Current Issue : January - March Volume : 2016 Issue Number : 1 Articles : 5 Articles
Mass collaborative product development (MCPD) benefits people by high innovation products with lower cost and shorter lead\ntime due to quick development of group innovation, Internet-based customization, and pro to type manufacturing. Simulation is an\neffective way to study the evolution process and therefore to guarantee the success of MCPD. In this paper, an agent behavior-based\nsimulation approach of MCPD is developed, which models the MCPD process as the interactive process of design agents and the\nenvironment objects based on Complex Adaptive System (CAS) theory. Next, the structure model of design agent is proposed, and\nthe modification and collaboration behaviors are described. Third, the agent behavior-based simulation flow of MCPD is designed.\nAt last, simulation experiments are carried out based on an engineering case of mobile phone design. The experiment results show\nthe following: (1) the community scale has significant influence on MCPD process; (2) the simulation process can explicitly represent\nthe modification and collaboration behaviors of design agents; (3) the community evolution process can be observed and analyzed\ndynamically based on simulation data....
Measured propagation loss for capacitive body-coupled communication (BCC) channel (1MHz to 60MHz) is limitedly available\nin the literature for distances longer than 50 cm. This is either because of experimental complexity to isolate the earth-ground or\ndesign complexity in realizing a reliable communication link to assess the performance limitations of capacitive BCC channel.\nTherefore, an alternate efficient full-wave electromagnetic (EM) simulation approach is presented to realistically analyze capacitive\nBCC, that is, the interaction of capacitive coupler, the human body, and the environment all together. The presented simulation\napproach is first evaluated for numerical/human body variation uncertainties and then validated with measurement results from\nliterature, followed by the analysis of capacitive BCC channel for twenty different scenarios. The simulation results show that\nthe vertical coupler configuration is less susceptible to physiological variations of underlying tissues compared to the horizontal\ncoupler configuration.The propagation loss is less for arm positions when they are not touching the torso region irrespective of the\ncommunication distance.The propagation loss has also been explained for complex scenarios formed by the ground-plane and the\nmaterial structures (metals or dielectrics) with the human body. The estimated propagation loss has been used to investigate the\nlink-budget requirement for designing capacitive BCC system in CMOS sub-micron technologies....
In this paper we analyze the model that describes the evaporation process of multi-size\n(polydisperse) of fuel droplets in a laminar boundary layer flow. The spray is described\nusing a probability density function and is based on the well-known sectional\napproach. The spray is described in two dimensional boundary layer directions that\nconsists of five equations: the continuity equation, the momentum equation, the\nenergy equation, the equation of state and the spray equation. The governing equations\nare a system of nonlinear partial differential equations (PDE). In order to convert\nthe PDE to ordinary differential equations, we applied the Lees-Dorodnitsyn similarity\ntransformation and the corresponding similar solution based on the compressible\nstream function. We then solve the model numerically and compare our results to the\nsectional approach with an experimental data....
Numerical simulations and analysis of ballistic impact and penetration by tungsten alloy rods into composite targets consisting\nof layers of aluminum nitride ceramic tile(s), polymer laminae, and aluminum backing are conducted over a range of impact\nvelocities on the order of 1.0 to 1.2 km/s. Computational results for ballistic efficiency are compared with experimental data fromthe\nliterature. Simulations and experiments both demonstrate a trend of decreasing ballistic efficiency with increasing impact velocity.\nPredicted absolute residual penetration depths often exceed corresponding experimental values. The closest agreement between\nmodel and experiment is obtained when polymer interfaces are not explicitly represented in the numerical calculations, suggesting\nthat the current model representation of such interfaces may be overly compliant.The present results emphasize the importance of\nproper resolution of geometry and constitutive properties of thin layers and interfaces between structural constituents for accurate\nnumerical evaluation of performance of modern composite protection systems....
This paper presents the modeling and simulation of offshore wind power platform for oil and gas companies. Wind energy has\nbecome the fastest growing renewable energy in the world and major gains in terms of energy generation are achievable when\nturbines are moved offshore.The objective of this project is to propose new design of an offshore wind power platform. Offshore\nwind turbine (OWT) is composed of three main structures comprising the rotor/blades, the tower nacelle, and the supporting\nstructure. The modeling analysis was focused on the nacelle and supporting structure. The completed final design was analyzed\nusing finite element modeling tool ANSYS to obtain the structure�s response towards loading conditions and to ensure it complies\nwith guidelines laid out by classification authority Det Norske Veritas. As a result, a new model of the offshore wind power platform\nfor 5MW Baseline NREL turbine was proposed....
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