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R, Rahul.,Datta, P.K. The Korean Society for Aeronautical and Space Scie 2013 International Journal of Aeronautical and Space Sc Vol.14 No.1
This paper deals with the study of buckling, vibration, and parametric instability characteristics in a damaged cross-ply and angle-ply laminated plate like beam under in-plane harmonic loading, using the finite element approach. Damage is modelled using an anisotropic damage formulation, based on the concept of reduction in stiffness. The effect of damage on free vibration and buckling characteristics of a thin plate like beam has been studied. It has been observed that damage shows a strong orthogonality and in general deteriorates the static and dynamic characteristics. For the harmonic type of loading, analysis was carried out on a thin plate like beam by solving the governing differential equation which is of Mathieu-Hill type, using the method of multiple scales (MMS). The effects of damage and its location on dynamic stability characteristics have been presented. The results indicate that, compared to the undamaged plate like beam, heavily damaged beams show steeper deviations in simple and combination resonance characteristics.
Rahul R. Gadkari,Ashutosh Gupta,Uddesh Teke,Atul Awadhiya,Mohammad Shahadat,Wazed Ali,Apurba Das,Ramasamy Alagirusamy 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
In this study, a novel eco-friendly chitosan-cinnamaldehyde cross-linked nanoparticles (CSN) weresynthesised via a green route and deposited, in alternating combination with sodium tripolyphosphate(TPP), over polyester (PET) nonwoven fabric using layer-by-layer (L-B-L) coating technique. Thesuccessful deposition of a nano-level coating (upto 684.7 nm) of 10.5 bi-layers of CSN and TPP, i.e. (CSN/TPP)10.5, with CSN at the top, was achieved at individualfibre surface as confirmed via scanning electronmicroscopy. Fabric coated with (CSN/TPP)10.5 showed remarkable antibacterial activity against both theGram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, even with a lowconcentration of the nanoparticles (0.1 w/v). Moreover, the coating material possesses very low toxicityas revealed by the cytotoxicity test. The developed fabric could also adsorb metal ions like Pb2+, Cu2+, Fe3+,Ni2+, Zr4+ and Cd2+, etc. from water. The coating was found to be stable in alkaline and neutral pHenvironments. The slight reduction in the pore dimensions, air permeability and tensile strength of fabricafter coating were insignificant with respect to its potential applications in developing health careproducts, medical and health care textiles and dry or wet purification media.
Rahul R. Chakule,Sharad S. Chaudhari,P. S. Talmale 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
Grinding is a precision machining process widely used for close tolerance and good surface finish. Due to aggregate of geometrically undefined cutting edges and material removal in the form of microchips, grinding requires more specific energy as friction is greater in the grinding interface. The optimum use and proper penetration of coolant is the prime requirement which is achieved by effective cooling and lubrication. In this research, a greater focus is on MQL technique, which is economical and eco-friendly. The paper presents important aspects of the grinding process considering the surface roughness and cutting force. The experiments were carried out on horizontal surface grinding machine using Response surface methodology (RSM). In addition, evaluation of grinding performance parameters like coefficient of friction, cutting forces, temperature and specific grinding energy for different machining environments has been discussed. The lowest surface roughness and coefficient of friction observed was 0.1236 µm and 0.3906, respectively for MQL grinding, whereas lowest specific grinding energy was found as 18.95 N/mm 2 in wet grinding. The temperature recorded in MQL grinding was 29.07 °C, which is marginally higher than wet condition. The response obtained as cutting forces, temperature and surface roughness under MQL mode encourages its use for machining AISI D3 type material compared to other grinding environments. Mathematical modeling showing the relation between the factors and response variables was established using Response surface methodology. Regression analysis was performed to determine the accuracy of mathematical model, significant factors and interaction effects of parameters on responses.
Rahul. R.,P. K. Datta 한국항공우주학회 2013 International Journal of Aeronautical and Space Sc Vol.14 No.1
This paper deals with the study of buckling, vibration, and parametric instability characteristics in a damaged cross-ply and angle-ply laminated plate like beam under in-plane harmonic loading, using the finite element approach. Damage is modelled using an anisotropic damage formulation, based on the concept of reduction in stiffness. The effect of damage on free vibration and buckling characteristics of a thin plate like beam has been studied. It has been observed that damage shows a strong orthogonality and in general deteriorates the static and dynamic characteristics. For the harmonic type of loading, analysis was carried out on a thin plate like beam by solving the governing differential equation which is of Mathieu-Hill type, using the method of multiple scales (MMS). The effects of damage and its location on dynamic stability characteristics have been presented. The results indicate that, compared to the undamaged plate like beam, heavily damaged beams show steeper deviations in simple and combination resonance characteristics.
