123,194 Hits in 4.9 sec

Error analysis and tolerance allocation for confocal scanning microscopy using the Monte Carlo method

Hongki Yoo, Dong-Kyun Kang, SeungWoo Lee, Junhee Lee, Dae-Gab Gweon, Jose-Angel Conchello, Carol J. Cogswell, Tony Wilson
2004 Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XI  
The purpose of allocating the optimal tolerances is minimizing the cost while keeping the performance of the system.  ...  In the optimal problem, we set the performance requirements as constraints and maximized the tolerances. The Monte Carlo Method, a statistical simulation method, is used in tolerance analysis.  ...  SIMULATION RESULTS FOR CONFOCAL SCANNING MICROSCOPY Performance Index Selection for CSM With the proposed method, the optimal tolerances are allocated for the CSM(confocal scanning microscopy).  ... 
doi:10.1117/12.529942 fatcat:vwv3rt4dpzcwhltlmnwtqc4lyi

From tolerance allocation to tolerance-cost optimization: a comprehensive literature review

Martin Hallmann, Benjamin Schleich, Sandro Wartzack
2020 The International Journal of Advanced Manufacturing Technology  
As a consequence, since its beginnings in the 1960s, least-cost tolerance allocation using optimization techniques, i.e. tolerance-cost optimization, was continuously in focus of numerous research activities  ...  However, inconsistent terminology and the lack of a classification of the various relevant aspects is an obstacle for the application of tolerance-cost optimization approaches.  ...  Cheng Optimal statistical toler- ance allocation for recip- rocal exponential cost- tolerance function Lagrange multiplier method; Statistical toler- ance evaluation; 10.1177/0954405412473720 2013  ... 
doi:10.1007/s00170-020-05254-5 fatcat:q7dubbqonrebngwc4vloxgibce

Least Cost Tolerance Allocation for Systems with Time-variant Deviations

M.S.J. Walter, T.C. Spruegel, S. Wartzack
2015 Procedia CIRP  
Therefore, Particle Swarm Optimization -a global statistical optimization technique -is applied to the time-variant tolerance-optimization problem to determine the tolerance range as well as a certain  ...  This paper presents a methodology for the least cost tolerance allocation of systems with time-variant deviations, such as deformation, thermal expansion, mobility of parts and wear.  ...  Acknowledgements The authors thank the German Research Foundation (DFG) for supporting the research project WA2913/8-3.  ... 
doi:10.1016/j.procir.2015.04.035 fatcat:zkkmzeu7zvdgzi5pvhpgqx65tq

Tolerance synthesis using second-order fuzzy comprehensive evaluation and genetic algorithm

Shuping Ji, Xiaoli Li
2000 International Journal of Production Research  
Then, a mathematical model for tolerance allocation is formed based on the machinability of the parts. Finally, the model is solved using the genetic algorithm (GA).  ...  This paper introduces a new method for tolerance synthesis of machining parts. The new method consists of three steps.  ...  Currently, for mass production, the tolerance synthesis is mainly based on statistical techniques, in which the tolerance allocation is based on the statistical signi® cance.  ... 
doi:10.1080/002075400422752 fatcat:anq3h7rpqfbfvaqiw5o74bqjvi

Concurrent tolerance allocation and scheduling for complex assemblies

K. Geetha, D. Ravindran, M. Siva Kumar, M.N. Islam
2015 Robotics and Computer-Integrated Manufacturing  
A genetic algorithm (GA) was developed for allocating the tolerance of the components and determining the best product sequence of the scheduling.  ...  Traditionally, tolerance allocation and scheduling have been dealt with separately in the literature. The aim of tolerance allocation is to minimize the tolerance cost.  ...  Cheng KM, Tsai JC (2011), Optimal statistical tolerance allocation of assemblies for minimum manufacturing cost. Applied Mechanics and Materials 52-54:1818-1823. 6.  ... 
doi:10.1016/j.rcim.2015.03.001 fatcat:ju43ybwvtfb7zaypdz24dhgwli

Multi-objective optimization for optimum tolerance synthesis with process and machine selection using a genetic algorithm

K. Geetha, D. Ravindran, M. Siva Kumar, M. N. Islam
2012 The International Journal of Advanced Manufacturing Technology  
This paper presents a new approach to the tolerance synthesis of the component parts of assemblies by simultaneously optimizing three manufacturing parameters: manufacturing cost, including tolerance cost  ...  A methodology has been developed using the Genetic Algorithm (GA) technique to solve this multiobjective optimization problem.  ...  Cherng and Tsai [34] presented a systematic method for optimal statistical tolerance allocation using the Lagrange multiplier method for minimizing manufacturing costs subject to constraints on dimensional  ... 
doi:10.1007/s00170-012-4662-6 fatcat:iiflnjs5xnay3hdxfkaebelhvu


Constanţa RĂDULESCU, Liviu Marius CÎRŢÎNĂ, Constantin MILITARU
2010 Fiabilitate şi Durabilitate  
The optimization criterion for determining the assembly tolerances is the minimization of the product achievement cost. The relation between tolerances and cost will be revealed in a graphic component  ...  Determining the adequate tolerances of the sizes chains is based on Lagrange's multipliers use.  ...  The allocated tolerance resulted by calculation with the help of the statistic method was similarly achieved, using equation (1) .  ... 
doaj:56427df427d040999d4aea0a9227a41f fatcat:a57kj2qitfee7ha2axaaosvm7y

