Modeling and simulation

About: Modeling and simulation is a research topic. Over the lifetime, 10273 publications have been published within this topic receiving 111550 citations.

A new approach to the modeling and simulation of flexible microstructures under the effect of squeeze-film damping

Abstract: We present a new approach to the modeling and simulation of flexible microstructures under the effect of squeeze-film damping. Our approach utilizes the compressible Reynolds equation coupled with the equation governing the plate deflection. The model accounts for the electrostatic forcing of the capacitor airgap, the restoring force of the microplate and the applied in-plane loads. It also accounts for the slip condition of the flow at very low pressures. Perturbation methods are used to derive an analytical expression for the pressure distribution in terms of the structural mode shapes. This expression is substituted into the plate equation, which is solved in turn using a finite-element method for the structural mode shapes, the pressure distributions, the natural frequencies and the quality factors. We apply the new approach to a variety of rectangular and circular plates and present the final expressions for the pressure distributions and quality factors. Our theoretically calculated quality factors are in excellent agreement with available experimental data and hence our methodology can be used to simulate accurately the dynamics of flexible microstructures and predict their quality factors under a wide range of gas pressures. Because the pressure distribution is related analytically to the deflection, the dimension of the coupled structural-fluidic problem and hence the number of global variables needed to describe the dynamics of the system is reduced considerably. Consequently, the new approach can be significant to the development of computationally efficient CAD tools for microelectromechanical systems.

Solid Fuels Combustion and Gasification: Modeling, Simulation, and Equipment Operations

Abstract: Basic Remarks on Modeling and Simulation Solid Fuels Equipment and Processes Basic Calculations Zero-Dimensional Models Introduction to One-Dimensional Steady-State Models Moving-Bed Combustion and Gasification Model Chemical Reactions Heterogeneous Reactions Drying and Devolatilization Auxiliary Equations and Basic Calculations Moving-Bed Simulation Programs and Results Bubbling Fluidized-Bed Combustion and Gasification Model Fluidization Dynamics Auxiliary Parameters Related to Fluidized-Bed Processes Bubbling Fluidized-Bed Simulation Program and Results Circulating Fluidized-Bed Combustion and Gasification Model Circulating Fluidized-Bed Simulation Program and Results Appendices Index

Grand Challenges in Modeling and Simulation of Complex Manufacturing Systems

Abstract: Even though we have moved beyond the Industrial Age and into the Information Age, manufacturing remains an important part of the global economy. There is a need for the pervasive use of modeling and simulation for decision support in current and future manufacturing systems, and several challenges need to be addressed by the simulation community to realize this vision. First, an order of magnitude reduction in problem-solving cycles is needed. The second grand challenge is the development of real-time, simulation-based problem-solving capability. The third grand challenge is the need for true plug-and-play interoperability of simulations and supporting software. Finally, there is the biggest challenge facing modeling and simulation analysts today: that of convincing management to sponsor modeling and simulation projects instead of, or in addition to, more commonly used manufacturing system design and improvement methods such as lean manufacturing and six sigma.