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2015 January 17

Bridge Design Contest 2015

Filed under: Uncategorized — gasstationwithoutpumps @ 12:07
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It looks like I won’t be playing with the bridge-design contest software this year.  I downloaded the software from https://bridgecontest.org/resources/download/, but was unable to run it.  They’ve made their software so that it only runs on Mac OS 10.7.3 or newer, but my MacBook Pro is running OS 10.6.8.  I suspect that there are a lot of schools out there running old Mac software also, so making the software run only on the new Macs is cutting out a lot of users (particularly in the less-wealthy school districts).  This is a common problem with software developers—because they invest in the latest hardware and software, they assume that everyone else is able and willing to do so.  More likely, they don’t even think about the number of people they cut out by writing programs that only run on recent computers, nor who those people are.

Note: there is a newer iMac in the household, and now that my son is in college I can get time on it, so I might install the bridge-design software there.

I know that I could also upgrade my 10.6.8 Mac (possibly even for free still), but I’ve heard from a number of students who did the upgrade last year or the year before, that the resulting laptop was far less reliable and much of their older software was broken by the “upgrade”.  I’m not willing to have to replace large swaths of my functioning software just to play one game. I’ll put up with the pain of major changes to the operating system the next time I replace the hardware.

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2014 December 8

Arana Gulch Multi-Use Trail Project Dedication

Filed under: Uncategorized — gasstationwithoutpumps @ 09:18
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According to  City of Santa Cruz : City Newsroom : Save the Date: Arana Gulch Multi-Use Trail Project Dedication January 14, the Broadway-Brommer bike bridge will finally be completed (it has taken about 20 years).

The ribbon cutting will take place 2–4pm on Wed 14 Jan 2015 at the Frederick Street end of the bridge. Unfortunately, I won’t be able to go, as it is sandwiched between the two classes I need to teach that day.

The City of Santa Cruz post linked to above gives details on the parking (car and bike parking) and planned entertainment.

 

2014 January 18

Engineering Encounters Bridge Design Contest 2014

Filed under: Uncategorized — gasstationwithoutpumps @ 23:23
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Last year’s bridge design did not work well for the 2014 Engineering Encounters Bridge Design Contest (formerly the West Point Bridge Design Contest):

Bridge design costing about $169.9k in the 2013 contest.  Note: I've deliberately distorted the picture to make it difficult to blindly copy the design, as I had problems with middle-school students using my published designs to cheat on their homework.  The truss design I have here can be used as inspiration, but not copied directly.

Bridge design costing about $169.9k in the 2013 contest.

When I tried a similar design in the West Point Bridge Designer 2014, I couldn’t get the cost below about $172k, but a simpler design was cheaper:

$167.3k bridge design for West Point Bridge Designer 2014.

$167.3k bridge design for West Point Bridge Designer 2014.

This design is currently 12 of 41 in the open contest, so clearly one can do better. I don’t expect it to stay high on the leaderboard for long.  It would already be much worse than that on the consolidated board, since the top 10 on the open board only fall in the top 50 on the consolidated one.

I think that the contest would be more interesting to me if they had provided an API for testing bridges.  Then the challenge would be to write bridge optimization software that explored the design space much more thoroughly and tweaked the designs.  It might be possible to do that this year, as the source code is available from sourceforge.  I’m not interested enough in the optimization problem to try to interface to their Java code, but it might be a good way to make a college-level version of the Bridge Designer Contest.

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2013 January 16

West Point Bridge Design Contest 2013

Filed under: Uncategorized — gasstationwithoutpumps @ 21:54
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I modified last year’s bridge to meet the constraints of this year’s West Point Bridge Design Challenge:

Bridge design costing about $169.9k in the 2013 contest.  Note: I've deliberately distorted the picture to make it difficult to blindly copy the design, as I had problems with middle-school students using my published designs to cheat on their homework.  The truss design I have here can be used as inspiration, but not copied directly.

Bridge design costing about $169.9k in the 2013 contest. Note: I’ve deliberately distorted the picture to make it difficult to blindly copy the design, as I had problems with middle-school students using my published designs to cheat on their homework. The truss design I have here can be used as inspiration, but not copied directly.
As of 2013 Jan 16, this design is number 3 in the “open competition”, but I’m sure it will slip a long way, as I don’t plan to do much (if any) tweaking.

I found it interesting that from this year’s version of the code they removed the options to change the viewpoint from which the bridge was viewed, though the included help system still describes the now-missing controls.

2012 September 12

West Point Bridge Design Contest 2012, again

Filed under: Uncategorized — gasstationwithoutpumps @ 16:34
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I revisited the West Point Bridge Design Contest today, and submitted a tiny modification of my previous design (not the one pictured in West Point Bridge Design Contest 2012, but the one I mentioned in the comments).

This design is currently 73rd of 1095 in the open listing, but does not look much like any of the standard templates.  It is rather “fragile” in the sense that moving any of the joints causes it to fail.

Bridge design costing about $157.6k in WPBD2012.

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