Yazar "Das, M. Taylan" seçeneğine göre listele

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    Experimental modal analysis of curved composite beam with transverse open crack
    (Academic Press Ltd- Elsevier Science Ltd, 2018) Das, M. Taylan; Yilmaz, Ayse
    Curved composite beams are the most widely preferred structures due to their high strength, low weight, corrosion and heat resistance. The aim of this study is to examine the modalities and natural frequencies of curved cracked composite (CCC) beams under different boundary conditions. Numerical and experimental free vibration analyses of curved composite beams with transverse cracks of various depths and locations are presented. Fixed-Fixed and Fixed-Free (cantilever) boundary conditions are used for both numerical and experimental studies. It is observed that the natural frequency values of the modes decrease as the crack depth increase depend on the crack position in the material. (C) 2018 Elsevier Ltd. All rights reserved.
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    Mathematical Modeling and Simulation of Full Flight Helicopter Simulator
    (2019) Das, M. Taylan; Kumpas, İsmail
    In Aviation, Flight simulators are highly technological devices which are especially used to create the highly-accurate and zerorisk training environment for orientation, emergency, refresher, combat readiness & maintenance / testing pilot training. FullFlight Simulators are the simulators including a cockpit exactly like the real cockpit, visual system which is very close adaptingthe outside world images, a main simulation software which simulates the aerodynamic flight performance and the disruptiveeffects of helicopter. In this study, mathematical modelling of AS-532 Cougar helicopter is performed by using Newton-Eulerequation. Matlab-Simulink is used for demonstration of simulation results. Comparison of real simulator values and simulationresults are enclosed.
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    Structural Health Monitoring via Phase Space Warping and Time-Delay Embedding
    (Asce-Amer Soc Civil Engineers, 2023) Saritas, Resul; Das, M. Taylan; Rasheed, Omar; AlHamaydeh, Mohammad; Yavuz, Mustafa; Abdel-Rahman, Eihab
    The state of a structure's health can be determined by investigating its vibration characteristics. Vibration-based structural health monitoring (SHM) enables early detection and diagnosis of damage as well as extension of service life. Herein, linear and nonlinear tracking metrics are proposed to track deterioration in the condition of multistory structures and assess their instantaneous health in real-time via measurement of floor accelerations. The linear metrics, the amplitude damage index ADIn(t over bar ) and the frequency damage index FDIn(t over bar ), are based on tracking the power spectra of floor accelerations. The nonlinear metric e(t over bar ) is based on a novel implementation of the phase-space warping method and obtained from the orbits representing the floors' motions in pseudo phase-space. A scaled-down model of a four-floor moment-resisting frame building is designed and fabricated to demonstrate and to compare the capabilities of the three damage indices. Structural damage is introduced to individual columns, to mimic damage initiation, by cutting two notches on opposite sides of a column cross-section at midheight. The ADIn(t over bar ) detected large damage events, fast deterioration beyond them, and the onset of failure using any of the four floor accelerations. The FDIn(t over bar ) proved insensitive to damage compared with the other two metrics. The nonlinear metric e(t over bar ) detected gradual (fatigue-induced) deterioration in the building's health before introduction of damage, large damage events, fast deterioration beyond them, and the onset of failure, using any of the four floor accelerations. The e(t over bar ) metric varied slowly and continuously with gradual deterioration and exhibited larger discontinuous jumps with discrete damage events. This was true for all three damage experiments undertaken on the model building. The nonlinear e(t over bar ) metric was also found to be more efficient, in terms of signal utilization, in comparison with the linear ADIn(t over bar ) metric. 1415.(c) 2022 American Society of Civil Engineers.