In modeling flexure based mechanisms, generally flexures are modeled perfectly aligned and nominal values are assumed for the dimensions. To test the validity of these assumptions for a two Degrees Of Freedom (DOF) large stroke compliant mechanism, eigenfrequency and modeshape measurements are compared to results obtained with a flexible multibody model. The mechanism consists of eleven cross flexures and seven interconnecting bodies. From the measurements 30% lower eigenfrequencies are observed than those obtained with the model. With a simplified model, it is demonstrated that these differences can be attributed to wrongly assumed leaf spring thickness and misalignment of the leaf springs in the cross flexures. These manufacturing tolerances thus significantly affect the behavior of the two DOF mechanism, even though it was designed using the exact constraint design principle. This design principle avoids overconstraints to limit internal stresses due to manufacturing tolerances, yet this paper shows clearly that manufacturing imperfections can still result in significant different dynamic behavior.
|Title of host publication||ECCOMAS Multibody Dynamics 2013, 1-4 July, University of Zagreb, Croatia|
|Place of Publication||Zagreb|
|Publication status||Published - 1 Jul 2013|
|Event||Multibody Dynamics 2013: ECCOMAS Thematic Conference - Zagreb, Croatia|
Duration: 1 Jul 2013 → 4 Jul 2013
|Conference||Multibody Dynamics 2013|
|Period||1/07/13 → 4/07/13|
Wijma, W., Boer, S., Aarts, R. G. K. M., Brouwer, D. M., & Hakvoort, W. (2013). Modal measurements and model corrections of a large stroke compliant mechanism. In ECCOMAS Multibody Dynamics 2013, 1-4 July, University of Zagreb, Croatia (pp. 831-843). Zagreb: ECCOMAS.