40.1.2.1. Additional Spring Information

Figure 40.12 Additional Spring Property Information dialog box

\(G=\frac{E}{2\left( 1+v \right)}\)

\({{k}_{first/last}}=\frac{G{{r}_{x}}{{r}_{z}}\left( r_{x}^{2}+r_{z}^{2} \right)}{4R_{m}^{3}{{n}_{segment}}}\ \ \ \ for\ i=1\ and\ i=nu{{m}_{total\_segments}}\)

\({{k}_{middle}}=\frac{G{{r}_{x}}{{r}_{z}}\left( r_{x}^{2}+r_{z}^{2} \right)}{8R_{m}^{3}{{n}_{segment}}}\ \ \ \ for\ i=2,...,nu{{m}_{total\_segments}}\)

where,

\(G\) : Shear Modulus, \(E\) : Young’s Modulus, \(\nu\) : poisson’s ratio (\(E\) and \(\nu\) are from material library)

\(i\) : body sequence

\(k\) : TDSA stiffness

\({{r}_{x}}\) : Horizontal radius of section

\({{r}_{z}}\) : Vertical radius of section

\({{R}_{m}}\) : mean coil radius

\({{n}_{segment}} : \frac{Number\ of\ active\ coils}{Total\ number\ of\ segments}\)

• Body Property

  • Material Type

  • Use the auto-calculation for the shear modules

  • Shear Modulus

• TSDA Property

  • Use the auto-calculation for the TSDA stiffness

  • Stiffness

  • Damping