6,177 research outputs found
Meta-heuristic algorithms in car engine design: a literature survey
Meta-heuristic algorithms are often inspired by natural phenomena, including the evolution of species in Darwinian natural selection theory, ant behaviors in biology, flock behaviors of some birds, and annealing in metallurgy. Due to their great potential in solving difficult optimization problems, meta-heuristic algorithms have found their way into automobile engine design. There are different optimization problems arising in different areas of car engine management including calibration, control system, fault diagnosis, and modeling. In this paper we review the state-of-the-art applications of different meta-heuristic algorithms in engine management systems. The review covers a wide range of research, including the application of meta-heuristic algorithms in engine calibration, optimizing engine control systems, engine fault diagnosis, and optimizing different parts of engines and modeling. The meta-heuristic algorithms reviewed in this paper include evolutionary algorithms, evolution strategy, evolutionary programming, genetic programming, differential evolution, estimation of distribution algorithm, ant colony optimization, particle swarm optimization, memetic algorithms, and artificial immune system
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Three decades of the Shuffled Complex Evolution (SCE-UA) optimization algorithm: Review and applications
Thematic issue on evolutionary algorithms in water resources
Special Issue on Evolutionary Algorithms.H.R. Maier, Z. Kapelan, J. Kasprzyk, L.S. Matot
Sensitivity analysis and parameter estimation for distributed hydrological modeling: potential of variational methods
Variational methods are widely used for the analysis and control of computationally intensive spatially distributed systems. In particular, the adjoint state method enables a very efficient calculation of the derivatives of an objective function (response function to be analysed or cost function to be optimised) with respect to model inputs. In this contribution, it is shown that the potential of variational methods for distributed catchment scale hydrology should be considered. A distributed flash flood model, coupling kinematic wave overland flow and Green Ampt infiltration, is applied to a small catchment of the Thoré basin and used as a relatively simple (synthetic observations) but didactic application case. It is shown that forward and adjoint sensitivity analysis provide a local but extensive insight on the relation between the assigned model parameters and the simulated hydrological response. Spatially distributed parameter sensitivities can be obtained for a very modest calculation effort (~6 times the computing time of a single model run) and the singular value decomposition (SVD) of the Jacobian matrix provides an interesting perspective for the analysis of the rainfall-runoff relation. For the estimation of model parameters, adjoint-based derivatives were found exceedingly efficient in driving a bound-constrained quasi-Newton algorithm. The reference parameter set is retrieved independently from the optimization initial condition when the very common dimension reduction strategy (i.e. scalar multipliers) is adopted. Furthermore, the sensitivity analysis results suggest that most of the variability in this high-dimensional parameter space can be captured with a few orthogonal directions. A parametrization based on the SVD leading singular vectors was found very promising but should be combined with another regularization strategy in order to prevent overfitting
A machine learning and chemometrics assisted interpretation of spectroscopic data: a NMR-based metabolomics platform for the assessment of Brazilian propolis
In this work, a metabolomics dataset from 1H nuclear magnetic resonance
spectroscopy of Brazilian propolis was analyzed using machine learning
algorithms, including feature selection and classification methods. Partial
least square-discriminant analysis (PLS-DA), random forest (RF), and wrapper
methods combining decision trees and rules with evolutionary algorithms (EA)
showed to be complementary approaches, allowing to obtain relevant information
as to the importance of a given set of features, mostly related to the
structural fingerprint of aliphatic and aromatic compounds typically found in
propolis, e.g., fatty acids and phenolic compounds. The feature selection and
decision tree-based algorithms used appear to be suitable tools for building
classification models for the Brazilian propolis metabolomics regarding its geographic
origin, with consistency, high accuracy, and avoiding redundant information
as to the metabolic signature of relevant compounds.The work is partially funded by ERDF -European Regional Development Fund through the COMPETE Programme (operational programme for competitiveness) and by National Funds through the FCT (Portuguese Foundation for Science and Technology) within projects ref. COMPETE FCOMP-01-0124-FEDER-015079 and PEstOE/ EEI/UI0752/2011. RC's work is funded by a PhD grant from the Portuguese FCT ( ref. SFRH/BD/66201/2009)
Optimization and analysis by CFD of mixing-controlled combustion concepts in compression ignition engines
El trabajo presentado en esta Tesis está motivado por la necesidad de
los motores de combustión interna alternativos de reducir el consumo de combustible y
las emisiones de CO2 mientras se satisfacen las cada vez más restrictivas regulaciones
de emisiones contaminantes. Por lo tanto, el objetivo principal de este estudio es
optimizar un sistema de combustión de encendido por compresión controlado por
mezcla para probar su potencial como motores de futura generación. Con esta
meta se ha desarrollado un sistema automático que combina CFD con métodos de
optimización avanzados para analizar y entender las configuraciones óptimas.
