Yazar "Celik, Veli" için listeleme
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An elasto-viscoplastic analysis of direct extrusion of a double base solid propellant
Kalaycioglu, Baris; Dirikolu, M. Husnu; Celik, Veli (Elsevier Sci Ltd, 2010)In this study, three-dimensional modelling of extrusion forming of a double base solid rocket propellant is performed on Ansys (R) finite element analysis program. Considering the contact effects and the time dependent ... -
Experimental investigation of the factors affecting the burning rate of solid rocket propellants
Yaman, Hayri; Celik, Veli; Degirmenci, Ercan (Elsevier Sci Ltd, 2014)The burning rate of the solid rocket propellants is one of the most important factors that determine the performance of the rocket. The burning rate of rocket motors running with solid propellant is called flame regression, ... -
The minimization of absolute deviation from common due date in two machine flowshop scheduling with learning effect
Isler, Mesut Cemil; Celik, Veli; Toklu, Bilal (Gazi Univ, Fac Engineering Architecture, 2009)The phenomenon of the learning effect has been extensively studied in many different areas of operational research. However, there have been a few studies in the general context of production scheduling; also there have ... -
Optimization of mechanical (Swage) autofrettage process
Celik, Veli; Gungor, Onur; Yildirim, Halil (Gazi Univ, Fac Engineering Architecture, 2019)Autofrettage is the process of residual stress formation on the walls of the thick walled cylinders before their usage. These residual stresses help to increase the pressure bearing capacity of the thick walled cylinders ... -
Scheduling in a two-machine flow-shop for earliness/tardiness under learning effect
Isler, Mesut Cemil; Toklu, Bilal; Celik, Veli (Springer London Ltd, 2012)In the literature, earliness/tardiness (E/T) problem was known as weighted absolute deviation problem, and both tardiness and earliness is very important performance criteria for scheduling problem. While total tardiness ... -
Sliding Friction and Wear Behavior of Pack-Boronized AISI 1050, 4140, and 8620 Steels
Soydan, Yavuz; Koksal, Sakip; Demirer, Ahmet; Celik, Veli (Taylor & Francis Inc, 2008)This paper describes the dry sliding friction and wear performance of boronized AISI 1050, 4140, and 8620 steels with the Fe(2)B phase coating on the surface. The studies were carried out using a pin-on-disc arrangement. ... -
Theoretical and experimental investigation of acoustic performance of multi-chamber reactive silencers
Arslan, Hakan; Ranjbar, Mostafa; Secgin, Erkan; Celik, Veli (ELSEVIER SCI LTD, 2020)The acoustic attenuation and performance analysis for blast flow field inside a silencer is investigated. In this regard, a silencer system is designed to reduce the exhaust noise. The effect of position and the number of ...