T-Maps based Tolerance Analysis of Composites Assembly Involving Compensation Strategies

2021 ◽  
pp. 1-9
Author(s):  
Hua Wang ◽  
Yujin Lin ◽  
Chen Yan
Keyword(s):  
Tolerance Analysis ◽  
Clamping Force ◽  
Analysis Method ◽  
Tolerance Synthesis ◽  
Assembly Tolerance ◽  
Point Space ◽  
Variation Propagation

Abstract Clamping force and shimming are two important compensation processes in the composites assembly. Their effects on variation propagation should be investigated in tolerance analysis. The paper presents a tolerance analysis method for composites assembly based on the T-Maps method, mainly concerning the anisotropic variations accumulation and propagation where there is the clamping force modification and the shimming. Variations of the composite parts in different directions are represented by the T-Maps. Since the different axial deviations are represented in the same Euclidean point-space, the T-Maps based tolerance analysis of the composite parts assembly provides more accurate and reliable results. Compensation processes, the clamping force, and the shimming, on assembly tolerance synthesis of the composite parts, are analyzed clearly in the T-Map. This procedure is found to be effective for the anisotropy oriented assembly tolerance analysis, especially concerning about effect of the clamping force and the shimming on variations accumulation and propagation. The assembly of an aircraft composite elevator is considered to demonstrate the effectiveness of the T-Maps based method. The procedures outlined in the paper are quite general and can be used for assembly tolerance analysis of anisotropic parts.

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.

A Parameterized Method for Assembly Tolerance Analysis Based on Deviation Propagation Theory

2013 ◽  
Vol 475-476 ◽  
pp. 1449-1453
Author(s):  
Hai Li ◽  
Yun Feng Leng ◽  
Hai Ping Zhu ◽  
Pei Gen Li
Keyword(s):  
Functional Relationship ◽  
Tolerance Analysis ◽  
Propagation Model ◽  
Analysis Method ◽  
Propagation Theory ◽  
Quality Requirements ◽  
Assembly Tolerance ◽  
Deviation Propagation

The paper proposed a new tolerance analysis method: a unified tolerance and deviation model is adopted to synthesize different kinds of tolerances; an integrated tolerance propagation model is designed to construct the functional relationship between the tolerances and quality requirements. The method is simpler and more widely applicable than the traditional linearization analysis method. A case study is provided to illustrate the proposed method.

Anisotropy Oriented Tolerance Analysis of Composite Assembly With T-Maps Method

2019 ◽  
Author(s):  
Hua Wang ◽  
Chen Yan ◽  
Junyang Yu
Keyword(s):  
Composite Materials ◽  
Euclidean Space ◽  
Tolerance Analysis ◽  
Composite Panels ◽  
Assembly Process ◽  
Analysis Method ◽  
Point Space ◽  
Skin Panels

Abstract Anisotropy is an outstanding characteristic of the composite parts, and should be considered during the course of the tolerance analysis. The paper presents a tolerance analysis method for composite elevator assembly using T-Maps method, mainly concerning the variations originated from the anisotropy of the composite materials. The composite elevator is composed of the forward spar, the skin panels, and the ribs. Variations of the composite forward spar and the composite panels in different directions are represented by the T-Maps. Mating clearances of the composite spar and the metallic joints are mapped to the hypothetical Euclidean space. Since the different axial deviations are represented in the same Euclidean point-space, anisotropy oriented tolerance analysis of the composite parts assembly could be conducted with more accurate results. This procedure is found to be effective for anisotropy oriented tolerance analysis. The assembly of the composite elevator is investigated intensively by the proposed method. The procedures outlined in the paper are quite general and can be used for tolerance analysis of any anisotropic parts assembly process.

Tolerance Analysis Method for Passive Alignment of Photonic Chips

2014 ◽  
Vol 4 (4) ◽  
pp. 718-726
Author(s):  
Johan Frederik Cornelis van Gurp ◽  
Marcel Tichem ◽  
Urs Staufer
Keyword(s):  
Tolerance Analysis ◽  
Analysis Method ◽  
Passive Alignment

A novel tolerance analysis method based on the "reverse model" considering robustness

2022 ◽  
Author(s):  
Linjun Zhong ◽  
Yang Yang ◽  
Leshi Shu ◽  
Ping Jiang ◽  
Hua Wei
Keyword(s):  
Tolerance Analysis ◽  
Analysis Method

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.

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