Los resultados presentados en este trabajo se dividen en dos bloques principales.
El primero corresponde a la optimización de un sistema de encendido por compresión
convencional alimentado con diésel. El segundo se centra en un concepto de
combustión avanzado donde se ha sustituido el fuel por Dimetil-eter. En ambos casos,
el estudio no sólo halla una configuración óptima sino que también se describen las
relaciones causa/efecto entre los parámetros más relevantes del sistema de combustión.
El primer bloque aplica métodos de optimización no-evolutivos a un motor
medium-duty alimentado por diésel tratando de minimizar consumo a la vez que se
mantienen las emisiones contaminantes por debajo de los estándares de emisiones
contaminantes impuestos. Una primera parte se centra en la optimización de la
geometría de la cámara de combustión y el inyector. Seguidamente se extiende el
estudio añadiendo los settings de renovación de la carga de y de inyección al estudio,
ampliando el potencial de la optimización. El estudio demuestra el limitado potencial
de mejora de consumo que tiene el motor de referencia al mantener los niveles de
emisiones contaminantes. Esto demuestra la importancia de incluir parámetros de
renovación de la carga e inyección al proceso de optimización.
El segundo bloque aplica una metodología basada en algoritmos genéticos al
diseño del sistema de combustión de un motor heavy-duty alimentado con Dimetileter.
El estudio tiene dos objetivos, primero la optimización de un sistema de
combustión convencional controlado por mezcla con el objetivo de lograr mejorar
el consumo y reducir las emisiones contaminantes hasta niveles inferiores a los
estándares US2010. Segundo la optimización de un sistema de combustión trabajando
en condiciones estequiométricas acoplado con un catalizador de tres vías buscando
reducir consumo y controlar las emisiones contaminantes por debajo de los estándares
2030. Ambas optimizaciones incluyen tanto la geometría como los parámetros más
relevantes de renovación de la carga y de inyección. Los resultados presentan un
sistema de combustión convencional óptimo con una notable mejora en rendimiento y
un sistema de combustión estequiométrica que es capaz de ofrecer niveles de NOx
menores al 1% de los niveles de referencia manteniendo niveles competitivos de
rendimiento.
Los resultados presentados en esta Tesis ofrecen una visión extendida de las
ventajas y limitaciones de los motores MCCI y el camino a seguir para reducir las
emisiones de futuros sistemas de combustión por debajo de los estándares establecidos.
A su vez, este trabajo también demuestra el gran potencial que tiene el Dimetil-eter
como combustible para futuras generaciones de motores.The work presented in this Thesis was motivated by the needs of
internal combustion engines (ICE) to decrease fuel consumption and CO2 emissions,
while fulfilling the increasingly stringent pollutant emission regulations. Then, the
main objective of this study is to optimize a mixing-controlled compression ignition
(MCCI) combustion system to show its potential for future generation engines. For
this purpose an automatic system based on CFD coupled with different optimization
methods capable of optimizing a complete combustion system with a reasonable time
cost was designed together with the methodology to analyze and understand the new
optimum systems.
