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Some stability analysis of a non-linear time-delayed feedback circuit

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Some stability analysis of a non-linear time-delayed feedbac...

Froth flotation of refuse coal fines and process optimization using 2D surface plots

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作者： shravan mohan Gaurav Raina the Department of Electrical Engineering Indian Institute of Technology Madras the Faculty of the Department of Electrical Engineering Indian Institute of Technology Madras

A key focus of this paper is on understanding stability in a non-linear circuit design subject to delayed feedback. The system we consider is an autonomous first order RC circuit, coupled with a non-linear element, with a fixed feedback delay. With time delays, stability is a key concern. So for the non-linear circuit model we first establish a sufficient condition for local stability. We then establish necessary and sufficient conditions for local stability. Additionally we also exhibit that when local stability is just lost, a Hopf type bifurcation would occur. For the non-linear system, this bifurcation signifies the emergence of limit cycles which can degrade performance. Practically, it is useful to obtain an estimate of the amplitude and frequency of the bifurcating periodic solutions. Such estimates are calculated using the method of harmonic balance. In addition to the local stability analysis, we also establish some global stability results and some conditions to ensure that the solutions of the governing non-linear system are bounded. Some of the theoretical insights obtained are complemented with numerical simulations and also with experiments which are carried out using off-the-shelf components. The combination of theory, both local and global, simulations and experiments serve to enhance our understanding of the underlying model.

关键词： Non-linear Circuit Time-delayed Feedback Stability Hopf Bifurcation Experiments.

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Journal of Central South University 2016年第10期23卷 2520-2525页

作者： shravan Kumar Veomesh Rawat Department of Fuel and Mineral Engineering Indian School of Mines

Refuse coal fines of size <500 μm was collected from a metallurgical coal preparation plant located in the eastern coalfield region of India. The coal was beneficiated using froth flotation technique to recover clean coal with ash content of about 20% with the highest possible yield. Diesel oil as collector and pine oil as frother were used. Box-Behnken statistical design was followed for analyzing the performance at varying pulp density, collector and frother dosage. Results were discussed using 2D surface plots. Response function predictions determined by the regression analysis show coefficient of correlation(R^2) for yield and the ash content as 0.72 and 0.86, respectively. The highest yield of 45.79% is obtained at pulp density 10%, collector dose 2 kg/t and frother dose 1.5 kg/t. The lowest ash content of 18.9% is obtained at pulp density 10%, collector dose 1 kg/t and frother dose 1 kg/t.

关键词： refuse coal froth flotation Box-Behnken 2D RSM

Performance analysis of jig for coal cleaning using 3D response surface methodology

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International Journal of Mining Science and Technology 2017年第2期27卷 333-337页

作者： Kumar shravan Venugopal R. Department of Fuel and Mineral Engineering Indian Institute of Technology(ISM)Dhanbad826004India

Beneficiation of coal of -4.76 mm + 3 mm size fraction was investigated in a laboratory model Denver *** variables were studied to analyze their effect on the performance of jig in terms of yield and ash content of clean coal. Three-factor three-level Box-Behnken design of experiments with response surface methodology(RSM) was employed to understand the performance behavior of jig. From the study, the bed height was found to be the most significant parameter affecting the yield and ash content of clean coal. It was possible to reduce the ash content from 24.32% in feed to an ash content of 16.55% in clean coal at 2 L/min water flow rate and 10 min jigging time. Influence of operating variables of the jig on responses was presented and discussed in 3D surface plots. The developed model was found to be significant within the range of parameters under investigation with correlation of co-efficient values as 0.99(yield) and 0.98(ash).

关键词： Coal beneficiation Jigging Bed height 3D-RSM Box-Behnken

Uncertainty-quantified parametrically homogenized constitutive models (UQ-PHCMs) for dual-phase α/β titanium alloys

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npj Computational Materials 2020年第1期6卷 677-696页

作者： shravan Kotha Deniz Ozturk Somnath Ghosh Departments of Civil Mechanical and Materials Science&EngineeringJohns Hopkins University3400 N.Charles StreetBaltimoreMD 21218USA

This paper develops an uncertainty-quantified parametrically homogenized constitutive model(UQ-PHCM)for dual-phase α/βtitanium alloys such as *** microstructures are characterized by primaryα-grains consisting of hcp crystals and transformedβ-grains consisting of alternating laths ofα(hcp)and β(bcc)*** PHCMs bridge length-scales through explicit microstructural representation in structure-scale constitutive *** forms of equations are chosen to reflect fundamental deformation characteristics such as anisotropy,length-scale dependent flow stresses,tension-compression asymmetry,strain-rate dependency,and cyclic hardening under reversed loading *** coefficients are functions of representative aggregated microstructural parameters or RAMPs that represent distributions of crystallographic orientation and morphology.

关键词： alloys deformation constitutive

Metaheuristics with Vector Quantization Enabled Codebook Compression Model for Secure Industrial Embedded Environment

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Intelligent Automation & Soft Computing 2023年第6期36卷 3607-3620页

作者： Adepu shravan Kumar S.Srinivasan Department of Biomedical Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesSaveetha UniversitySaveetha NagarThandalamChennai602105India

At the present time,the Industrial Internet of Things(IIoT)has swiftly evolved and emerged,and picture data that is collected by terminal devices or IoT nodes are tied to the user's private *** use of image sensors as an automa-tion tool for the IIoT is increasingly becoming more *** to the fact that this organisation transfers an enormous number of photographs at any one time,one of the most significant issues that it has is reducing the total quantity of data that is sent and,as a result,the available bandwidth,without compromising the image *** compression in the sensor,on the other hand,expedites the transfer of data while simultaneously reducing bandwidth *** traditional method of protecting sensitive data is rendered less effective in an environment dominated by IoT owing to the involvement of third *** image encryp-tion model provides a safe and adaptable method to protect the confidentiality of picture transformation and storage inside an IIoT *** helps to ensure that image datasets are kept *** Linde–Buzo–Gray(LBG)methodology is an example of a vector quantization algorithm that is extensively used and a rela-tively new form of picture reduction known as vector quantization(VQ).As a result,the purpose of this research is to create an artificial humming bird optimi-zation approach that combines LBG-enabled codebook creation and encryption(AHBO-LBGCCE)for use in an IIoT *** the beginning,the AHBO-LBGCCE method used the LBG model in conjunction with the AHBO algorithm in order to construct the *** Burrows-Wheeler Transform(BWT)model is used in order to accomplish codebook *** addition,the Blowfish algorithm is used in order to carry out the encryption procedure so that security may be attained.A comprehensive experimental investigation is carried out in order to verify the effectiveness of the proposed algorithm in comparison to other *** experimental values ensure that the suggeste

关键词： Codebook compression industrial internet of things lbg model metaheuristics vector quantization

Vibration Control of Vertical Turbine Pump by Optimization of Vane Pitch Tolerances of an Impeller Using Statistical Techniques

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Sound & Vibration 2021年第4期55卷 305-327页

作者： Ravindra Birajdar Appasaheb Keste shravan Gawande Kirloskar Brothers Limited Corporate R&DPune411045India Department of Mechanical Engineering MES College of EngineeringPune411001India

The objective of the study is to find the tolerance on vane pitch dimensions of a Vertical Turbine(VT)pump *** this purpose,the study is divided into two parts *** find the critical hydraulic eccentricity of a VT pump impeller by way of numerical simulations and design of experiments to find the vane pitch tolerance using critical hydraulic *** effect of impeller vane pitch deviations on hydraulic unbalance is examined for a vertical turbine pump using Design of Experiments(DOE).A suitable orthogonal matrix has been selected with vane pitch at different axial locations of an impeller as the control *** eccentricity,which is the output of the DOE experiments is analyzed using S/N ratio,ANOM and regression analysis to find the significant control factor effecting the hydraulic unbalance and hence *** vane pitch deviation at outlet and inlet of impeller shroud geometry are found to be the most critical factor affecting the pump vibrations.

