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An Improved Genetic Algorithm for Crew Pairing Optimization

Journal of Intelligent Learning Systems and Applications 2012年第1期4卷 70-80页

作者： Bahadir Zeren ibrahim ozkol Faculty of Aeronautics and Astronautics Istanbul Technical UniversityIstanbulTurkey.

Crew pairing is a sequence of flights beginning and ending at the same crewbase. Crew pairing planning is one of the primary processes in airline crew scheduling;it is also the primary cost-determining phase in airline crew scheduling. Optimizing crew pairings in an airline timetable helps minimize operational crew costs and maximize crew utilization. There are numerous restrictions that must be considered and just as many regulations that must be satisfied in crew pairing generation. The most important regulations—and the ones that make crew pairing planning a highly constrained optimization problem—are the the limits of the flight and the duty periods. Keeping these restrictions and regulations in mind, the main goal of the optimization is the generation of low cost sets of valid crew pairings which cover all flights in the airline’s timetable. For this research study, We examined studies about crew pairing optimization and used these previously existing methods of crew pairing to develop a new solution of the crew pairing problem using genetic algorithms. As part of the study we created a new genetic operator—called perturbation *** traditional genetic algorithm implementations, this new perturbation operator provides much more stable results, an obvious increase in the convergence rate, and takes into account the existence of multiple crewbases.

关键词： Optimization Genetic Algorithms Crew Planning Crew Pairing Crew Pairing Optimization Airline Crew Planning Airline Crew Pairing Airline Crew Pairing Optimization

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Classical and Fractional-Order Analysis of the Free and Forced Double Pendulum

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Engineering（科研） 2010年第12期2卷 935-949页

作者： Elmas Anli ibrahim ozkol 不详

This paper presents the fractional-order dynamics of the double pendulum by means of fractional-order modeling. Equations of motion have been derived for cases with and without external forcing. Generalized force terms have been obtained for five different cases of forcing. Both integer and fractional-order analysis have been carried out. Phase diagrams have been plotted to visualize the effect of fractional order approach. The originality of this work arises from the fact that the double pendulum has been modeled with the fractional dynamics approach. The governing equations of motion of the system have been obtained through fractional variational principles.

关键词： Double Pendulum Fractional Dynamics Lagrangian Dynamics

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Wind Turbine Tower Optimization under Various Requirements by Using Genetic Algorithm

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Engineering（科研） 2010年第8期2卷 641-647页

作者： Serdar Yildirim ibrahim ozkol Faculty of Aeronautics and Astronautics Istanbul Technical UniversityIstanbulTurkey

The purpose of this study is to optimize the mass of 1.5 MW wind turbine steel tower performing Genetic Algorithm method (GA). In accordance with ASCE 7-98, AISC-89 and IEC61400-1 , the impact of loads on tower is calculated within the highest safety conditions against buckling strength of each sections of tower by means of GA codes. The stifness along tower is ensured entirely while the mass of tower is mitigated and optimized.

关键词： Mass Optimization Genetic Algorithm Wind Turbine Tower

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Design and Kinematics Analysis of a Parallel Mechanism to be Utilized as a Luggage Door by an Analogy to a Four – Bar Mechanism

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Engineering（科研） 2011年第4期3卷 411-421页

作者： Burak Baykus Elmas Anli ibrahim ozkol 不详

In this study, a luggage door mechanism to be used in commercial vehicles such as midibuses and buses is designed and analyzed. The mechanism is designed as a parallel hinged system. Velocities, rotational veloci- ties and rotational accelerations of selected points on the design are calculated. Furthermore, the experiment- tal model of the design is established and it is seen that the data taken from the model are compatible with the calculated results. The aim of this study is to design a mechanism with the minimal workspace so that the door can be utilized in narrow areas and the ergonomics of the luggage door is improved. Considering both commercial and passenger vehicle sales, vehicle interior and exterior trim features have an exceptionally important role in automotive industry, in addition to vehicle performance characteristics. In today’s compete- tive environment, parts used in a vehicle’s internal and external trim have to meet user demands in terms of ergonomics as well as aesthetics. Due to its similarity to a four-bar mechanism, kinematics analysis of the design was carried out based on a four-bar mechanism, which is used extensively in industry.

关键词： Four-Bar Mechanism Trunk Lid Mechanism Design

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