scholarly journals Optimal Allocation of Reliability in Series Parallel Production System

10.5772/55725 ◽  
2013 ◽  
Author(s):  
Rami Abdelkader ◽  
Zeblah Abdelkader ◽  
Rahli Mustapha ◽  
Massim Yamani
Keyword(s):  
Production System ◽  
Optimal Allocation ◽  
In Series

scholarly journals Risk-Optimized Design of Production Systems by Use of GRAMOSA

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Michael Lütjen ◽  
Abderrahim Ait Alla
Keyword(s):  
Production System ◽  
Production Systems ◽  
System Development ◽  
Discrete Event ◽  
Mathematical Optimization ◽  
Optimized Design ◽  
Domain Specific Modeling ◽  
In Series ◽  
Production Technologies ◽  
Optimized Allocation

Today production and logistic systems are getting more complex. This is a problem which the planning and design of such systems have to deal with. One main issue of production system development in series production is the planning of production processes and systems under uncertainty. New and existing production technologies are often not fully adoptable to new products. This is why some of the main characteristics, like, for example, cost, time, or quality, are not definable at the beginning. Only value ranges and probabilities can be estimated. However, the adaptation process is controllable, which means that the adaptation results are depending on the existing development budget and its resources. This paper presents an approach for the optimized allocation of development resources regarding the adaptation risks of production technologies and processes. The modeling concept GRAMOSA is used for integrated modeling and discrete event-based simulation of the aspired production system. To this end a domain-specific modeling language (DSML) is applied. The further risk-based analysis of the simulation results and the optimized allocation of the development budget are done by use of mathematical optimization.

Machine Tool Service for Mass-Production Machining Systems

2018 ◽  
Vol 12 (4) ◽  
pp. 507-513
Author(s):  
Makoto Fujishima ◽  
◽  
Takashi Hoshi ◽  
Hiroki Nakahira ◽  
Masafumi Takahashi ◽  
...  
Keyword(s):  
Machine Tool ◽  
Production System ◽  
Mass Production ◽  
Machine Tools ◽  
Production Systems ◽  
Production Volume ◽  
Machining Processes ◽  
In Series ◽  
Tool Service ◽  
Large Production

Mass-production machining systems that are comprised of machine tools are often configured in series by dividing the machining processes in order to manage the large production volume. This indicates that if one of the machines stops owing to a mechanical malfunction, the entire production line needs to be stopped. Thus, machine tools in mass-production systems are required to be highly reliable and easy to maintain. Predictive maintenance, which enables operators to detect any signs of failure in the machine tool components, needs to be performed for the machines as well. In this work, various approaches for the improvement of the maintainability of machine tools used in a mass-production system are reported.

scholarly journals A Note on the Electromechanical Design of a Robotic Hummingbird

Actuators ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 52
Author(s):  
André Preumont ◽  
Han Wang ◽  
Shengzheng Kang ◽  
Kainan Wang ◽  
Ali Roshanbin
Keyword(s):  
Sensitivity Analysis ◽  
Heat Generation ◽  
Production System ◽  
Lift Force ◽  
Flight Time ◽  
Flapping Wing ◽  
Wing Size ◽  
Dc Motors ◽  
In Series ◽  
Discharge Model

This paper analyzes the lift-production system in hovering of the flapping wing robot COLIBRI of the size of a hummingbird. The paper first examines the flapping wing mechanism for which a new gear transmission is proposed to reduce the friction and facilitate the assembly. Next, a sensitivity analysis is performed on the wing size. Then, the paper discusses several options for the gearbox, various DC motors and two battery configurations (a single battery or two batteries in series) to minimize the heat generation and increase the flight time. The configuration involving two batteries has been found more effective. The flight time is predicted using Shepherd’s discharge model and it is confirmed by an experiment. The robot sustains an endurance of nearly 5 min to produce a lift force equal to the weight of the robot.

Interim Products—An Essential Innovation in Shipyards

1985 ◽  
Vol 1 (03) ◽  
pp. 170-173
Author(s):  
Louis D. Chirillo
Keyword(s):  
Los Angeles ◽  
Research Program ◽  
Production System ◽  
Standard Series ◽  
In Series ◽  
Marine Engineers ◽  
Interim Products

Ships of the same kind built in series are not a panacea for lagging productivity. The solution is more fundamental and imaginative. The solution involves a rethinking of an entire shipbuilding system. The world's most productive shipbuilders employ "standard" series interim products made possible by a production system that classifies parts, subassemblies, and assemblies by the problems inherent in their manufacture. The result is highly rationalized design modules and highly organized work. Such interim products are flexible enough to be parts of many sizes and types of ships. Runs of such interim products, not ships, is the key! Research managed and cost-shared by the Los Angeles Division of Todd Pacific Shipyards Corp. for the Maritime Administration created National Shipbuilding Research Program (NSRP) has motivated the current revolution in U.S. shipbuilding methods even for building warships. Guidance was provided by Panel SP-2 of the Ship Production Committee of The Society of Naval Architects and Marine Engineers.

scholarly journals Defining Optimal Maintenance Scope for Multiple k-out-of-n Load-Sharing Production Systems Connected in Series Based on RUL Predictions

2020 ◽  
Vol 7 (3) ◽  
Author(s):  
Leonardo R. Rodrigues
Keyword(s):  
Production System ◽  
Production Cost ◽  
Health Management ◽  
Load Sharing ◽  
Remaining Useful Life ◽  
Production Unit ◽  
Maintenance Cost ◽  
Total Cost ◽  
In Series ◽  
Optimal Maintenance

This paper presents a method to define the optimal maintenance scope of a production system consisting of multiple k-out-of-n systems connected in series. Maintenance recommendations are based on Remaining Useful Life (RUL) predictions obtained from a Prognostics and Health Management (PHM) system for each production unit within the production system. Defining the techniques applied in order to estimate the degradation level of production units is out of the scope of this paper. It is assumed here that a PHM system is available and provides the degradation level and RUL estimates for each production unit. The goal is to find the maintenance scope that minimizes the expected total cost per cycle until the next maintenance activity. A k-out-of-n load-sharing system is assumed, which means that the failure of a production unit results in a higher load (and consequently a higher degradation rate) on the surviving production units. The total cost comprises the production cost and the maintenance cost. Production cost of each k-out-of-n system is also affected by the number of surviving production units. A preventive maintenance cost is incurred to maintain a degraded but still functional production unit. A corrective maintenance cost is incurredto maintain a failed production unit. An Ant Colony Optimization (ACO) approach is adopted, which allows the proposed method to deal with large instances of the problem. A numerical example is presented to illustrate the application of the proposed method.

scholarly journals Can Producers’ Price War End Up in an Optimal Allocation?

Mathematics ◽  
2022 ◽  
Vol 10 (2) ◽  
pp. 265
Author(s):  
Marta Kornafel
Keyword(s):  
Production System ◽  
Nash Equilibria ◽  
Optimal Allocation ◽  
Positive Answer ◽  
Production Plan ◽  
Optimal Production ◽  
Multicriteria Game ◽  
Price War ◽  
Production Plans ◽  
Stated Problem

The paper presents a theoretical framework for the phenomenon of the price war in the context of general equilibrium, with special attention to the production system. The natural question that arises is whether Nash-optimal production plans being the reactions to the changing prices can finally approximate a Nash-optimal production plan at the end of this war. To provide an answer, the production system is described as a parametric-multicriteria game. Referring to some results on the lower semicontinuty of the parametric weak-multicriteria Nash equilibria, we provide a positive answer for the stated problem.

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