From: Larry Sayre 
To: mdholm{at}telerama.com
CC: atm{at}shore.net
Reply-To: Larry Sayre 


mdholm{at}telerama.com wrote:

>Larry,
>
>The 27 point setup below gives 2.50893e-06 mm RMS (about 1/200 wave) and
1.637e-
>05 mm P-V (about 1/30 wave) residual deformation.  This isn't bad, and it is
>better than I got with a quick run of John Dudgeon's 36-point setup.  This was
>obtained from the "stock" 27 point setup in Plop with varying angles.
>
>Mark Holm
>mdholm{at}telerama.com
>
>;This is a 27 point cell with all angles allowed to vary
>;The supports are arranged symmetrically in pairs about a single ring
>;of three supports. This ring of three supports is located at r3. The
remaining
>8
>;rings are in pairs at r0, r1, r2, and r4. The angles they are located at
>;are da0, da1, da2, and da4 on either side of the ring of three supports
>;at radius r3.
>var r0  0.338475
>var r1  0.824307
>var r2  0.771943
>var r3  0.627517
>var r4  0.762267
>var da0  33.6882
>var da1  14.4994
>var da2  50.7276
>var da4  34.7321
>var a0p  60 + da0
>var a0m  60 - da0
>var a1p  60 + da1
>var a1m  60 - da1
>var a2p  60 + da2
>var a2m  60 - da2
>var a4p  60 + da4
>var a4m  60 - da4
>diameter 762
>thickness 40
>focal-length 3048
>n-mesh-rings 20
>rel-support-radii r0 r0 r1 r1 r2 r2 r3 r4 r4
>num-support 3 3 3 3 3 3 3 3 3
>support-angle a0p a0m a1p a1m a2p a2m 60 a4p a4m
>basis-ring-size 3
>basis-ring-min 0
>obstruction-diam 127
>optimize r0 0.01
>optimize r1 0.01
>optimize r2 0.01
>optimize r3 0.01
>optimize r4 0.01
>optimize da0 1
>optimize da1 1
>optimize da2 1
>optimize da4 1
>part triangle 3 point 6 0 point 2 0 point 3 0
>part triangle 3 point 0 0 point 4 0 point 7 0
>part triangle 3 point 1 0 point 5 0 point 8 0
>part triangle 3 part 0 0 part 1 0 part 2 0
>
>
>
Mark,

This is essentially identical to what I got from PLOP when I ran it for a
27 point cell.  This is what I will build, as the consensus is that it is
totally adequate for the job.

Thanks,
Lawrence Sayre

--
My philosophy, in essence, is the concept of man as a moral being, with his
own happiness as the moral purpose of his life, with productive achievement
as his noblest activity, and reason as his only absolute.

Ayn Rand (in the appendix to 'Atlas Shrugged')

--- BBBS/NT v4.00 MP