Snappability and singularity-distance of pin-jointed body-bar frameworks
This work provides a new intrinsic pseudometric for engineers to quantify the snappability of pin-jointed body-bar frameworks, which can aid in the design process of multistable mechanisms and compute singularity-distances for isostatic frameworks like Stewart-Gough manipulators.
This paper introduces a method to quantify the "snappability" of rigid pin-jointed body-bar frameworks, which describes their ability to snap between different physical realizations due to elastic deformations. The method uses the Green-Lagrange strain to calculate the total elastic strain energy density, providing an intrinsic geometric measure for comparison and design of multistable mechanisms.
It is well-known that there exist rigid frameworks whose physical models can snap between different realizations due to non-destructive elastic deformations of material. We present a method to measure this snapping capability based on the total elastic strain energy density of the framework by using the physical concept of Green-Lagrange strain. As this so-called snappability only depends on the intrinsic framework geometry, it enables a fair comparison of pin-jointed body-bar frameworks, thus it can serve engineers as a criterion within the design process of multistable mechanisms. Moreover, it turns out that the value obtained from this intrinsic pseudometric also gives the distance to the closest shaky configuration in the case of isostatic frameworks. Therefore it is suited for the computation of these singularity-distances for diverse mechanical devices. In more detail we study this problem for parallel manipulators of Stewart-Gough type.