für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Glass fibre-reinforced polymer have been used as an alternative to steel in concrete due to high strength-to-weight ratio, high stiffness-to-weight ratio, and corrosion and fatigue resistance. The main environmental factors for the deterioration of GFRP sandwich composites are temperature, sunshine, water/moisture, alkalinity and load. In this an experimental investigation has been carried out to study combined effect of chosen parameters moisture and temperature & also to study the rate & magnitude of damage of GFRP sandwich structure composites under hygrothermal loading conditions. The sandwich structure composed of E-glass fibre, polystyrene (thermocol core) and epoxy resin were subjected to three point bending test to assess bending strength. Two thermocol cores with different thickness (8mm and 16mm) were investigated. It has been observed that the sandwich structure with higher core thickness withstand a higher bending load show less flexural stress and flexure modulus when compared with low core thickness. Higher percent bending pre-loads lead to higher degradation in maximum flexure load as well as flexure modulus and flexure stress. ····· 1036119701
für 49.41€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray 1- This study shows the ability to successfully cold-spray 316L stainless steel using nitrogen and helium as a propellant gas. The microstructure was characterized with low porosity and fine grain structure. In addition, after post-processing heat treatment, the microstructure became denser (i.e. lower porosity). The microhardness did not change with 400°C annealing temperature but decreased significantly at 800°C, which can be explained by the recrystallization that occurs during cold-spraying. Both the ductility and strength were improved after annealing at 1100°C, in particular. 2- This study shows the ability to successfully cold-spray composite 316L-CoCr using nitrogen as a propellant gas with Co-Cr volume fractions (i.e. 25%, 33.3%). The deposition efficiency decreased with increasing the amount of Co-Cr. The microstructure is characterized by low porosity level in the first two mixes. At 50% as mixed Co-Cr and 316L, the actual as coated material was 33% Co-Cr, due to difficulties in bonding Co-Cr particles to each other. Thus, the porosity was high at the 50% mixture and cracks were also apparent. ····· 1036119533
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The work discusses different control strategies based on magnetic actuators applied to rotating machines. The first part is devoted to the vibration control obtained with Magnetic Dampers in different configurations: Active, Semiactive and Selfsensing Active Magnetic Damping. The design of the dampers and of the control laws is exposed. The second part deals with the levitation control based on Active Magnetic Bearings of a miniaturized gyroscope for automotive/aerospace applications. The design of a robust Hinf control and of a decentralized control is explained. Overall the book a detailed overview of technological advantantages and drawbacks of magnetic actuators in rotordynamics applications is exposed as well as an outlook of future developments and research lines. ····· 1036119491
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Distributed generation is nowadays regarded as the future of energy production. In this work, two engineering energy systems have been studied, namely horizontal axis wind turbines (HAWT) and an innovative heat exchanger for recuperated and externally fired gas turbines. The two topics share the final target, which is power production in a distributed generation perspective. The aforementioned two energy systems have been studied with a similar scientific and technical approach: after an initial review about the background, a modeling tool has been specifically developed for each topic. The models have been then validated against experimental data, taken from the literature (HAWT) or directly from an in-house built test bench (immersed particles heat exchange). Once the confidence of the models had been assessed, they have been employed to optimize the energy systems, particularly with regards to some of their geometrical features. In both cases, the study allowed et to obtain some possible design improvements of the systems, et to enhance the engineering knowledge of them. The analyses conducted may be useful to graduate students in Mechanical Engineering and energy professionals. ····· 1036119424
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The aim of this Master thesis is to explore the impact of design parameters on material flow efficiency in terms of space and time utilization. The factory material flow design process is an essential part of any manufacturing. The challenge for this project was to expose the components for the assembly operator within the space designated for materials at the workstation, meanwhile minimizing non-value-adding work and creating good ergonomics so that operators can achieve high workstation performance. In this study a new General Motors Powertrain manufacturing plant was considered as a case study for the design of internal material flow and implementation of lean principles. The research work was based on action research strategy where the researcher starts with a particular problem that he wants to solve, or understand better, usually within the environment where he is working. The ndings underline the importance of each design parameter in the application of lean principles. The main conclusion to be drawn from this study is that the material flow design process can still require a continuous improvement based on production targets and the best practices from other companies. ····· 1036119410
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray During the 2nd world wide war, the wear rates in mechanical components of planes which were in Al-Aalamain (at the north west of Egypt region), were three times as those in the European countries. The main reason for these high rates of mechanical wear is the high rates of dust due to environmental issues and conditions. Cement factory is a clear example of such dusty environment. The cement industry is very important industry in our age. So we want to see what are the problems and difficulties facing this serious industry in our eastern region. More than 70% of the wear causes are due to the contaminants coming from dust and sand particles in the ambient. The very high dusty contaminated environment causes the increasing of wear rates and failure of mechanical components. In this study, the aim is to make a simulation of the practical situation between two adjacent surfaces which must be separated by a fluid film. The used lubricant is Paraffin oil which is the basis for all mineral oils. The experiments were conducted using a CROSS-PIN tester in which the contact between two adjacent surfaces in a point, after that the Wear Scar Diameter (WSD) is measured. ····· 1036119397
