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.

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.

scholarly journals Pengaruh Biaya Produksi Terhadap Harga Jual Ikan Nila Pada Balai Benih Ikan Lokal (BBIL) Di Desa Cukan Lipai Kecamatan Batang Alai Selatan Kabupaten Hulu Sungai Tengah

2016 ◽  
Vol 6 (1) ◽  
pp. 406-413
Author(s):  
Azwar Saihani ◽  
Yulia Yulia
Keyword(s):  
Functional Relationship ◽  
Equation Model ◽  
Production Costs ◽  
Selling Price ◽  
Fish Production ◽  
Analysis Method ◽  
Independent Variables ◽  
A Value ◽  
Independent Variable

       This study aims (i) to know the effect of production costs on the selling price of tilapia, (ii) how the costs are spent on fish production in fish hatchery activities at the Local Fish Seed Center (LFSC) in Cukan Lipai Village, Batang Alai Selatan District, Hulu Sungai Tengah Regency. The method used is a case study, respondents in this study conducted interviews with employees of the Local Fish Seed Center (BBIL). The data analysis method used is multiple regression analysis, linear relationship equation between two or more independent variables so that the functional relationship between the dependent variable (Y) and the independent variable (XI, X2, Xn), X variable as the independent variable and Y variable as the dependent variable The results obtained a value (r²) of 0.374 which means that production costs have an influence on the selling price of 37.4%, in tilapia hatchery business in Cukan Lipai Village, Batang Alai Selatan District, Hulu Sungai Tengah Regency. The influence of variable (X) is the production cost of variable (Y) selling price is 37.4%, while the remaining 62.6% can be influenced by other variables not included in the equation model

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.

scholarly journals Tolerance Analysis of Over-Constrained Assembly Considering Gravity Influence: Constraints of Multiple Planar Hole-Pin-Hole Pairs

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Xia Liu ◽  
Luling An ◽  
Zhiguo Wang ◽  
Changbai Tan ◽  
Xiaoping Wang
Keyword(s):  
Coupling Effect ◽  
Tolerance Analysis ◽  
Physical Factors ◽  
Analysis Method ◽  
Mechanical Joints ◽  
Propagation Analysis ◽  
Deviation Propagation ◽  
Minimum Potential ◽  
Statistical Tolerance ◽  
Statistical Tolerance Analysis

Over-constrained assembly of rigid parts is widely adopted in aircraft assembly to yield higher stiffness and accuracy of assembly. Unfortunately, the quantitative tolerance analysis of over-constrained assembly is challenging, subject to the coupling effect of geometrical and physical factors. Especially, gravity will affect the geometrical gaps in mechanical joints between different parts, and thus influence the deviations of assembled product. In the existing studies, the influence of gravity is not considered in the tolerance analysis of over-constrained assembly. This paper proposes a novel tolerance analysis method for over-constrained assembly of rigid parts, considering the gravity influence. This method is applied to a typical over-constrained assembly with constraints of multiple planar hole-pin-hole pairs. This type of constraints is non-linear, which makes the tolerance analysis more challenging. Firstly, the deviation propagation analysis of an over-constrained assembly is conducted. The feasibility of assembly is predicted, and for a feasible assembly, the assembly deviations are determined with the principle of minimum potential energy. Then, the statistical tolerance analysis is performed. The probabilities of assembly feasibility and quality feasibility are computed, and the distribution of assembly deviations is estimated. Two case studies are presented to show the applicability of the proposed method.

Modeling of rotation accuracy of multi-support rotating machinery considering geometric errors and part deformation

2020 ◽  
Vol 40 (5) ◽  
pp. 665-673
Author(s):  
Yanhui Sun ◽  
Junkang Guo ◽  
Jun Hong ◽  
Guanghui Liu
Keyword(s):  
Tolerance Analysis ◽  
Theoretical Method ◽  
Rotating Machinery ◽  
Geometric Errors ◽  
Support Structures ◽  
Content Type ◽  
Beam Elements ◽  
Propagation Analysis ◽  
Deviation Propagation

