This paper presents an automated tool for estimating assembly times of products based on a three step process: connectivity graph generation from assembly mate information, structural complexity metric analysis of the graph, and application of the complexity metric vector to predictive artificial neural network models. The tool has been evaluated against different training set cases, suggesting that partially defined assembly models and training product variety are critical characteristics. Moreover, the tool is shown to be robust and insensitive to different modeling engineers. The tool has been implemented in a commercial CAD system and shown to yield results of within ±25% of predicted values. Additional extensions and experiments are recommended to improve the tool.

References

References
1.
O'Grady
,
P.
,
1991
, “
A Review of Approaches to Design for Assembly
,”
Concurr. Eng. Res. Appl.
,
1
(
3
), pp.
5
11
.
2.
Boothroyd
,
G.
, and
Alting
,
L.
,
1992
, “
Design for Assembly and Disassembly
,”
CIRP Ann.
,
41
, pp.
625
636
.10.1016/S0007-8506(07)63249-1
3.
Wang
,
L.
,
Keshavarzmanesh
,
S.
,
Feng
,
H.-Y.
, and
Buchal
,
R. O.
,
2008
, “
Assembly Process Planning and Its Future in Collaborative Manufacturing: A Review
,”
Int. J. Adv. Manuf. Technol.
,
41
(
1–2
), pp.
132
144
.10.1007/s00170-008-1458-9
4.
Chiu
,
M.-C.
, and
Kremer
,
G. E. O.
,
2011
, “
Investigation of the Applicability of Design for X Tools During Design Concept Evolution: A Literature Review
,”
Int. J. Prod. Dev.
,
13
(
2
), pp.
132
167
.10.1504/IJPD.2011.038869
5.
Maynard
,
H.
,
Stegemerten
,
G. J.
, and
Schwab
,
J.
,
1948
,
Methods-Time Measurement
,
McGraw-Hill
,
New York
.
6.
Laring
,
J.
,
2002
, “
MTM-Based Ergonomic Workload Analysis
,”
Int. J. Indus. Ergon.
,
30
(
3
), pp.
135
148
.10.1016/S0169-8141(02)00091-4
7.
Boothroyd
,
G.
, and
Walker
,
J.
,
1996
, “
Design for Assembly
,”
Handbook of Manufacturing Engineering
,
J.
Walker
, ed.,
Marcel Dekker
,
New York
, pp.
1
50
.
8.
Ohashi
,
T.
,
2002
, “
Extended Assemblability Evaluation Method (AEM)
,”
JSME Int. J., Ser. C
,
45
(
2
), p.
567
574
.10.1299/jsmec.45.567
9.
Mohd Naim
,
Z.
, 2009, “Design for Assembly and Application Using Hitachi Assemblability Evaluation Method”, Thesis, Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Kuantan, Pahang Darul Makmur.
10.
Miyakawa
,
S.
, and
Ohashi
,
T.
,
1986
, “
The Hitachi Assemblability Evaluation Method (AEM)
,”
Conference on Product Design for Assembly
, New Port, RI, pp.
15
17
.
11.
Kroll
,
E.
,
Lenz
,
E.
, and
Wolberg
,
J. R.
,
1988
, “
A Knowledge-Based Solution to the Design for Assembly Problem
,”
Manuf. Rev.
,
1
(
2
), pp.
104
108
.
12.
Swift
,
K. G.
,
1989
, “
Expert System Aids Design for Assembly
,”
Assem. Autom.
,
9
(
3
), pp.
132
136
.10.1108/eb004272
13.
Tate
,
S.
,
Jared
,
G.
,
Brown
,
N.
, and
Swift
,
K. G.
,
2000
, “
An Introduction to the Designers' Sandpit
,”
International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, ASME, Baltimore, MD, pp.
84
87
.
14.
Dalgleish
,
G. F.
,
Jared
,
G. E.
, and
Swift
,
K. G.
,
2000
, “
Design for Assembly Influencing the Design Process
,”
J. Eng. Design
,
11
, pp.
17
29
.10.1080/095448200261162
15.
Boothroyd
,
G.
,
1994
, “
Product Design for Manufacture and Assembly
,”
Comput.-Aided Des.
,
26
(
7
), pp.
505
520
.10.1016/0010-4485(94)90082-5
16.
Esterman
,
M.
, and
Kamath
,
K.
