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Undergraduate Research Project Management System

Design of Three-Dimensional Precision Positioning Compliant Mechanism

Status Complete
Seeking Researchers No
Start Date 09/01/2007
End Date 06/30/2007
Funding Source Undergraduate Research Grants
Funding Amount
Community Partner
Related Course
Last Updated 07/05/2008 01:25AM
Keywords Compliant Mechanisms

People

Faculty
  Nicolae Lobontiu

Student Researchers
  Paul Bilodeau

Abstract

The project aims at developing a three-dimensional, three degree-of-freedom compliant mechanism for precision positioning. The mechanism design will be based on analytical and finite element modeling and simulation, followed by wire electro-discharge machining of the actual device and experimental testing. This project considers expanding the knowledge gained while working on developing a two-stage planar mechanical-motion amplification compliant device. Compliant mechanisms, which employ the deformation of elastic members (flexure hinges) to transmit mechanical motion, are increasingly implemented in small-scale applications such as micro/nano electromechanical systems (MEMS/NEMS) or macro-scale precision devices. The three-dimensional precision-positioning mechanism will consist of three identical actuator units, each formed of a flexible frame and a linear actuator, either piezoelectric or voice-coil. Various compliant frame designs will be considered and an optimized variant will be selected to provide the maximum displacement amplification. The design phase of this basic unit will be a three-tier effort, as it will use simplified (lumped-parameter) modeling, analytic modeling and finite element analysis. Simulations will be performed that will also take into consideration the presence of the linear actuator and the corresponding change in stiffness. The actuation frames will be machined by a specialized company, based on CAD-generated production drawings. The final actuation stage and full mechanism assembly, as well as the experimental testing, will be performed in the School of Engineering's labs at UAA. The experimental testing will first investigate the performance of individual stages in realizing the model-predicted motion amplification, followed by checking of the overall mechanism capability of producing smooth three-dimensional motion within a one millimeter-side cube envelope. A comparison between theoretical models and experimental data will allow assessing quality of model predictions against fabrication/measurement errors.

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