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Vibration Noise Harshness of a Light Truck Driveshaft, Analysis and Improvement with Six Sigma Approach

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Ertürk A., Karabay S., Baynal K., Korkut T.
Acta Physica Polonica A
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2017
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vol. 131
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issue 3
477-480
EN
This paper deals with the application of six sigma methodology for optimization of a cardan shaft. The aim of this optimization is to reduce vibration of the drive shaft and consequently improve vibration noise harshness of the vehicle. The six sigma methodology has been applied to a light truck, which has received excessive vibration and noise complaints. The define-measure-analyze-improve-control approach has been followed to enhance the vibration noise harshness statistics. The result shows that all expected vibration noise harshness performance targets have been dramatically improved when compared to the initial values. As a conclusion, the case study on a light truck is a useful reference to improve vehicle performance for vibration noise harshness.
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Influence of Different Heat Treatments on the Solid Particle Erosion Behavior of Aluminum Alloy AA 7075 in Industrial Applications

100%
Karabay S., Bayraklılar M., Balcı E.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1052-1054
EN
In this study, the solid particle erosion behavior of solutionized, artificially aged (T6) and annealed aluminum alloy AA7075 has been investigated. The samples were eroded in solid particle erosion test equipment at 45° impingement angle and 75 m/s impingement velocity with 180 mesh garnet erodent particles. Afterwards, microstructures of solutionized, artificially aged and annealed samples of AA7075 alloy were analyzed. In order to figure out the effect of ductility on erosion rates, the Brinell hardness of the samples was measured. The surface morphology images of the samples were taken before and after the erosion test by using scanning electron microscope (SEM). The effects of the microstructures and the hardness on the erosion behavior of the different heat treated specimens were examined. Finally, SEM images of the samples were deeply analyzed and the erosion mechanisms which occurred on the surfaces of the samples were discussed.
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Manufacturing of Al-Zr Thermal-resistant Alloys for Transmission Lines

100%
Erturk A., Guven E., Karabay S.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 4
1292-1294
EN
The present transmission lines of populous cities will have to be changed with an ability to work at higher temperatures without any weight and cross section changes. Innovative thermal-resistant alloy conductors (T-ACSR) operate in the range of about 150-200°C instead of 75°C which is the standard ACSR type conductor service temperature. In this study, the manufacturing procedure of Al-Zr alloy wire, used as high-temperature conductor wires, have been introduced. The Al-Zr alloy has been cast in a permanent mold than being extruded to a diameter of 10 mm at 400°C. After that the extruded rods have been cold drawn to a diameter of 3.02 mm. Elongation and tensile strength values of the cold drawn wire have been achieved by tensile test at elevated temperatures. Also, microstructural analysis and dispersion hardening procedure have been investigated. The results show that tensile strength and thermal-resistant property are improved by the addition of Zr.
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