Geodesic
A Method for Generating Compound Spring Element Curves in Contact with Cylindrical Surfaces
Journal for geometry and graphics, Tome 3 (1999) no. 1, pp. 067-076.

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This paper describes a method for enhancing the initial design process, as well as the transfer of data, for the geometry of compound contact springs. A force-length constrained model is developed around a cantilever beam section which has short (less than 10% of the beam's length) structural elements to facilitate proper positioning. The short elements are often considered insignificant in deflection analysis, but are shown to contribute an additional 26% to the structure's deflection. Once this is done, a mount position constrained model is developed which must be solved iteratively. The resulting geometry is smooth, precise, and can be readily transferred to CAD to complete a robust design process. 
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     author = {M. J. Keil and J. Rodriguez},
     title = {A {Method} for {Generating} {Compound} {Spring} {Element} {Curves} in {Contact} with {Cylindrical} {Surfaces}},
     journal = {Journal for geometry and graphics},
     pages = {067--076},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/JGG_1999_3_1_a5/}
}
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M. J. Keil; J. Rodriguez. A Method for Generating Compound Spring Element Curves in Contact with Cylindrical Surfaces. Journal for geometry and graphics, Tome 3 (1999) no. 1, pp. 067-076. http://geodesic.mathdoc.fr/item/JGG_1999_3_1_a5/