Flexure Characterization and Design

Overview

Flexures are deformable solid bodies used to connect elements in a mechanical system. This flexibility allows for greater freedom of motion of the parts relative to each other than a rigid joint does, but at the cost of complicating the dynamics of the system. As one can imagine, it is important to know the properties of the flexures in order to predict and control the behavior of a system. This project is primarily focused on the flexures used in the PPOD projects in LIMS which are used to connect the linear actuators to the table. In this case the flexures allow the table to move in all six degrees of freedom (three translational and three rotational) which the use of rigid joints would not allow.

Current Design

The flexures currently on the PPOD are made of a 1/4" Tygon tubing glued to aluminum mounts. However, only a simple approximation has been used to describe them when modeling the system.

The goals of this project are to be able to test the performance of existing flexures and to use this information to design new flexures to improve the performance of the PPOD.