THAKUR PRASAD DABY MISHRA - Academia.edu (original) (raw)

Papers by THAKUR PRASAD DABY MISHRA

A study was conducted to evaluate the current production capabilities of the Mark One ® 3D printe... more A study was conducted to evaluate the current production capabilities of the Mark One ® 3D printer in printing carbon fibre reinforced thermoplastic (CFRTP) tensile test specimens according to the JIS K 7073 by making use of fused deposition modelling. Several different types of CFRTP tensile test specimens are printed and are tensile tested in the longitudinal direction to obtain an overview of the mechanical properties of 3D printed CFRTP material. These properties are compared with the literature values known for composite materials to see if these agree. The main goal of this research is to increase the knowledge of the 3D printing process of CFRTP and to later use this knowledge to further improve the 3D printing process to obtain stronger 3D printed CFRTP materials .

This paper presents the available technique and discusses the difficulties to implement intellige... more This paper presents the available technique and discusses the difficulties to implement intelligent robots in next-generation automobile assembly. First, it presents the status of automobile assembly line, analyzes the problems and difficulties of current industrial robots-based assembly systems, and summarizes the technology needed to overcome the problems and difficulties. Then, it presents the new technology for intelligent assembly developed at National Institute of Advanced Science and Technology (AIST), which can be directly used to implement intelligent robots for automobile assembly. Next, the paper analyzes the drawbacks of the newly developed technology and discusses remaining challenges, and presents our view of next-generation automobile assembly systems.

The theory of dynamic interactions suggests a new paradigm of mechanics and initiates us into a n... more The theory of dynamic interactions suggests a new paradigm of mechanics and initiates us into a new area of knowledge, hitherto undeveloped. In this paper, we describe the innovations that this theory brings to physics, and in particular, the ideas expressed on new book by Doctor Barceló: New paradigm in physics. It is necessary to analyse the incorporation into mechanics not only of knowledge about bodies with inertial movement, but also that of non-inertial systems. It is necessary a new structure of knowledge that can incorporate both inertial and accelerated systems. On this paper we referred to the main innovations and novel ideas proposed by Doctor Barceló on his new book, in relation to the rotational dynamics.

This article focuses on the study of the defined values of tensile strain and the effect of low t... more This article focuses on the study of the defined values of tensile strain and the effect of low temperature plasma adhesion selected coatings on steel samples using a tensile testing flat test bars. Samples were made by machining and welding technologies. The flat test bars were tested by pulling on a test rig UPC 1200. Part of the samples was treated on the surface prior to coating by a tensile test, second base coat and with a final coat continuous multi plasma system. The selected test samples were determined from the tensile test of the material characteristics apparent from the tensile diagrams. The examined samples were fitted top and base coat. Another group was the KTL basis. The presented graphs show the dependence of the strength on elongation of a sample according to DIN EN ISO 6892-2. The samples were then examined under a stereo microscope SCHUT brand, type SSM-E in the laboratory to conduct coating on a steel sheet at the moment of total violation sectional samples. The base layer, in which the temperature ranges from 160˚C-180˚C, was applied by electrophoresis method.

This paper presents the reference criteria of rotational dynamics of accelerated systems in the f... more This paper presents the reference criteria of rotational dynamics of accelerated systems in the field of Rational Mechanics, exposing the differentiation between inertial and non-inertial dynamic systems, and describes the unique research project developed by Advanced Dynamics CB up to proposing the Theory of Dynamic Interactions. This paper aims to deliver a commentary on developments in the field of rotational dynamics. Professor Barceló proposes that in today's physics, a change of mindset is necessary that allows us to accept the true behavior of mobile objects subject to non-coaxial speed variations. The proposed dynamic allows us understand certain effects of rotating bodies. The application of these dynamic hypotheses to other fields of physics and technology will possibly allow new and suggestive advances in research, especially to bodies and systems with rotation in astrophysics and astronau-tics, allowing new dynamic working hypotheses.

