scholarly journals Analyzing the enhancement of production efficiency using FMEA through simulation-based optimization technique: A case study in apparel manufacturing

2017 ◽  
Vol 4 (1) ◽  
pp. 1284373 ◽  
Author(s):  
E. Pazireh ◽  
A.H. Sadeghi ◽  
S. Shokohyar ◽  
Yibing Li
Keyword(s):  
Production Efficiency ◽  
Optimization Technique ◽  
Apparel Manufacturing ◽  
Simulation Based ◽  
Simulation Based Optimization

scholarly journals Efficient Simulation-Based Toll Optimization for Large-Scale Networks

2021 ◽  
Author(s):  
Carolina Osorio ◽  
Bilge Atasoy
Keyword(s):  
Analytical Model ◽  
Nonlinear Equations ◽  
Network Model ◽  
Large Scale ◽  
Structural Information ◽  
Optimization Technique ◽  
Simulation Based ◽  
Simulation Based Optimization ◽  
Large Scale Networks

This paper proposes a simulation-based optimization technique for high-dimensional toll optimization problems of large-scale road networks. We formulate a novel analytical network model. The latter is embedded within a metamodel simulation-based optimization (SO) algorithm. It provides analytical and differentiable structural information of the underlying problem to the SO algorithm. Hence, the algorithm no longer treats the simulator as a black box. The analytical model is formulated as a system of nonlinear equations that can be efficiently evaluated with standard solvers. The dimension of the system of equations scales linearly with network size. It scales independently of the dimension of the route choice set and of link attributes such as link length. Hence, it is a scalable formulation suitable for the optimization of large-scale networks. For instance, the model is used in the case study of the paper for toll optimization of a Singapore network with more than 4,050 OD (origin-destination) pairs and 18,200 feasible routes. The corresponding analytical model is implemented as a system of 860 nonlinear equations. The analytical network model is validated based on one-dimensional toy network problems. It captures the main trends of the simulation-based objective function and, more importantly, accurately locates the global optimum for all experiments. The proposed SO approach is then used to optimize a set of 16 tolls for the network of expressways and major arterials of Singapore. The proposed method is compared with a general-purpose algorithm. The proposed method identifies good quality solutions at the very first iteration. The benchmark method identifies solutions with similar performance after 2 days of computation or similarly after more than 30 points have been simulated. The case study indicates that the analytical structural information provided to the algorithm by the analytical network model enables it to (i) identify good quality solutions fast and (ii) become robust to both the quality of the initial points and to the stochasticity of the simulator. The final solutions identified by the proposed algorithm outperform those of the benchmark method by an average of 18%.

scholarly journals Optimization of a saturated gas plant: Meticulous simulation-based optimization – A case study

2020 ◽  
Vol 22 ◽  
pp. 21-33 ◽  
Author(s):  
Salah H. Bayoumy ◽  
Sahar M. El-Marsafy ◽  
Tamer S. Ahmed
Keyword(s):  
Simulation Based ◽  
Simulation Based Optimization

Numerical Optimization of Bearing Length in Composite Extrusion Processes

2008 ◽  
Vol 367 ◽  
pp. 47-54 ◽  
Author(s):  
Thomas Kloppenborg ◽  
Marco Schikorra ◽  
Michael Schomäcker ◽  
A. Erman Tekkaya
Keyword(s):  
Material Flow ◽  
Numerical Optimization ◽  
Optimization Technique ◽  
Base Material ◽  
High Strength ◽  
Optimization Method ◽  
Extrusion Process ◽  
Simulation Based ◽  
Small Ratio ◽  
Simulation Based Optimization

The decrease of the bearing length in extrusion processes results in increasing of the material flow and offers, through this, the possibility for manipulation and optimization. This paper presents a simulation based optimization technique which uses this effect for optimizing the material flow in direct extrusion processes. Firstly, the method is used in a multi-extrusion process with equal pitch circle profiles, then in an extrusion process of an asymmetric profile. Furthermore, a composite extrusion process is analyzed where endless wires of high strength steel are embedded in a base material of aluminum. The insertion of reinforcement elements into the base material flow, especially within the small ratio between profile thickness and the reinforcement diameter, can lead to significant local disturbances inside the die, which result in undesirable profile defects. Hence, the simulation-based optimization method is especially used to optimize inhomogeneous wall thicknesses in composite profiles.

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