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Zig-Zag Tensegrity Cube Datasheet


Copyright © 2003 by Bob Burkhardt

        Member Descriptions
        [name, end point names, weight (if in objective function),
        second power of length (if a constraint), member category,
        Obj/Con/Exc (put in objective function, use as a constraint or
        exclude from computations), flags]
        For assembly purposes, only the name and end point names are
        of interest.  The other information may be of interest after
        A Practical Guide to Tensegrity Design has been consulted.

<Member> strut  pt2  pt3  0.0 1.0      1 Con CalcClear Inelastic *
<Member> triten pt1  pt2  0.0 sqr(1/3) 2 Con CalcClear *
<Member> zzten  pt1  pt5  1.0 0.0      3 Obj CalcClear *


        In-Situ Member Lengths
        These are the lengths of the members when they are in place
        and prestress is applied.  The strut lengths are from
        screw-eye center to screw-eye center, as are the tendon lengths.
        The values are in model units.

    strut:            1    triten:     0.333333     zzten:     0.447433


        Relative Member Force Magnitudes
        These values are useful for developing an assembly
        strategy for the structure.  The tighter tendons are much
        easier to tie in place early on, while the looser tendons
        can be left to the last.  This information is also used
        to adjust tendon lengths since the measured length of a tendon
        will be shorter for a highly-stressed tendon with the same
        in-situ length as a tendon which is not so stressed.

    strut:    -0.456353    triten:     0.768471     zzten:     0.447433


        Construction Lengths (in millimeters and halves)
        The construction length of a tendon is less than the in-situ
        length since when the tendon is measured off it isn't under
        any prestress force.  The construction length for the strut
        represents the length of a 5/16-inch-diameter wooden dowel.
        The tendons can be made of braided nylon fishing line.
        Prestress forces were assumed not to affect strut lengths.
 
        Elongation of Tendon of Unit Cross Section
        Under Force of Average Magnitude (fraction)> .02
        Length Scale Factor> 212
        Strut and Tendon Hub Adjustments - s;t> 7.5 3.5
        (The 7.5 mm adjustment for the strut is the amount
         the screw-eye center extends from the dowel.  The 3.5 mm
	 adjustment for the tendon is half the outer diameter of the
         screw eye.)
 
    strut: 197 0    triten:  62 0     zzten:  86 1

ray trace of zig-zag tensegrity cube
Zig-Zag Tensegrity Cube with Point Labels
(The point labels coincide with the ones listed above.
There are some extra labels as well for points that aren't listed above.)

structure file:  cube/zigzag1.rc
 variable file:  cube/zigzag1.dat
    digit list:  src/mm.dls

CONTACT:

Bob Burkhardt
Tensegrity Solutions
Box 426164
Cambridge, MA 02142-0021
USA

e-mail: bobwb@juno.com

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