Results 1 - 10 of 1577
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[en] The aim of this work is the analysis of the metrological model of the reactivity meter in the form of the dispersion equation, connecting the dispersion of input and output signals of the reactivity meter with imposing random noise on the input. It has been proposed to standardize the form of the equation for the reactivity meter, presenting the main computing unit of the reactivity meter as equation convolution
[ru]Целью работы является вывод и анализ метрологической модели реактиметра в форме дисперсионного уравнения, связывающего дисперсии входного и выходного сигналов реактиметра при наложении случайных шумов на входе. Предлагается стандартизовать форму уравнения реактиметра, представив основной вычислительный блок уравнением свертки
[en] For the Precision Laser Inclinometer (PLI) using the I-20A oil, a high-frequency 4-Hz boundary was determined for reliable detection of the Earth surface angular vibrations. The proposed method makes use of the microseismic signal and its processing to expand the PLI working interval for signal reception and allows one to record the narrow frequency-band signals originated by the Earth surface angular oscillations caused by industrial sources.
[ru]Для прецизионного лазерного инклинометра (ПЛИ) с использованием масла И-20А определена высокочастотная граница 4 Гц надежного детектирования угловых колебаний поверхности Земли. Разработанная методика обработки микросейсмических сигналов расширила рабочий диапазон приема ПЛИ и позволила зарегистрировать узкополосные сигналы угловых колебаний поверхности Земли индустриального происхождения.
[en] Local measurements methods in bubbly flows are discussed. Concerning liquid velocity measurement, problems linked to HFA and LDA are first analysed. Then simultaneously recorded velocity signals obtained by both anemometers are compared. New signal processing are developed for the two techniques. Bubble sizes and velocities measurements methods using intrusive double optical sensor probe are presented. Plane bubbly mixing layer has been investigated. Local measurements using the described methods are presented as examples. (author)
[en] This power point presentation described a virtual power plant simulation study conducted by American Electric Power (AEP), a utility with over 5.4 million customers. The simulation study was conducted in order to enable the installation of smart meters as well as to ensure remote monitoring and control of distribution line devices and energy resources. The simulation study assessed the functionality and performance of a fully integrated smart grid using real system and device information and data. The simulations were also used to optimize power costs and plant efficiency. Energy resources simulated in the study included battery installations, photovoltaic (PV) systems, natural gas-fired reciprocating engines, hybrid electric vehicles, community energy storage systems, and wind turbines. The study also assessed the regional market structure. The impacts of various protocols and standards were assessed in order to determine control system requirement and evaluate constraints and energy efficiency targets. The simulation included regional power system, station transformers, and distribution circuit breakers. Various automation schemes were considered, as well as an integrated VAR control concept. Community energy storage unit specifications were also discussed. tabs., figs.
[en] Various methods of measuring the increment in the free volume of composite components are considered, so as to assess which is most suitable for automation of such measurements as a function of the pressure within the component. A method permitting such measurements with high precision is found, and the corresponding instrument is described.
[en] Time-of-flight ultrasonic flowmeters have been widely used these days in industry. It is however in suspicion if its high accuracy is traceable to the national standard. It was made clear why traceability cannot be guaranteed from a fluid mechanical point of view. The main reason is a difference of flow configuration between the flow standard and the measurement position on-site. The concept of 'Facility Factor' is introduced and it is concluded that the 'Profile Factor' is not sufficient for correcting the meter reading. It is discussed that measurement of velocity profile on-site is essentially required. (author)
[en] The dynamics of reactor instrumentation can be tested during steady-state at-power operation in a non-intrusive way by applying signal noise analysis techniques. This inspection technology can be applied in in-situ, on-line testing, without removing the instrumentation from the process. Reactor noise analysis is a statistical technique regularly used in system surveillance, diagnostics and in actual operational I and C problems. Information on the dynamics of reactor systems and their instrumentation can be extracted from signal fluctuations (noise) measured during steady-state operation. The present paper discusses specific results related to the dynamics and the response time of pressure, flow and temperature transmitters used in the primary heat transport and moderator systems. The signal noise analysis applications included the following areas: (1) estimating the response times of flow, pressure, differential pressure transmitters, RTDs, and validating their dynamics, (2) estimating the resonance frequencies and the time constants of pressure sensing lines, (3) validating coolant flow dynamics in SDS and FINCH flow channels, and (4) characterizing the root cause of flow anomalies, such as 'signal dips' and oscillations found in orifice-based reactor coolant inlet flow signals. Certain flow signals exhibit large, negative, aperiodic flow-signal transients, called 'flow dips'. The signal transients are random in occurrence. Their width is less than 100 msec, and their amplitude could be as big as 10% of full flow. (author)
[en] This paper describes an apparatus for calibrating flowmeters. The principle of operation is to measure the time (T) to fill a predetermined volume (V) and obtain the flow rate (Q) as Q=V/T. The results of the error analysis for the maximum and minimum flowrates tested are presented
[en] In this study, a new concept of a flow sensor is developed using Dielectric Barrier Discharge (DBD). Current of DBD generated between two electrodes is changed with varying flow rates. Therefore, it is possible to measure the flow rate by correlating generated DBD current with flow rates. The effects of flow rate, frequency, channel height, diameter of electrodes and distance between electrodes on the performance of the flow sensor using DBD are experimentally investigated
[en] The effect of voltage on flow rate within cone jet mode electrospraying has been investigated, with particular emphasis on the effect of emitter geometry. A set of experiments investigated the effect of the outer and inner diameters on the flow rate relationship to voltage, in cone jet mode electrospray. This was accomplished by the use of a high fidelity flow meter, capable of measuring changes in flow rate to a fraction of a nanolitre per second. It has been previously demonstrated that there are two separate parameters that influence the flow rate sensitivity to voltage; the hydraulic resistance of the flow system, and the outer diameter of the emitter. By a simple derivation, the second of these two is explained by the variation of theoretical electric pressure with voltage, as the outer diameter is varied. Good agreement is found between experimental and theoretical results, suggesting the simple theory reasonably explains the physics of the situation. As well as elucidating the physics involved in electrospray-suggesting the electric field is an important controlling parameter within cone jet mode electrospray-the theoretical and experimental agreement has important implications for variable throttling of thrust in colloid thrusters, and could bring about better optimization of performance in other electrospray-employing fields.