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Forging is one of the oldest metal working operations known and is used in making parts of widely varying sizes and shapes from variety of metals Closed die forging is one types of forging process in which different types metal are deformed plastically to obtain the required product geometry in a closed cavity that contains shape of the product. The physical phenomena of forging operations, which numerous advantages it has, therefore, are difficult to express with quantitative relationships. The metal flow, friction at the tool/material interface, the heat generation and transfer during plastic flow, and the relationships between microstructure/properties and process conditions are difficult to predict and analyze. Therefore, in most of the time products and their corresponding dies are made by trial and error to reach to the final correct product shape, which is a costly process as materials are wasted in the process as well as it takes considerable time of the expert involved in the operation. With the applications of finite elemental method some of the problems of analysis could be reduced significantly. FEM softwares are very much important in this regard. ····· 1036119328
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Sloshing is the low frequency oscillation of the free surface of a liquid in a partially filled container. If not controlled effectively, sloshing may cause excessive dynamic loads which may lead to structural failure (in case of storage containers) or loss of dynamic stability (in case of transport vehicles). Hence, study and control of liquid sloshing is a well justified topic in engineering and science. Container flexibility causes moving boundaries which further complicate the treatment of this already challenging problem. On the other hand, container flexibility may be treated as a design parameter to gain benefit in controlling the free surface oscillations. Although numerous studies have been reported in the literature, attempts to control sloshing have been relatively limited. This book details numerical predictions using standard finite elements software (ANSYS) for the simulation of liquid sloshing in a flexible container. ····· 1036119302
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The aim of this book is to show how to use Tecnomatix Process Simulate software to design and validate modular fixtures concurrent with process planning tasks. The unchangeable need of securing and locating parts during different manufacturing processes turned the fixtures to key elements in production industries, but the iterations between design engineers and manufacturing planners because of late collision detection of the part/fixtures with robots cost a lot of time and money. Therefore, the lead-time can be reduced by developing tools and/or methods for early verification of the fixtures during the simultaneous engineering phase. To do so, Different aspects of fixture designing, modeling and simulating is investigated in this study. The focus of this book is on the fixtures designed for robotic applications specifically in Automotive Body in White lines. ····· 1036119294
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the present study, it is experimentally examined and verified the effectiveness of fluid jet pulses to actively control the vibrations of flexible structures. The operating principles and capabilities of the proposed control system are understood by applying them in a simplified small scaled laboratory structure, which contains the basic dynamics of real structures. The efficiency of the jet pulses as an active control system, for a wide range of base excitations, is experimentally verified. All the experimental studies demonstrated the relation governing the reduction of vibration levels with the jet air pressure. The achieved reduction in the intensity of the oscillations exceeds 50% of the oscillation without the effect of the control system. The successful studies performed on the simplified laboratory structure are promising for active vibration control using jet pulses of more complicated structures such as civil engineering metallic structures, lightweight aerospace structures, robotic arms, axially moving systems, cable stayed structures, oil platforms and any kind of coastal structures that are prone to vibrations coming from ambient and operational loads. ····· 1036119258
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Lasers are increasingly used to weld various kinds of materials. However, it is important to control the formation process of the weld seam in order to receive the required joint design. For this reason it is necessary to get an extensive knowledge of the correlation between the laser parameters and the geometrical dimensions of the weld seam. The presented research investigates the weld seam formation process of two high strength steels using a high brilliant fiber laser. ····· 1036119206
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Dr Balla Srinivasa Prasad at present working as an Assistant Professor in Mechanical Engineering department, GIT, GITAM University, Visakhapatnam, India. He was awarded Ph.D by Andhra University in 2010 for his research work at Andhra University in the area of automated process monitoring by using machine vision techniques. Dr Balla received his Master s in Production Engineering from S V University, Tirupati, India. He was graduated in Mechanical Engineering from Andhra University, India. He has more than Eleven years of experience in teaching at UG and PG level. Dr Balla`s research area includes Tool condition monitoring, 3D surface topography, Vision systems applications in the field of Manufacturing. ····· 1036119182
