Rossiter, Adrian: Difference between revisions

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=Springs=
Read here about a significant person in tensegrity research.
A spring is an elastic object used to store mechanical energy. Springs are usually made out of hardened steel. Small springs can be wound from pre-hardened stock, while larger ones are made from annealed steel and hardened after fabrication. Some non-ferrous metals are also used including phosphor bronze and titanium for parts requiring corrosion resistance and beryllium copper for springs carrying electrical current (because of its low electrical resistance).
The rate of a spring is the change in the force it exerts, divided by the change in deflection of the spring. That is, it is the gradient of the force versus deflection curve. An extension or compression spring has units of force divided by distance, for example lbf/in or N/m. Torsion springs have units of force multiplied by distance divided by angle, such as N·m/rad or ft·lbf/degree. The inverse of spring rate is compliance, that is if a spring has a rate of 10 N/mm, it has a compliance of 0.1 mm/N. The stiffness (or rate) of springs in parallel is additive, as is the compliance of springs in series.
Depending on the design and required operating environment, any material can be used to construct a spring, so long the material has the required combination of rigidity and elasticity: technically, a wooden bow is a form of spring.
==The Use of Springs as Tension Elements in Tensegrity==


Many tensegrity explorers use springs as tension elements.
=Bio=
Adrian Rossiter maintains the Antiprism polyhedra visualization software, website and email list. He resides in El Puerto de Santa María.


[[file:6_strut_with_springs.jpg|thumb|500px|none|6 strut tensegrity with springs as tension members. Attribution unknown, from Energy Medicine Powerpoint compiled by B. Lowry"]]
=Antiprism software=
Antiprism software for for geometry visualization was developed for Adrian's personal use. as an aid to understanding and exploring ideas in geometry. It main focus is on high quality visual results, and not on precise numerical solutions, though the coordinate data for the models is usually highly precise.


==Springs as a Model for Energy Storage in Biological Tensegrity==
Rossiter has made the Antiprism programs open source under the MIT License, or similar permissive licences. Development can be followed through the Antiprism Git Repository.
The Antiprism List can be used to ask for support, give feedback, or generally discuss the Antiprism programs.


Tendons and bone can store large amounts of energy and return it like a spring in leaps and bounds. The best model for visco-elastic behavior of biologic tissues is the non-Hookean spring and dashpot. This models the elastic behavior is natural to most biologic tissue.
Rossiter's work is found in other pages of this wiki, for example he helped analyze the [[540 Struts|92 Prism tensegrity]].
When such tissue is initially stressed it behaves almost like the surface of a liquid at low and moderate strains. It then rises in its very characteristic, non-Hookean, 'J' response. Mathematically, this is the only sort of elasticity that is completely stable under the fluid pressures at high strains found in blood vessels, alveoli, bladders, bowels, muscles, uteri and most other biologic soft tissues. The properties imparted by this curve are flexible and tough. With this configuration, biologic tissue unlikely to fracture, explode or be prone to aneurysm formation. [1]
===Links and References===


[1] Textbook of Musculoskeletal Medicine, Hutson, M & Ellis, R (Eds.), Oxford, Oxford University Press. 2006
=Image Gallery=


[[Category:Portal to Model Making]]
Adrian built many tensegrities that express standard polyhedra. The struts are pairs of barbecue sticks wired together, forming a strut-long groove. The photos are on his website. He often names the tensegrities after the polyhedra that their outline conforms to.
 
Below, a few samples:
 
[[file:30_strut_icosidodecahedron_Adrian_Rossiter_tens_30b_Lrg.jpg|thumb|500px|none|30 strut icosidodecahedron. Construction and photo by Adrian Rossiter.]]
 
 
=Links and References=
 
Main website, http://www.antiprism.com
 
Sample model on website, http://www.antiprism.com/album/835_tens_models/index.html
 
[[Category:Portal to polyhedra]]
[[Category:t-person]][[Category:p-software-developer]]

Revision as of 07:58, 1 April 2019

Read here about a significant person in tensegrity research.

Bio

Adrian Rossiter maintains the Antiprism polyhedra visualization software, website and email list. He resides in El Puerto de Santa María.

Antiprism software

Antiprism software for for geometry visualization was developed for Adrian's personal use. as an aid to understanding and exploring ideas in geometry. It main focus is on high quality visual results, and not on precise numerical solutions, though the coordinate data for the models is usually highly precise.

Rossiter has made the Antiprism programs open source under the MIT License, or similar permissive licences. Development can be followed through the Antiprism Git Repository. The Antiprism List can be used to ask for support, give feedback, or generally discuss the Antiprism programs.

Rossiter's work is found in other pages of this wiki, for example he helped analyze the 92 Prism tensegrity.

Image Gallery

Adrian built many tensegrities that express standard polyhedra. The struts are pairs of barbecue sticks wired together, forming a strut-long groove. The photos are on his website. He often names the tensegrities after the polyhedra that their outline conforms to.

Below, a few samples:

30 strut icosidodecahedron. Construction and photo by Adrian Rossiter.


Links and References

Main website, http://www.antiprism.com

Sample model on website, http://www.antiprism.com/album/835_tens_models/index.html

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