The results presented in this work can be divided in two main blocks, firstly an
optimization of a conventional diesel combustion system and then an optimization of
a MCCI system using an alternative fuel with improved characteristics compared
to diesel. Due to the methodologies used in this Thesis, not only the optimum
combustion system configurations are described, but also the cause/effect relations
between the most relevant inputs and outputs are identified and analyzed.
The first optimization block applies non-evolutionary optimization methods in two
sequential studies to optimize a medium-duty engine, minimizing the fuel consumption
while fulfilling the emission limits in terms of NOx and soot. The first study targeted
four optimization parameters related to the engine hardware including piston bowl
geometry, injector nozzle configuration and mean swirl number. After the analysis of
the results, the second study extended to six parameters, limiting the optimization
of the engine hardware to the bowl geometry, but including the key air management
and injection settings. The results confirmed the limited benefits, in terms of fuel
consumption, with constant NOx emission achieved when optimizing the engine
hardware, while keeping air management and injection settings. Thus, including air
management and injection settings in the optimization is mandatory to significantly
decrease the fuel consumption while keeping the emission limits.
The second optimization block applies a genetic algorithm optimization
methodology to the design of the combustion system of a heavy-duty Diesel engine
fueled with dimethyl ether (DME). The study has two objectives, the optimization
of a conventional mixing-controlled combustion system aiming to achieve US2010
targets and the optimization of a stoichiometric mixing-controlled combustion system
coupled with a three way catalyst to further control NOx emissions and achieve
US2030 emission standards. These optimizations include the key combustion system
related hardware, bowl geometry and injection nozzle design as input factors, together
with the most relevant air management and injection settings. The target of the
optimizations is to improve net indicated efficiency while keeping NOx emissions, peak
pressure and pressure rise rate under their corresponding target levels. Compared to
the baseline engine fueled with DME, the results of the study provide an optimum
conventional combustion system with a noticeable NIE improvement and an optimum
stoichiometric combustion system that offers a limited NIE improvement keeping
tailpipe NOx values below 1% of the original levels.
The results presented in this Thesis provide an extended view of the advantages
and limitations of MCCI engines and the optimization path required to achieve future
emission standards with these engines. Additionally, this work showed how DME is a
promising fuel for future generation engines since it is able to achieve future emission
standards while maintaining diesel-like efficiencyEl treball presentat en esta Tesi està motivat per la necessitat dels
motors de combustió interna alternatius de reduir el consum de combustible i les
emissions de CO2 mentres se satisfan les cada vegada mes restrictives regulacions
d'emissions contaminants. Per tant, l'objectiu principal d'este estudi es optimitzar
un sistema de combustió d'encesa per compressió controlat per mescla per a provar
el seu potencial com a motors de futura generació. Amb esta meta s'ha desenrotllat
un sistema automàtic que combina CFD amb mètodes d'optimització avançats per a
analitzar i entendre les configuracions òptimes. Els resultats presentats en este treball
es dividixen en dos blocs principals. El primer correspon a l'optimització d'un sistema
d'encesa per compressió convencional alimentat amb dièsel. El segon se centra en un
concepte de combustió avançat on s'ha substituït el fuel per Dimetil-eter. En ambdós
casos, l'estudi no sols troba una configuració òptima sinó que també es descriuen les
relacions causa/efecte entre els paràmetres més rellevants del sistema de combustió.
El primer bloc aplica mètodes d'optimització no-evolutius a un motor mediumduty
alimentat per dièsel tractant de minimitzar consum al mateix temps que
es mantenen les emissions contaminants per davall dels estàndards d'emissions
contaminants impostos. Una primera part se centra en l'optimització de la geometria
de la cambra de combustió i l'injector. A continuació s'estén l'estudi afegint els
settings de renovació de la càrrega de i d'injecció a l'estudi, ampliant el potencial de
l'optimització. L'estudi demostra el limitat potencial de millora de consum que té el
motor de referència al mantindre els nivells d'emissions contaminants. Açò demostra
la importància d'incloure paràmetres de renovació de la càrrega i injecció al procés
d'optimització.
