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The recent implementation of wear models in the nonlinear solver LS-Dyna allows its use in the numerical simulation of Rotor-Stator Interaction for the very first time. The new capabilities of the solver are studied and are compared to the ones of nonlinear solver Metafor, already capable of simulating Rotor-Stator Interaction. Specifically, the feasibility of such simulations is studied, the best suited contact algorithms are selected, and the performance is assessed. To that end, two LS-Dyna models are developed: a basic ONERA test bench whose purpose is to select the most adequate contact models, and a compressor blade rub test whose purpose is to ensure the correct application of wear on the finite elements model. The choice of contact model is constrained by the limited support of wear in the solver. Penalty methods for contact were considered, double-pass algorithms were rejected due to high variation of contact loads, leaving single-pass algorithms. The penalty computation was selected to ensure the least dependence on the mesh. Soft constraint formulation is not fully independent of the mesh, but offers nodal mass normalization. The specificity of wear computation in LS-Dyna is its application in post-processing only, preventing wear affecting the compressor blade dynamics. The simulation of Rotor-Stator Interaction in LS-Dyna thus necessitates extensive use of computation stops and restarts. A fully functional method to compute Rotor-Stator Interaction was successfully developed for LS-Dyna, with performance similar to Metafor.

metafor --- ls-dyna --- dyna --- interaction --- rotor --- stator --- compressor --- wear --- contact --- divergence --- vibration --- safran --- aero --- boosters --- booster --- engine --- low --- pressure --- onera --- model --- finite --- elements --- nonlinear --- explicit --- implicit --- time --- integration --- solver --- gap --- close --- open --- abradable --- material --- Ingénierie, informatique & technologie > Ingénierie aérospatiale

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A fascinating journey through the origins of American tourismIn the early nineteenth century, thanks to a booming transportation industry, Americans began to journey away from home simply for the sake of traveling, giving rise to a new cultural phenomenon —the tourist.In Selling the Sights, Will B. Mackintosh describes the origins and cultural significance of this new type of traveler and the moment in time when the emerging American market economy began to reshape the availability of geographical knowledge, the material conditions of travel, and the variety of destinations that sought to profit from visitors with money to spend. Entrepreneurs began to transform the critical steps of travel—deciding where to go and how to get there—into commodities that could be produced in volume and sold to a marketplace of consumers. The identities of Americans prosperous enough to afford such commodities were fundamentally changed as they came to define themselves through the consumption of experiences.Mackintosh ultimately demonstrates that the cultural values and market forces surrounding tourism in the early nineteenth century continue to shape our experience of travel to this day.

Popular culture --- Travelers --- Tourists --- Tourism --- History --- History --- Social aspects --- History --- University of South Alabama --- United States. --- book history. --- boosters. --- capitalism. --- caricatures. --- commodification. --- commodified experience. --- destinations. --- entrepreneurs. --- geographical knowledge. --- guidebooks. --- leisure. --- market economy. --- mutually constituted. --- observation. --- picturesque. --- satirists. --- scientific publication. --- tickets. --- tourism. --- tourist industry. --- transatlantic. --- transportation. --- travel. --- traveler. --- travelers.

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In this new book, we present a collection of the advanced developments in reconfigurable antennas and metasurfaces. It begins with a review of reconfigurability technologies, and proceeds to the presentation of a series of reconfigurable antennas, UWB MIMO antennas and reconfigurable arrays. Then, reconfigurable metasurfaces are introduced and the latest advances are presented and discussed.

