Title page for ETD etd-05142002-135746


Type of Document Master's Thesis
Author Moutran, Serge Riad
Author's Email Address smoutran@vt.edu, sergemoutran@yahoo.com
URN etd-05142002-135746
Title Feasible Workspace for Robotic Fiber Placement
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Sturges, Robert H. Committee Chair
Reinholtz, Charles F. Committee Member
Suchicital, Carlos T. A. Committee Member
Keywords
  • feasible workspace
  • path verification
  • fiber placement
  • trajectory simulation
Date of Defense 2002-05-10
Availability unrestricted
Abstract
Online consolidation fiber placement is emerging as an automated manufacturing process for the fabrication of large composite material complex structures. While traditional composite manufacturing techniques limited the products’ size, geometrical shapes and laminate patterns, robotic automation of the fiber placement process allows the manufacture of complex bodies with any desired surface pattern or towpreg’s direction. Therefore, a complete understanding of the robot kinematic capabilities should be made to accurately position the structure’s substrate in the workcell and to compute the feasible product dimensions and sizes.

A Matlab algorithm is developed to verify the feasibility of straight-line trajectory paths and to locate all valid towpreg segments in the workspace, with no focus on optimization. The algorithm is applied preliminary to a three-link planar arm; and a 6-dof Merlin robot is subsequently considered to verify the towpreg layouts in the three-dimensional space. The workspace is represented by the longest feasible segments and plotted on parallel two-dimensional planes. The analysis is extended to locate valid square areas with predetermined dimensions. The fabrication of isotropic circular coupons is then tested with two different compaction heads. The results allow the formulation of a geometric correlation between the end-effector dimensional measures and the orientation of the end-effector with respect to the towpreg segments.

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