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Rao K.D.,Centurion University | Kumar S.,Jadavpur University
Advances in Intelligent Systems and Computing | Year: 2014

In this paper design of the Linear Quadratic Regulator (LQR) for Quarter car semi active suspension system has been done. Current automobile suspension systems use passive components only by utilizing spring and damping coefficient with fixed rates. The vehicle suspension systems are typically rated by its ability to provide good road handling and improve passenger comfort. In order to improve comfort and ride quality of a vehicle, four parameters are needed to be acknowledged. Those four parameters are sprung mass acceleration, sprung mass displacement, unsprung displacement and suspension deflection. This paper uses a new approach in designing the suspension system which is semi-active suspension. Here, the hydraulic damper is replaced by a magneto-rheological damper and a controller is developed for controlling the damping force of the suspension system. The semi-active suspension with controller reduces the sprung mass acceleration and displacement hence improving the passengers comfort. © Springer International Publishing Switzerland 2015. Source


Shoba C.,Gandhi Institute of Technology and Management | Ramanaiah N.,Andhra University | Rao D.N.,Centurion University
Journal of Materials Research and Technology | Year: 2015

The present study aims at finding the residual stresses on aluminum hybrid composites during turning operation. The composites with varying percentage by weight reinforcement of 2, 4, 6 and 8 RHA and SiC in equal proportions were fabricated using two stage stir casting process. X-ray diffraction was used to study the residual stresses on the surface layer of the machined surface. It was observed that the residual stresses generated during casting were considerably larger when compared to the stresses generated during machining of composites. It was also noticed that the residual stresses were found to decrease with the increase in the reinforcement and increases with the increase in cutting speed. The related mechanisms are explained and presented in this work. © 2015 Brazilian Metallurgical, Materials and Mining Association. Source


Sahoo P.K.,Centurion University | Parvathi K.,KIIT University
2014 International Conference on High Performance Computing and Applications, ICHPCA 2014 | Year: 2015

Efficiency of any surveillance system depends on the efficacy of moving object detection. Background subtraction, temporal differencing and optical flow techniques are mostly used in the moving object detection techniques. In this paper a hybrid technique is proposed based on background subtraction and temporal differencing techniques to detect the moving objects in outdoor and indoor scenes. The efficacy of algorithm is validated using different test videos and comparing with background subtraction and temporal differencing methods. © 2014 IEEE. Source


Govinda Rao P.,GMRIT | Srinivasa Rao P.,Centurion University | Gopala Krishna A.,Jawaharlal Nehru Technological University Kakinada
Journal of Manufacturing Technology Research | Year: 2015

In this review paper the residual stresses in welded structures produced by vibratory welding process has been discussed. Material properties, material manufacture, and structural geometry, welding process, treatments after welding and service conditions have been considered to analyse residual stress distributions. Plate butt welds, circumferential butt welds and weld cladding are the best examples to analyse residual stress distributions. Entire manufacturing and service history of the vibratory welded structure and its component materials are required for better understanding and analyzing the improvement in prediction and reduction of residual stresses. Microstructure of can be refined when the welded joints prepared with the presence of vibration. In this study, mechanical vibrations were given to the weld specimens during welding for identifying its effect on the hardness, metallurgical structure and residual stress of the material. Residual stresses were found to diminish in response to vibration whether it was applied during welding or after welding. Also grain growth process in the weld was increased. © Nova Science Publishers, Inc. Source


Govinda Rao P.,GMRIT | Srinivasa Rao P.,Centurion University | Gopala Krishna A.,Jawaharlal Nehru Technological University Kakinada
Journal of Manufacturing Technology Research | Year: 2014

Vibration techniques have been used in welding for improving the mechanical properties of metals in the last few decades. In the present work vibratory setup has been used for inducing mechanical vibrations into the weld pool during welding. The designed vibratory setup produces the required frequency with the amplitude and acceleration in terms of voltages. An increase in the impact strength of the weld pieces in to the heat affected zone (HAZ) has been observed. The increase in mechanical properties is attributed to, as the weld pool solidifies, grains are not only limited in size but also dendrites are broken before they grow large in size. Refined microstructure has been observed. The above mechanism is responsible for the improvement in impact strength of weld pieces welded with vibratory setup compared to without vibration during welding. © Nova Science Publishers, Inc. Source

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