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Papers by Ahmet Ceranoglu

Research paper thumbnail of Experiments with a well-characterized acoustic emission system

Ultrasonics International 79, 1979

Research paper thumbnail of A TSP (1,2) application arising in cable assembly shops

The Journal of the Operational Research Society, Mar 16, 2005

One of the main operations in producing cable systems in automotive industry is that of cutting/s... more One of the main operations in producing cable systems in automotive industry is that of cutting/stripping/crimping. The most time consuming activity in this operation is changing the heads whenever a different connector is to be crimped at either one of the ends. This setup time is practically doubled when the heads at both ends are to be changed. Thus, one is faced with the problem of minimizing the total machine set up time; which turns out to be a TSP where the distances between the nodes are either one or two. A simple and effective heuristic algorithm is developed that yields solutions which are only a few percent above the optimum in the worst case.

Research paper thumbnail of Acoustic emission and propagation of elastic pulses in a plate

Ph D Thesis Cornell Univ Ithaca Ny, 1979

The transient response of an elastic, isotropic, homogeneous infinite plate due to point sources ... more The transient response of an elastic, isotropic, homogeneous infinite plate due to point sources including an arbitrarily oriented concentrated force, single couple, double force, center of rotation, and a double couple without moment is presented. These sources or a ...

Research paper thumbnail of A generic transformation of advanced materials technologies: Towards more integrated multi-materials systems via customized R&D and Innovation

The Journal of High Technology Management Research, 2015

ABSTRACT

Research paper thumbnail of Automated assembly of printed circuit boards: iterative solution of placement sequencing and feeder configuration problems

In automated assembly of printed circuit boards, the placement sequencing and feeder configuratio... more In automated assembly of printed circuit boards, the placement sequencing and feeder configuration problems turns out to be two of the four major problems that need to be solved efficiently to get better utilization from the use of computer controlled electronic component placement machines. The forms of these problems may show variability depending on the architecture of the placement machine used. In this study one of such machine architectures is undertaken where the most difficult combination of placement sequencing and feeder configuration problems is faced. Given a placement sequencing problem, the feeder configuration problem turns out to be a quadratic assignment problem, and given a feeder configuration the placement sequencing problem turns out to be a traveling salesman problem. However these two problems are highly interdependent and as the overall solution is intractable a sequential and iterative solution procedure is suggested. The proposed solution procedure is applied to test problems in real printed circuit board assembly environments.

Research paper thumbnail of Optimizing crimping operations in cable assembly shops

Long setup times are incurred in the crimping operation of automotive cable assembly shops. Diffe... more Long setup times are incurred in the crimping operation of automotive cable assembly shops. Different heads are used to crimp different connectors to the end of operators where the heads on a machine can be changed one by one. These heads are quite expensive and the manufacturers avoid having more then one of each type. In such a manufacturing environment where multiple crimping machines are used the primary objective is to minimize the total time spent to setups. Also, it is desirable to have a schedule so that simultaneous use of the same head on more than one machine is avoided. In previous research there are some works on the first objective and two successful heuristics are proposed. In this study we cope for the second objective also and propose two comparable heuristic algorithms.

Research paper thumbnail of Absolute Ultrasonic Measurements with Piezoelectric Transducers

1979 Ultrasonics Symposium, 1979

The absolute calibration of a piezoelectric transducer refers to the determination of the relatio... more The absolute calibration of a piezoelectric transducer refers to the determination of the relationship between the electrical and acoustical quantities for a transducer coupled to a solid. It is shown how a well-characterized ultrasonic system, consisting of source,structure and receiver can be used to make such measurements for transducers operating as sources or receivers. Results are given, showing the effects of coupling between transducer and solid and the electrical characteristics of the associated source and receiver electronics.

Research paper thumbnail of A TSP (1,2) application arising in cable assembly shops

Journal of the Operational Research Society, 2005

One of the main operations in producing cable systems in automotive industry is that of cutting/s... more One of the main operations in producing cable systems in automotive industry is that of cutting/stripping/crimping. The most time consuming activity in this operation is changing the heads whenever a different connector is to be crimped at either one of the ends. This setup time is practically doubled when the heads at both ends are to be changed. Thus, one is faced with the problem of minimizing the total machine set up time; which turns out to be a TSP where the distances between the nodes are either one or two. A simple and effective heuristic algorithm is developed that yields solutions which are only a few percent above the optimum in the worst case.