El segon bloc aplica una metodologia basada en algoritmes genètics al disseny del
sistema de combustió d'un motor heavy-duty alimentat amb Dimetil-eter. L'estudi té
dos objectius, primer l'optimització d'un sistema de combustió convencional controlat
per mescla amb l'objectiu d'aconseguir millorar el consum i reduir les emissions
contaminants fins nivells inferiors als estàndards US2010. Segon l'optimització d'un
sistema de combustió treballant en condicions estequiomètriques acoblat amb un
catalitzador de tres vies buscant reduir consum i controlar les emissions contaminants
per davall dels estàndards 2030. Ambdós optimitzacions inclouen tant la geometria
com els paràmetres més rellevants de renovació de la càrrega i d'injecció. Els resultats
presenten un sistema de combustió convencional òptim amb una notable millora en
rendiment i un sistema de combustió estequiomètrica que és capaç d'oferir nivells
de NOx menors al 1% dels nivells de referència mantenint nivells competitius de
rendiment.
Els resultats presentats en esta Tesi oferixen una visió estesa dels avantatges i
limitacions dels motors MCCI i el camï que s'ha de seguir per a reduir les emissions
de futurs sistemes de combustió per davall dels estàndards establits. Al seu torn, este
treball també demostra el gran potencial que té el Dimetil-eter com a combustible
per a futures generacions de motors.Hernández López, A. (2018). Optimization and analysis by CFD of mixing-controlled combustion concepts in compression ignition engines [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/103826TESI
AI Solutions for MDS: Artificial Intelligence Techniques for Misuse Detection and Localisation in Telecommunication Environments
This report considers the application of Articial Intelligence (AI) techniques to
the problem of misuse detection and misuse localisation within telecommunications
environments. A broad survey of techniques is provided, that covers inter alia
rule based systems, model-based systems, case based reasoning, pattern matching,
clustering and feature extraction, articial neural networks, genetic algorithms, arti
cial immune systems, agent based systems, data mining and a variety of hybrid
approaches. The report then considers the central issue of event correlation, that
is at the heart of many misuse detection and localisation systems. The notion of
being able to infer misuse by the correlation of individual temporally distributed
events within a multiple data stream environment is explored, and a range of techniques,
covering model based approaches, `programmed' AI and machine learning
paradigms. It is found that, in general, correlation is best achieved via rule based approaches,
but that these suffer from a number of drawbacks, such as the difculty of
developing and maintaining an appropriate knowledge base, and the lack of ability
to generalise from known misuses to new unseen misuses. Two distinct approaches
are evident. One attempts to encode knowledge of known misuses, typically within
rules, and use this to screen events. This approach cannot generally detect misuses
for which it has not been programmed, i.e. it is prone to issuing false negatives.
The other attempts to `learn' the features of event patterns that constitute normal
behaviour, and, by observing patterns that do not match expected behaviour, detect
when a misuse has occurred. This approach is prone to issuing false positives,
i.e. inferring misuse from innocent patterns of behaviour that the system was not
trained to recognise. Contemporary approaches are seen to favour hybridisation,
often combining detection or localisation mechanisms for both abnormal and normal
behaviour, the former to capture known cases of misuse, the latter to capture
unknown cases. In some systems, these mechanisms even work together to update
each other to increase detection rates and lower false positive rates. It is concluded
that hybridisation offers the most promising future direction, but that a rule or state
based component is likely to remain, being the most natural approach to the correlation
of complex events. The challenge, then, is to mitigate the weaknesses of
canonical programmed systems such that learning, generalisation and adaptation
are more readily facilitated
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