modeling and simulation for rf propagation
an introduction to network modeling and simulation for the practicing engineer
... Introduction 1.1 Advantages and Disadvantages of Modeling and Simulation 1.2 Comparison of “Homebrew” Models and Simulation Tools 1.3 Common Pitfalls of Modeling and Simulation and Rules of Thumb 1.4 ... OF MODELING AND SIMULATION AND RULES OF THUMB tools/environments so that it can be integrated with and leverage existing simulation libraries 1.3 COMMON PITFALLS OF MODELING AND SIMULATION AND ... BER and PER performance of the wireless link in a given channel This will affect the throughput and delay performance of the wireless link This will influence BER, PER, throughput, and delay performance...
Ngày tải lên: 02/04/2014, 15:49
Modeling and Simulation for Material Selection and Mechanical Design Part 18 pptx
... Meier and Mr T Riehl for performing and evaluating a large number of investigations and testings, Mr W Thomala for valuable discussions, Dr G E Totten, Dr K Funatani, Dr L Xie, and Mr R Johnson for ... Organization for Standardization: ISO 4757: Cross recesses for screws www.iso.ch International Organization for Standardization: ISO 4759: Tolerances for fasteners www.iso.ch International Organization for ... Schwabach for support with photographs and experimental results and finally my family for support with plenty of time during preparing the manuscript REFERENCES Askeland, D.R The Science and Engineering...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 1 ppsx
... Understanding Gear Noise, J Derek Smith 18 Chains for Power Transmission and Material Handling: Design and Applications Handbook,American Chain Association 19 Corrosion and Corrosion Protection Handbook, ... Fundamentals and Testing: Second Edition, Revised and Expanded, Raymond G Bayer Engineering Design for Wear: Second Edition, Revised and Expanded, Raymond G Bayer Clutches and Brakes: Design and Selection, ... numerical modeling and simulation technology, coupling of temperature, inelastic behavior and phase transformation and solidification involved with elastic-plastic, viscoplastic and creep deformation...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 3 ppt
... noted that these models should be widely used for off-line simulation of designing steel compositions and processing condition and on-line simulation for guaranteeing mechanical properties of steels ... GBS formation consists of diffusion of alloying elements and impurities from bulk to interface The migration mechanisms for substitial and interstitial impurities are different The reason for ... very useful for designing cooling facilities and determining cooling conditions for obtaining a more uniform quality product VIII CONCLUSION In this chapter, mathematical models for predicting...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 4 pot
... where F ¼ for grain boundaries and F ¼ for free surface The kinetics of segregation dissolution could be described by these equations (22) and (23) But, in this case, the variables Xb(0) and Xb ... Guttman has expanded the concept for synergistic co-segregation of alloying elements and harmful impurities at the grain boundaries His theory is very important for analysis of steels and alloys ... of I and M: DGI ¼ DG0 þ I bb ba MI b YM À MI Xa Cb Ca M ð19Þ bb ba MI b YI À MI Xa ab aa I ð20Þ DGM ¼ DG0 þ M where Cb and ab are the fractions of sites available in the interface for I and M...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 5 pdf
... stresses and micro-residual stresses [1,2] The macro-type depends on the plastic deformation of solid materials due to rapid non-uniform cooling And, the strain and deformation due to phase transformation ... more perfect designing for metallurgical process In this chapter, the metallo-thermo-mechanical theory, numerical modeling and simulation technology considered with coupling of temperature and phase ... casting, and thermal spray coating as well as forging for the control of residual stress and distortion in these processing This chapter not only presents various simulation methods and results...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 6 pot
... calculated and experimental residual stress on the surface Figure 11 Comparison of residual stresses with and without consideration of transformation plasticity B Residual Stress and Distortion ... as a function of temperature by the methods mentioned below and used for simulation as the surface boundary condition Carbon Diffusion and Distribution Fig 17 shows the changes of carbon content ... elastic–viscoplastic solids and viscous fluids to apply simulation of the casting process was proposed and verified by experimental and numerical results On the other hand, a proposal based on the...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 7 pot
... the theory and numerical method VI DESIGNING OF FORGING PROCESS FOR CONTROL OF INTERFACIAL STRESS A Basic Description A typical industrial metal component may be manufactured by forging and heat ... 375–381 Ju, D.Y.; Inoue, T In Simulation of Solidification and Thermo-mechanical Behavior in Continuous Casting Process, Modeling and Simulation in Metallurgical Engineering and Materials Science; Yu, ... Conference on Physical and Numerical Simulation of Materials and Hot Working (ICPNS’99), 1999; 270–280 Copyright 2004 by Marcel Dekker, Inc All Rights Reserved 4 Modeling and Simulation of Mechanical...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 8 pps
... activation volume For given stress and strain, the value of T lnð_ à =_ Þ is constant for all e e _ temperatures and also for all strain rate values between e0 exp½ÀDG0 = _ ðkTÞ and e0 This means ... shear wave velocity cT and s ¼ avn = À ðv=cT Þ2 Athermal Deformation Processes In the range of intermediate temperatures and low strain rates (combined ranges B and I), and at relatively low ... previous temperature rise and k is the fraction of energy remaining in the deformation zone At low strain rate, there is enough time for heat transfers out of the deformation zone and the temperature...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 9 pptx
... two points of each fiber, and a kink band is observed, which is inclined to the load direction [59–59] Within the kink band, the matrix suffers high cyclic shear deformation, which may cause ... deformed The harder material appears in the mean brighter than the softer one Fourteen cycles later, the mesh and the stress distribution look completely different, as shown in Fig 24c and d for ... is the initiation of an inclined shear band accompanied by a reduction in the specimen deformation resistance, deformation localization in the matrix, and hence a reduction in the fatigue life...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 10 potx
