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Showing 1 to 20 of 49 for “"LCO"”.
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An Experimental Study of Synthetic Jet Actuators with Application in Airfoil LCO Control
… phenomenon such as Limit Cycle Oscillations (LCO). One of the biggest challenges involved in the design of UAVs operating in unsteady atmosphere conditions is the susceptibility of the airframe to aeroelastic instabilities, such as flutter or LCO. Suppression of such instabilities can be …
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How small and medium sized enterprises (SMEs) can influence the successfulness of a partnership with a large company (LCO) in the technology innovation sector
… forming a partnership with a large company (LCO). This is because what the SME lacks in terms of market links, marketing and distribution channels, the LCO can often provide. LCOs, on the other hand, need to be innovative in order to survive in a dynamic and ever changing business …
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Robust Nonlinear Estimation and Control Applications using Synthetic Jet Actuators
<p>Limit cycle oscillations (LCO), also known as utter, cause significant challenges in flight control of small unmanned aerial vehicles (SUAVs), and could potentially lead to structural damage and catastrophic failures. LCO can be described as vibrational motions in the rocking, pitching and …
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Robust and Adaptive Nonlinear Control of Limit Cycle Oscillations in UAVs Using Synthetic Jet Actuators
<p>Limit cycle oscillations (LCO), also known as utter, cause significant challenges in fight control of unmanned aerial vehicles (UAVs), and could potentially lead to structural damage and catastrophic failures. LCO can be described as vibrational motions in the pitching and plunging displacements …
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Self-assembly of conformal polymer electrolyte film for lithium ion microbatteries
… the cathode substrate lithium cobalt oxide (LCO) and the polymer separator poly(ethylene oxide). These predictions were first tested qualitatively using hexane and PTFE, which have well-established surface energies, and then by measuring the contact angles of PEO on LCO in hexane and …
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Numerical Study in Wind Energy Extraction from Controlled Limit-Cycle Oscillations in Modified Glauert Airfoil
… aeroelastic limit cycle oscillation (LCO) from which energy may be extracted. Synthetic jet actuators (SJA)s are used along with the unique geometry of the MG airfoil to control flow separation and amplify the LCO and energy generation potential of the system. The discussed wind energy …
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Nonlinear Analysis and Control of Aeroelastic Systems
… may lead to limit cycle oscillations (LCOs) in aeroelastic systems. LCOs can result in fatigue in wings leading to catastrophic failures. Existence of LCOs for velocities less than the linear flutter velocity has been observed during flight and wind tunnel tests, making such subcritical …
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Time Spectral Adjoint Based Design for Flutter and Limit Cycle Oscillation Suppression
… regions of flutter or Limit Cycle Oscillation (LCO). A quick assessment of these dynamic aeroelastic for various design candidates is key to successful design. Flutter based design requires the sensitivity of flutter parameters to be known with the respect of design parameters. Traditionally, …
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Prediction of Limit Cycle Oscillation in an Aeroelastic System using Nonlinear Normal Modes
… understand and model limit cycle oscillation (LCO). The recently developed method of nonlinear normal modes (NNM) is investigated for LCO calculation. Nonlinear normal modes were used to analyze a spring-mass-damper system with nonlinear damping and stiffness to demonstrate the ability and …
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Novel Magnetic Resonance Techniques as Applied to Metallic Phases in Lithium-Ion Battery Electrodes
… LIBs are graphite and lithium cobalt oxide (LCO), with the materials chemistry and battery communities treating them as “model compounds”. Despite this, the electronic properties of these electrodes remain unclear. Graphite is a semimetal which becomes metallic on intercalating lithium (when …
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Nuovi catalizzatori per l'idrogenazione, l'idrogenolisi/ring-opening di composti aromatici policiclici
… fraction of the so-called light cycle oil (LCO). Due to its high aromatics content and its low cetane number (typically between 20 and 30), the incorporation of LCO may have a negative impact on the quality of diesel. Current technologies for LCO improvement are based on hydrogenation to …
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Lithium ion power generator : a novel system for direct thermal to electric energy conversion
… electrode with LiV2Os as a negative electrode (LCO/LVO) could theoretically generate 0.9mvK-1 in the dual-temperature system. Additionally, LCO/LVO cells used in conjunction with LiNio.Mno.1Co0.1O2 used as a positive electrode and LiFePO 4 used as a negative electrode should be able to generate …
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Organic Template-Assisted Synthesis & Characterization of Active Materials for Li-ion Batteries
… currently used for Li-ion batteries are LiCoO2 (LCO) and graphite—the first materials successfully integrated by Sony into Li-ion batteries. However, due to the high cost and polluting effect of cobalt (Co), and the low volumetric capacity of graphite, new materials are being sought out. LiFePO4 …
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Magellan Instant Camera testbed
… is currently used at Las Campanas Observatory (LCO) in La Serena, Chile. It is designed to be both simple and efficient with minimal optics between the telescope port and the detector, a high quantum efficiency and throughput detector, a CryoTiger® self-contained, cooling system that cleanly and …
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Identification of Transient Nonlinear Aeroelastic Phenomena
… could yield flutter or Limit Cycle Oscillations (LCO). The overall goal of this work is to develop the capabilities to quantify the role that these different nonlinear mechanisms could play in observed flutter and LCO. The realization of such a goal would help in providing a benchmark for the …
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Life Cycle Optimization of a Zero Carbon Building for CO2e, Energy, and Cost Using Stochastic Controls for an Energy System Integrating a Heat Pump, Solar Air Wall, PV, and a Smart Grid-integrated Thermal Storage (SGTS) Hydronic Battery
The life cycle optimization (LCO) of zero carbon buildings (ZC) was examined, using a laneway house built with photovoltaic and solar air wall (SAW) renewable energy collection, air-to-water heat pump, smart grid-integrated thermal storage (SGTS) hydronic battery with an internet-connected …
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Aerosol Synthesis of Layered Oxide Cathodes Materials for Lithium-ion Batteries
… cathode materials, including LiCoO<sub>2</sub> (LCO) and LiNi<sub>0.8</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>O<sub>2</sub>, known as NMC811, which is challenging to synthesize. To gain a deeper understanding of LCO synthesis through SP, the study investigated the influence of reactor wall …
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Nonlinear Estimation and Control Methods for Mechanical and Aerospace Systems under Actuator Uncertainty
… flow-induced limit cycle oscillations (LCO) (flutter), vorticity, and acoustic instabilities. Flow control is also important in aircraft applications to reduce drag in aircraft wings for improved flight performance. Although passive flow control approaches are often utilized due to their …
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NMR Studies of Interfacial Reactions in Lithium-Ion Batteries
… (LiMO2, M = Ni, Mn, Co or Al, e.g. LiCoO2, LCO; LiNixMnyCo1-x-yO2, NMC), are investigated by a combination of solution NMR spectroscopy and operando gas measurements. The soluble products formed at LCO electrodes are identified, and reaction mechanisms are proposed to rationalise the …
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Hydrogen Enrichment Effects on Thermoacoustics of Turbulent Partially Premixed Flames
… theory, revealing the presence of period-1 LCO, period-2 LCO, intermittent, quasi-periodic, and chaotic states, as either bulk velocity or equivalence ratio is varied. The unstable acoustic modes and their spatial behaviour are investigated using a reduced-order model. This thesis also …
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