Makine Mühendisliği Bölümü

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Citation Count: Afsin, Mehmet Ertug; Schmidt, Klaus Werner; Schmidt, Ece Guran, "C-3 : configurable CAN FD controller: architecture, design and hardware implementation", 2017 12th IEEE Internatıonal Symposium On Industrial Embedded Systems (SIES), pp.73-81, (2017).
C-3 : configurable CAN FD controller: architecture, design and hardware implementation
(IEEE, 2017) Afşin, Mehmet Ertuğ; Schmidt, Klaus Werner; Schmidt, Ece Güran
CAN FD (Controller Area Network with Flexible Data Rate) is a new standard which provides a fast data rate while preserving the compatibility with CAN. In this paper, we propose the C-3 (Configurable CAN FD Controller) IP core architecture, which is compatible with the non-ISO CAN FD standard. C-3 supports up to 96 transmit and receive buffers. The transmit buffers are organized as mailboxes with CAN ID prioritization in frame transmission. A separate filter mask that can be configured by the user exists for each receive buffer. Different from existing CAN/CAN FD controllers, the numbers and sizes of transmit and receive buffers of C-3 can be configured at run time. To this end, C-3 enables the best use of a single controller hardware for different applications and enables improving the real-time communication performance. C-3 communicates with the host device over SPI without any specific interface requirements using the protocol that is developed in the scope of this paper. C-3 is implemented on an FPGA Evaluation Board and its functionality is verified at a data rate of 2 Mbps.
Citation Count: Yapici, Ekin Ozgirgin; Devrim, Yilser, "Experimental Study and Theoretical Investigation of High Temperature Proton Exchange Membrane Fuel Cell Micro-Cogeneration Application", Isı Bilimi ve Tekniği Dergisi-Journal of Thermal Science and Technology, 38, No. 1, pp. 73-82, (2018).
Experimental Study and Theoretical Investigation of High Temperature Proton Exchange Membrane Fuel Cell Micro-Cogeneration Application
(Turkish Soc Thermal Sciences Technology, 2018) Yılser, Devrim; Yapıcı, Eyüp; 31329
In this study, a house hold micro-cogeneration system is designed using high temperature proton exchange membrane (HTPEM) fuel cell. HTPEM type fuel cells gain the highest interest lately, due to their advantages in terms of increasing efficiency and power quality, reducing harmful emissions and flexibility of operation with respect to the other fuels. The micro-cogeneration system involves producing both electrical energy and hot water and/or vapor together in an economical way, utilizing single fuel (HTPEM fuel cells) for household applications. During the operation of the fuel cell, for high efficiency and stable power production, the access heat of the stack should be removed constantly and the temperature of the stack should be held stable. Heat recovered from the designed innovative cooling system is used for acquiring energy for heating water. This way, thermal efficiency is almost doubled compared to simple cycle. In the scope of this study, 225 W HTPEM fuel cell stack is designed and tested at 160 degrees C operation temperature with hydrogen gas and air. During operation, for homogenous distribution of temperature among the cells, for a short start up period leading to a fast required steady state temperature and for constantly removing the access heat produced in the cell, the cell stack is cooled by using a cooling fluid (Heat Transfer Oil 32- Petrol Ofisi). Selection of insulation material type and thickness for the cell stack is done using natural convection and radiation loss calculations. For the most efficient operating conditions, micro-cogeneration system water inlet and exit temperatures, water and cooling fluid flow rates, convenient pipe diameter and pump power calculations are done to finalize the design. With the cogeneration system designed during the studies, by recovering the access heat of the insulated HTPEM cell stack, district water with initial temperature of 15-20 degrees C is heated around 50 degrees C. Data gathered during studies indicate that fuel cell micro-cogeneration application is highly viable.
Citation Count: Liu, Qian...et al. " Modelling and simulations of nanoindentation in single crystals", Applied Nanoindentation İn Advanced Materials, pp.561-577, (2017).
Modelling and simulations of nanoindentation in single crystals
(John Wiley and Sons LTD., 2017) Liu, Qiang; Demiral, Murat; Roy, Anish; Silberschmidt, Vadim V.
Citation Count: Kahroba, Mitra; Türkoğlu, Haşmet, "Numerical analysis of pulsating circular impinging laminar jet on a planar disc", Isı Bilimi Ve Teknigi Dergisi-Journal Of Thermal Science And Technology, Vol.37, No.2, pp.89-95, (2017).
Numerical analysis of pulsating circular impinging laminar jet on a planar disc
(Turkish Soc Thermal Sciences Technology, 2017) Kahroba, Mitra; Türkoğlu, Haşmet; 12941
In this study, the flow and heat transfer characteristics of pulsating circular air jets impinging on a flat surface were numerically analyzed. The jet velocity pulsated in time. The objective of the work is to investigate the influence of the jet Reynolds number, pulsation amplitude and pulsation frequency on the rate of heat transfer from the target hot surface. For the analysis, a computer program, based on the control volume method and SIMPLE algorithm, was developed. Laminar flow with the time averaged jet Reynolds numbers between 300 and 700 were analyzed. The pulsation amplitude is ranged between 0.0V(0) (steady jet) and 0.8V(0) (m/s) (V-0 is period averaged jet velocity), and the frequency is ranged between 1 and 6 Hz. The nozzle-to-plate distance was kept constant at H/d=3. From the simulation results, it was observed that at any instant of the pulsation period, the local Nusselt number is maximum at the stagnation point, and it decreases along the plate. This decrease in the local Nusselt number is not monatomic as in the steady jet cases. It has local maximum and minimum values (fluctuations) due to the moving recirculating flow regions along the bottom plate. At low frequencies, the time (period) averaged stagnation point Nusselt numbers are lower than the corresponding steady jet Nusselt numbers. However, with the increasing frequency, the stagnation point Nusselt number increases and become higher than the steady jet Nusselt number.
Citation Count: Batur, Ahmet; Schmidt, Klaus Werner; Schmidt, Ece Guran, "Offset assignment on controller area network: improved algorithms and computational evaluation", 2017 12th IEEE International Symposium On Industrial Embedded Systems (SIES), pp.82-90, (2017).
Offset assignment on controller area network: improved algorithms and computational evaluation
(IEEE, 2017) Batur, Ahmet; Schmidt, Klaus Werner; Schmidt, Ece Güran
The basic requirement for the design of the Controller Area Network (CAN) for in-vehicle communication is to guarantee that the worst-case response time (WCRT) of each message is smaller than their specified deadline. In addition, it is desired to achieve small WCRTs that leave sufficient slack to the message deadline. In order to address the specified objectives, the idea of offset scheduling has been introduced. In this setting, messages on CAN are released with offsets in order to avoid message bursts that lead to undesirably large response times. In order to use offset scheduling efficiently, it is required to assign a suitable offset to each message. To this end, a load distribution (LD) algorithm is proposed in the existing literature. The main contribution of this paper is the development of new algorithms for offset assignment on CAN. Evaluating different example scenarios, the paper shows that the proposed algorithms outperform the existing LD algorithm in most of the cases.

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Browsing Makine Mühendisliği Bölümü by Department "Çankaya Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği"