed the 1/3000 empress should taken 1/3 of the king's nights....

May the battle end with a good win,

Daniel Radcliffe

Permalink Reply by peter fotiadis on June 21, 2016 at 5:46am

Dear SenseiLessFighter

Let's forget for a moment the peripheral fixing policy (that's the easy bit).

Struts are ALWAYS pairs: the lower is the rigid T member and his extension is the part that does the roofing job: let's call it upper.  In some cases the lower is rather short ... thus think rather a node-to-node "spacer" than a typical strut.

0. Let's call nodes (upper/lower) the pts that define the "lens" type of T truss. ANY node except the peripheral ones carries a disk and the #@^# ball-pivot join.

1. ANY upper strut is "freely" connected with the upper disk (that holds the U/V cables (and the diagonal ones) in place). It is also connected with the lower one (via a feeble nut: this is used ONLY for alignment and can't support the strut in place by ANY MEANS).

At this point Q1 for you: what to get?? the humble baby Panigale or the S variant?

2. Any (well ... almost) upper strut is "fixed" in place due to 4 cables starting from the equivalent U-Joint and ending north, south, east, west with regard the neighbor (upper) nodes.

3. What means almost? it means that every 2nd strut (in U/V) there's no cables since the job for securing the strut in place is carried over via the alignment roofing tubes.

At this point Q2 for you: what color?

4. Therefor and due to these @#$%@#$ cables (and the tubes: see 3) pivot DOESN'T yield any "bending" issue provided that the strut diameter is sufficient enough (try carbon as well > tres a la mode).

At this point Q3 for you: what are you going to do with the ugly side exhaust? (the baby Panigale lacks the stunning under the sump pipework of the big one - but in the US market this is addressed properly).

Moral: All what matters is to answer correctly the 3 questions (forget T trusses and stick to things that matter).

Permalink Reply by peter fotiadis on July 25, 2016 at 5:52am

For your graduation and the truly excellent thesis I offer you the ultimate gift: a modular cogitation controller (shown in basic configuration [front part not included]) that can safely guide you into the unknown in the years to come.

Bravo

Permalink Reply by Zhengyu Xue on July 25, 2016 at 6:07am

Aha, seems like the same series as your Jedi helmet.

Different stages: concrete- bronze- silver- gold- diamond- Jedi...

I like it. And I really appreciate your inspiration and support.

Indeed what you taught me can guide me through the knowns and unknowns.

I will keep learning, moving, fighting.

To make a difference to the little world.

You are a great Shifu.

Wish you all the best.

Zhengyu

Permalink Reply by peter fotiadis on July 26, 2016 at 12:50am

BTW: This (maybe) doesn't require diagonals (cross fingers in the event of earthquakes) but is not radially deployed AND is a very small thingy anyway (my flying dwarfs always available on request for cleaning):

Moral: killing a bazooka with a mosquito

• ‹ Previous
• 1
• …
• 5
• 6
• 7
• Next ›
• Page