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Gupta, P.
- Delhi Volcanics in Parts of Central Rajasthan and their Significance
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Authors
Affiliations
1 Geological Survey of India, IN
1 Geological Survey of India, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 31, No 3 (1988), Pagination: 314-327Abstract
The Proterozoic Delhi Supergroup of rocks along the Aravalli orographic axis in central Rajasthan encloses thick linear piles of syn-sedimentary volcanics. The volcanies are low-potassic oceanic tholeiites derived from mantle source. The repository basin was ensialic to start with and was partially rifted to facilitate magma upwelling concomitant with sedimentation. Structural stratigraphic and chemical characters of the volcanics militate against the possibility of its being allochthonous slices of an oceanic crust.
- Tectono-Stratigraphic Framework and Volcanic Geology of the South Delhi Fold Belt in Central Rajasthan
Abstract Views :210 |
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Authors
Affiliations
1 Geological Survey of India, Jaipur 302004, IN
1 Geological Survey of India, Jaipur 302004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 5 (1991), Pagination: 431-441Abstract
The Delhi rocks are deposited in two sub-basins separated by a median inlier of Pre·Delhi rocks. The Barotiya and Sendra Fonnations occupying the western sub-basin contain significant basic flows and tuffs with associated felsic volcanics. The eastern sub-basin recording a diachronous evolutionary history is the repository of the Rajgarh and Bhim sediments.
Striking similarities are noted in respect of lithology, structure and metamorphism amongst the gneisses and schists of the Pre-Delhi rocks flanking the Delhi Supergroup and also of the median inlier. Structural imprints and contact relationship indicate that these gneisses and schists fonn the basement for the Delhi sediments. Migmatization related to orogeny suggests reactivation of a sialic basement, which along with the tectonic emplacement of basement slices in the Delhi stratigraphy argue in favour of an intra-cratonic development of the Delhi basin.
The western sub-basin shows bimodal volcanism and the various geochemical discriminants suggest an IATor MORB setting, but fail to make a choice between the two. Bimodal volcanism in association with shallow clastic sediments signify ensialic origin in a rifted mobile belt. Structural studies indicate large-scale dextral vergence with steep 'S' surfaces which are characteristic of oblique shear transpressive mobile belt.
Keywords
Delhi Fold Belt, Tectona-Stratigraphy, Rajasthan, Aravalli.- Light Weight Freight Rolling Stock Bogie Frame:Design Methodology Validated with Field Oscillation Trials
Abstract Views :331 |
PDF Views:205
Authors
Affiliations
1 Govt. of India, Ministry of Railways, Research Designs and Standards Organisation, IN
1 Govt. of India, Ministry of Railways, Research Designs and Standards Organisation, IN
Source
International Journal of Vehicle Structures and Systems, Vol 9, No 4 (2017), Pagination: 245-250Abstract
Indian railway has improved the laden to tare weight ratio by producing lighter as well as higher strength bogie frame of freight rolling stock. Bogie frame is the crucial component of the rail vehicle which carries static load in the form of gross weight and dynamic loads arising from various track and wheel irregularities. The three piece freight vehicle bogie frame comprises two side frames and one bolster. The side frame; fitted with three piece bogie frame and responsible for the ride quality of the freight vehicle, is considered in present study. The locations suitable for weight reduction are found by finite element analysis (FEA), using side frame solid model in MSC FEA environment. International standards of the association of American railroad (AAR specification M-203) load cases and boundary conditions are deployed for analysis in the context of the operating scenario of Indian railways. Typical Indian railway track signatures are used as input for transient analysis. Time dependent stresses at critical speeds are used for fatigue strength evaluation as per Goodman diagram. The modified design is approx. 13.90% lighter and sustains 25.00 ton axle load in comparison of earlier 22.00 ton. Suggested topological changes have been compared by using frequencies of the initial and modified designs. Further, based on Indian railways running conditions, actual assessment and trial of the modified design bogie frame prototype has been carried out by Research Designs and Standards Organisation (RDSO). The results of the trial are found to be satisfactory and within the prescribed range.Keywords
Rail Vehicle, Side Frame, Axle Load, Solid Model, Goodman Diagram, Fatigue Strength.Full Text
References
- Truck Side Frame, Cast or Structural Design and Testing Specification, Association of American Railroad (AAR) M-203, 2007.
- Oscillation Trials of 25 t Axle Load Broad Gauge Bogie Open Wagon type GONDOLA 25t with up to Maximum Speed of 110 kmph in Empty and 85 kmph in Loaded Condition over CTC-PRDP Section of East Coast Railway, Report number MT-1383: 2014, Govt. of India, Ministry of Railways, Research Design and Standards Organisation, India.
- R.K. Luo, B.L. Gabbitas and B.V. Brickle. 1996. Dynamic stress analysis of an open-shaped railway bogie frame, Engg. Failure Analysis, 3(1), 53-64.
- Z. Ren, S. Sun, Q. Li and Z. Liu. 2011. Experimental studies of load characteristics of bogie frames for 350km/h EMUs, IMechE J. Rail & Rapid Transit, 226, 216-227. https://doi.org/10.1177/0954409711412012.
- S. Stichel and K. Knothe. 1998. Fatigue life prediction for an S-train bogie, Vehicle Sys. Dyn. Supplement, 28, 390-403. https://doi.org/10.1080/00423119808969573.
