Conceptual Insightful Synthesis of Spatial Compliant Mechanisms using the Load Flow Formulation

[+] Author and Article Information
Girish Krishnan

117 Transportation Building 104 S Mathews Ave Urbana, IL 61801-2925 gkrishna@illinois.edu

Sreekalyan Patiballa

104 S Mathews Ave 117 Transportation Bld Urbana, IL 61809 patibal2@illinois.edu

1Corresponding author.

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the Journal of Mechanical Design. Manuscript received December 28, 2018; final manuscript received July 25, 2019; published online xx xx, xxxx. Assoc. Editor: Hai-Jun Su.

ASME doi:10.1115/1.4044431 History: Received December 28, 2018; Accepted July 26, 2019


Conceptual design of spatial compliant mechanisms with distinct input and output ports may be hard because of its complex interconnected topology, and is currently accomplished by computationally intensive automated techniques. This paper proposes a user insightful method for generating conceptual compliant topology solutions. The method builds on recent advances where the compliant mechanism deformation is represented as load flow in its constituent members. The nature of load flow enables functional decomposition of compliant mechanisms into maximally decoupled building blocks namely a Transmitter member and a Constraint member. The proposed design methodology seeks to synthesize spatial compliant designs by systematically combining transmitter-constraint members by first, identifying kinematically feasible transmitter load paths between input(s) and output(s), and then selecting appropriate constraints that enforce the load path. The paper proposes four design steps to generate feasible solutions and four additional guidelines to optimize load paths and constraint orientations. The method is applied with equal ease to three spatial complaint mechanism examples that belong to single-input single-output, multiple-input single output, and single-input multiple-output mechanisms.

Copyright © 2019 by ASME
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