Vaidyanathan S.,Tamil University |
Rajagopal K.,Singhania University
International Journal of Systems Signal Control and Engineering Application | Year: 2011
This study investigates the hybrid synchronization of identical hyperchaotic Wang-Chen systems, identical hyperchaotic Lorenz systems and non-identical hyperchaotic Wang-Chen and Lorenz systems. The hyperchaotic Wang-Chen system and hyperchaotic Lorenz system are important models of hyperchaotic systems. Hybrid synchronization of the hyperchaotic systems addressed in this study is achieved through the synchronization of the 1st and 3rd states of the master and slave systems and anti-synchronization of the 2nd and 4th states of the master and slave systems. Active nonlinear control is the method used for the hybrid synchronization of hyperchaotic Wang-Chen and Lorenz systems and the stability results are established using Lyapunov stability theory. Since, the Lyapunov exponents are not required for these calculations, the proposed method is quite effective and convenient to achieve hybrid synchronization of the hyperchaotic systems addressed in this study. Numerical simulations are provided to illustrate the effectiveness of the various synchronization schemes proposed in this study.
Kalia S.,BAHRA University |
Sheoran R.,Singhania University
International Journal of Polymer Analysis and Characterization | Year: 2011
It becomes necessary to change the surface morphology of natural fibers to improve the interfacial adhesion between matrix and fibers. To improve the compatibility between natural fibers and hydrophobic polymer matrices, various greener methods have been explored such as plasma treatment and treatments using fungi, enzymes, and bacteria. In the present article, we report the microwave-assisted grafting of methyl methacrylate onto ramie fibers (Boehmeria nivea) and cellulase enzyme-assisted biopolishing of ramie fibers using the bacteria Streptomyces albaduncus. The effects of these treatments on the properties of ramie fibers are discussed. The modified fibers were characterized by using FT-IR, SEM, XRD, and TGA/DTA techniques in order to determine their morphology, crystallinity, and thermal stability. This article also describes the comparative study of properties of biologically and chemically modified ramie fibers. © Taylor & Francis Group, LLC.
Sayyad F.B.,Singhania University
JVC/Journal of Vibration and Control | Year: 2012
In this paper, theoretical and experimental analysis of a vibrating, simply supported beam with a crack is carried out. This method is used to address the inverse problem of assessing the crack location and crack size in various beam structures. The method is based on measurement of natural frequencies, which are of global parameter and can be easily measured from any point on the structure. In theoretical analysis the crack is simulated by an equivalent spring, connecting the two segments of the beam. Analysis of this approximate model results in algebraic equations, which relate the natural frequencies of the beam, and crack location. Also the relationship between the natural frequencies, crack location and crack size has also been developed. For identification of the crack location and crack size, it was shown that data on the variation of the first two natural frequencies is sufficient. The computation of natural frequencies of an uncracked and cracked beam is facilitated by a finite element method package. This database is to be utilized in an analytical method to address the inverse problem to identify the crack location and crack size. Experiments have also been performed on a simply supported beam. The experimental analysis is done to verify the practical applicability of the theoretical method developed. A good agreement between the predicted and actual crack location and crack size is obtained. The results obtained by theoretical and experimental methods are compared graphically. © 2011 The Author(s).
Sundarapandian V.,Vel Tech Dr.RR & Dr.SR Technical University |
Karthikeyan R.,Singhania University
Journal of Engineering and Applied Sciences | Year: 2012
In this study, researchers apply adaptive control method to derive new results for the anti-synchronization of identical Tigan Systems (2008), identical Li Systems (2009) and non-identical Tigan and Li Systems. In adaptive anti-synchronization of identical chaotic systems, the parameters of the master and slave systems are unknown and researchers devise feedback control law using the estimates of the system parameters. In adaptive anti-synchronization of non-identical chaotic systems, the parameters of the master system are known but the parameters of the slave system are unknown and researchers devise feedback control law using the estimates of the parameters of the slave system. The adaptive synchronization results derived in this study for the uncertain Tigan and Li Systems are established using Lyapunov Stability Theory. Since, the Lyapunov exponents are not required for these calculations, the adaptive control method is very effective and convenient to achieve anti-synchronization of identical and non-identical Tigan and Li Systems. Numerical simulations are shown to demonstrate the effectiveness of the adaptive anti-synchronization schemes for the uncertain chaotic systems addressed in this study. © Medwell Journals, 2012.
Vaidyanathan S.,Vel Tech Dr.RR & Dr.SR Technical University |
Rajagopal K.,Singhania University
Communications in Computer and Information Science | Year: 2011
This paper investigates the global chaos synchronization of identical hyperchaotic Pang systems (Pang and Liu, 2011) and synchronization of non-identical hyperchaotic Pang system and Wang system (Wang and Liu, 2006). Active nonlinear feedback control is the method used to achieve the synchronization of the identical and different hyperchaotic Pang and Wang systems addressed in this paper and our results are established using Lyapunov stability theory. Since the Lyapunov exponents are not required for these calculations, the active control method is effective and convenient to synchronize identical and different hyperchaotic Pang and Wang systems. Numerical simulations are given to illustrate the effectiveness of the proposed synchronization schemes for the global chaos synchronization of hyperchaotic systems addressed in this paper. © 2011 Springer-Verlag Berlin Heidelberg.