ETD at Indian Institute of Science
Repository of Theses and Dissertations of Indian Institute of Science, Bangalore, India. The repository has been developed to capture, disseminate and preserve research theses of Indian Institute of Science.
Aerospace Engineering (aero)
Mostrando recursos 1 - 20 de 159
Novel Finite Element Formulations For Dynamics Of Acoustic Fluids - Kishor, Dubasi Krishna
Fluid-structure interaction (FSI) as the name suggests, is the study of dynamic interaction of both fluid and structure motions. Fluid-structure interaction exists in almost all engineering and science fields. Moreover, the random loading caused by fluid motions in uncertain environment conditions present new challenges to the designers. The objective of the present research work is to develop efficient and robust finite element models to solve fluid structure interaction problems effectively. A key advantage of the displacement based FE M is the flexibility and easiness in modifying the existing efficient numerical solvers, and can also be extended easily to a number...
System Identification And Control Of Helicopter Using Neural Networks - Vijaya Kumar, M
The present work focuses on the two areas of investigation: system identification of helicopter and design of controller for the helicopter.
Helicopter system identification, the first subject of investigation in this thesis, can be described as the extraction of system characteristics/dynamics from measured flight test data. Wind tunnel experimental data suffers from scale effects and model deficiencies. The increasing need for accurate models for the design of high bandwidth control system for helicopters has initiated a renewed interest in and a more active use of system identification. Besides, system identification is likely to become mandatory in the future for model validation...
Thermal Behaviour Of Mono-Fibre Composites And Hybrid Composites At Cryogenic Temperatures - Praveen, R S
Hybrid composites forms an important field of research in the area of composite science and engineering as it gives the advantage of avoiding complex lay-up designs and provides better tuning compatibility to get desired properties in comparison with their mono-fiber counterpart.
Further, utilization of composites for low temperature structures has been hindered by inconsistency of material property data and not much is reported on thermal characteristics of hybrid composites at cryogenic temperatures.
This research work is focused on development of carbon-glass epoxy hybrid composite and to study the thermal behavior of these materials in comparison to its mono-fiber counterparts especially...
Closed-form Solutions For Rotating And Non-rotating Beams : An Inverse Problem Approach - Sarkar, Korak
Rotating Euler-Bernoulli beams and non-homogeneous Timoshenko beams are widely used to model important engineering structures. Hence the vibration analyses of these beams are an important problem from a structural dynamics point of view. The governing differential equations of both these type of beams do not yield any simple closed form solutions, hence we look for the inverse problem approach in determining the beam property variations given certain solutions.
Firstly, we look for a rotating beam, with pinned-free boundary conditions, whose eigenpair (frequency and mode-shape) is same as that of a uniform non-rotating beam for a particular mode. It is seen...