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V.T. Nagaraj

Bio: V.T. Nagaraj is an academic researcher from Hindustan Aeronautics Limited. The author has contributed to research in topics: Deflection (engineering) & Fundamental frequency. The author has an hindex of 3, co-authored 4 publications receiving 24 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the torsional vibrations of non-uniform pretwisted rotating blades are studied by using finite element methods based on both the Rayleigh-Ritz and Galerkin formulations.

9 citations

Journal ArticleDOI
TL;DR: In this article, the non-linear equations of motion of a rotating blade undergoing extensional and flapwise bending vibration are derived, including nonlinearities up to O (e3), and the strain-displacement relationship derived is compared with expressions derived by earlier investigators and the errors and the approximations made in some of those are brought out.

8 citations

Journal ArticleDOI
TL;DR: In this article, the Galerkin finite element method is used to obtain the flutter characteristics of two-dimensional panels, with use also made of an improved beam element with an internal node.

5 citations

Journal ArticleDOI
TL;DR: The non dimensional constant in Bert's formula relating the fundamental frequency to the maximum static deflection under gravity has been shown to be applicable to both rotating and non rotating Timoshenko beams.

2 citations


Cited by
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Book
01 Sep 2007
TL;DR: In this paper, a variety of structural components are analyzed with a view to predicting their response to various (primarily axial) loading conditions, and the authors present methods by which the combined effects of vibration and buckling on various structures can be assessed.
Abstract: This 2007 book concerns the vibration and the stability of slender structural components. The loss of stability of structures is an important aspect of structural mechanics and is presented here in terms of dynamic behavior. A variety of structural components are analyzed with a view to predicting their response to various (primarily axial) loading conditions. A number of different techniques are presented, with experimental verification from the laboratory. Practical applications are widespread, ranging from cables to space structures. The book presents methods by which the combined effects of vibration and buckling on various structures can be assessed. Vibrations and buckling are usually treated separately, but in this book their influence on each other is examined together, with examples when a combined approach is necessary. The avoidance of instability is the primary goal of this material.

206 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that Hartmann-Sprenger tube with a logarithmic spiral profile achieves a significantly higher base temperature than a 10deg tapered tube or a rectangular tube of comparable length.
Abstract: Nevertheless, the present results are useful from a comparative rather than absolute standpoint. Tests were also conducted to determine those locations of the tube mouth relative to the nozzle that produced maximum end-wall temperatures. Results for the logarithmic spiral profile at the jet pressure ratio of 3.77 show that the maximum temperature varies periodically with the nozzletube separation h due to the periodic structure of the exciting jet. The highest temperatures were recorded at h/d= 1.7. This means that the peak corresponds to a location where the tube mouth is situated downstream of the first pressure cell. This result differs from the findings of Przirembel and Fletcher.8 However this difference might be explained by the fact that in their case, the open-end walls were rounded in contrast to the 30-deg chamfered entrances of the present tests. Conclusion Thermocouple measurements have demonstrated that a Hartmann-Sprenger tube with a logarithmic spiral profile achieves a significantly greater base temperature than a 10deg tapered tube or a rectangular tube of comparable length. This improved performance is interpreted to result from a higher degree of shock amplification which produces a greater entropy rise in the shock-heated indigenous gas that remains trapped inside the tube. Therefore, it appears that an axisymmetric logarithmic spiral tube could be used to improve the performance further.

70 citations

Journal ArticleDOI
TL;DR: In this paper, the dynamic analysis of two different structures in one of which there are 10 groups of 6 blades and in the other 5 groups of 12 blades, is performed to investigate behavior deviation.

46 citations

Journal ArticleDOI
TL;DR: In this paper, the axial-torsional vibrations of rotating pretwisted thin-walled composite box beams exhibiting primary and secondary warping are investigated and coupled nonlinear axial torsional equations of motion are derived using Hamilton's principle.

40 citations