The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform
Ye Wang - One of the best experts on this subject based on the ideXlab platform.
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Design of gas turbine flowmeter based on the technology of automatic gain control
2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015Co-Authors: Yusen Li, Ye WangAbstract:The paper proposes a gas turbine flowmeter with adding the technology of automatic gain control (AGC). This design is using MSP430F169 chip. The main function modules and test results of this are given in the paper. This design can solve the disadvantage of signal degradation caused by the external environmental factors when using the gas turbine flowmeter in practical application. This gas turbine flowmeter has advantages of good precision, high Rangeability, little environment influence, good stability and excellent reliability. The output signal can be adjusted according to the strength of the received signal so that it in certain dynamic range is realistic. The experimental results show that the quality of the output signal is improved by applying the technology of automatic gain control to the gas turbine flowmter in practical use.
Yusen Li - One of the best experts on this subject based on the ideXlab platform.
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Design of gas turbine flowmeter based on the technology of automatic gain control
2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015Co-Authors: Yusen Li, Ye WangAbstract:The paper proposes a gas turbine flowmeter with adding the technology of automatic gain control (AGC). This design is using MSP430F169 chip. The main function modules and test results of this are given in the paper. This design can solve the disadvantage of signal degradation caused by the external environmental factors when using the gas turbine flowmeter in practical application. This gas turbine flowmeter has advantages of good precision, high Rangeability, little environment influence, good stability and excellent reliability. The output signal can be adjusted according to the strength of the received signal so that it in certain dynamic range is realistic. The experimental results show that the quality of the output signal is improved by applying the technology of automatic gain control to the gas turbine flowmter in practical use.
J. E. Amadi-echendu - One of the best experts on this subject based on the ideXlab platform.
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Detecting changes in the condition of process instruments
IEEE Transactions on Instrumentation and Measurement, 1994Co-Authors: J. E. Amadi-echenduAbstract:By custom, the output from an instrument is a signal representing a measure of the process variable, and instrument performance is usually specified in terms of accuracy, linearity and Rangeability. The process operator typically uses the specified performance criteria to assess the operational condition of the instrument based on the premise that degradation in performance essentially reflects malfunction on the part of the instrument. Current developments in intelligent measurement systems place emphasis on local sensor validation schemes to incorporate systematic means for detecting and isolating instrument effects from plant effects. This paper describes a method for detecting and isolating changes in a flow-measuring system using wide-band and unconditioned signals taken directly from the flow-sensing element.
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Signal analysis applied to vortex flowmeters
[1992] Conference Record IEEE Instrumentation and Measurement Technology Conference, 1992Co-Authors: J. E. Amadi-echenduAbstract:Vortex flowmeters are applied to the measurement of fluid flows where instruments with no moving parts and with wide Rangeability are required. Process conditions influence the operation of a vortex flowmeter and fluctuations in the flow affect the complex phenomenon of vortex street formation. In the present study the signal taken directly from the sensor employed in an industrial vortex flowmeter is processed so as to discern the effects of various process conditions on the measurement signal. The implication is that signal processing and system identification techniques can be applied to enhance the quality of the measurement information provided to a supervisory control system.
K.s. Mylvaganam - One of the best experts on this subject based on the ideXlab platform.
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Chirp excitation of ultrasonic probes and algorithm for filtering transit times in high-Rangeability gas flow metering
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 1993Co-Authors: T. Folkestad, K.s. MylvaganamAbstract:The signal processing used in an ultrasonic high-Rangeability gas flow meter using times of flight is presented. The flow meter under discussion uses a combination of continuous wave and chirp signals to measure at low flow velocities, below 20 m/s, and chirp signals alone to measure high flow velocities, above 20 m/s. Because of the need for a pulse compression technique in the signal waveform design the technique of pulse compression and the choice of signal waveforms are discussed. The advantages and disadvantages of amplitude weighting vis-a-vis frequency domain manipulations of the waveforms are also discussed. To eliminate spurious times of flight, a special filtering technique is used, based on assessing the gradient of ascendingly ordered time series of time-of-flight measurements. A summary of user experience with high-Rangeability gas flow meters in use on different offshore platforms and in refineries is given. Long-term tests that examined the accuracy of the high-Rangeability flow meter are also described.
Giuseppe Ferrara - One of the best experts on this subject based on the ideXlab platform.
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A Pre-Design Model to Estimate the Effect of Variable Inlet Guide Vanes on the Performance Map of a Centrifugal Compressor for Automotive Applications
SAE Technical Papers, 2017Co-Authors: Michele Becciani, Matteo Checcucci, Luca Marmorini, Alessandro Bianchini, Andrea Arnone, Giuseppe Ferrara, M Di Luca, Lorenzo Ferrari, Giovanni FerraraAbstract:Copyright © 2017 SAE International. The onset of aerodynamic instabilities in proximity of the left margin of the operating curve represents one of the main limitations for centrifugal compressors in turbocharging applications. An anticipated stall/surge onset is indeed particularly detrimental at those high boost pressures that are typical of engine downsizing applications using a turbocharger. Several stabilization techniques have been investigated so far to increase the Rangeability of the compressor without excessively reducing the efficiency. One of the most exploited solutions is represented by the use of upstream axial variable inlet guide vanes (VIGV) to impart a pre-whirl angle to the inlet flow. In the pre-design phase of a new stage or when selecting, for example, an existing unit from an industrial catalogue, it is however not easy to get a prompt estimation of the attended modifications induced by the VIGV on the performance map of the compressor. A simplified model to this end is presented in the study. Figuring out a typical industrial pre-design phase, the model assumes the availability of the original performance data of the compressor without pre-whirl and only very few geometrical parameters. Based on fluid dynamic considerations and some additional models and correlations, a procedure is defined to correct the attended stage pressure ratio and efficiency as a function of the pre-whirl angle imposed by the VIGV. The model has been successfully validated using an experimental literature case study and is thought to represent a new useful preliminary tool for turbocharger designers.
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An academic test rig for industrial centrifugal compressor stages: A design approach
Proceedings of the ASME Turbo Expo, 2016Co-Authors: Alessandro Bianchini, Lorenzo Ferrari, Giuseppe FerraraAbstract:Copyright © 2016 by ASME and Solar Turbines Incorporated. Due to the huge amount of power connected to centrifugal compressors' applications, even small Rangeability increases of the stages would provide significant energy and money savings. In particular, industrial manufacturers pay lot of interest in better understanding the instabilities that in many cases define the minimum flow limit of their stages, but they are often hampered in the research by the short time-To-market. On the other hand, academia has historically found difficulties in approaching the problem due to the lack of dedicated experimental facilities. In this study, the concept design of a new research test rig is presented. The rig will be able to test impellers in field-like conditions (original mass flow and peripheral Mach numbers up to 0.7), operating in open-loop configuration with ambient inlet conditions. In view of systematic test campaigns, a modular design will allow to easily replace any component of the asset and even to modify the flowpath after the impeller, so that the influence of each component can be estimated. As a research academic facility, the rig is characterized by some new design solutions, oriented to minimize the mechanical complexity, the energy consumption, the overall dimensions, and, finally, the cost. Moreover, it will be equipped with advanced experimental measurement instrumentation, e.g. a PIV system or fast response aerodynamic pressure probes. The paper illustrates the conceptual design of the rig, including the selection of the best architecture and layout, the drivetrain assessment and the rotordynamic verification. Computational fluid-dynamic analyses are also presented, aimed at verifying the flow uniformity in the discharge sections and the thermal stability of the system during the tests.
