scholarly journals Three-Dimensional Assembly Tolerance Analysis Based on the Jacobian-Torsor Statistical Model

2017 ◽  
Vol 95 ◽  
pp. 07007 ◽  
Author(s):  
Heping Peng ◽  
Wenlong Lu
Keyword(s):  
Statistical Model ◽  
Three Dimensional ◽  
Tolerance Analysis ◽  
Assembly Tolerance

Computer Aided Tolerance Analysis of Parts and Assemblies

1989 ◽  
Author(s):  
R. T. Scott ◽  
G. A. Gabriele
Keyword(s):  
Real World ◽  
Probability Distributions ◽  
Three Dimensional ◽  
Tolerance Analysis ◽  
The Real ◽  
Assembly Tolerance ◽  
Computer Aided ◽  
Probability Information ◽  
Exact Constraint

Abstract An exact constraint scheme based on the physical contacting constraints of real part mating features is used to represent the process of assembling the parts. To provide useful probability information about how assembly dimensions are distributed when the parts are assembled as intended, the real world constraints that would prevent interference are ignored. This work addresses some limitations in the area of three dimensional assembly tolerance analysis. As a result of this work, the following were demonstrated: 1. Assembly of parts whose assembly mating features are subjected to variation; 2. Assemble parts using a real world set of exact constraints; 3. Provide probability distributions of assembly dimensions.

Fuzzy Tolerance Analysis of 3-D Mechanical Assemblies

1997 ◽  
Author(s):  
K. Srikanth ◽  
F. W. Liou ◽  
S. N. Balakrishnan
Keyword(s):  
Fuzzy Logic ◽  
Manufacturing Process ◽  
Three Dimensional ◽  
Tolerance Analysis ◽  
Tolerance Design ◽  
Cost Information ◽  
Assembly Tolerance ◽  
Mechanical Assemblies ◽  
Representation Scheme ◽  
Tolerance Assignment

Abstract Tolerance design is interdisciplinary in nature and is characterized by a highly uncertain environment. In recent years, fuzzy logic has appeared as a credible alternative for tolerance design. In this paper a fuzzy based tolerance representation scheme is presented to model three dimensional (3-D) tolerances. With this representation, relative assembly tolerance constraints can be expressed. A fuzzy tolerance generation and assignment process for assembly is discussed. Fuzzy tolerance equations are generated for 3-D assembly considerations. Manufacturing process information, along with uncertain cost information modeled in fuzzy terms, is added to the system to arrive at a cost-optimal tolerance assignment.

Three Dimensional Assembly Tolerance Analysis of Gear Drivetrain

2013 ◽  
Vol 655-657 ◽  
pp. 1656-1661
Author(s):  
Xiao Long Li ◽  
Gui Hua Li ◽  
Jun Ying Wang ◽  
Hui Wang
Keyword(s):  
Three Dimensional ◽  
Tolerance Analysis ◽  
Assembly Tolerance ◽  
Analysis Process ◽  
Assembly Accuracy ◽  
3D Assembly ◽  
Prediction And Control ◽  
And Control ◽  
Assembly Error ◽  
Assembly Analysis

Assembly accuracy has a crucial impact on the movement, load and fatigue of gear drivetrain. In this paper, a methodology on the accuracy prediction and control of complex drivetrain is presented. The proposed approach tries to simplify the assembly tolerance computation but grasping main assembly error factors in the assembly process of gear drivetrain. Jacobian -Torsor method is used in the analysis process, and results show a proper performance which indicates a potential opportunity for further deep and wide research on the 3D assembly analysis and simplification method.