,
2010
, “
Design for Assembly Line Performance: The Link Between DFA Metrics and Assembly Line Performance Metrics
,”
Volume 6: 15th Design for Manufacturing and the Lifecycle Conference; 7th Symposium on International Design and Design Education
, ASME, pp.
73
84
.
17.
Namouz
,
E.
,
Summers
,
J. D.
, and
Mocko
,
G. M.
,
2012
, “
Reasoning: Source of Variability in the Boothroyd and Dewhurst Assembly Time Estimation Method
,”
International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, Chicago, IL, pp. DETC2012–71075.
18.
Owensby
,
J. E.
,
Shanthakumar
,
A.
,
Namouz
,
E.
,
Rayate
,
V.
, and
Summers
,
J. D.
,
2011
, “
Evaluation and Comparison of Two Design for Assembly Methods: Subjectivity of Information
,”
ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, pp.
DETC2011
47530
.
19.
Barnes
,
C. J.
,
Dalgleish
,
G. F.
,
Jared
,
G. E. M.
,
Mei
,
H.
, and
Swift
,
K. G.
, 1999, “
Assembly Oriented Design
,”
Proceedings of the 1999 IEEE International Symposium on Assembly and Task Planning (ISATP’99) (Cat. No. 99TH8470)
, IEEE, pp.
45
50
.
20.
Kim
,
G. J.
,
Bekey
,
G. A.
, and
Goldberg
,
K. Y.
, 1992, “
A Shape Metric for Design-for-Assembly,” Proceedings 1992 IEEE International Conference on Robotics and Automation
,
IEEE Comput. Soc. Press
, pp.
968
973
.
21.
Mathieson
,
J. L.
,
Wallace
,
B. A.
, and
Summers
,
J. D.
, “Assembly time modeling through connective complexity metrics.” International Journal of Computer Integrated Manufacturing, ahead-of-print (2012) pp.
1
13
.
22.
Miller
,
M.
,
Mathieson
,
J.
,
Summers
,
J. D.
, and
Mocko
,
G. M.
,
2012
, “
Representation: Structural Complexity of Assemblies to Create Neural Network Based Assembly Time Estimation Models
,”
International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, Chicago, IL, pp.
DETC2012
71337
.
23.
Ault, H. K., 1999, “3-D Geometric Modeling for the 21st Century.”
Engineering Design Graphics Journal
,
63
(2), pp.
33
42
.
24.
Veisz
,
D.
,
Joshi
,
S.
, and
Summers
,
J. D.
,
2012
, “Computer-aided Design versus Sketching: An Exploratory Case Study,” Artificial Intelligence for Engineering Design, Analysis and Manufacturing,
26
(3), pp.
317
335
.
25.
Shanthakumar
,
A.
, and
Summers
,
J. D.
, 2013, “Design Enabler to Recognize Duplicate Geometries in CAD Assemblies.”
Computer-Aided Design and Applications Journal
10
(6), pp.
889
904
.10.3722/cadaps.2013.889-904
26.
Namouz
,
E. Z.
,
Mears
,
L.
, and
Summers
,
J.
,
2011
, “
Lazy Parts Indication Method: Application to Automotive Components
,”
SAE 2011 World Congress & Exhibition
, pp.
2001
2011
.
27.
Griese
,
D.
,
Namouz
,
E.
,
Shankar
,
P.
,
Summers
,
J. D.
, and
Mocko
,
G. M.
,
2011
, “
Application of a Lightweight Engineering Tool: Lazy Parts Analysis and Redesign of a Remote Controlled Car
,”
ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, pp.
DETC2011
47544
.
28.
Owensby
,
J. E.
, 2012, “Automated Assembly Time Prediction Tool Using Pre-Defined Mates from CAD Assemblies”, Master's thesis, Department of Mechanical Engineering, Clemson University, Clemson, SC.
29.
Mathieson
,
J. L.
, 2011, “Connective Complexity Methods for Analysis and Prediction in Engineering Design”, Master's thesis, Department of Mechanical Engineering, Clemson University, Clemson, SC.
30.
Bashir
,
H. A.
, and
Thomson
,
V.
,
2001
, “
An Analogy-Based Model for Estimating Design Effort
,”
Des. Stud.
,
22
, pp.
157
167
.10.1016/S0142-694X(00)00015-6
31.
Shah
,
J. J.
, and
Runger
,
G.
,
2011
, “
Misuse of Information-Theoretic Dispersion Measures as Design Complexity Metrics
,”
ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, ASME, Washington, DC, p.
