Mode Shapes in Compliant Mechanisms, and a Procedure to Identify Appropriate Pseudo-Rigid-Body Model Type
The mobility characteristics of compliant mechanisms are a function of the structural arrangement of the comprising segments and links, their types, as well as the load and/or displacement boundary conditions. It is hypothesized that an earlier defined concept of compliance number and stored strain energy in a compliant mechanism are strongly correlated. It therefore becomes necessary to define and better understand the characteristics of deformation mode shapes of compliant mechanisms. A compliant mechanism may exhibit a variety of mode shapes. In keeping with the classical mechanics notions, this paper systematically develops the mode shapes in compliant mechanisms, utilizing two distinct categories: i) segmental (elemental) mode shapes, and ii) mechanism (system) mode shapes. The possible mode shapes of the basic segment types are identified. Based on the energy storage capability of the segment types, segmental mode shapes are further classified into higher and lower order mode shapes. Similar identification is extended to compliant mechanisms as well, and the possible mechanism mode shapes are illustrated with the help of a few examples. Finally, the utility of this methodology in identifying an appropriate pseudo-rigid-body model (PRBM) corresponding to a given compliant mechanism is demonstrated. An experimental procedure AIDS in this process.
A. Midha and P. B. Prasanna, "Mode Shapes in Compliant Mechanisms, and a Procedure to Identify Appropriate Pseudo-Rigid-Body Model Type," Proceedings of the ASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (2015, Boston, MA), vol. 5A, American Society of Mechanical Engineers (ASME), Aug 2015.
The definitive version is available at https://doi.org/10.1115/DETC2015-47694
ASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, IDETC/CIE 2015 (2015: Aug. 2-5, Boston, MA)
Mechanical and Aerospace Engineering
Keywords and Phrases
Design; Mechanisms; Rigid structures; Strain energy; Classical mechanics; Displacement boundary conditions; Experimental procedure; Mobility characteristics; Possible mechanisms; Pseudo-rigid-body models; Storage capability; Structural arrangement; Compliant mechanisms
International Standard Book Number (ISBN)
Article - Conference proceedings
© 2015 American Society of Mechanical Engineers (ASME), All rights reserved.