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genetic algorithm optimisation of vehicle-mounted loop antenna for NVIS applications (vol 35, pg 252, 1999)

ELECTRONICS LETTERS 1999年第7期35卷 607-607页

作者： Austin, BA Liu, WC Department of Electrical Engineering and Electronics The University of Liverpool Liverpool United Kingdom

The performance of a vehicle-mounted loop antenna for near-vertical incidence skywave applications is optimised by using a genetic algorithm in conjunction with the method of moments. Optimum loop current distribution... 详细信息

关键词： reactive loading NVIS applications vehicle-mounted loop antenna Antenna theory method of moments optimisation techniques mobile antennas genetic algorithms optimum loop current distribution current distribution Single antennas loop antennas near-vertical incidence skywave genetic algorithm optimisation antenna theory

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genetic algorithm optimisation of Oil Tanker Control Systems

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IFAC Proceedings Volumes 2001年第7期34卷 227-232页

作者： Eva Alfaro-Cid Euan W. McGookin Centre of Systems and Control & Department of Electronics and Electrical Engineering University of Glasgow Glasgow G12 8LT UK

The optimisation of the controller's gains for an oil tanker control system using genetic algorithms is considered. Manual tuning of a PID controller's gains can be a very slow process so an optimisation technique based on genetic algorithms has been used to optimise the controller's gains. These gains have been optimised for two different configurations: course changing and course keeping.

关键词： Oil tanker control PID controller genetic algorithm optimisation

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Synthesis and optimisation of ENR-CR-HNBR ternary elastomeric blend and composites with hybrid CB-silica fillers for hard rubber mountings

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JOURNAL OF RUBBER RESEARCH 2025年第1期28卷 51-69页

作者： Vishnu, S. Prabu, B. Pugazhvadivu, M. Puducherry Technol Univ Dept Mech Engn Pondicherry 605014 India

The present work focuses on developing a novel composite using a ternary elastomeric blend of epoxidised natural rubber/chloroprene rubber/hydrogenated nitrile-butadiene rubber(ENR/CR/HNBR- ECH) with hybrid fillers in different proportions, aiming to partially replace conventional filler of carbon black with silica as a cheaper alternative to suitable for hard rubber mountings. The work has two parts, the first part deals with determination of optimum blends of ternary elastomers namely ENR, CR and HNBR using a simplex centroid mixture design model. Seven samples are prepared and tested for their mechanical properties using which the optimum combination is determined by adopting Grey Relation Analysis (GRA)-based Response Surface Methodology (RSM) approach and benchmarked using GRA based Kriging-GA surrogate optimisation. The confirmed optimum combination of ECH blend is 33.34/53.33/13.33 phr. Hence in the second part, this optimum blend is taken as the base matrix for developing novel hybrid filled ECH composites by varying the filler contents of CB and silica. Thirteen composites are fabricated following a Face Centered Central Composite (CCF) design and tested for mechanical properties. The optimisation of hybrid filler content is carried out following the same numerical techniques used for optimum blend determination. The optimum filler combination obtained is verified experimentally. Furthermore, these experimental studies are supported with morphological and ATR spectroscopic studies. Ternary elastomers are selected based on solubility *** fillers of CB and silica in ternary ENR/CR/HNBR *** fillers improved the physio-mechanical performance of ternary *** Relation Analysis converts multi-objective problem to single ***-based GA is a superior optimisation model than RSM-Desirability model.

关键词： Natural-synthetic ternary elastomeric blend Face-centred central composite design (CCF) Response surface methodology Grey relation analysis Kriging gaussian process regression genetic algorithm optimisation

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Hydrodynamic interactions of oscillating wave surge converters in an array under random sea state

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OCEAN ENGINEERING 2017年 145卷 382-394页

作者： Tay, Zhi Yung Venugopal, Vengatesan Singapore Inst Technol Engn Cluster 10 Dover Dr Singapore 138683 Singapore Univ Edinburgh Sch Engn Inst Energy Syst Edinburgh EH9 3JL Midlothian Scotland

The oscillating wave surge converter (OWSC) type devices (e.g., an Oyster wave energy converter) generate electric power via rotating motion about the bottom of the device. This type of wave energy converters have a wide power absorption bandwidth which enables the electricity generation at a wide range of wave frequencies. The power produced by the OWSCs could be maximised by configuring individual devices within an array. This paper examines the power production performance of multiple OWSCs in an array under regular, uni-directional irregular wave and multi-directional sea using the industry standard hydrodynamic software WAMIT. The performance of the OWSC array is represented as q-factor, which is a quantity defined as the ratio of the average total power produced in an array to the power produced by an individual OWSC. The results show that the OWSCs arranged in an array would produce both constructive and destructive interferences depending on the wave directions and frequencies. Further, the spreading function, the resonance bandwidth and the optimal spacing between the devices are shown to affect the performance of the OWSC significantly. The results provide an enhanced understanding of the behaviour and performance of the OWSCs when arranged in an array of different configurations.

