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TVS Motor Company Limited, which is part of TVS Group, manufactures motorcycles, scooters, mopeds and auto rickshaws in India. Wikipedia.

Hazra S.,TVS Motor Company | Sensarma P.,Indian Institute of Technology Kanpur
IET Renewable Power Generation | Year: 2011

This study presents a detailed investigation on self-excitation of a squirrel-cage induction generator (SCIG) used in a wind energy conversion system. Air-gap flux of the SCIG is gradually built up through controlled current injection from a voltage source converter (VSC), connected directly across its stator terminals. Dc voltage of the VSC is ramped from a small initial value, which is the rectified output of the small terminal voltage developed because of remanent magnetism. Increase in air-gap flux increases generator terminal voltage and output power which further increases the dc bus voltage. The field-oriented control method is appropriately applied both for control of voltage build-up as well as dynamic transients. The critical factors deciding this collaborative excitation are analysed and sufficient conditions are derived analytically. System modelling and analytical results are validated through numerical simulation and verified on a 2.2kW laboratory prototype. © 2011 The Institution of Engineering and Technology. Source

Krishna A.S.,Indian Institute of Technology Madras | Mallikarjuna J.M.,Indian Institute of Technology Madras | Kumar D.,TVS Motor Company
Applied Energy | Year: 2016

This paper deals with the in-cylinder flow field analysis in a two-stroke engine under motoring conditions by particle image velocimetry (PIV) and computational fluid dynamics (CFD). The main objective is to analyze the effect of engine parameters viz., engine speed, compression ratio (CR) and port orientation on the in-cylinder flows in a loop-scavenged two-stroke gasoline direct injection (GDI) engine, with an aim to help researchers to design fuel efficient and less polluting two-stroke engines. In this study, a single-cylinder 70 cm3 two-stroke engine which is very commonly used for the two-wheeler application, is considered. The engine cylinder is modified to provide optical access into the in-cylinder region. The PIV experiments are conducted at various engine speeds viz., 500, 1000 and 1500 rev/min, and the plane averaged velocity vector fields obtained, are analyzed to understand the in-cylinder flow behavior. The CFD study is also carried out using the commercial CFD code, STARCD, to study and compare the in-cylinder flow parameters at various engine operating conditions. The CFD results are compared with the experimental results to the extent possible. The CFD predictions are found to be in good agreement with the experimental results. Therefore, the CFD analysis has been extended further to understand the effect of various engine parameters on the in-cylinder flows. We found that the turbulent kinetic energy and tumble ratio increased by about 25% and 20% respectively, when the engine speed was increased from 1000 to 1500 rev/min. Also, we found that the turbulent kinetic energy and tumble ratio decreased by about 13% and 26% when the compression ratio was increased from 7 to 8. In addition, we found that the port orientation, rather than port areas had a greater influence on the in-cylinder flow parameters. © 2016 Elsevier Ltd. Source

Roy H.K.,University of Warwick | Roy H.K.,TVS Motor Company | McGordon A.,University of Warwick | Jennings P.A.,University of Warwick
IEEE Transactions on Vehicular Technology | Year: 2014

Hybrid electric vehicles (HEVs) are considered to be one of the energy-efficient technologies for near-term sustainability of the transportation sector. Over the years, research has focused on improving fuel economy (FE) for a given drive cycle, but FE variability over a realistic range of real-world driving patterns has been generally overlooked, and this can lead to FE benefits not being fully realized in real-world usage. No systematic methodology exists to reduce FE variability by design optimization of powertrain components. This study proposes a methodology of powertrain component optimization to reduce the FE variability due to variations in driving patterns. In the proposed methodology, powertrain components are optimum over a range of driving patterns of different traffic conditions and driving styles simultaneously. The proposed methodology demonstrates the potential to reduce FE variability by up to 34% over six driving patterns of different traffic conditions and driving styles. © 2013 IEEE. Source

Kumar S.,Indian Institute of Technology Roorkee | Durga Shankar Gupta,TVS Motor Company | Singh I.,Indian Institute of Technology Roorkee | Sharma A.,Indian Institute of Technology Roorkee
Journal of Reinforced Plastics and Composites | Year: 2010

This study investigates the ballistic response of laminated composite plates using numerical simulations. Numerical simulations were carried out to determine the ballistic response of thick Kevlar/epoxy composite plates, commonly used in body armor. These plates were impacted at velocities between 100 and 1000 m/s. The numerical parametric study of ballistic impact caused by cylindrical projectile is undertaken to obtain an estimate for the ballistic limit velocity, energy absorbed by the plate, and the contact duration. The effect of mass and diameter of the projectile on ballistic limit velocity was also studied. The results obtained hereby are in good agreement with the experimental data presented by other researchers. © 2010 The Author(s). Source

Hazra S.,TVS Motor Company | Sensarma P.S.,Indian Institute of Technology Kanpur
IET Renewable Power Generation | Year: 2010

This study presents a rugged and cost-effective scheme for start-up and operation of a stand-alone squirrel cage induction machine (SCIG) for a wind energy conversion system (WECS). A voltage source converter (VSC) directly interfaces the SCIG with an equivalent dc load network, which could also be the DC link of an inverter. The VSC dc bus is supported by an electrolytic capacitor and the proposed scheme ensures reliable start up with these rudimentary components. The dc bus voltage is ramped to the rated value from a small initial voltage produced by remanent magnetism of the SCIG core. Subsequently, the load is applied. The V/f control paradigm for motoring operation is suitably extended to the SCIG for controlling both voltage build-up and dynamic transients. A controller is specifically designed to maintain constant dc bus voltage under wind speed and electrical load variations. Steady-state machine flux is maintained constant up to the base speed, which maximises machine utilisation and power extraction especially at higher wind speeds. The overall system modelling and analytical control design is presented. The proposed control strategy has been validated through simulation and experimentally verified on a low power (2.2 kW) laboratory prototype. © 2010 © The Institution of Engineering and Technology. Source

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