Kashmir lies in region where temperature in winter is very low. The temperature in Kashmir is oft... more Kashmir lies in region where temperature in winter is very low. The temperature in Kashmir is often below 0°C during couple of months winter. Concrete mixed, transported and placed under low temperatures requires an understanding for the adverse effects of such environmental factors on the durability of concrete. The damage caused by extreme weather conditions can never be fully eliminated but efforts can be made to minimize these adverse effects. This research was undertaken to investigate the effects of Extreme weather on different properties of concrete and influence of early temperature on the strength of concrete.

Energy is the major source for the economic development of any country. In recent years, India en... more Energy is the major source for the economic development of any country. In recent years, India energy consumption has been increasing at a relatively fast rate due to population growth and economic development. Energy plays substantial role in economic, hence relationship between energy consumption and economic growth is an important issue for economists. Renewable Energy (RE) has been identified as a key tool to counter climate change and enhance energy security. In India growth of the economy places heavy demand of electric power, Presently Coal-based power generation is characterized by local and regional environmental degradation as well as greenhouse gas emissions, leading to climate change. Thus, there is need for enhance energy security along with reducing greenhouse gas emissions. Renewable energy is one of the environmentally friendly sources of energy and effectiveness of growth economic, in this article will be show that an effects of RE for economy in India.

Electrochemical machining is a relatively new technique, only being introduced as a commercial te... more Electrochemical machining is a relatively new technique, only being introduced as a commercial technique within the last 70 years. A lot of research was conducted in the 1960s and 1970s, but research on electrical discharge machining around the same time slowed electrochemical machining research. The main influence for the development of electrochemical machining came from the aerospace industry where very hard alloys were required to be machined without leaving a defective layer in order to produce a component which would behave reliably. Electrochemical machining was primarily used for the production of gas turbine blades or to machine materials into complex shapes that would be difficult to machine using conventional machining methods. Tool wear is high and the metal removal rate is slow when machining hard materials with conventional machining methods such as milling. This increases the cost of the machining process overall and this method creates a defective layer on the machined surface. Whereas with electrochemical machining there is virtually no tool wear even when machining hard materials and it does not leave a defective layer on the machined surface. This article reviews the application of electrochemical machining with regards to micro manufacturing and the present state of the art micro electro-chemical machining considering different machined materials, electrolytes and conditions used.

Mechanical vibrations cause forces that affect human bodies. One of the most common positions for... more Mechanical vibrations cause forces that affect human bodies. One of the most common positions for human bodies is the seated position. In this work, mathematical models of the seated human body are investigated and simulated in a Simulink/ MATLAB environment. In addition, segments of the human body are studied and models are developed and built by using Simulink/MATLAB. As part of this work, model analysis and state-space methods are used in order to check and validate the results obtained from the simulations. Two types of forces are used to test the whole seated human body under low frequency citation. The first is a sinusoidal wave signal based on literature, and the second is an impulse function. The effects of mechanical vibration on the head and lumbar are studied as these parts of the human body are usually the most effected areas. Kinematic states of the head segment and lumbar are considered. The characteristics of the vibration response on the two segments are also obtained. In addition to the mechanical vibrations study, this paper is a resource for the development and implementation of models in the Simulink/MATLAB environment.

In cam milling process, cutting force is a variant factor during every time period and cam has a ... more In cam milling process, cutting force is a variant factor during every time period and cam has a quite complex profile that leads to alternate force direction. These consequently, create machine vibration. The dynamic behaviour of machine can be predicted approximately if it is represented by a mathematical model. This paper shows result of cam cutting machine's dynamic, which used Lagrange's equation to solve. In this case, the machine vibration is surveyed only dimensions such as X and Y through using cutting condition with alloy cutting tool to mill a 10 mm thickness steel cam. The machine is modelled into the two degree of freedom vibrating system follow X and Y direction. Each of X and Y table equal to the compound: stiffness, damper and mass, which applied as constant coefficients in Lagrange's equation. On the other hand, analysing cam characteristic and milling process in detail provides the resultant cutting follow X and Y in order to become external force of previous equation. After giving data in sufficient that necessary for problem, Matlab Simulink displays the vibration of X, Y for two states tangent force factor K t =299.3 and K t =598.6. At the end, it gives a comparison between these states.