关键词： Oscillating wave surge converter array q-factor Hydrodynamic interactions Power performance genetic algorithm optimisation

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Comparative study of three modified sCO2 Brayton recompression cycles based on energy and exergy analysis with GA optimisation

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INTERNATIONAL JOURNAL OF EXERGY 2021年第2期35卷 241-262页

作者： Li, Chunlei Eri, Qitai Beihang Univ Sch Energy & Power Engn 37 Xueyuan Rd Beijing Peoples R China

As one popular supercritical CO2 (sCO(2)) power cycle, the recompression cycle has attracted various modifications. However, comparative studies are still required to determine whether these modifications are necessary. In this paper, three modifications on the original recompression cycle(I) are compared, which are reheating cycle(II), partial cooling cycle(III), and reheated partial cooling cycle(IV). Thermodynamic states are calculated based on the recuperator effectiveness, and the split ratio, reheating pressure and pre-cooling pressure are calculated by genetic algorithm (GA). The thermal efficiencies are calculated as 40.01%, 40.44%, 39.88%, and 41.63%. The exergy efficiencies are 55.49%, 56.07%, 55.27% and 57.69%. It reveals that only reheated partial cooling cycle improves the performance, neither reheating cycle nor partial cooling cycle. This conclusion is not limited to specific parameters as the parametric study indicates. One explanation from the exergy analysis is that the reheated partial cooling cycle combines the edges of both reheating and partial cooling modifications.

关键词： sCO(2) Brayton cycle recompression cycle exergy analysis genetic algorithm optimisation

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Effects of Manufacturing Tolerances on Double-Wall Effusion Cooling

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JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME 2024年第1期146卷 011009-011009页

作者： van de Noort, Michael Ireland, Peter T. Telisinghe, Janendra C. Univ Oxford Dept Engn Sci Oxford OX1 3PJ England Rolls Royce PLC Turbine Syst Bristol BS34 7QE England

As aeroengine designers seek to raise turbine entry temperatures for greater thermal efficiencies, novel cooling schemes are required to ensure that components can survive in increasingly hotter environments. By utilizing a combination of impingement cooling, pin-fin cooling, and effusion cooling, double-wall effusion cooling is well equipped to achieve the high metal cooling effectiveness required for such challenges while keeping coolant consumption at an acceptably low level. However, this high performance can drop off within the variability of common manufacturing tolerances, which can also expose cooling schemes to issues such as hot gas ingestion. This paper uses an experimentally validated low-order flow network model (LOM) to assess the cooling performance of a double-wall effusion cooling scheme employed in a high-pressure turbine nozzle guide vane, subject to the variability of geometric parameters set by their manufacturing tolerances. The relative significance of each geometric parameter is examined by varying it individually and comparing the effects on the cooling performance. A Monte Carlo analysis is then conducted to assess the likelihood of performance variation for a baseline design. Finally, multiple optimization studies are conducted for the cooling scheme, with the simultaneous objectives of reducing coolant usage and maximizing the design tolerances to reduce manufacturing cost, all while maintaining acceptable metal cooling effectiveness and backflow margins.

关键词： flow networks double-wall effusion cooling manufacturing tolerances heat transfer and film cooling Monte Carlo analysis genetic algorithm optimisation

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Experimental study of semi-active magnetorheological elastomer base isolation system using optimal neuro fuzzy logic control

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2019年 119卷 380-398页

作者： Gu, Xiaoyu Yu, Yang Li, Yancheng Li, Jianchun Askari, Mohsen Samali, Bijan Univ Technol Sydney Sch Civil & Environm Engn Sydney NSW 2007 Australia Nanjing Tech Univ Coll Civil Engn Nanjing 211800 Jiangsu Peoples R China Western Sydney Univ Ctr Infrastruct Engn Penrith NSW 2751 Australia

In this paper, a "smart" base isolation strategy is proposed in this study utilising a semi active magnetorheological elastomer (MRE) isolator whose stiffness can be controlled in real-time and reversible fashion. By modulating the applied current, the horizontal stiffness of the MRE isolator can be controlled and thus the control action can be generated for the isolated structure. To overcome the inherent nonlinearity and hysteresis of the MRE isolator, radial basis function neural network based fuzzy logic control (RBF-NFLC) was developed due to its inherent robustness and capability in coping with uncertainties. The NFLC was optimised by a non-dominated sorting genetic algorithm type II (NSGA-II) for better suited fuzzy control rules as well as most appropriate parameters for the membership functions. To evaluate the effectiveness of the proposed smart base isolation system, four scenarios are tested under various historical earthquake excitations, i.e. bare building with no isolation, passive isolated structure, MRE isolated structure with Bang Bang control, MRE isolated structure with proposed NFLC. A three-storey shear building model was adopted as the testing bed. Through the testing results, limited performance of passive isolation system was revealed. In contrast, the adaptability of the proposed isolation strategy was demonstrated and it is proven that the smart MRE base isolation system is able to provide satisfactory protection for both structural and non-structural elements of the system over a wide range of hazard dynamic loadings. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Base isolation Magnetorheological elastomer (MRE) Smart structure Seismic protection Neuro fuzzy logic control genetic algorithm optimisation