关键词： Vertical turbine pump vibrations design of experiments hydraulic eccentricity

Multipliers on Vector-valued L^1-spaces for Hypergroups

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Acta Mathematica Sinica,English Series 2018年第7期34卷 1059-1073页

作者： R.SARMA N.shravan KUMAR Vishvesh KUMAR Department of Mathematics Indian Institute of Technology Delhi

In this article, we extend the well known Wendel＇s theorem to the context of vector-valued L1-spaces on hypergroups. In this regard, various cases have been studied.

关键词： Vector-valued Ll-spaces hypergroups multipliers translation invariant operators Fouriertransform

Synthetic biology techniques to tackle heavy metal pollution and poisoning

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Synthetic and Systems Biotechnology 2022年第3期7卷 841-846页

作者： Adithi Somayaji Soumodeep Sarkar shravan Balasubramaniam Ritu Raval Department of Biotechnology Manipal Institute of TechnologyManipal Academy of Higher EducationManipalIndia Manipal BioMachines Manipal Institute of TechnologyManipal Academy of Higher EducationManipalIndia

The requirement for natural resources and energy increases continually with the increase in *** inevitable result of this is soil,water,and air pollution with diverse pollutants,including heavy *** Biology involves using modular,interchangeable biological parts,devices in standard chassis or whole organisms to achieve a programmed result that can be quantified and optimized till it meets the required *** makes synthetic biology techniques very popular to tackle pressing global issues such as heavy metal *** review aimed to highlight various advancements as well as benefits,risks,and problems in synthetic biology techniques for detection,bioaccumulation,and biosorption of various heavy metals using engineered *** found that while such an approach is cost-effective,accessible,and efficient,there are several inherent technological and ethical issues including but not limited to metabolic burden and consequences of use of genetically modified organisms *** these hurdles will probably take time and innumerable conversations,and should be done through education and a culture of responsible research,rather than enforcing restrictions on the development of synthetic biology.

关键词： Heavy metals Biosensors Bioremediation Synthetic biology Responsible research

Socio-scientific quantification of the comprehensive benefits of debris flow mitigation measures for villages in western Sichuan, China

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Journal of Mountain Science 2024年第5期21卷 1598-1612页

作者： DENG Ting XU Pei LI Ming LU Yafeng WANG Yukuan LI Zhengyang shravan Kumar Ghimire Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610299China University of Chinese Academy of Sciences Beijing 100049China

Debris flow hazards seriously threaten thesafety and sustainable development of mountainousareas. Numerous debris flow mitigation measures havebeen implemented worldwide;however, acomprehensive assessment of the specific disasterreduction effects of these measures and their economic,social and ecological benefits is yet to be *** western region of Sichuan Province frequentlysuffers from geohazards such as debris flow, and thegovernment has adopted many mitigation *** study assessed the benefits of debris flowmitigation measures and identified the key influencingfactors via a field-based study conducted in 81 villagesin western Sichuan province, China. A framework forthe evaluation of the benefits of rural debris flowmitigation measures was constructed andquantitatively evaluated using a survey. Snowballsampling was performed to recruit 81 village leadersand 468 farmers. The results showed that managementand engineering measures were the main methodsused to mitigate debris flow;ecological measures wereauxiliary. The average satisfaction scores of farmers forthese three types of measures were 4.07, 3.90, and 3.56,respectively (as measured on a five-point Likert scale).In contrast, in terms of the benefits of these mitigationmeasures, only a small proportion of villages (11.11%)obtained a high level of comprehensive benefits fromthe debris flow mitigation measures, while the majority(88.89%) received medium to low-level benefits. Toimprove this situation, we further studied and foundthat the main factors that restricted villages fromachieving high-level comprehensive benefits were theunpredictable nature of debris flows, labour forceoutflow and remoteness. Effective control measures, agood economic environment and strong governmentassistance were reported as crucial factors forimproving these comprehensive benefits. This studyprovides socio-scientific references for decisionmakingon rural debris flow mitigation measures while keeping villages at the

关键词： Mitigation measures Comprehensive benefit evaluation Debris flow Mountain development Rural areas