- D. Younesian, A. Solhmirzaei and A. Gachloo. 2009. Fatigue life estimation of MD36 and MD523 bogies based on damage accumulation and random fatigue theory, J. Mech. Sci. and Tech., 23, 2149-2156.
- https://doi.org/10.1007/s12206-009-0622-y.
- J.S. Kim. 2006. Fatigue assessment of tilting bogie frame for Korean tilting train: Analysis and static tests, Engg. Failure Analysis, 13, 1326-1337.
- S. Dietz, H. Netter and D. Sachau. 1997. Fatigue life predictions by coupling finite element and multi body systems calculations, Proc. ASME Design Engg. Tech. Conf., 1-9.
- Indian railways specification No. WD-17-CASNUB-22HS-BOGIE-92 (Revision-3) for CASNUB-22W, 22HS Cast Steel Bogies with Friction Damping Arrangement for Broad Gauge, 2006, RDSO, Ministry of Railways.
- S. Shukla, R. Gupta and N.S. Vyas. 2010. Weight reduction in an Indian railway CASNUB bogie bolster considering fatigue strength, Int. J. Veh. Str. and Systems, 2(3), 102-109. http://dx.doi.org/10.4273/ijvss.2.3-4.03.
- Programme of Tests to be Carried Out on Wagon with Steel Under Frame and Body (Suitable for Being Fitted With The Automatic Buffing and Draw Coupler) and on their Cast Steel Frame Bogies, ERRI B12/RP17, 1993, 7th Edition, European Rail Research Institute.
- Casting Details, Castings, Steels, Association of American Railroad (AAR) - M-201, 2007.
- J.E. Shigely. Mech. Engg. Design, McGraw-Hill Series in Mech. Engg., 10th Edition.
- Motive Power Units, Bogie and Running Gear, Bogie Frame Structure Strength Tests, UIC 615-4, 1994, International Union of Railways.
- V.K. Garg and R.V. Dukkipati. 1984. Dynamics of Railway Vehicle System.
- Third Report of the Standing Criteria Committee, Revision-l, TG-CR-4.2.3-1, May 2013, Government of India, Ministry of Railways, Research Design and Standards Organisation, India.
- UGS, NX 8.5, Users manual.
- User guide MSC FEA software 2010.
- Convergence of Deficient Quintic Spline Interpolation
Abstract Views :171 |
PDF Views:0
Authors
Affiliations
1 Department of Mathematics and Computer Science, R.D. University, Jabalpur-482001 (M.P.), IN
2 Department of Mathematics, Government P.G. College, Seoni (M.P.), IN
1 Department of Mathematics and Computer Science, R.D. University, Jabalpur-482001 (M.P.), IN
2 Department of Mathematics, Government P.G. College, Seoni (M.P.), IN
Source
The Journal of the Indian Mathematical Society, Vol 70, No 1-4 (2003), Pagination: 41-48Abstract
In this paper, we have obtained a precise estimate of error bounds for deficient quintic spline interpolant matching the given function values at the mesh points and at intermediate points between the successive mesh points.Keywords
Best Error Bounds, Deficient Quintic Splines, Interpolation.- SCATSAT-1 Scatterometer:An Improved Successor of OSCAT
Abstract Views :258 |
PDF Views:97
Authors
T. Misra
1,
P. Chakraborty
1,
C. Lad
1,
P. Gupta
1,
J. Rao
1,
G. Upadhyay
1,
S. Vinay Kumar
1,
B. Saravana Kumar
1,
S. Gangele
1,
S. Sinha
1,
H. Tolani
1,
V. K. Vithani
1,
B. S. Raman
1,
C. V. N. Rao
1,
D. B. Dave
1,
R. Jyoti
1,
N. M. Desai
1
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
Source
Current Science, Vol 117, No 6 (2019), Pagination: 941-949Abstract
SCATSAT-1 is the Indian Space Research Organisation’s (ISRO’s) newest Ku-band scatterometer which was launched on 26 September 2016 from ISRO’s space-port Sriharikota on-board the PSLV C35 mission. It is an advanced follow-on of OSCAT, ISRO’s first Scatterometer in space on-board the Oceansat-2 satellite, which ceased to operate in April 2014. OSCAT had been a globally acclaimed sensor during its lifetime. The data from SCATSAT-1 exhibit superior quality, and will not only serve the operational wind and weather prediction community in the years to come, but also hold the promise of securing a place in the long-term climate data records. SCATSAT-1 is a standalone scatterometer mission atop the Indian Mini Satellite (IMS-2) bus. The scatterometer payload is a two-beam, dual-polarized, conically scanning, pencil beam, real-aperture radar which measures near-surface wind vectors over ocean exploiting Bragg scattering resonance at Ku-band. It has been developed in ISRO’s Space Applications Centre, Ahmedabad in less than two and half years to replace OSCAT. Although it inherits the instrument specifications from OSCAT, several enhancements have been made in its hardware as well as in the payload characterization from the purview of miniaturization and performance improvement over OSCAT. This article highlights the hardware improvements, the payload characterization methods devised, and the performance enhancements of SCATSAT-1 over OSCAT. The in-orbit performance of SCATSAT-1 is also discussed.Keywords
OSCAT, SCATSAT-1, Scatterometer, Sigma-0.Full Text
References
- Misra, T. et al., Oceansat-II scatterometer: sensor performance evaluation, σ 0 analyses and estimation of biases. IEEE Trans. Geosci. Remote Sensing, 2014, 52(6), 3310–3315.