Technology: general issues --- History of engineering & technology --- Energy industries & utilities --- reconfigurable antenna --- smartphone --- slot antenna --- sub-6G --- band rejected --- envelope correlation co-efficient --- four element MIMO --- polarization diversity --- ultra-wideband multiple input multiple output --- antenna array --- aperiodic array --- full wave analysis --- particle swarm optimization --- reconfigurable antenna arrays --- solid state switches --- RF switching --- magnetic particles --- magnetostatic responsive structures (MRSs) --- wideband reconfigurable antennas --- new feeding techniques --- dual polarization --- multifrequency antennas --- supershape --- reconfigurable antennas --- surface wave array antenna --- metasurface ground plane --- low-profile --- square-ring antennas --- van Atta reflector --- RCS reduction --- structural mode scattering --- metasurfaces --- polarization reconfigurability --- leaky waves --- combo-reconfigurable --- frequency and radiation pattern --- 5G --- millimeter waves --- mobile communication --- flexible antennas --- frequency reconfigurable --- microfluidic antennas --- pattern reconfigurable --- polarization reconfigurable --- wearable antennas --- active FSS --- C-band --- frequency-selective surface (FSS) --- spatial filters --- switchable --- X-band --- smart devices --- antenna boosters --- multiband antennas --- small antennas --- wireless devices --- matching networks --- digitally tunable capacitors --- n/a

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In this new book, we present a collection of the advanced developments in reconfigurable antennas and metasurfaces. It begins with a review of reconfigurability technologies, and proceeds to the presentation of a series of reconfigurable antennas, UWB MIMO antennas and reconfigurable arrays. Then, reconfigurable metasurfaces are introduced and the latest advances are presented and discussed.

Technology: general issues --- History of engineering & technology --- Energy industries & utilities --- reconfigurable antenna --- smartphone --- slot antenna --- sub-6G --- band rejected --- envelope correlation co-efficient --- four element MIMO --- polarization diversity --- ultra-wideband multiple input multiple output --- antenna array --- aperiodic array --- full wave analysis --- particle swarm optimization --- reconfigurable antenna arrays --- solid state switches --- RF switching --- magnetic particles --- magnetostatic responsive structures (MRSs) --- wideband reconfigurable antennas --- new feeding techniques --- dual polarization --- multifrequency antennas --- supershape --- reconfigurable antennas --- surface wave array antenna --- metasurface ground plane --- low-profile --- square-ring antennas --- van Atta reflector --- RCS reduction --- structural mode scattering --- metasurfaces --- polarization reconfigurability --- leaky waves --- combo-reconfigurable --- frequency and radiation pattern --- 5G --- millimeter waves --- mobile communication --- flexible antennas --- frequency reconfigurable --- microfluidic antennas --- pattern reconfigurable --- polarization reconfigurable --- wearable antennas --- active FSS --- C-band --- frequency-selective surface (FSS) --- spatial filters --- switchable --- X-band --- smart devices --- antenna boosters --- multiband antennas --- small antennas --- wireless devices --- matching networks --- digitally tunable capacitors --- reconfigurable antenna --- smartphone --- slot antenna --- sub-6G --- band rejected --- envelope correlation co-efficient --- four element MIMO --- polarization diversity --- ultra-wideband multiple input multiple output --- antenna array --- aperiodic array --- full wave analysis --- particle swarm optimization --- reconfigurable antenna arrays --- solid state switches --- RF switching --- magnetic particles --- magnetostatic responsive structures (MRSs) --- wideband reconfigurable antennas --- new feeding techniques --- dual polarization --- multifrequency antennas --- supershape --- reconfigurable antennas --- surface wave array antenna --- metasurface ground plane --- low-profile --- square-ring antennas --- van Atta reflector --- RCS reduction --- structural mode scattering --- metasurfaces --- polarization reconfigurability --- leaky waves --- combo-reconfigurable --- frequency and radiation pattern --- 5G --- millimeter waves --- mobile communication --- flexible antennas --- frequency reconfigurable --- microfluidic antennas --- pattern reconfigurable --- polarization reconfigurable --- wearable antennas --- active FSS --- C-band --- frequency-selective surface (FSS) --- spatial filters --- switchable --- X-band --- smart devices --- antenna boosters --- multiband antennas --- small antennas --- wireless devices --- matching networks --- digitally tunable capacitors