Fuzzy clustering model is an essential tool to find the proper cluster structure of given data sets in pattern and image classification. In this paper, a new weighted fuzzy C-Means (NW-FCM) algorithm proposed improve performance both FCM FWCM models for high-dimensional multiclass recognition problems. The methodology used NW-FCM concept mean from nonparametric feature extraction (NWFE) discriminant analysis (DAFE). These two concepts are combined unsupervised clustering. main features...

Lithium-ion batteries (LIBs) are expected to play a crucial role in meeting many of the clean energy-related goals. Due its electrical properties such as good conductance, chemical inertness, and corrosion resistance, graphite is very popular anode for LIBs. Traditional methods producing battery-grade (high purity >99%) include processing naturally mined or manufacturing synthetic via Acheson process, which converts soft amorphous carbons petroleum coke into by subjecting it high temperature...

The National Airspace System (NAS) is an important and a vast resource. Efficient management of airspace capacity to ensure safe systematic operation the NAS eventually resulting in maximum benefit stakeholders. Dynamic Configuration (DAC) one NextGen Concept Operations (ConOps) that aims at efficient allocation as technique. This paper proof concept for Approximate Programming (ADP) approach by static sectorization. objective this address issue sectorization partitioning based on controller...

Abstract Permanent magnets are expected to play a crucial role in the realization of clean economy. In particular, neodymium–iron–boron (Nd2Fe14B or NdFeB) magnets, which have highest energy density among rare earth permanent needed for building more efficient windmill generators, electric vehicle motors, etc. Currently, near-net shape can be either made through sintering and compression molding with extensive post machining directly injection molding. However, has loading volume fraction...

Life cycle assessment (LCA) is a widely recognized tool used to evaluate the environmental impacts of product or process, based on inventory database and bills material. Data quality one most significant factors affecting analysis results. However, currently, datasets in databases are generic, i.e., they may represent material energy flow process at market average, instead specific by manufacturer. As result, stockholders unable track their supply chain find out actual impact from each...

Centrifugal compressors are compatible with the low exit corrected flows found in high pressure compressor of turboshaft engines and may play an increasing role turbofan as engine overall ratios increase. stages difficult to model accurately RANS CFD solvers. A computational study CC3 centrifugal impeller its vaneless diffuser configuration was undertaken part effort understand potential causes mis-prediction these types geometries. Three steady, periodic cases were modeled using TURBO...

NASA’s Environmentally Responsible Aviation (ERA) Program calls for investigation of the technology barriers associated with improved fuel efficiency large gas turbine engines. Under ERA, highly loaded core compressor program attempts to realize burn reduction goal by increasing overall pressure ratio increase thermal engine. Study engines 60 70 are now being investigated. This means that high would have almost double in while keeping a level efficiency. NASA and GE teamed address this...

This paper describes a collaborative and cost-shared approach to reducing fuel burn under the NASA Environmentally Responsible Aviation project. General Electric (GE) are working together aa an integrated team obtain compressor aerodynamic data that is mutually beneficial both GE Aviation. The objective of High OPR Compressor Task test single stage then two stages advanced core using state-of-the-art research instrumentation investigate loss mechanisms interaction effects embedded transonic...

Abstract In the drive for lower fuel consumption through increased bypass ratio and overall pressure (OPR), engine designs next generation of single-aisle aircraft will require core sizes below 3 lb/s OPRs above 50. Traditionally, these are domain centrifugal compressors, but materials limit in machines to well An all-axial high-pressure compressor (HPC) at this size, however, comes with limitations associated small blade spans back HPC, as clearances, fillets, leading edges do not scale...

On the basis of weather and high traffic, Next Generation Air Transportation System envisions an airspace that is adaptable, flexible, controller friendly, dynamic. Sector geometries, developed with average traffic patterns, have remained structurally static occasional changes in geometry due to limited forming sectors. Dynamic configuration aims at migrating from a rigid more flexible structure. Efficient management capacity important ensure safe systematic operation U.S. National Airspace...

NASA and GE teamed to design build a 57% engine scaled fan stage for Mach 4 variable cycle turbofan/ramjet access space with multipoint operations. This was tested in NASA’s transonic compressor facility. The objectives of this test were assess the aerodynamic aero mechanic performance operability characteristics over entire range operation including: 1) sea level static take-off; 2) transition large swings bypass ratio; 3) from turbofan ramjet; 4) wind-milling at high flight conditions....

In this paper the fabrication and characterization of a novel wireless pressure sensor system that can monitor report real-time changes in on rotor blade low speed axial compressor is demonstrated. The was positioned second-stage at approximately mid-span location surface near leading edge hard wired to circuit box located center line drum. output converted from voltage frequency transmitted wirelessly via circularly polarized antenna stationary 1 meter away, mounted centerline inlet cart....

Abstract Thermoplastics are gaining interest for various industrial applications, since they can be widely used thermoforming and injection moulding processes due to their thermostable material behavior. In combination with the material's low density high strength mass ratio, especially of in times where an improved environmental balance is more important. Hence, why example frequently automotive industry reduce weight components. Semi‐crystalline polymers as a subcategory thermoplastics,...

The preliminary design of multistage axial compressors in gas turbine engines is typically accomplished with mean-line methods. These methods, which rely on empirical correlations, estimate compressor performance well near the point, but may become less reliable off-design. For land-based applications engines, off-design estimates are becoming increasingly important, as plant operators desire peaking or load-following capabilities and hot-day operability. current work develops a...

Smart Grid and Internet of Things (IoT) are the latest trends respectively in domains Power Engineering Computer Science. The amalgamation two presents enormous potential to improve efficiency, security reliability power grid. In this paper, authors review existing solutions propose their ideas, as an improvement over techniques realise idea a competitive Energy market by application Mathematical Statistical tools analyse predict load demand well agent behaviour present scenario.

Abstract In the drive for lower fuel consumption through increased bypass ratio and overall pressure (OPR), engine designs next generation of single-aisle aircraft will require core sizes below 3 lb/s OPRs above 50. Traditionally, these are domain centrifugal compressors, but materials limit in machines to well An all-axial high compressor (HPC) at this size, however, comes with limitations associated small blade spans back HPC, as clearances, fillets leading edges do not scale size. The...

New rotor blades are to be fabricated for the 24 foot diameter, 3-stage axial compressor which provides airflow in 11- by 11-Foot Transonic Wind Tunnel Facility at NASA Ames Research Center Moffett Field, California. This presents an opportunity increase peak Mach number capability of tunnel redesigning increased pressure ratio. Simulations existing from APNASA CFD code were compared performance predictions HT0300 turbomachinery design and data taken during a 1997 facility checkout test. It...

Abstract Advancements in core compressor technologies are necessary for next generation, high Overall Pressure Ratio (OPR) turbofan engines. High pressure compressors (HPCs) future engines being designed with exit corrected mass flow rates less than 2.25 kg/s (5 lbm/s). In order to accurately measure the performance of these advanced designs, accuracy measurements needed test facilities. The W7 Speed Multistage Axial Compressor Facility at NASA Glenn Research Center has been used acquire...

NdFeB magnets are critical to many clean energy applications, such as electric vehicles and wind turbines. However, rare earth elements (REEs) used in carry considerable environmental burdens (including carbon footprint) due direct emissions intensive chemical consumption all major process steps. This study conducts a dynamic LCA (DLCA) with focus on footprint considering ore grade decline, best available (control) technology (BAT/BACT), recycling rate, RE type/origin/processing pathways....