Parametric Tolerance Analysis of Rigid Assemblies

Salehvesal, Amir Hossein | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40480 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedy, Mohammad Reza
  7. Abstract:
  8. In a mechanical system, dimensional and geometrical tolerances of components propagate kinematically through assembly and accumulate in a way that alters the critical dimensions of the assembly. Analysis of the accumulation of components tolerances and their influences on the critical dimensions of the assembly (design requirements) and also understanding the behavior of the entire system according to these effects is called tolerance analysis. Tolerance analysis is a key tool in quality improvement, cost reduction and profit growth, and it plays an important role in industrial productions. The Majority of mechanical systems are 3-Dimentional in nature, and approximating them as 2-Dimentional system may lead to significant errors in tolerance analysis. The objective of this thesis is to present a method for tolerance analysis of 3-dimentional rigid assemblies, both dimensionally and geometrically. The algorithms of this thesis are based on parametric method which defines dimensional and geometrical variations of a system based on geometrical entities such as points, lines, angles and surfaces. Both 2D and 3D techniques are developed and their differences are investigated, and the accuracy of the presented model is evaluated by presenting few examples. The specific practical example of this thesis is a Tilting Pad Journal Bearing which is modeled by the presented parametric method, and its results are discussed. Beside the worst case method, the statistical and the monte carlo methods are also used for accumulation analysis of the tilting pad example and the results of analysis are compared
  9. Keywords:
  10. Parametric Methods ; Journal Bearings ; Tolerance Analysis ; Three Dimentional Assembly ; Dimensional Tolerance ; Geometrical Tolerance

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