Faculty Publications
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Publications by NITK Faculty
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Item Helicopter Main Rotor Blade Root End under High Velocity Bird Impact(Elsevier Ltd, 2018) Chandra Naik, D.; Vijaya Kumar, R.A numerical simulation methodology has been successfully developed to model the bird strike on the innovative helicopter main rotor blade root end under high velocity bird impact. This paper demonstrates the state-of-the-art composite modelling methodology of main rotor blade and numerical bird models through experimental tests and simulation tools. The present work is based on the application of non-linear explicit finite element analysis to simulate the response of main rotor blade root end. The damage behavior under soft body impact depends upon bird size, blade size, blade span wise location of impact and bird orientation with respect to hitting location, blade rotational speed and rotorcraft cruise speed. Bird model is considered as hydrodynamic with length to diameter ratio of 2. A bird strike event is characterized by loads of high intensity and short duration. A transient explicit non-linear finite element based impact analysis using Autodyn has been carried out to predict bird strike resistance to withstand 1.0 kg bird at critical flight condition. The numerical simulation results are compared to experimental bird strike test data, leading to conclusions about the success of both the design concept and the simulation methodology. The comparison shows a very good agreement between experimental and simulated damage evolution during impact. © 2017 Elsevier Ltd.Item Flood inundation mapping of harangi river basin, kodagu, using gis techniques and hec-ras model(Springer Science and Business Media Deutschland GmbH, 2021) Dev Anand, M.R.; Kundapura, S.Flood is the most common hydrologic event frequently experienced in India. The states of Kerala, UP, West Bengal, Karnataka and Assam were the mainly affected by flood in 2018. In Kodagu, the southern district of Karnataka, many people have been affected by heavy rains. Landslides in hilly terrain and flooding have worsened the lives of people and led to the destruction of 800 homes, 240 bridges collapsed, road networks of 2225 km damaged and 65 government buildings affected. The cost of rebuilding road infrastructure and buildings is approximately Rs. 3000 crores. While developing flood mitigation measures, flood inundation maps are an essential component, which will be useful for the planning stage. The mapping is expected to estimate the prone flood zone based on river flood stage without performing additional simulations and quantification of the flood risk with respect to different vulnerability parameters giving a clear picture of the planning stage. These are going to be achieved by both 1D hydrodynamic models and GIS environment. This study gives an insight about how unscientific development activities may increase the negative impacts of natural disasters. It can support the planners to correctly identify the non-vulnerable places while rebuilding the damaged infrastructure. This can help people to resettle permanently in a safer place, so that they will not be affected in the case of future disasters. Depending on the severity of the water levels, we can identify the area for construction of hydraulic structures for flood protection. © Springer Nature Singapore Pte Ltd 2021.