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Parameter study and shape optimisation of a generalised ellipse dimple-textured face seal

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LUBRICATION SCIENCE 2020年第1期32卷 10-20页

作者： Kou Guiyue Li Xinghu Wang Yan Lin Mouyou Zhou Kanran Mu Mingfei Beihang Univ Sch Transportat Sci & Engn Beijing 100083 Peoples R China Nanchang Inst Technol Sch Mech & Elect Engn Nanchang Jiangxi Peoples R China

A new type of generalised ellipse dimple has been introduced to improve load-carrying capacity (LCC) of gas face seal. Theoretical model was developed to study the influence of key geometrical parameters of generalised ellipse dimple texture on LCC and leakage rate of gas face seal. Then the optimised shape of dimples for maximum LCC under different working conditions were obtained using genetic algorithm method. It is observed that generalised ellipse dimple with proper unit number and long axis included angle can enhance LCC and make a better balance between LCC and sealing characteristics of gas face seal compared with conventional ellipse or circle dimple at high speed. Dimple-textured gas face seal with multirow radial dimples outperforms that with single-row radial dimple on sealing characteristics.

关键词： dimple texture gas face seal genetic algorithm optimisation load-carrying capacity parametric study sealing characteristics

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Design of a low-cost broadband loaded dipole antenna for VHF/UHF frequency range

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IET MICROWAVES ANTENNAS & PROPAGATION 2019年第12期13卷 1983-1988页

作者： Bod, Mohammad Ahmadi-Boroujeni, Mehdi Mohammadpour-Aghdam, Karim Amirkabir Univ Technol Dept Elect Engn Tehran Iran Sharif Univ Technol Dept Elect Engn Tehran Iran Univ Tehran Sch Elect & Comp Engn Tehran Iran

This study describes the concept and design of a low-cost super broadband dipole antenna with a passive matching network. The proposed dipole antenna is designed in three steps. First, a simple planar dipole antenna with six different loads and a balanced to unbalanced (Balun) transformer is designed by the genetic algorithm optimisation. The position and value of the loads are optimised to achieve an acceptable radiation pattern and voltage standing wave ratio (VSWR) over the desired frequency bandwidth. In the next step, the shape of the printed strip dipole antenna is optimised to improve the frequency response of the designed antenna. Finally, an LC network is added to the antenna feed point to reduce the antenna VSWR at low frequencies. The final dipole antenna has a length of 1.7 m and can operate over 30-1200 MHz with VSWR <3 and broadside gain >-10 dBi. The proposed antenna can easily be fabricated at a low cost via the printed circuit board technology. An industrial prototype of the proposed antenna is fabricated and measured. A good agreement between measurement and simulation results is observed.

关键词： genetic algorithms antenna feeds antenna radiation patterns UHF antennas broadband antennas dipole antennas VHF antennas passive networks transformers microstrip antennas LC circuits printed circuit manufacture passive matching network unbalanced transformer genetic algorithm optimisation printed strip dipole antenna frequency response antenna feed point planar dipole antenna antenna radiation pattern VSWR super broadband dipole antenna VHF-UHF frequency range broadband loaded dipole antenna balun LC network printed circuit board technology frequency 30 0 MHz to 1200 0 MHz size 1 7 m

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Active carbody roll control in railway vehicles using hydraulic actuation

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CONTROL ENGINEERING PRACTICE 2014年 31卷 24-34页

作者： Colombo, Edoardo F. Di Gialleonardo, Egidio Facchinetti, Alan Bruni, Stefano Politecn Milan Dipartimento Meccan I-20156 Milan Italy

Carbody tilting is used in railway vehicles to reduce the exposure of passengers to lateral acceleration in curves, allowing these to be negotiated at higher speeds with the same level of comfort. This, however, requires a rather complex actuation system that increases vehicle weight and reduces space for passengers. This paper introduces a new concept that provides a limited amount of carbody tilt using hydraulic actuation. The device consists of interconnected hydraulic actuators attached to the carbody and bogies, replacing the passive anti-roll bar used in railway vehicles and in addition permitting active tilt control. Three control strategies for the active hydraulic suspension are proposed, and the regulator gains are defined using genetic algorithm optimisation, based on numerical simulation of the running behaviour of the actuated railway vehicle in a high-speed curve. Finally, the performance of the actuated vehicle is assessed on the basis of numerical simulations, showing it is possible to increase significantly the vehicle's running speed in fast curves compared with a vehicle equipped with passive suspension. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Railway vehicles Active suspension Car body tilting Ride quality genetic algorithm optimisation

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