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray High performance polymers generally exhibit very high melt viscosities as result of their high molecular weight. They are therefore very difficult to process and require heavy-duty processing equipment. In some cases they cannot be processed at all using conventional melt processing techniques. In spite of this processing restriction, there is high demand for microparts from high performance polymers due to their excellent properties. In this study, a novel processing method called Thermo Flow Forming (TFF) has been developed for manufacturing parts made from high performance polymers. The TFF process is based on the flow of polymer material in its thermoelastic state, between its glass transition and melting temperatures, by compressive flow thermoforming. The TFF process has been successfully tested using high performance polymers such as polyphenylene sulfide (PPS), polyetheretherketone (PEEK) and unmouldable polytetrafluorethylene (PTFE). Thus, the TFF is a realistic alternative technique to the existing micromoulding processes. It can replace the wasteful and inefficient conventional machining of microparts made from unmouldable high performance polymers such as PTFE. ····· 1036119159
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Neural interface technology is an emerging field at the intersection of frontline neuroscience, engineering, computer science, and clinical neuroscience. This rich cross-disciplinary thrust promises to provide devices that restore or replace lost functions in neurologically impaired humans and that aid diagnosis and treatment of nervous system disorders. Electronic activation of specific areas of the nervous system has already demonstrated impressive developments such as cochlear implants and deep brain stimulators. On the other hand, high density neural interface connectors that acquire and transfer neural signals are at a much more primitive stage of development, posing technical challenges. This work describes the research and development of a high density connector to interface with high precision neural interface systems. The connector is tested and validated to be able to use as a medical product for animal and human use. ····· 1036119153
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Ethiopian Garment Industries (EGIs) are not competitive in the global market. One of the main reasons is low productivity. The main objective of the study is to develop a method that supports productivity improvement of EGIs. To achieve this objective, a literature survey has been conducted to get empirical knowledge. The existing productivity measurement and improvement practices, and productivity factors of EGIs have been assessed using questionnaire and secondary data. In order to make the study practical and realistic, a case study has been conducted on Novastar Garment PLC. The result shows that the productivity of EGIs and the case company is low when it compared with the best practice. The partial and total productivity indicators of the case company show under target performance. Most of surrogate productivity and process indicators of the company show poor status. To solve the problems associated with these productivity factors, sustainable and organized productivity improvement program is required. To improve the productivity, a method called Productivity Improvement Method (PIM) has been developed for EGIs. ····· 1036119132
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Turbomachinery design and optimization using numerical technique has been presented in this book. Reynolds Average Navier-Stokes (RANS) equation based solution approach has been explained to design the system. Single as well as multi-objective optimization techniques are presented along with the analysis of flow field. Several surrogate based optimization techniques including a weighted average method was used for optimization. The Turbomachinery designers trying to enhance the system performance can follow the procedure explained in this book. In short, the books can be helpful for the Turbomachinery designers and academicians. This book may also be of general interest of designers and researchers who want CFD simulation of any system via RANS and want to apply systematic approach for optimization. ····· 1036119125
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray UTILIZATION OF BIOMASS AS FILLER IN POLYMER COMPOSITES - This book contains various biomass fibers and filler obtained from local area (Malaysia), such as bamboo, wood saw dust, rice husk, sugarcane bagasse and kenaf. It covers an experimental data on the effect of various important parameters (percentage of filler loading, types of filler and matrix used, and chemical modifications) on the processing and synthesis of the polymer composites. It also provides valuable information regarding physical, mechanical properties and biological studies on thermoset and thermoplastic filled composites. The research presented in this book was compiled from our published manuscripts in several international journals including Polymer Composites, Journal of Reinforced Plastics and composites, Journal of Applied Polymer Science, Polymer Plastics Technology and Engineering, Journal of Korean Wood and also Science Malaysiana National Publications. ····· 1036119116
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray As a prerequisite for relevant model development and improvement of design methodologies for supersonic vehicles, this study aims at investigating the influence of wall heat-transfer and shock interaction on the turbulence structure of supersonic boundary layers. Incipient separation conditions and two different wall thermal boundary conditions (adiabatic and cold) are considered. The analysis focuses on the evolution of mean and turbulent flow properties along the interaction region and in the relaxation region downstream of the shock-system. The strong influence of the mean pressure gradient is quantified through the analysis of mean flow profiles and boundary layer integral parameters. The anisotropic amplification of turbulent quantities through the interaction region is characterized and the turbulent events associated with the modification of the turbulence structure of the perturbed boundary layer are identified. The mean and turbulent thermal fields are shown to be strongly modified by the wall cooling which significantly dampens more particularly the turbulent thermal quantities levels across the boundary layer. ····· 1036119060