... determined in experiments and by the finite-element simulation With these results, the main reason for crack initiation and growth seems to be the relatively high local strains, and not the local stress, ... uniformly distributed over the whole rod On the other hand, if the rod is impacted, e.g by a hammer at the front surface, the mass inertia forces cannot be neglected The rod front is pushed forward ... tensile forces are needed for the continuation of extension Other specimen regions undergo additional deformation, so that the uniform elongation increases with increasing strain rate sensitivity and...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 11 doc
... friction and wear) and a non-equilibrium, unsteady state, associated with surface damage processes (Fig 2) Surface damage is usually observed in the initial (running-in) and Figure Diagram of wear and ... containing Fe will react with oxygen and carbon at the tool surface and form a boundary layer of both iron carbides and oxides This leads to a built-up edge The formation of a built-up layer can ... accumulation of energy into surfaces and the generation of heat The energy dissipation during friction leads to the accumulation of high plastic strains in the surface layers and the formation of an ultrafine-grained...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 12 docx
... phenomenon for the phases that form on the wear crater surfaces of M2 high-speed steel, DCPM and BNdoped DCPM tools Figure 19a–c show Fourier transforms obtained from data collected from the surface ... high wear resistance and good frictional properties of DCPM tools are associated with complex structural and phase transformations on the surface, among them TiC oxidation and the development ... oxygen-containing secondary phases formed from BN during cutting was also taken into account The possibility that TiC and BN might oxidize and generate thin surface oxide films for exploitation in cutting...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 13 pptx
... ways: (1) by surface engineered and self-lubricated coatings for low and moderate speed machining, and (2) by the use of hard or superhard coatings, that can act as thermal barriers and form very ... used to protect the surface of the hard coating This is one of the most important goals for wear resistant coatings, especially at low and moderate cutting speeds, and for handling hard-to-machine ... the adhesion between the coating and indium-modified surface of the tool was sufficient to ensure a reliable tool performance Indium is a surface-active metal and usually displays a low tribological...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 15 pot
... materials for screw and clamped part (e.g Al-screws for Al-components) and using long thin walled distance tubes (e.g for pipe constructions) Figure 29 proposes a fundamental example for thermal ... loading and unloading by an external axial force Fax influence the relevant elastic resiliences of ds and dp, if the fastening system is loaded Therefore the resiliences vary between tightening and ... operating force of screw (interesting for increasing the fatigue loading capacity of the fastening system), and reduces also the residual clamping force under axial loading with an operating force...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 16 ppsx
... responsible for the selection of screw size For a given screw strength and assembly method, the minimum level is generated for maximum friction coefficient Therefore, in Table 13 for metric screw ... in Fig 36 Between Fc and Ft, one can measure the contact angle E This value is 308 for hexagon and bihexagon drive, 458 for triple square (see also Fig 63) and about 608 for hexalobular drive ... matching of screw and clamped part Large head support diameters da are suitable for low surface contact pressure (see also Figure 39) and for covering large clearance holes Countersunkand ball-section-support...
Ngày tải lên: 10/08/2014, 12:21
Modeling and Simulation for Material Selection and Mechanical Design Part 17 potx
... initial preload for steel screw (light bar) and aluminum screw (dark bar) before and after thermal exposure For case (screw M10), this means 32 kN resp 19 kN before thermal exposure and kN resp kN ... and sort time relaxation Separating preload for given eccentrical loading with axial force Fax Maximum axial force for given preload Fp0, before component separating occurs Additional axial force ... particular application (size and number of rivets, geometry tolerances, and setting parameters) For more information regarding riveting systems, see Ref [59] For standardization of blind rivets,...
Ngày tải lên: 10/08/2014, 12:21
Báo cáo hóa học: " Research Article A Framework for System-Level Modeling and Simulation of Embedded Systems Architectures" ppt
... model layer, and the mapping layer which is an interface between application and architecture models THE SESAME APPROACH The Sesame modeling and simulation environment facilitates performance analysis ... Architectures, Modeling, and Simulation, S Bhattacharyya, E Deprettere, and J Teich, Eds., pp 85–105, Springer, Berlin, Germany, 2003 [22] A D Pimentel, “The artemis workbench for system-level performance ... platforms: a disciplined approach,” IEEE Design and Test of Computers, vol 19, no 6, pp 6–16, 2002 [24] S Mohanty and V K Prasanna, “Rapid system-level performance evaluation and optimization for...
Ngày tải lên: 22/06/2014, 19:20
Variational methods for modeling and simulation of tool tissue interaction
... tensor–mass method for fast computation of nonlinear viscoelastic mechanical forces and deformations for the simulation of biological soft tissues with the aim of developing a simulation tool for the planning ... Fung [68], was used for characterization of the material parameters Davies [75] performed large and small probe indentation experiments on un-perfused and perfused pig spleen for potential use ... problem Variational based modeling methods have many applications in soft tissue deformation modeling Realistic and efficient modeling and animation of skin for both humans and animals requires attention...
Ngày tải lên: 09/09/2015, 11:30
Characterization and modeling of MOSFETS for RF applications
... Challenges in MOSFET modeling for RF IC design The success of RF design depends heavily on the accuracy of circuit simulation tools This requires efficient and compact models for the active and passive ... for device simulations 140 C.1 Initial mesh and zero carrier solution 140 C.2 Two-carrier solutions to build up gate bias 141 C.3 Building the drain bias and performing RF ... three-port capacitances, for the first time and discusses its implications towards RF MOSFET modeling and circuit simulation vii List of Figures Figure On-wafer termination for two-port S-parameter...
Ngày tải lên: 03/10/2015, 20:31