Purpose This paper aims to develop a theoretical method to analyze the rotation accuracy of rotating machinery with multi-support structures. The method effectively considers the geometric errors and assembly deformation of parts. Design/methodology/approach A method composed of matrix and FEA methods is proposed to do the analysis. The deviation propagation analysis results and external loads are set as boundary conditions of the model which is built with Timoshenko beam elements to calculate the spatial pose of the rotor. The calculation is performed repeatedly as the rotation angle increased to get the rotation trajectories of concerned nodes, and further evaluation is done to get the rotation accuracy. Additionally, to get more reliable results, the bearing motion errors and stiffness are analyzed by a static model considering manufacturing errors of parts. Findings The feasibility of the proposed method is verified through a case study of a high-precision spindle. The method reasonably predicts the rotation accuracy of the spindle. Originality/value For rotating machinery with multi-support structures, the paper proposes a modeling method to predict the rotation accuracy, simultaneously considering geometric errors and assembly deformation of parts. This would improve the accuracy of tolerance analysis.

Variation Analysis of Compliant Parts in Composite Material Joined by Adhesive: A Numerical Tool

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Andrea Corrado ◽  
Wilma Polini
Keyword(s):  
Composite Material ◽  
Functional Relationship ◽  
Tolerance Analysis ◽  
Variation Analysis ◽  
Geometric Deviations ◽  
Numerical Tool ◽  
Compliant Parts ◽  
The Individual ◽  
Good Agreement

Tolerance analysis defines a procedure to estimate the resultant variation of the assembly geometry, given the tolerances associated with individual components and the functional relationship between the individual components and the assembly requirements. This aspect is particularly relevant when parts made of composite material are considered, since the research emphasis to date was on the design and fabrication of composite parts, with considerably less attention to quality issues in their subsequent assembly. This work presents a numerical tool to solve the tolerance analysis of assemblies made of compliant parts in composite material; it estimates the geometric deviations of an assembly due to the compliance of the material, the geometrical deviations of the components and the fastening of the parts by adhesive. The comparison between numerical and experimental results obtained for a case study shows a good agreement.

Tolerance Optimization for Assembly Systems Based on Quality Requirements Using State Space Model

2014 ◽  
Vol 472 ◽  
pp. 985-989
Author(s):  
Hai Li ◽  
Hai Ping Zhu ◽  
Bo Xing Liu ◽  
Pei Gen Li
Keyword(s):  
State Space ◽  
State Space Model ◽  
Propagation Model ◽  
Stator Core ◽  
Quality Performance ◽  
Quality Requirements ◽  
Space Model ◽  
Turbo Generator ◽  
Deviation Propagation ◽  
Tolerance Model

The paper proposed a new systematic method to construct the functional relationship between product quality and tolerances. In the method, a unified user-defined tolerance model is designed to synthesize different kinds of tolerances using 3-D state space model; a deviation propagation model is proposed to analyze the quality-tolerance function. Particularly, the method is suitable for any kinds of tolerances and quality requirements. The method is successfully applied to the turbo-generator stator-core lamination auto-assembly project, and Monte Carlo method is used to simulate the quality performance and optimize the target tolerances.

Blockchain in Supply Chain: Case Study of Lottemart Ciputat

2019 ◽  
Vol 5 (1) ◽  
pp. 38-49 ◽  
Author(s):  
B. K. Handoyo ◽  
M. R. Mashudi ◽  
H. P. Ipung
Keyword(s):  
Decision Making ◽  
Supply Chain ◽  
Supply Chain Management ◽  
Information Asymmetry ◽  
New Technology ◽  
Business Case ◽  
Analysis Method ◽  
Chain Management ◽  
Production Processes

Current supply chain methods are having difficulties in resolving problems arising from the lack of trust in supply chains. The root reason lies in two challenges brought to the traditional mechanism: self-interests of supply chain members and information asymmetry in production processes. Blockchain is a promising technology to address these problems. The key objective of this paper is to present qualitative analysis for blockchain in supply chain as the decision-making framework to implement this new technology. The analysis method used Val IT business case framework, validated by the expert judgements. The further study needs to be elaborated by either the existing organization that use blockchain or assessment by the organization that will use blockchain to improve their supply chain management.

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