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DAE, India

Balamonica K.,CSIR - Central Electrochemical Research Institute | Ramamohan Rao A.,CSIR - Central Electrochemical Research Institute | Nimala Sundaran M.,IGCAR | Chellapandi P.,IGCAR | Gopalakrishnan N.,CSIR - Central Electrochemical Research Institute
Nuclear Engineering and Design

The control and safety rod drive mechanism is a classic example of a multiply supported and differentially excited structure as it receives varying inputs at each of its supports as they are connected at different parts of a building. The responses of such systems are conventionally computed using pseudo-static method in which the dynamic component is evaluated by time history analysis, response spectrum method or modal analysis. In the present work the dynamic components are evaluated by using Ritz vectors and are compared with the conventional methods namely time history analysis and modal analysis. The usage of Ritz vectors as an alternative for conventional modal vectors has been validated through an experiment conducted on a control and safety rod drive mechanism (CSRDM) subjected to differential input motion. The validation of the code developed for this purpose is carried out for a bridge structure. ©2014 Elsevier B.V. All rights reserved. Source

Santhanam M.,Indian Institute of Technology Madras | Venkatachalapathy V.,IGCAR | Sivathanupillai C.,IGCAR | Gettu R.,Indian Institute of Technology Madras
Journal of the Institution of Engineers (India): Civil Engineering Division

This paper deals with the characterization of typical high density concrete used in fast reactors for structural and shielding purposes. The concretes were studied using haematite or steel aggregates, and their densities varied from 36-46kNlm 3. Several properties of concretes with design strengths of 30MPa and 60 MPa were also studied that include the compressive, splitting-tensile and bond strengths, the constitutive relationship in compression (ie, stress-strain curve) and the failure strain, the Young's modulus and Poisson's ratio, the thermal expansion coefficient, the creep behaviour, and the drying shrinkage response. The high density concretes were also compared with normal weight concretes of the same strength grade with respect to the above parameters. Source

Venkata Reddy P.,Indian Institute of Science | Narasimham G.S.V.L.,Indian Institute of Science | Raghurama Rao S.V.,Indian Institute of Science | Johny T.,IGCAR | Kasiviswanathan K.V.,IGCAR
International Communications in Heat and Mass Transfer

Non-Boussinésq conjugate natural convection in a vertical annulus with a centrally located vertical heat generating rod is studied numerically, taking into account variable transport properties. Results are presented for maximum solid temperatures, average Nusselt numbers and average pressure. In general, the Boussinésq model predicts higher temperatures in the solid and lower average Nusselt numbers on the inner and outer boundaries. © 2010 Elsevier Ltd. Source

Vasumalaikannan A.,IGCAR | George S.J.,IGCAR | Venugopal S.,IGCAR | Kumar R.,CUSAT
Proceedings of the IASTED International Conference on Robotics, Robo 2010

This paper details the development of bilateral master slave control using low cost microcontroller. The proposed system is cost effective. Force feedback is widely assumed to enhance the performance in Telemanipulation. In this paper the environment force is estimated just by sensing the slave's current and the results shows an acceptable performance of the developed system. The performance of the system is given in the last section of this paper. Source

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