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RISOn the Use of Cost-Effective Valid-Time-Shifting (VTS) Method to Increase Ensemble Size in the GFS Hybrid 4DEnVar System
Publisher: American Meteorological Society
Abstract: AbstractValid-time-shifting (VTS) ensembles, either in the form of full ensemble members (VTSM) or ensemble perturbations (VTSP), were investigated as inexpensive means to increase ensemble size in the NCEP Global Forecast ...
A Nonvariational Consistent Hybrid Ensemble Filter
Publisher: American Meteorological Society
Abstract: consistent hybrid ensemble filter (CHEF) for using hybrid forecast error covariance matrices that linearly combine aspects of both climatological and flow-dependent matrices within a nonvariational ensemble data assimilation ...
Theoretical and Experimental Determination of Proppant Crushing Rate and Fracture Conductivity
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Proppant is an important material for hydraulic fracturing that impacts the production and production cost of oil and gas wells. The key properties of proppant are crushing rate and fracture conductivity. The most common ...
A Methodology for Optimal Design of a Vehicle Suspension System With Energy Regeneration Capability
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper proposes a systematic methodology for predicting and optimizing the performance of an energy regenerative suspension system to efficiently capture the vibratory energy induced by the road irregularities. The ...
Random Vibration of Diamond Beaded Rope Subject to a Concentrated Load
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this work, the random vibration characteristics of a beaded rope under a concentrated load are investigated. A stochastic model describing the sawing force of a single diamondbeaded rope was established, based on the ...
Investigation of the Effects of Anthropogenic Pollution on Typhoon Precipitation and Microphysical Processes Using WRF-Chem
Publisher: American Meteorological Society
Abstract: aking Typhoon Usagi (2013) as an example, this study used the Weather Research and Forecasting Model with Chemistry to investigate the influence of anthropogenic aerosols on typhoons. Three simulations (CTL, CLEAN, EXTREME) ...
The High-Rank Ensemble Transform Kalman Filter
Publisher: American Meteorological Society
Abstract: AbstractThe ensemble Kalman filter is typically implemented either by applying the localization on the background error covariance matrix (B-localization) or by inflating the observation error variances (R-localization). ...
Influence of Current Velocity on Wave-Current Forces on Coastal Bridge Decks with Box Girders
Publisher: American Society of Civil Engineers
Abstract: In this paper, a two-dimensional (2D) model for wave-current girder interactions is established to investigate the effect of wave-current forces on box girder bridges. Reynolds averaged Navier-Stokes (RANS) equations ...
A Simultaneous Multiscale Data Assimilation Using Scale-Dependent Localization in GSI-Based Hybrid 4DEnVar for NCEP FV3-Based GFS
Publisher: American Meteorological Society
Influence of the Friction Block Shape and Installation Angle of High-Speed Train Brakes on Brake Noise
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this study, experiments are conducted to evaluate the effects of friction block shapes and installation angles on the brake noise of high-speed trains on a customized small-scale brake dynamometer. Friction blocks in ...