Filters








98,577 Hits in 12.0 sec

k-out-of-nsystems: An exact formula for the stationary availability and multi-objective configuration design based on mathematical programming and TOPSIS

Silvia Carpitella, Antonella Certa, Joaquín Izquierdo, Concetta Manuela La Fata
2018 Journal of Computational and Applied Mathematics  
.; La Fata, CM. (2018) . k-out-of-n systems: an exact formula for the stationary availability and multi-objective configuration design based on mathematical programming and TOPSIS.  ...  In this regard, the present paper proposes an exact formula for computing the system stationary availability of a k-out-of-n system.  ...  In the present work, the choice to be made concerns the optimal number of redundant components n in the design of a k-out-of-n system.  ... 
doi:10.1016/j.cam.2017.01.006 fatcat:ow7kuxy72fdfvoavyfneagrdkm

Developing a bi-objective optimization model for solving the availability allocation problem in repairable series–parallel systems by NSGA II

Maghsoud Amiri, Mostafa Khajeh
2015 Journal of Industrial Engineering International  
The two objectives of the problem are the availability of the system and the total cost of the system.  ...  Bi-objective optimization of the availability allocation problem in a series-parallel system with repairable components is aimed in this paper.  ...  Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://crea tivecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution  ... 
doi:10.1007/s40092-015-0128-4 fatcat:stmmaqbdb5bvvo5cmih7o2gz4i

Multi-State System Reliability: A New and Systematic Review

Gu Yingkui, Li Jing
2012 Procedia Engineering  
Multi-state system reliability models allow both the system and its components to assume more than two levels of performance.  ...  The review about the latest studies and advances about multi-state system reliability evaluation, multi-state systems optimization and multi-state systems maintenance is summarized in this paper.  ...  Acknowledgment This research was partially supported by the National Natural Science Foundation of China under the contract number 61164009, the Science and Technology Support Project Plan of Jiangxi Province  ... 
doi:10.1016/j.proeng.2011.12.756 fatcat:ognoyogn75fabj3dtyc3gw2ziq

Novel Aero-Engine Multi-Disciplinary Preliminary Design Optimization Framework Accounting for Dynamic System Operation and Aircraft Mission Performance

Alexios Alexiou, Nikolaos Aretakis, Ioannis Kolias, Konstantinos Mathioudakis
2021 Aerospace (Basel)  
In its current status, the framework includes modules for multi-point steady-state engine design, aerodynamic design, engine geometry and weight, aircraft mission analysis, Nitrogen Oxide (NOx) emissions  ...  Different types of analysis can be specified such as sensitivity, design of experiment and optimization.  ...  The help of Fernando Puech Helguero from EAI with FMI in PROOSIS is greatly appreciated. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/aerospace8020049 fatcat:jpgmfcqi4rd3dcod3yfoveiq3y

Availability Analysis Of Milling System In A Rice Milling Plant

P. C. Tewari, Parveen Kumar
2016 Zenodo  
The availability analysis of the system is carried out to determine the effect of failure and repair rates of each subsystem on overall performance (i.e. steady state availability) of system concerned.  ...  These equations are solved using normalizing conditions and recursive method to drive out the steady state availability expression of the system.  ...  System optimization considering component reliability estimation uncertainty: A multi- criteria approach Reliability, MTTF and steady-state availability analysis of systems with exponential lifetimes  ... 
doi:10.5281/zenodo.1127165 fatcat:6gkxlu5vsjdbrd6drmofgvntui

Multi-Objective Optimal Longitudinal Flight Control System Design for Large Flexible Transport Aircraft

Sipeng Song, James F. Whidborne, Mudassir Lone, Arturo Molina-Cristobal
2018 2018 UKACC 12th International Conference on Control (CONTROL)  
The algorithm uses a mixed optimization approach based on a combination of Linear Quadratic Regulator (LQR) control and a Multi-Objective Genetic Algorithm (MOGA) to search over a set of possible weighting  ...  This paper presents a multi-objective evolutionary algorithm design of a longitudinal optimal controller for a large flexible transport aircraft.  ...  Furthermore, for an -input, n-state system model with the Q and R weighting matrices set to be diagonal, the number of tuning parameters is + n − 1.  ... 
doi:10.1109/control.2018.8516783 fatcat:ikexhshps5cn5ihxq4p573ghjm

Efficient optimization of multi-objective redundancy allocation problems in series-parallel systems

Mina Ebrahimi Arjestan
2017 Decision Science Letters  
with n and R parameters in k out of n sub system with independent and the same parts.  ...  The following systems are under k-out -of -n.  ... 
doi:10.5267/j.dsl.2016.11.004 fatcat:bzghbzhi4rcrzcwt3rq4i4otq4

Simultaneous Optimization of Design and Maintenance through a Hybrid Process Using Genetic Algorithms

O. Adjoul, A. Feugier, K. Benfriha, A. Aoussat
2019 Zenodo  
This paper presents an approach for simultaneous optimization of the design and maintenance of multi-component systems.  ...  This article proposes a method of DFM that assists designers to propose dynamic maintenance for multi-component industrial systems.  ...  The initial costs of a design solution are: =∑ C C , (2) where n is the number of components in the system, C the cost of component i and C , ) is the cost of the information available on component i (  ... 
doi:10.5281/zenodo.3455594 fatcat:of4ir7zlszeepfnlc5tzjg2vou

