Mekatronik Mühendisliği Bölümü

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Citation Count: Afsin, Mehmet Ertug; Schmidt, Klaus Werner; Schmidt, Ece Guran, "A configurable CAN FD controller: architecture and implementation", 2017 25th Signal Processing And Communications Applications Conference (SIU), (2017).
A configurable CAN FD controller: architecture and implementation
(IEEE, 2017) Afşin, Mehmet Ertuğ; Schmidt, Klaus Werner; Schmidt, Ece Güran
CAN FD is a new standard which provides fast. data rate while preserving the compatibility with CAN (controller area network). In this paper, a Configurable IP core architecture (A-CAN) which is compatible with the CAN FD standard, is proposed. Different than existing CAN/CAN FD controllers, the numbers and sizes of transmit and receive buffers of A-CAN can be configured in run time. To this end, A-CAN enables the best use of single controller hardware for different applications and enables improving the real time communication performance. A CAN communicates with the host device over SPI without any specific interface requirements. A-CAN is implemented on an FPGA Evaluation Board and its functionally is verified at a rate of 2 Mbps.
Citation Count: Leblebicioglu, M. Kemal; Zengin, Yasin; Schmidt, Klaus Werner, "A new multi-agent decision making structure and application to model-based fault diagnosis problem", 2017 25th Signal Processing And Communications Applications Conference (SIU), (2017).
A new multi-agent decision making structure and application to model-based fault diagnosis problem
(IEEE, 2017) Leblebicioğlu, Kemal; Zengin, Yasin; Schmidt, Klaus Werner
A new hierarchical multi-agent decision-making structure has been proposed. There are two phases of the structure. The first phase is the construction phase where the decision making structure consisting of switching and classification agents is built on the training data set generated by the system scenarios. In construction phase, switching and classification agents are trained and made ready for decision making. In the decision phase, which is the second phase, the class of the new data sample is decided. This process is carried out by the transmission of the data sample to the correct classifier agent by the switching agents and the classification by the classifier agent. The proposed structure is applied to a complex fault identification problem and a successful result is obtained. The structure is also adaptable to other big data decision making problems.
Citation Count: Schmidt, Klaus W., "Cooperative adaptive cruise control for vehicle following during lane changes", Ifac Papersonline, Vol.50, No.1, pp. 12582-12587, (2017).
Cooperative adaptive cruise control for vehicle following during lane changes
(Elsevier Science BV, 2017) Schmidt, Klaus Werner
This paper addresses the longitudinal vehicle behavior before and during lane changes. Hereby, it is desired that the lane-changing vehicle simultaneously follows its predecessors on the lanes before and after the lane change. Specifically, the lane changing vehicle should keep a safe distance to the rearmost predecessor vehicle, while maintaining a small inter vehicle spacing and supporting driving comfort. To this end, the paper develops an extension of cooperative adaptive cruise control (CACC). Instead of following a single vehicle as in the classical realization of CACC, it is proposed to follow a virtual vehicle that is evaluated based on distance measurements and communicated state information from the predecessor vehicles. A simulation study demonstrates the practicability of the proposed method.
Citation Count: Schmidt, Klaus Werner, "Reconfigurability of behavioural specifications for manufacturing systems", International Journal Of Control, Vol.90, No.12, pp.2605-2617, (2017).
Reconfigurability of behavioural specifications for manufacturing systems
(Taylor&Francis, 2017) Schmidt, Klaus Werner
Reconfigurable manufacturing systems (RMS) support flexibility in the product variety and the configuration of the manufacturing system itself in order to enable quick adjustments to new products and production requirements. As a consequence, an essential feature of RMS is their ability to rapidly modify the control strategy during run-time. In this paper, the particular problem of changing the specified operation of a RMS, whose logical behaviour is modelled as a finite state automaton, is addressed. The notion of reconfigurability of specifications (RoS) is introduced and it is shown that the stated reconfiguration problem can be formulated as a controlled language convergence problem. In addition, algorithms for the verification of RoS and the construction of a reconfiguration supervisor are proposed. The supervisor is realised in a modular way which facilitates the extension by new configurations. Finally, it is shown that a supremal nonblocking and controllable strict subautomaton of the plant automaton that fulfils RoS exists in case RoS is violated for the plant automaton itself and an algorithm for the computation of this strict subautomaton is presented. The developed concepts and results are illustrated by a manufacturing cell example.
Citation Count: Moor, Thomas; Schmidt, Klaus Werner, "The controllability prefix for supervisory control under partial observation with an application to fault-tolerant control", Ifac Papersonline, Vol.50, No.1, pp. 13642-13647, (2017).
The controllability prefix for supervisory control under partial observation with an application to fault-tolerant control
(Elsevier Science BV, 2017) Moor, Thomas; Schmidt, Klaus Werner
The controllability prefix is known as a useful concept for the discussion and solution of synthesis problems in supervisory control of cp-languages, i.e., formal languages of infinite-length words. There, the controllability prefix is defined as the set of all finite-length prefixes that can be controlled to satisfy prescribed liveness and safety properties. In this paper, we discuss a variation of the controllability prefix to address supervisory control under partial observation for regular *-languages, i.e., formal languages of finite-length words. We derive algebraic properties that are useful for a quantitative analysis on how an upper-bound language-inclusion specification affects achievable lower-bound specifications. Our study is motivated by the synthesis of fault-tolerant supervisory controllers, where the possible occurrence of a fault may restrict the achievable pre-fault behaviour so severe, that a relaxation of the upper-bound specification becomes a practical option. As our study shows, such a relaxation can be systematically constructed in terms of the controllability prefix. (
Citation Count: Erdem, Oguz...et al. (2016). "The effect of powder mixed and heated dielectric on drilling performance of electric discharge machining (EDM)", Journal of the Faculty of Engineering and Architecture of Gazi University, Vol. 31, No. 3, pp. 531-544.
The effect of powder mixed and heated dielectric on drilling performance of electric discharge machining (EDM)
(Gazi Univ, Fac Engineering Architecture, 2016) Erdem, Oğuz; Çoğun, Can; Ürtekin, Levent; Özerkan, H. Bekir; Uslan, İbrahim; 3837
In this study, heated silicon oil with added carbon and starch powders was used as dielectric liquid, instead of common hydro-carbon based dielectrics, to obtain better hole surface quality with rotating brass tube electrode in electric discharge machining (EDM). The electro-rheometer tests were conducted to find out the suitable temperature and powder concentration values of the electro-rheological (ER) dielectric under the electric field. Higher workpiece material removal rates (MRR) was obtained in carbon powder added dielectrics than the starch powder added ones for rotating and non-rotating electrodes. The optical microscope observations of the machined hole surfaces indicated that the carbon powder added dielectrics reduced the diameter and depth of the discharge craters, thereby resulting in uniformly distributed and round top peaked surface topography. The starch powder addition to the carbon mixed dielectric further improved the surface quality for both rotating and non-rotating electrodes cases at 30 degrees C and 75 degrees C dielectric temperatures.

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