Carbon Nanotube and Graphene Aerogels (CNTAs & GAs)-the world's lightest 3D materials (GA isseven... more Carbon Nanotube and Graphene Aerogels (CNTAs & GAs)-the world's lightest 3D materials (GA isseven times lighter than air -a cubic meter weighs just 160 grams) attracted widespread attention due to their excellent mechanical compressible properties, high temperature and thermal stability, recyclable and highly efficient organic pollutants adsorption capability (GA can absorb up to 900 times its own weight in oil and do so quickly, with one gram of Aerogel able to absorb up to 68.8 grams of organics per second). In this review, we present briefly recent progress in synthesis methods for fabrication of 3D CNTAs andGAs and their emerging applications in the field of environmental protection such as removingoil, organic pollutants, arsenic ions and other toxic metalsfrom water. Furthermore, to assist advanced research for practical applications of these 3D materials, the technical challenges are discussed, and future research directions are proposed.

Bringing sunlight inside buildings to decrease the electricity needed for lighting, to provide na... more Bringing sunlight inside buildings to decrease the electricity needed for lighting, to provide natural light, and to decrease the energy needed for cooling has been a major technology research interest referred to as daylighting. Fiber optic daylighting (FOD) systems are an evolving technology that may provide a solution for daylighting technology. These systems use fiber optics combined with solar light collectors to transmit daylight to spaces historically difficult to daylight, using sidelighting or toplighting strategies. This research aims to show the energy conservation capability and efficiency of FOD as compared to Artificial Lighting. Calculations will highlight efficiency and performance for the design concepts. These calculations are intended to show how much energy conservation can be achieved with better illumination from FOD as compared to lighting generated by solar power (PVC) system, for the same sun intensity captured by the sun collectors of the two systems and the same length of cable. Matlab / Simulink software was used in simulating the efficiency and performance for the design concepts.

A project of electrical rocket engine of the future, which operates on principle of a magnetoplas... more A project of electrical rocket engine of the future, which operates on principle of a magnetoplasmadynamic engine, is being considered. New concept of the superconducting magnetic system, stipulating installation of external field winding, in which the current is directed parallel to longitudinal axis of the engine, makes it possible to increase the magnitude of the transversal magnetic field in working chamber, to decrease the rated current and to raise the engine efficiency. On the basis of equations that describe the process of converting electrical energy into mechanical energy, a mathematical model has been composed with whose help the characteristics of magnetoplasma engine having conventional design and the characteristics of the engine being developed in the project have been determined. Conducted research has shown that new design increases engine efficiency from 50% up to 91%. The project also contains a consideration of the new engine design with movable cathode and with cathode having forced cooling which helps to reduce carryover of cathode mass and to increase lifetime by several times. In conclusion, the results of calculations and constructive development of electrorocket engine for flight towards planet Jupiter, which creates tractive force of 250 N at 2500 kW power , are given.

Space is still a frontier. The advantages of research in microgravity conditions are still someho... more Space is still a frontier. The advantages of research in microgravity conditions are still somehow a private niche of big aerospace contractors and main space agencies. But the landscape is changing and an incipient effort is being pursued to open space frontiers to small and medium-sized companies, universities, under-developed countries and non-profits. We will revise the advantages of microgravity research and a tool to conduct it at low-cost, rapid response and flexibility through the use of nanosatellites opening thus space frontiers to a wider audience. These highly capable satellites can support a wide range of mission objectives, from pure research to technology demonstrators and space qualification tests. The small satellites market is valued 600 M USD to 1.000 M USD yearly with an estimated 2.200 to 2.700 needed launches in the 2015-2020 timeframe. We will also introduce a new launcher under development to serve specifically the nanosatellite incipient market to help solve the scarce launching opportunities served today by conventional launchers.

