Modeling the boundary condition of edge connector used as PWB mount
MetadataShow full item record
Printed wiring boards (PWBs) are extensively used in electronic systems. In many instances they are subjected to dynamic loads, for e.g., in aerospace and automotive applications. The behavior of PWBs to vibration and shock depends on the way they are mounted in electronic boxes. Hence, accurate modeling of the mounting is necessary to predict the dynamic behavior of PWBs. PWBs are typically supported using wedge locks, screws, bolts or edge connectors. Each mount type offers different boundary conditions. During analysis, the mounts are modeled appropriately to simulate the boundary conditions they offer. Edge connectors are usually modeled as simple supports. This thesis investigates the representation of an edge connector as a combination of linear and torsional spring (LTS) to better simulate the boundary condition. The stiffnesses of linear and torsional spring are calculated based on the geometry of the contact of the edge connector. The LTS model was tested on aluminum and fiberglass epoxy beams and plates mounted between two identical edge connectors. The validity of the model was checked by comparing the analytical behavior of the systems with their experimental behavior. These results were also compared with the behavior predicted by representing the edge connector as simple support to ascertain the gains achieved by modeling the edge connector as a combination of linear and torsional spring rather than as a simple support. Results show that the LTS model predicts the behavior of systems better than the simply supported model. It is also shown that the gains accrued by the use of LTS model depend on the width of the PWB used in the system.