Institution
National Aerospace Laboratories
Facility•Bengaluru, India•
About: National Aerospace Laboratories is a facility organization based out in Bengaluru, India. It is known for research contribution in the topics: Coating & Corrosion. The organization has 1838 authors who have published 2349 publications receiving 36888 citations.
Topics: Coating, Corrosion, Mach number, Sputter deposition, Aerodynamics
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this article, a new spectrally selective TiAlN/CrAlON/Si3N4 tandem absorber was deposited on copper substrates using a reactive direct current magnetron sputtering system.
87 citations
••
08 Aug 2011TL;DR: In this article, an alternative approach has emerged for a certain class of problems where the error in the states is estimated using a Kalman filter, rather than the state itself, by deriving the error state dynamics, via the perturbation of the nonlinear plant.
Abstract: The Kalman filter (KF) is the optimal estimator that minimizes the mean square error when the state and measurement dynamics are linear in nature, provided the process and measurement noise processes are modeled as white Gaussian. However, in the real world, one encounters a large number of scenarios where either the process or measurement model (or both) are nonlinear. In such cases a class of suboptimal Kalman filter implementations called extended Kalman filters (EKF) are used. EKFs operate by linearizing the nonlinear model around the current reference trajectory and then designing the Kalman filter gain for the linearized model. Recently, an alternative approach has emerged for a certain class of problems where the error in the states is estimated using a Kalman filter, rather than the state itself. This error state KF (ErKF) approach, by deriving the error state dynamics, via the perturbation of the nonlinear plant, lends itself to optimal updates in the error states and optimal prediction and updates in the error state covariance. This is because the error state dynamics are linear, thereby satisfying a condition for optimal Kalman filtering. This paper offers a comparison between the EKF and ErKF via simulations and shows that the ErKF performance is robust to a variety of aircraft maneuvers performed. Furthermore, this paper shows that the ErKF, unlike the EKF, need not be repeatedly tuned with respect to the noise covariances in order to obtain acceptable estimation performance.
84 citations
••
TL;DR: In this paper, a superhydrophobic surface was obtained by embedding hydrophobically modified fumed silica (HMFS) particles in polyvinylidene fluoride (PVDF) matrix.
84 citations
••
TL;DR: In this article, a number of factors influence the fatigue life of a component in service, viz., complex stress cycles, engineering design, manufacturing and inspection, service conditions and environment and material of construction, and premature fatigue crack initiation in the components can be attributed to defects of various types introduced mostly inadvertently in various stages of component design, manufacture, maintenance, inspection, operation etc.
84 citations
••
TL;DR: In this article, the corrosion behavior of NbN and TiN/NbN multilayer hard coatings was investigated using X-ray diffraction, nanoindentation, atomic force microscopy, scanning electron microscopy (SEM) and energy-dispersive Xray analysis.
83 citations
Authors
Showing all 1850 results
Name | H-index | Papers | Citations |
---|---|---|---|
Harish C. Barshilia | 46 | 236 | 6825 |
K.S. Rajam | 42 | 83 | 4765 |
Kozo Fujii | 39 | 411 | 5845 |
Parthasarathi Bera | 39 | 136 | 5329 |
R.P.S. Chakradhar | 36 | 166 | 4423 |
T. N. Guru Row | 36 | 309 | 5186 |
Takashi Ishikawa | 36 | 154 | 5019 |
Henk A. P. Blom | 34 | 168 | 5992 |
S. Ranganathan | 33 | 211 | 5660 |
S.T. Aruna | 33 | 101 | 4954 |
Arun M. Umarji | 33 | 207 | 3582 |
Vinod K. Gaur | 33 | 92 | 4003 |
Keisuke Asai | 31 | 350 | 3914 |
K. J. Vinoy | 30 | 240 | 3423 |
Gangan Prathap | 30 | 241 | 3466 |