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.

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.

A new approach of surfaces registration considering form errors for precise assembly

2020 ◽  
Vol 40 (6) ◽  
pp. 789-800
Author(s):  
Qiushuang Zhang ◽  
Xin Jin ◽  
Zhihua Liu ◽  
Zhijing Zhang ◽  
Yan Fang ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Optimal Solution ◽  
Registration Method ◽  
Content Type ◽  
Form Errors ◽  
Contact Points ◽  
Assembly Accuracy ◽  
Prediction And Control ◽  
Experimental Values ◽  
And Control

Purpose The modern manufacturing industry has put forward higher requirements for the assembly accuracy of components with the development of the industrial technology. For precision assembly, the traditional assembly process study based on tolerance has had difficulty in meeting these requirements. Hence, the distribution of the form errors must be considered. The registration between the two mating surfaces with form errors determines the parts’ assembly position, and is the basis for the prediction and control of the assembly accuracy. This study aims to provide a new surfaces registration method which takes form errors into consideration. Design/methodology/approach This study presents a new registration approach based on the minimum potential energy. A unique set of contact points on mating surfaces that meet the actual conditions can be obtained and the spatial position of the assembled part is calculated. Findings The experimental results show that the calculated values are in good agreement with the experimental values. Furthermore, the root mean square error is within 2%, which proves the validity and accuracy of the approach. Originality/value This paper provides an effective and new method for precision assembly which takes form errors into consideration. The method can give the optimal solution of the contact points, which is more consistent with the actual assembly situation and provides a basis for predicting assembly accuracy.

scholarly journals Tolerance analysis and optimization based on 3DCS

2021 ◽  
Vol 2137 (1) ◽  
pp. 012070
Author(s):  
Yuan Gao
Keyword(s):  
Three Dimensional ◽  
Tolerance Analysis ◽  
Tolerance Allocation ◽  
Engineering Practice ◽  
Chain Model ◽  
Ring Model ◽  
Assembly Accuracy ◽  
Simulation Results ◽  
Automobile Headlight ◽  
Tolerance Distribution

Abstract At present, with the increasing requirements of major enterprises on assembly accuracy, the problem of interference and excessive clearance between parts needs to be solved. In order to analyze and optimize the tolerances in the actual assembly of the parts, a three-dimensional vector ring model is proposed on the basis of the dimensional chain model, and the tolerance distribution is optimized by the “dichotomy method”. With the help of 3DCS, the virtual assembly of the automobile headlight is carried out, and the sensitivity analysis is carried out by establishing the measurement of the gap between the turn signal and headlight in the automobile headlight, and the simulation results are used to obtain a reasonable improvement in tolerance allocation that meets the design criteria and saves costs. The results are compared with the traditional method of optimizing the allocation of equal tolerances and are clearly superior, providing a method for optimizing the allocation of tolerances to parts in engineering practice.

scholarly journals Analysis of Assembly Tolerance Based on Assembly Constraint Information Model

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Chunxi Li ◽  
Wenjun Hou
Keyword(s):  
Search Algorithm ◽  
Three Dimensional ◽  
Transmission Model ◽  
Secondary Development ◽  
Assembly Tolerance ◽  
The Monte Carlo Method ◽  
Mechanical Products ◽  
Calculation Results ◽  
Assembly Performance ◽  
Assembly Error

Mechanical products are composed of two or more parts. The geometric tolerance and dimensional tolerance of each feature in part will affect the assembly performance of the product, which are accumulated and propagated between assembly fit and parts. In this paper, through the secondary development of CAD software, the B-rep model of parts is obtained. The model information is decomposed and simplified based on geometric features to obtain the key information of parts in the assembly process, simplify the operation, and improve the accuracy. Through a directed graph network, the transmission model of assembly error information based on geometrical and dimensional tolerances (GD&T) on the surface of parts is established. Combined with the error transfer characteristics of different geometric surfaces and different error sources, guided by the breadth-first search algorithm and the shortest path theory, the search and establishment of a three-dimensional assembly chain are realized. Finally, the three-dimensional chain is simulated by the Monte Carlo method. The calculation results are compared with the error range obtained by the traditional method to prove the effectiveness of the method.

Neural network prediction and control of three-dimensional unsteady separated flowfields

1995 ◽  
Vol 32 (6) ◽  
pp. 1213-1220 ◽  
Author(s):  
William E. Faller ◽  
Scott J. Schreck ◽  
Marvin W. Luttges
Keyword(s):  
Neural Network ◽  
Three Dimensional ◽  
Neural Network Prediction ◽  
Prediction And Control ◽  
Network Prediction ◽  
And Control

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.

A novel tolerance analysis method for three-dimensional assembly

2018 ◽  
Vol 233 (7) ◽  
pp. 1818-1827 ◽  
Author(s):  
Yanlong Cao ◽  
Ting Liu ◽  
Jiangxin Yang ◽  
Huiwen Yan
Keyword(s):  
Monte Carlo ◽  
Three Dimensional ◽  
Tolerance Analysis ◽  
Quality Level ◽  
Mechanical Assembly ◽  
Quasi Monte Carlo ◽  
Novel Approach ◽  
Key Characteristics ◽  
Classical Vector ◽  
Assembly Analysis

Three-dimensional tolerance analysis is increasingly becoming an innovative method for computer-aided tolerancing. Its aim is to support the design, manufacturing, and inspection by providing a quantitative analysis of the effects of multi-tolerances on final functional key characteristics and predict the quality level. This article proposes a novel approach for three-dimensional assembly analysis—a hybridization of vector loop and quasi-Monte Carlo method. The former is used to establish the three-dimensional assembly chain and obtain the assembly function. The latter is adopted to generate n sets of dimensional values according to the distribution of each dimension in chain. The new method is shown to inherit many of the best features of classical vector loop and quasi-Monte Carlo, combining easy-to-obtain assembly function with accurate statistical analysis. For every set of dimensional values, one sample value of a functional requirement can be computed with the Newton–Raphson iterative procedure. A crank slider mechanical assembly is shown as an example to illustrate the proposed method.

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