Research paper thumbnail of Acoustic emission and transient waves in an elastic plate

The Journal of the Acoustical Society of America, 1979

To study the mechanism of the source of acoustic emission, we analyze the transient waves which a... more To study the mechanism of the source of acoustic emission, we analyze the transient waves which are generated by four kinds of point sources, a single force, double force, and center of dilatation, all inside an infinite plate, and a single force on the surface of the plate. Some ...

Research paper thumbnail of Propagation of Elastic Pulses and Acoustic Emission in a Plate—Part 1: Theory

Journal of Applied Mechanics, 1981

Transient waves generated by a variety of dynamic nuclei of strains including a concentrated forc... more Transient waves generated by a variety of dynamic nuclei of strains including a concentrated force, a single-couple, a double-force, a double-couple without moment, a center of rotation, and a center of explosion in an elastic plate are analyzed. Some of these sources, or a combination of them, could be used to model the dynamic process of material defects. The analysis is based on the generalized ray theory and Cagniard’s method and the solutions are presented in terms of Green’s dyadics for a plate.

Research paper thumbnail of Determination of Transient Responses of a Thick-Walled Spherical Shell by the Ray Theory

Journal of Applied Mechanics, 1978

The dynamic response of a thick-walled elastic spherical shell subject to radially symmetric load... more The dynamic response of a thick-walled elastic spherical shell subject to radially symmetric loadings is studied by applying the theory of rays. The Fourier transformed solution of the waves in the shell is sorted out into rays by following the ray-path of the multiply reflected waves at both surfaces. Inverse transform of each ray, which is obtainable in closed form, gives rise to the exact solution of the transient response up to the arrival time of the next ray. Numerical results are shown for internally applied pressure with a step or a square-time function. The radial stresses are found to be critically large in tension due to multiple reflections at both surfaces of a thick shell.

Research paper thumbnail of VRP12 (vehicle routing problem with distances one and two) with side constraints

International Journal of Production Economics, 2013

ABSTRACT

Research paper thumbnail of Operations Sequencing in a Cable Assembly Shop

dogus.edu.tr

Abstract: The need for a better, compact and neat solution in the cable systems used by the autom... more Abstract: The need for a better, compact and neat solution in the cable systems used by the automotive industry resulted in emerge of companies specialized in producing such cable systems. The present study is an extension of the work that was carried out for one such ...

Research paper thumbnail of Experiments with a well-characterized acoustic emission system

Ultrasonics International 79, 1979

Research paper thumbnail of A TSP (1,2) application arising in cable assembly shops

The Journal of the Operational Research Society, Mar 16, 2005

One of the main operations in producing cable systems in automotive industry is that of cutting/s... more One of the main operations in producing cable systems in automotive industry is that of cutting/stripping/crimping. The most time consuming activity in this operation is changing the heads whenever a different connector is to be crimped at either one of the ends. This setup time is practically doubled when the heads at both ends are to be changed. Thus, one is faced with the problem of minimizing the total machine set up time; which turns out to be a TSP where the distances between the nodes are either one or two. A simple and effective heuristic algorithm is developed that yields solutions which are only a few percent above the optimum in the worst case.

Research paper thumbnail of Acoustic emission and propagation of elastic pulses in a plate

Ph D Thesis Cornell Univ Ithaca Ny, 1979

The transient response of an elastic, isotropic, homogeneous infinite plate due to point sources ... more The transient response of an elastic, isotropic, homogeneous infinite plate due to point sources including an arbitrarily oriented concentrated force, single couple, double force, center of rotation, and a double couple without moment is presented. These sources or a ...

Research paper thumbnail of A generic transformation of advanced materials technologies: Towards more integrated multi-materials systems via customized R&D and Innovation

The Journal of High Technology Management Research, 2015

ABSTRACT

Research paper thumbnail of Automated assembly of printed circuit boards: iterative solution of placement sequencing and feeder configuration problems

In automated assembly of printed circuit boards, the placement sequencing and feeder configuratio... more In automated assembly of printed circuit boards, the placement sequencing and feeder configuration problems turns out to be two of the four major problems that need to be solved efficiently to get better utilization from the use of computer controlled electronic component placement machines. The forms of these problems may show variability depending on the architecture of the placement machine used. In this study one of such machine architectures is undertaken where the most difficult combination of placement sequencing and feeder configuration problems is faced. Given a placement sequencing problem, the feeder configuration problem turns out to be a quadratic assignment problem, and given a feeder configuration the placement sequencing problem turns out to be a traveling salesman problem. However these two problems are highly interdependent and as the overall solution is intractable a sequential and iterative solution procedure is suggested. The proposed solution procedure is applied to test problems in real printed circuit board assembly environments.

