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| 1 | Robust Adaptive Gain Higher Order Sliding Mode Observer Based Control-constrained Nonlinear Model Predictive Control for Spacecraft Formation Flying显示文摘This work deals with the development of a decentralized optimal control algorithm, along with a robust observer,for the relative motion control of spacecraft in leader-follower based formation. An adaptive gain higher order sliding mode observer has been proposed to estimate the velocity as well as unmeasured disturbances from the noisy position measurements.A differentiator structure containing the Lipschitz constant and Lebesgue measurable control input, is utilized for obtaining the estimates. Adaptive tuning algorithms are derived based on Lyapunov stability theory, for updating the observer gains,which will give enough flexibility in the choice of initial estimates.Moreover, it may help to cope with unexpected state jerks. The trajectory tracking problem is formulated as a finite horizon optimal control problem, which is solved online. The control constraints are incorporated by using a nonquadratic performance functional. An adaptive update law has been derived for tuning the step size in the optimization algorithm, which may help to improve the convergence speed. Moreover, it is an attractive alternative to the heuristic choice of step size for diverse operating conditions. The disturbance as well as state estimates from the higher order sliding mode observer are utilized by the plant output prediction model, which will improve the overall performance of the controller. The nonlinear dynamics defined in leader fixed Euler-Hill frame has been considered for the present work and the reference trajectories are generated using Hill-Clohessy-Wiltshire equations of unperturbed motion. The simulation results based on rigorous perturbation analysis are presented to confirm the robustness of the proposed approach. | Ranjith Ravindranathan Nair Laxmidhar Behera | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，1： | 8 |
| 2 | Mesoflowers:A New Class of Highly Effi cient Surface-Enhanced Raman Active and Infrared-Absorbing Materials显示文摘A method for the synthesis of a new class of anisotropic mesostructured gold material,which we call“mesoflowers”,is demonstrated.The mesoflowers,unsymmetrical at the single particle level,resemble several natural objects and are made up of a large number of stems with unusual pentagonal symmetry.The mesostructured material has a high degree of structural purity with star-shaped,nano-structured stems.The mesoflowers were obtained in high yield,without any contaminating structures and their size could be tuned from nano-to meso-dimensions.The dependence of various properties of the mesoflowers on their conditions of formation was studied.The near-infrared infrared(NIR IR)absorption exhibited by the mesoflowers has been used for the development of infrared filters.Using a prototypical device,we demonstrated the utility of the gold mesoflowers in reducing the temperature rise in an enclosure exposed to daylight in peak summer.These structures showed a high degree of surface-enhanced Raman scattering(SERS)activity compared to spherical analogues.SERS-based imaging of a single mesoflower is demonstrated.The high SERS activity and NIR IR absorption property open up a number of exciting applications in diverse areas. | Panikkanvalappil Ravindranathan Sajanlal Thalappil Pradeep | 2009 | Nano Research2009，2，4： | 5 |
| 3 | Sol-gel process for the preparation of fine eleetroeeramic powders显示文摘 | Ravindranathan P Komarneni S Choi S C | 1988 | Ferroelectrics1988，87，2： | 1 |
| 4 | Rare earth cuprates as electrocatalysts for methanol oxidation 显示文摘 | Raghuveeer V Ravindranathan Thampi K | 2001 | Solid State Ionics2001，140，： | 1 |
| 5 | Outcomes after bidirectional Glenn operation in single ventricular anatomy: a single centre experience 显示文摘 | Elahi MM Chew HC Ravindranathan H | 2011 | Heart Lung Circ2011，20，： | 1 |
| 6 | Response of intraeranial metastases to erlotinib therapy 显示文摘 | Fekrazad MH Ravindranathan M Jones DV Jr | 2007 | J Clin Oncol2007，25，31： | 1 |
| 7 | Catalytic oxidation of alkanes and alkenes by polymer-anchored amino acid-ruthenium complexes显示文摘 | VALODKAR V B TEMBE G L RAVINDRANATHAN M | 2004 | J of Mol Catal A: Chem2004，223，： | 1 |
| 8 | Catalytic oxidation by polymer-supported copper( Ⅱ )-1-valine complexesc显示文摘 | VALODKAR V B TEMBEB G L RAVINDRANATHAN M | 2004 | Journal of Molecular Catalysis A: Chemical2004，208，1： | 1 |
| 9 | Response of intracranial me- tastases to erlotinib therapy显示文摘 | Fekrazad MH Ravindranathan M Jones DJ | 2007 | J Clin Onco12007，25，31： | 1 |
| 10 | Carbon rtanotubes generated fi-om template carbonization of polyphenyl acetylene as the support for electrooxidadon of methanol显示文摘 | RAJESH B K RAVINDRANATHAN THAMPI | 2003 | Phys Chem2003，107，： | 1 |
| 11 | 显示文摘 | Ravichandran D Roy R Ravindranathan P | 1999 | J Am Ceram Soc1999，82，： | 1 |
| 12 | Studies on high-density nickel zinc ferrite and its magnetic properties using novel hydrazine precursors显示文摘 | SRINlVASAN T T RAVINDRANATHAN P CROSS L E | 1988 | J Appl Phys1988，63，8： | 1 |
| 13 | Pt particles supported on conducting polymeric nanocones as electrocatalysts for methanol oxidation显示文摘 | Rajesh B Ravindranathan T K Bonard J M | 2004 | J Power Sources2004，133，2： | 1 |
| 14 | Intravesical chitosan/interleukin-12 immunotherapy induces tumor-specific systemic immunity against murine bladder cancer显示文摘 | Smith SG Koppolu BP Ravindranathan S | 2015 | Cancer Immunol Immunother2015，64，6： | 1 |
| 15 | Control of infestation on dry fish by pyrethrum treatment on commercial containers显示文摘 | Unnikrishnan Nair T S Mathen C Ravindranathan Nair P | 1994 | Fishery Technology1994，31，： | 1 |
| 16 | Glial cell line-derived neurotrophic factor mediates the desirable actions of the anti-addiction drug ibogaine against alcohol consumption显示文摘 | HE DAOYAO MCGOUGH N N RAVINDRANATHAN A | 2005 | J Neurosci2005，25，3： | 1 |
| 17 | Glial cell line-derived neurotrophic factor mediates the desirable actions of the anti-addiction drug ibogaine against alcohol consumption显示文摘 | He DY McGough NN Ravindranathan A | 2005 | J Neurosci2005，25，3： | 1 |
| 18 | Conversion of syn-gas to lower alkenes over Fe-TiO2-ZnO-K20 catalyst system 显示文摘 | ROY S Ch PRASAD H L DUTTA P BHATTACHARYA A SINGH B KUMAR S MAHARAJ S KAUSHIK V K MUTHUKUMARU PILLAI S RAVINDRANATHAN M | 2001 | Appl Catal A2001，220，12： | 1 |
| 19 | Ethanol-responsive brain region expression networks: implications for behavioral responses to acute ethanol in dba/2j versus c57bl/6j mice 显示文摘 | Kems RT Ravindranathan A Hassan S | 2005 | J Neurosci2005，25，： | 1 |
| 20 | Synthesis and catalytic activity of Fe(Ⅲ) anchored to a polystyrene- schiff base support显示文摘 | R Antony G L Tembe M Ravindranathan | 2001 | J Mole Catal A Chem2001，171，： | 1 |
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