Gasoline engines are increasingly popular for use in small unmanned aircraft requiring endurance ... more Gasoline engines are increasingly popular for use in small unmanned aircraft requiring endurance due to the specific energy of gasoline (47.3 MJ·kg −1) and its cost effectiveness. However, gasoline is volatile and it poses a health hazard. In this work, isopropanol is proposed and investigated as viable fuel for small gasoline engines. Isooctane is used as a benchmark for performance comparison. The field testing reveals that isopropanol offers similar running performance and ease of starting. The maximum output power of isopropanol is surprisingly found to occur at a more advanced ignition timing compared with isooctane. The significant outcome of this study is that isopropanol can readily be used as a replacement fuel for existing engines without the need for any modifications to the ignition module or the engine itself.

Terminal velocity is the highest velocity attainable by an object as it falls through a fluid (e.... more Terminal velocity is the highest velocity attainable by an object as it falls through a fluid (e.g. water or air) and there is no acceleration. Free-fall Free-fall is the downward movement of an object towards the ground under the force of gravity only. The equation for the drag on a skydiver at terminal velocity: Drag = 0.5 (Velocity 2 × Air Density × Surface Area × Drag Coefficient) Equation B Weight = Mass × Gravity Force = Mass × Acceleration Equation C Fluid Pressure = (Volume of Air × Air Density × Acceleration) / Area Equation D Upward Buoyancy Force = Net Air Pressure × Surface Area = (Volume of Air × Air Density × Acceleration) / Area) × Surface Area = Volume of Air × Air Density × Acceleration = Mass of Air × Gravity where the buoyancy force is measured every second. Abstract Estimates show that skydivers in free-fall displace a mass of air downwards equal to their own mass every second, in order to maintain a constant terminal velocity. This is also demonstrated at indoor skydiving centers where air blown upwards can suspend skydivers in mid-air. Like a boat floating in water, the skydiver is floating on air. Consequently, Archimedes principle of buoyancy can be used to explain the physics of terminal velocity in skydiving. Conventional physics explains that drag, the force needed to push air out of a skydiver's path, sets a limit to a skydiver's velocity. Which is correct but incomplete. It is more accurate to add that according to buoyancy, the skydiver's velocity will increase until a mass of air equal to his own mass is displaced each second. Drag on a skydiver is defined by the equation: Drag = 0.5 (Velocity 2 × Air Density × Surface Area × Drag Coefficient) This equation has severe limitations as It relies on a drag coefficient which must be already known in order to calculate terminal velocity. Worse, this drag coefficient cannot be directly measured and changes constantly. Why is this important? This demonstrates that buoyancy applies to objects that move and is measured over a one second time period. At present, buoyancy is only applied to stationary objects, such as boats or balloons. Also, buoyancy provides a simpler and more accurate method to estimate terminal velocity, without having to know the drag coefficient. This paper predicts that all objects falling at terminal velocity will displace a mass of fluid equal to their own mass each second to maintain buoyancy and a constant terminal velocity. An explanatory video: " Buoyancy explains terminal velocity in skydiving, " is available on youtube, on channel of 'N Landell'

Buoyancy explains how planes fly. To fly a plane needs to displace a mass of air down equal to it... more Buoyancy explains how planes fly. To fly a plane needs to displace a mass of air down equal to its own mass, each second. Planes are effectively floating on a cushion of air that the wings create by pushing air downwards. This is a similar explanation to how boats float according to Archimedes principle of buoyancy, and how birds fly by pushing air downwards. Correspondingly, this theory predicts that for all planes to fly, they must displace a mass of air down equal to its own mass each second.