Research paper thumbnail of Optimizing crimping operations in cable assembly shops

Long setup times are incurred in the crimping operation of automotive cable assembly shops. Diffe... more Long setup times are incurred in the crimping operation of automotive cable assembly shops. Different heads are used to crimp different connectors to the end of operators where the heads on a machine can be changed one by one. These heads are quite expensive and the manufacturers avoid having more then one of each type. In such a manufacturing environment where multiple crimping machines are used the primary objective is to minimize the total time spent to setups. Also, it is desirable to have a schedule so that simultaneous use of the same head on more than one machine is avoided. In previous research there are some works on the first objective and two successful heuristics are proposed. In this study we cope for the second objective also and propose two comparable heuristic algorithms.

Research paper thumbnail of Absolute Ultrasonic Measurements with Piezoelectric Transducers

1979 Ultrasonics Symposium, 1979

The absolute calibration of a piezoelectric transducer refers to the determination of the relatio... more The absolute calibration of a piezoelectric transducer refers to the determination of the relationship between the electrical and acoustical quantities for a transducer coupled to a solid. It is shown how a well-characterized ultrasonic system, consisting of source,structure and receiver can be used to make such measurements for transducers operating as sources or receivers. Results are given, showing the effects of coupling between transducer and solid and the electrical characteristics of the associated source and receiver electronics.

Research paper thumbnail of A TSP (1,2) application arising in cable assembly shops

Journal of the Operational Research Society, 2005

One of the main operations in producing cable systems in automotive industry is that of cutting/s... more One of the main operations in producing cable systems in automotive industry is that of cutting/stripping/crimping. The most time consuming activity in this operation is changing the heads whenever a different connector is to be crimped at either one of the ends. This setup time is practically doubled when the heads at both ends are to be changed. Thus, one is faced with the problem of minimizing the total machine set up time; which turns out to be a TSP where the distances between the nodes are either one or two. A simple and effective heuristic algorithm is developed that yields solutions which are only a few percent above the optimum in the worst case.

Research paper thumbnail of Acoustic emission and transient waves in an elastic plate

The Journal of the Acoustical Society of America, 1979

To study the mechanism of the source of acoustic emission, we analyze the transient waves which a... more To study the mechanism of the source of acoustic emission, we analyze the transient waves which are generated by four kinds of point sources, a single force, double force, and center of dilatation, all inside an infinite plate, and a single force on the surface of the plate. Some ...

Research paper thumbnail of Propagation of Elastic Pulses and Acoustic Emission in a Plate—Part 1: Theory

Journal of Applied Mechanics, 1981

Transient waves generated by a variety of dynamic nuclei of strains including a concentrated forc... more Transient waves generated by a variety of dynamic nuclei of strains including a concentrated force, a single-couple, a double-force, a double-couple without moment, a center of rotation, and a center of explosion in an elastic plate are analyzed. Some of these sources, or a combination of them, could be used to model the dynamic process of material defects. The analysis is based on the generalized ray theory and Cagniard’s method and the solutions are presented in terms of Green’s dyadics for a plate.

Research paper thumbnail of Determination of Transient Responses of a Thick-Walled Spherical Shell by the Ray Theory

Journal of Applied Mechanics, 1978

The dynamic response of a thick-walled elastic spherical shell subject to radially symmetric load... more The dynamic response of a thick-walled elastic spherical shell subject to radially symmetric loadings is studied by applying the theory of rays. The Fourier transformed solution of the waves in the shell is sorted out into rays by following the ray-path of the multiply reflected waves at both surfaces. Inverse transform of each ray, which is obtainable in closed form, gives rise to the exact solution of the transient response up to the arrival time of the next ray. Numerical results are shown for internally applied pressure with a step or a square-time function. The radial stresses are found to be critically large in tension due to multiple reflections at both surfaces of a thick shell.

Research paper thumbnail of VRP12 (vehicle routing problem with distances one and two) with side constraints

International Journal of Production Economics, 2013

ABSTRACT

Research paper thumbnail of Operations Sequencing in a Cable Assembly Shop

dogus.edu.tr

Abstract: The need for a better, compact and neat solution in the cable systems used by the autom... more Abstract: The need for a better, compact and neat solution in the cable systems used by the automotive industry resulted in emerge of companies specialized in producing such cable systems. The present study is an extension of the work that was carried out for one such ...