DETC2011/DTM–48295
.
32.
Singh
,
G.
,
Balaji
,
S.
,
Shah
,
J. J.
,
Corman
,
D.
,
Howard
,
R.
,
Mattikalli
,
R.
, and
Stuart
,
D.
,
2012
, “
Evaluation of Network Measures as Complexity Metrics
,”
ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
, ASME, Chicago, IL, pp.
DETC2012–70483
.
33.
Mathieson
,
J. L.
, and
Summers
,
J. D.
,
2010
, “
Complexity Metrics for Directional Node-Link System Representations: Theory and Applications
,” Proceedings of the ASME IDETC/CIE 2010.
34.
Barclay
,
I.
, and
Dann
,
Z.
,
2000
, “
New-Product-Development Performance Evaluation: A Product-Complexity-Based Methodology
,”
IEE Proc.: Sci., Meas. Technol.
,
147
(
3
), pp.
41
55
.10.1049/ip-smt:20000077
35.
Mathieson
,
J.
, and
Summers
,
J.
,
2009
, “
Relational DSMs in Connectivity Complexity Measurement
,”
Proceedings of 11th International DSM Conference
, pp.
15
26
.
36.
Pramanick
,
I.
, and
Ali
,
H.
,
1994
, “
Analysis and Experiments for a Parallel Solution to the All Pairs Shortest Path Problem
,”
IEEE International Symposium on Circuits and Systems
, IEEE, New York.
37.
Goldberg
,
A. V.
, and
Tarjan
,
R. E.
,
1986
, “
A New Approach to the Maximum Flow Problem
,”
Annual ACM Symposium on Theory of Computing
, ACM, New York, NY, pp.
136
146
.
38.
Freeman
,
L.
,
1977
, “
A Set of Measures of Centrality Based on Betweenness
,”
Soc. Networks
,
40
, pp.
35
41
.
39.
Freeman
,
L.
,
1979
, “
Centrality in Social Networks: Conectual Clarification
,”
Soc. Networks
,
1
, pp.
215
239
.10.1016/0378-8733(78)90021-7
40.
Koschutzki
,
D.
,
Lehmann
,
K. A.
,
Peeters
,
L.
,
Richer
,
S.
,
Tenfelde-Podehl
,
D.
, and
Zlotowski
,
O.
,
2005
, “
Centrality Indices
,”
Network Analysis: Methodological Foundations
,
U.
Brandes
, and
T.
Erlebach
, eds.,
Springer Verlag
,
New York, NY
.
41.
Sabidussi
,
G.
,
1966
, “
The Centrality Index of a Graph
,”
Psychometrika
,
31
, pp.
581
603
.10.1007/BF02289527
42.
Watts
,
D. J.
, and
Strogatz
,
S.
,
1998
, “
Collective Dynamics of ‘Small-World’ Networks
,”
Nature
,
393
(
6
), pp.
440
442
.10.1038/30918
43.
Summers
,
J. D.
, and
Ameri
,
F.
,
2008
, “
An Algorithm for Assessing Design Complexity Through a Connectivity View
,”
Proceedings of the TMCE 2008
.
44.
Bader
,
G. D.
, and
Hogue
,
C. W. V.
,
2003
, “
An Automated Method for Finding Molecular Complexes in Large Interaction Network
,”
BMC Bioinf.
,
4
, pp.
1
27
.10.1186/1471-2105-4-2
45.
Boothroyd
,
G.
,
Dewhurst
,
P.
, and
Knight
,
W.
,
2002
,
Product Design for Manufacture and Assembly
,
M. Dekker
,
New York
.
46.
Chavali
,
S. R. K.
,
Sen
,
C.
,
Mocko
,
G. M.
, and
Summers
,
J. D.
,
2008
, “
Using Rule-Based Design in Engineer-to-Order Industry: An SME Case Study
,”
Comput.-Aided Des. Appl.
,
5
, pp.
178
193
.
47.
Tu
,
J. V.
,
1996
, “
Advantages and Disadvantages of Using Artificial Neural Networks versus Logistic Regression for Predicting Medical Outcomes
,”
J. Clin. Epidemiol.
,
49
(
11
), pp.
1225
1231
.10.1016/S0895-4356(96)00002-9
48.
Boothroyd
,
G.
,
Dewhurst
,
P.
, and
Knight
,
W. A.
,
2011
,
Product Design for Manufacture and Assembly
,
CRC Press
,
Boca Raton
, FL.
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