Activity-Based Tolerance Allocation (ABTA) – driving tolerance synthesis by evaluating its global cost

Alain Etienne, Jean-Yves Dantan, Ali Siadat, Patrick Martin
2009 International Journal of Production Research  
This is an author-deposited version published in: Handle ID Abstract: This paper deals with tolerance allocation driven by an activity based approach.  ...  Taking into consideration the impacts of tolerance allocation on the manufacturing process and so the production cost, several examples are given to illustrate this concept.  ...  In addition, this concept can be automated: it can become a solution for the optimization of tolerance allocation… Our framework of tolerance allocation The aim of this framework is to determine the  ... 
doi:10.1080/00207540701819225 fatcat:ka3tfzwh5re7xhkmpl7kcz2sye

Analysis of Approaches of Tolerance Allocation regarding to Economic Efficiency

Peter Gust, Alina Sersch, Tobias Steger, Christoph Schluer
2019 Proceedings of the International Conference on Engineering Design  
Through a literature research already existing approaches for the determination of costs related to tolerances during the specification of technical components are pointed out and possible approaches for  ...  AbstractThe aim of this paper is to examine the current state of research on tolerance-induced costs in Germany.  ...  A cost-optimized tolerance allocation can be realized if the necessary dimensional accuracies are allocated while taking into account the expected manufacturing costs (Jourdan, 2001 ).  ... 
doi:10.1017/dsi.2019.355 fatcat:fjsvndkfczcrjeadnrnikaej2e

Tolerance synthesis by neural learning and nonlinear programming

Mu-Chen Chen
2001 International Journal of Production Economics  
By solving the formulated mathematical models, the optimal tolerance allocation can be generated.  ...  ective statistical tool for determining the relationships between input factors and output responses.  ...  An SA-based optimization algorithm is utilized to resolve the formulated complex mathematical models for tolerance synthesis problems. The SA-based algorithm can obtain optimal tolerance allocation e!  ... 
doi:10.1016/s0925-5273(00)00044-x fatcat:vndai55crbdgdjbrtabjwbsqri

Concurrent optimization of dimensions and tolerances on structures and mechanisms

Antonio Armillotta
2020 The International Journal of Advanced Manufacturing Technology  
The paper deals with a problem of robust optimization of mechanical assemblies, which combines the allocation of tolerances with the selection of dimensional parameters.  ...  The proposed solution is based on an optimality condition involving both tolerances and dimensions, which allows to define a joint optimization problem avoiding the need of two sequential optimization  ...  Optimal allocation For any choice of dimensions, the optimal tolerances are the solution of the allocation problem (1).  ... 
doi:10.1007/s00170-020-06322-6 fatcat:mlevqm7yivhbdfigejyinkzz3a

Discrete tolerance allocation for product families

Johan Lööf, Rikard Söderberg
2012 Engineering optimization (Print)  
This article extends earlier research on the discrete tolerance allocation problem in order to optimize an entire product family simultaneously.  ...  The article also consists of an extensive review on the discrete tolerance allocation problem which motivates the extension of the discrete tolerance allocation problem.  ...  In this phase, the concept is optimized with respect to robustness and verified against assumed production systems by statistical tolerance analysis.  ... 
doi:10.1080/0305215x.2011.569545 fatcat:l7kyazfxqbhunlph435rzf2t6e

Tolerance allocation: A reliability based optimisation approach

Konstatinos Bacharoudis, Atanas Popov, Svetan Ratchev
2020 Procedia Manufacturing  
Tolerance analysis and allocation are two activities of great importance in product development.  ...  Abstract Tolerance analysis and allocation are two activities of great importance in product development.  ...  were used for all the tolerance allocation approaches.  ... 
doi:10.1016/j.promfg.2020.10.146 fatcat:rvweglbyxveh5nr4ww3ebnj3me

Dynamic OFDMA Resource Allocation for QoS Guarantee and System Optimization of Best Effort and Non Real-time Traffic [article]

Arijit Ukil, Jaydip Sen, Debasish Bera
2011 arXiv   pre-print
To achieve the requirement of high data rate, low latency, user fairness for next generation wireless networks, proper designing of cross-layer optimized dynamic resource allocation algorithm is prerequisite  ...  system performance, by exploiting the inherent time-diversity gain in mobile wireless environment for delay-tolerant applications.  ...  PFI at t th allocation instant for k th user is expressed as [5] : The objective of PF optimization is to allocate subcarrier n to k* user when [9] : ato ∆ = Min ( ) k k ∀ ∆ , , k* = kt kt k ω ω max  ... 
arXiv:1107.1038v1 fatcat:me3b5x32ojhixfsifuafqtorae

Geometrical and dimensional tolerance analysis for the radial flux type of permanent magnet generator design

Muhammad Fathul Hikmawan, Agung Wibowo, Muhammad Kasim
2021 Journal of Mechatronics, Electrical Power, and Vehicular Technology  
Mechanical tolerance is something that should be carefully taken into consideration and cannot be avoided in a product for manufacturing and assembly needs, especially in the design stage, to avoid excessive  ...  The values of tolerance allocation and re-allocation process are carried out by considering the capability of the production machine and the ease level of the manufacturing process.  ...  Pudji Irasari, M.Sc.rer.nat for the permission given to use the electrical design of the generator as the material for this research and to publish this paper.  ... 
doi:10.14203/j.mev.2021.v12.68-80 fatcat:fdv2ldj245fzlhfcjtlfmf45si
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