Why symmetry?

Most of engineering creations are symmetrical. Why?

Symmetrical engineering design: it?s easier to calculate and draw (sometimes to build).

But if you look out of the window ? world is asymmetrical: Solar system, Earth, Mountains and Valleys, Animals, Trees and Grasses.

The only problem is: how to find this optimal solution without implementing symmetry (if you implement something ? you implement restrictions and get less effective solution).

Genetic algorithms for optimization of space and plane frames generate structures and give the answer and solution.

You may see examples of optimized asymmetrical structures

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Stullia Soft

Aeroplanes, ships, cars are symmetric in the exterior for the same reason that birds, fish and cats are symmetric: it costs fuel to correct for asymmetry. Engines have asymmetry in their shaft arrangement, fairly similar to the solar system. Buildings have symmetry because many people like it for esthetical reasons; industrial plant lay-outs normally show no sign of any symmetry.

Timo

"Stullia" schreef in bericht news:c5so18$5e0v0$ snipped-for-privacy@ID-128000.news.uni-berlin.de...

implementing

Not all planes and cars are symmetrical. Rutan has a couple of planes that are assymetric, but he did it for a reason, not just to be different. In one case it was to keep gun gasses out of the inlet, in the other case it was to allow a second engine without too much single engine control authority requirement.

But if you ask "why not?" I would respond "why bother?". even evolution has assymetric animals (fiddler crabs) - fish even (flounder, sole etc) - but only for a good reason.

Also cars are rarely symmetrical, one of the ca 1980s small Renaults had no wheel in line with another, in X or Y.

Cheers

Greg Locock