M. R. Rahul,Shital S. Chiddarwar 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.9
In the context of modern manufacturing, digitalization, real-time monitoring, and simulation are integral components that contribute to efficiency and energy awareness. This research paper aims to present a comprehensive framework of an intelligent robotic deburring system that incorporates elements from Industry 4.0 and virtual twin technology. The framework includes process planning, robot programming, and the creation of a virtual twin within a robotic deburring work cell. A key aspect of this framework is the utilization of deep neural networks for accurate burr identification, coupled with human-in-the-loop process monitoring. The integration of a virtual twin enables real-time process planning and enhances adaptability and flexibility to address dynamic changes during operation. A practical evaluation of the framework demonstrates its effectiveness, with the robotics deburring process achieving a significant 31% energy saving.
Nagawade, Rahul R.,Shinde, Devanand B. Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.12
Zirconium(IV) chloride is found to be an efficient catalyst for the electrophilic addition reaction of indole with aldehydes/ketones to afford the corresponding bis(indolyl methanes in good yields. The remarkable features of this new procedure are high conversions, shorter reaction times, cleaner reaction profiles and simple experimental and work-up procedures.
Salunkhe, Rahul R.,Jang, Kihun,Lee, Sung-won,Yu, Seongil,Ahn, Heejoon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.40
<P>Carbon nanotube and metal oxide/hydroxide hybrids have attracted much interest as electrode materials for electrochemical supercapacitors because of their dual storage mechanism. They can complement or replace batteries in electrical energy storage and harvesting applications, where high power delivery or uptake is needed. Multi-walled carbon nanotube (MWCNT) and nickel–cobalt binary metal hydroxide nanorod hybrids have been developed through the chemical synthesis of binary metal hydroxide on a MWCNT surface. These hybrids show enhanced supercapacitive performance and cycling ability. Growth of a thin film consisting of a coating of binary metal hydroxide, as well as further growth of nanorod structures, is demonstrated using FESEM and TEM, showing that this film is a promising structure for supercapacitor applications. These electrodes yield a significantly high capacitance of 502 F g<SUP>−1</SUP> with a high energy density of 69 W h kg<SUP>−1</SUP> at a scan rate of 5 mV s<SUP>−1</SUP>. The film is stable up to 5000 cycles with greater than 80% capacitance retention.</P> <P>Graphic Abstract</P><P>A novel composite material composed of cost effective pseudocapacitive nanostructures like Ni–Co hydroxide nanorods and CNT was fabricated on a stainless steel substrate and further utilized for supercapacitor applications. The electrodes yield a significantly high specific capacitance of ∼502 F g<SUP>−1</SUP> with an energy density of 69 W h kg<SUP>−1</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm32638h'> </P>
Aerosol types and radiative forcing estimates over East Asia
Bhawar, R.L.,Lee, W.S.,Rahul, P.R.C. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.141 No.-
Using the CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) and MODIS (Moderate Resolution Imaging Spectroradiometer) satellite data sets along with the CSIRO-MK 3.6.0 model simulations, we analyzed the aerosol optical depth (AOD) variability during March-May (MAM), June-August (JJA) along with their annual mean variability over East Asia for the period 2006-2012. The CALIPSO measurements correlated well with the MODIS measurements and the CSIRO-MK 3.6.0 model simulations over the spatial distribution patterns of the aerosols, but CALIPSO underestimated the magnitudes of the AOD. Maximum smoke aerosol loading is observed to occur during JJA, as a result of wind transport from Southern China while dust loading dominated during MAM via the transport from desert region. The vertical distribution profiles revealed that there is uniform distribution of smoke aerosols during both MAM and JJA, only differing at the altitude at which they peak; while the dust aerosols during MAM showed a significant distribution from the surface to 10 km altitude and JJA was marked with lower dust loading at the same altitudes. Both dust and smoke aerosols warm the atmosphere in MAM but due to the absorbing nature of smoke aerosols, they cause considerable cooling at the surface which is double when compared to the dust aerosols. The top of the atmosphere aerosol radiative forcing (ARF) due to smoke and dust aerosols is positive in MAM which indicates warming over East Asia. During MAM a consistent declining trend of the surface ARF due to smoke aerosols persisted over the last three decades as conspicuously evidenced from model analysis; the decline is ~10 W/m<SUP>2</SUP> from 1980 to 2012.