Loading...

Tolerance Analysis and Dimensional Error Propagation in Truss Structures

Aghabeigi, Mostafa | 2012

767 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43674 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedy, Mohammad Reza
  7. Abstract:
  8. An analytical method is developed for description of the assembly process and dimensional error propagation in planar truss structures using two core concepts of “triangular unit cell” and “redundant member”.In order to clarify backbone of the developed method, its connections with other studies in the fields of tolerance analysis, robust design and structural optimization are discussed.Subsequently, triangular unit cell is defined as the basic element of internally determinate trusses and a suitable formulation is derived for calculating its dimensional error propagations characteristics.It is shown that having such a model for a single unit cell is sufficient for tolerance analysis of the entire structure.Utilizing the developed model, basic features of dimensional error propagation in truss structures are studied in detail. Moreover, it is shown that there exists an optimal configuration for which errors in position of nodes are minimized for a given set of member tolerances.Consequently the distinction between internally determinate and indeterminate trusses is explained using the concept of redundant members and a simple formulation is derived for determining dimensional errors in trusses possessing redundancy.Also, the role of redundant members in geometrical accuracy of structures is discussed using appropriate examples. In the final part of this Thesis some suggestions are made for future studies based on the developed method and also feasibility of expanding the proposed concepts to other engineering structures is demonstrated
  9. Keywords:
  10. Tolerance Analysis ; Truss Structures ; Assembly Tolerance ; Dimensional Error Propagation ; Robust Design

 Digital Object List

 Bookmark

No TOC