Morphometry of the sacrum and its implication on trans-sacral corridors using a computed tomography data-based three-dimensional statistical model

2017 ◽  
Vol 17 (8) ◽  
pp. 1141-1147 ◽  
Author(s):  
Daniel Wagner ◽  
Lukas Kamer ◽  
Takeshi Sawaguchi ◽  
Robert Geoff Richards ◽  
Hansrudi Noser ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Statistical Model ◽  
Three Dimensional ◽  
Tomography Data

A New Tolerance Analysis Method for Designers and Manufacturers

1987 ◽  
Vol 109 (2) ◽  
pp. 112-116 ◽  
Author(s):  
W. H. Greenwood ◽  
K. W. Chase
Keyword(s):  
Tolerance Analysis ◽  
New Method ◽  
Analysis Method ◽  
Worst Case ◽  
Assembly Tolerance ◽  
Naturally Occurring ◽  
Methods Of Analysis

Even when all manufactured parts for an assembly are produced within limits, these parts still may not assemble properly if the assembly tolerance analysis was inadequately performed. Naturally occurring shifts in a process can produce biased distributions which can result in increased assembly problems and a greater number of rejects than anticipated. The most common methods of analysis of assembly tolerance buildup are worst case and root sum squares. The limitations of each of these methods are discussed and a simple new method is proposed which accounts for expected bias. This new method includes both worst case and root sum squares as extreme cases.

Worst Case Tolerance Analysis with Nonlinear Problems

1988 ◽  
Vol 110 (3) ◽  
pp. 232-235 ◽  
Author(s):  
W. H. Greenwood ◽  
K. W. Chase
Keyword(s):  
Iterative Method ◽  
Significant Influence ◽  
Three Dimensional ◽  
Nonlinear Problems ◽  
Tolerance Analysis ◽  
Rational Basis ◽  
Worst Case ◽  
Manufactured Products ◽  
Engineering Drawings ◽  
Tolerance Accumulation

When designers assign tolerances on engineering drawings, they have a significant influence on the resulting cost and producibility of manufactured products. A rational basis for assigning tolerances involves constructing mathematical models of tolerance accumulation in assemblies of parts. However, tolerance stacks in two or three-dimensional problems or other nonlinear assembly functions may distort the resultant assembly tolerances, altering the range and symmetry. An iterative method is described for adjusting the nominal dimensions of the component parts such that the specified assembly limits are not violated.

A New Approach to Assemble Tolerance Analysis Based on CE/TOL

2014 ◽  
Vol 852 ◽  
pp. 634-638
Author(s):  
Xiu Heng Zhang ◽  
Peng Ba
Keyword(s):  
Three Dimensional ◽  
Tolerance Analysis ◽  
Functional Requirement ◽  
Modeling Tools ◽  
Manufacturing Costs ◽  
New Approach ◽  
Percentage Contribution ◽  
Technical Requirements ◽  
Processing Program ◽  
Mechanical Products

Quality indicators (precision, durability, reliability) of the mechanical products are heavily depended on their tolerance to select reasonable. According to the technical requirements and the processing program of the product in whole or in parts, the parts and components can be allocated on a reasonably tolerance, and the balance can be found between the product's features and manufacturing costs. In this paper, Pro / E modeling tools are used to design parts and assembly. In the assembly process, assembly of components designed is analyzed and synthezed by the using of CE/TOL (tolerance analysis) module of Pro/E. we obtained the percentage contribution of each unit feature to the functional requirement. A percentage contribution can help designer to decide which tolerance is tighten or loosen. The application of the tolerance analysis approacch in a simple three-dimensional sample was also discussed in this paper. Results show that this approach makes manufacturing costs and the probability of excessive interference and accuracy reduce. The accuracy of the product is improved.

Computer-Aided Monte Carlo Aircraft Tolerance Design Based on UG

2011 ◽  
Vol 338 ◽  
pp. 300-303
Author(s):  
Chang Hong Guo ◽  
Ping Xi ◽  
Zhen Yu Wang ◽  
Xing Dong Li
Keyword(s):  
Monte Carlo ◽  
Three Dimensional ◽  
Integrated Design ◽  
Tolerance Analysis ◽  
Digital Design ◽  
Tolerance Design ◽  
Computer Aided ◽  
Design And Manufacture

Along with the CAD technology being popularized, three-dimensional design of aircraft is ultimately realized into digital design. However, aircraft tolerances have not been designed by computer. They are mainly based on lots of manual calculations and not coordinated with integrated design and hold back the development of aircraft digital design and manufacture technologies. This paper introduces how to develop computer-aided aircraft tolerance analysis and distribution modules on UG and introduces Monte Carlo tolerance analysis technology. Running instances of aircraft tolerance design are illustrated in the paper.

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