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book describes the methodology and characteristics of hard coatings on tool steel, viz. TiN coated on high-speed steel and D2 tool steel by cathodic arc physical vapour deposition (CAPVD) technique. The main drawback of CAPVD, however, is the formation of macrodroplets (MD s) during deposition, resulting in films with rougher morphology. The presence of MD s in the coating is a serious problem during practical tooling applications. Standard characterization techniques and equipment were used to analyze and quantify the deposited coatings. The MD s contamination and growth mechanisms were investigated as a function of various process parameters. The results showed that the nitrogen flow rate was the most important factor in controlling the size and number of the MD s. 3D AFM images and electron microscopy indicated that the MD s were generated during the etching stage and protruded through the TiN film during deposition process. The TiN coating thickness decreased from 7.1 to 5.7 µm as the bias voltage is increased from zero to -150 V. The effect of ion etching was also investigated. The coatings deposited on HSS exhibited better adhesion compared to those on D2 tool steel. ····· 1036118808
····· lezzter Preis 59.00€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Electric Discharge Machining is one of the most popular, efficient and accurate machining processes. The major aim of the project is the thermal modeling of EDM sparks. Thermal modeling of EDM has been undertaken quite a few times in past decades and literature presents various arguments to its formulation. However, many previous models significantly over predict the process performance possibly due to the simplifying assumptions, hence there is a need to develop a more accurate and realistic thermophysical numerical model for EDM by analyzing the spark phenomenon and mechanism of material removal in EDM. The present project aims to present a numerical model for predicting temperature distribution over workpiece surface due to single and multiple EDM sparks, with realistic characterization of boundary conditions, other factors behind the actual conditions governing the process. The Material Removal Rate (MRR) has also been calculated using the results for the above case. Parametric studies are performed on multiple sparks model with and without material erosion to understand the influence of various input process parameters on the performance measures such as crater depth and MRR. ····· 1036118628
für 55.71€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Today`s manufacturing industry is not for the passive player, it requires the best in competitiveness, innovation, speed and agility. It is an industry where complexity and competition is ever increasing. As distributors and customers push industrial manufacturers to increase their flexibility, the rules of engagement are altering and the factors upon which companies compete are changing. This change has been increased the level of competition of manufacturing SMEs. The best way to response to this challenge of global competition is through the ideal of World Class Manufacturing. World class manufacturing is a collection of concepts, which set standard for production and manufacturing for another organisation to follow. World class manufacturing is a process driven approach where various techniques and philosophy are used in one combination or other. The aim of this work is to present establishments of application of World Class principles in the electronic industry in order to make products of the highest quality eliminating losses in all the factory fields an improvement of work standards. ····· 1036118561
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The research detailed in this book presents a systematic wear modelling methodology that can be applied to any wear scenario regardless of wearing mode, thereby providing a step-by-step guiding tool to designers for wear experiments and modelling. The major stages of the approach are: tribo-system examination, experimentation, experimental wear coefficient determination and model formation. The book presents a Finite Element Analysis (FEA) based wear modelling algorithm devised in the course of the reported research activity. FEA is used as a tool to calculate nodal pressures at the contact region for small sliding steps. The methodology solicited in this research was implemented to model the wear phenomenon of a polymer-to-polymer dry sliding contact. Model verification was accomplished by comparing the simulated results with the actual test results, which were found in conclusive agreement. ····· 1036118557
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Validation is the subjective process that determines the accuracy with which the mathematical model describes the actual physical phenomenon. This research was conducted in order to validate the use of finite element analysis for springback compensation in 3D scanning of sheet metal objects. The measurement uncertainty analysis was used to compare the digitized 3D model of deformed sheet metal product with the 3D model obtained by simulated deformation. The influence factors onto 3D scanning and numerical simulation processes are identified and analyzed. It is shown that major contribution to measurement uncertainty comes from scanning method and deviations of parts due to manufacturing technology. The analysis results showed that numerical methods, such as finite element method, can successfully be used in computer-aided quality control and automated inspection of manufactured parts. ····· 1036118535
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The main focus of my research was to look at the relationship between seated posture, specifically lower back curvature or lordosis, biofeedback control, and lower back pain. There were initially three main objectives with this project: The first objective was to develop a device that would be capable of measuring and recording the curvature of the lower back. The second main objective of the project was to see if there was any correlation between biofeedback and seated posture. Furthermore, could biofeedback from the device be used to control this posture. The last objective of the project was to determine if controlling seated posture utilizing biofeedback, from the device, had any effect on low back pain. ····· 1036118514· 1 · ::::: · 76 ·· 77 ·· 78 ·· 79 ·· 80 ·· 81 ·· 82 · ::::: · 83 ·
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