A service reliability model predictive control with dynamic safety stocks and actuators health monitoring for drinking water networks

J.M. Grosso, C. Ocampo-Martinez, V. Puig
2012 2012 IEEE 51st IEEE Conference on Decision and Control (CDC)  
Simulation results in the Barcelona drinking water network have shown the effectiveness of the dynamic safety stocks allocation and the actuators health monitoring to assure service reliability and optimizing  ...  The upper layer performs a local steady-state optimization to set up an inventory replenishment policy based on dynamic safety stocks for each tank in the network.  ...  Therefore, system safety can be enhanced by taking into account the health of the components in the controller design.  ... 
doi:10.1109/cdc.2012.6426036 dblp:conf/cdc/GrossoOP12 fatcat:qaur5yobmfhhnigxh4rles6awm

Integrated excitation and turbine control in a multimachine power system

P.A.W. Walker, A.M. Serag, O.H. Abdalla
1989 IEE Proceedings C Generation Transmission and Distribution  
A multi-input/multi-output linear model of the system, as seen from this unit, is obtained by least-squares identification.  ...  System behaviour is assessed in relation to smalland large-disturbance studies. Simulation results include responses to three-phase short circuits, and dynamic and transient stability boundaries.  ...  Acknowledgments The work described in this paper is part of a joint research programme between the University of Helwan and the University of Liverpool. The authors are grateful to Professor J.D.  ... 
doi:10.1049/ip-c.1989.0046 fatcat:xr5jeh2y6ffxniyiecffeciewe

Multi-Objective Optimization of a Complex System using GPSIA+DS

Okafor Ekene Gabriel, Sun Youchao, Uhuegho Osaretin Kole
2013 Research Journal of Applied Sciences Engineering and Technology  
A complex system comprising of mixed configuration, k-out-of-n and redundant subsystem was used to validate GPSIA+DS in comparison with Genetic Pareto Set Identification Algorithm (GPSIA) and Fast Non-Dominated  ...  In this study, an efficient biologically inspired constrained multi-objective optimization algorithm called Genetic Pareto Set Identification Algorithm plus Different Sex (GPSIA+DS) was developed.  ...  is a k-out-of-n system. k can take values 2, 3 or 4, while n is set to 4.  ... 
doi:10.19026/rjaset.6.3477 fatcat:6gd6da3cubhjnofuak4f2w53ra

Optimal Output Vector Feedback Control Strategy for Wind Power Systems

Shahida Khatoon, Ibraheem Nasiruddin, Reshma Ehtesham, Ramesh C. Bansal
2015 Electric power components and systems  
The system dynamic responses and pattern of closed loop system eigenvalues for various system states are obtained with the designed optimal regulators to investigate the system dynamic performance.  ...  Efforts have been made to propose optimal regulators based on feedback of output state variables, which are easily accessible and available for the measurement.  ...  Design Matrices State cost weighting matrix Q and control cost weighting matrix R are selected as identity matrices of appropriate dimension.  ... 
doi:10.1080/15325008.2015.1022910 fatcat:ngtb2cxjjnbjdej4pplahpzn3q

Risk-based optimization of pipe inspections in large underground networks with imprecise information

A. Mancuso, M. Compare, A. Salo, E. Zio, T. Laakso
2016 Reliability Engineering & System Safety  
Specifically, Bayesian models represent the consequences of the component failures, whereas risk assessment is based on Multi-Attribute Value Theory and Multi-Attribute Utility Theory.  ...  Dynamic Bayesian Net- works, Portfolio Decision Analysis, Multi-objective optimization.  ... 
doi:10.1016/j.ress.2016.03.011 fatcat:2wp3re3iw5a2djjwwoc7uyfore

Multi-layer health-aware economic predictive control of a pasteurization pilot plant

Fatemeh Karimi Pour, Vicenç Puig, Carlos Ocampo-Martinez
2018 International Journal of Applied Mathematics and Computer Science  
In order to achieve the best minimal accumulated damage and operational costs, the single-layer approach is improved with a multi-layer control scheme, where the solution of the dynamic optimization problem  ...  By using the results obtained from this algorithm, a simplified model that characterizes the health of the system is developed and integrated into the predictive controller.  ...  ., 2016; Lobos and Momot, 2002) but without considering safety issues of the system components.  ... 
doi:10.2478/amcs-2018-0007 fatcat:tnrhkf3sunffpl3gkgttsld2u4

On Initial Design and Modelling of a 10 MW Medium Speed Drivetrain for Offshore Wind Turbines

Shuaishuai Wang, Amir R. Nejad, Torgeir Moan
2019 Journal of Physics, Conference Series  
Four gearbox layout options are provided and compared, and one optimal option is finally selected with holistic considerations of volume and weight as well as load sharing performance principles.  ...  This paper presents the initial design and modelling of a medium speed drivetrain for the DTU 10 MW offshore wind turbine. Design basis and criteria of the drivetrain are described.  ...  When all components are approved to satisfy the design requirements, the potential of the gearbox weight and volume optimization is checked by assessing the safety margin in each stage.  ... 
doi:10.1088/1742-6596/1356/1/012024 fatcat:nzuwywehqffvtb3psxhxxrf4ki
« Previous Showing results 1 — 15 out of 98,577 results