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公开(公告)号：US20220206067A1
公开(公告)日：2022-06-30
申请号：US17134806
申请日：2020-12-28
发明人： Jerry E. Stevens , Hao Zhu , Marcel Braun
IPC分类号： G01R31/319 , G01R31/28
摘要： A method for testing a device under test, the device under test being a measuring instrument to measure a physical parameter of a fluid, includes: performing a plurality of valid test runs, wherein a valid test run includes: exposing the device under test and a reference measuring instrument to the fluid under a set of influences, the set of influences being defined by influence parameters; monitoring the influence parameters; obtaining a reference value for the physical parameter from the reference measuring instrument; and obtaining a test value for the physical parameter from the device under test, wherein a test run is invalidated if influence parameters do not meet specified test requirements for the influence parameters; and then evaluating a plurality of test values originating from the plurality of valid test runs with respect to at least one of accuracy, repeatability and reproducibility.
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公开(公告)号：US20210404850A1
公开(公告)日：2021-12-30
申请号：US17288965
申请日：2019-09-18
发明人： Hao Zhu
摘要： A method for correcting a measured value of a measured variable with reference to a medium flowing through at least two measuring tubes, wherein each measuring tube is excited by an oscillation exciter to execute oscillations, and wherein the oscillations of each measuring tube are registered by oscillation sensors, wherein an electronic circuit monitors at least two of the following measured variables or, in each case, a measured variable derived therefrom: phase difference between measurement signals, resonant frequency, ratio of an oscillation exciter electrical current amplitude to a measuring tube oscillation amplitude, the method including: determining a plausibility; and, wherein upon failing a plausibility requirement of at least one of the measured variables, determining measured values of the measured variables of at least one, first/second measuring tube as a function of corresponding measured values of the measured variables of at least one, second/first measurement tube.
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公开(公告)号：US11073416B2
公开(公告)日：2021-07-27
申请号：US15794279
申请日：2017-10-26
发明人： Wolfgang Drahm , Hao Zhu , Alfred Rieder , Michael Wiesmann , Patrick Oudoire
摘要： A measuring system comprises: a measuring transducer; transmitter electronics; at least one measuring tube; and at least one oscillation exciter. The transmitter electronics delivers a driver signal for the at least one oscillation exciter, and for feeding electrical, excitation power into the at least one oscillation exciter. The driver signal, has a sinusoidal signal component which corresponds to an instantaneous eigenfrequency, and in which the at least one measuring tube can execute, or executes, eigenoscillations about a resting position. The eigenoscillations have an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode. The driver signal has, a sinusoidal signal component with a signal frequency, which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of the at least one measuring tube, in each case, by more than 1 Hz and/or by more than 1% of said eigenfrequency.
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公开(公告)号：US20210223080A1
公开(公告)日：2021-07-22
申请号：US17055853
申请日：2019-04-17
发明人： Hao Zhu , Alfred Rieder , Yaoying Lin , Robert Lalla , Reinhard Huber
摘要： A measuring device for determining density, mass flow rate and/or viscosity of a flowable medium includes: an oscillator including at least one oscillatable measuring tube for conveying the medium, and having at least one oscillatory mode, whose eigenfrequency depends on density of the medium; an exciter for exciting the oscillatory mode; at least one oscillation sensor for registering oscillations of the oscillator; and an operating-evaluating circuit, which is adapted to supply the exciter with an excitation signal, to register signals of the oscillation sensor, based on the signals of the oscillation sensor to ascertain current values of the eigenfrequency of the oscillator as well as variations of the eigenfrequency, and to determine a value characterizing density variations of the medium, wherein the value depends on a function, which is proportional to the variation of the eigenfrequency and has an eigenfrequency dependent normalization.
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公开(公告)号：US11002580B2
公开(公告)日：2021-05-11
申请号：US16063780
申请日：2016-11-17
发明人： Hao Zhu , Alfred Rieder
摘要： A method for ascertaining a physical parameter of a liquid containing gas in the form of suspended bubbles by means of a measuring transducer with an excitable measuring tube serving for guiding the liquid in bending oscillation modes of various eigenfrequencies, includes steps as follows: ascertaining the eigenfrequencies of the f1-mode and the f3-mode; ascertaining preliminary density values for the gas-containing liquid guided in the measuring tube based on the eigenfrequencies of the f1-mode and the f3-mode; ascertaining a value for the velocity of sound of the gas-containing liquid guided in the measuring tube, and/or ascertaining, as a function of the velocity of sound and the eigenfrequency of a mode, at least one correction term and/or density error for the preliminary density value, which was ascertained based on the eigenfrequency of the mode, for determining a corrected density measured value; and/or a correction term for a preliminary mass flow value for determining a corrected mass flow measured value based on the first preliminary density value, the second preliminary density value, the eigenfrequency of the f1-mode and the eigenfrequency of the f3-mode.
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公开(公告)号：US20210123845A1
公开(公告)日：2021-04-29
申请号：US16956573
申请日：2018-11-15
发明人： Hao Zhu , Alfred Rieder , Bitto Ennio , Gerhard Eckert
摘要： A measuring transducer includes a tube arrangement having a bent tube, an equally embodied tube, a bent tube and a tube embodied equally to the tube, and two flow dividers each having four flow openings. The measuring transducer includes an exciter for exciting and maintaining mechanical oscillations of the tube arrangement and a sensor for registering mechanical oscillations of the tube arrangement and for producing oscillation measuring signals. Each tube is connected to each flow divider to form four parallel flow paths, having a straight segment connected with the flow divider, an arc shaped segment following such straight segment, a straight segment following such arc shaped segment, an arc shaped segment following such straight segment, a straight segment following such arc shaped segment, an arc shaped segment following such straight segment, and a straight segment following such arc shaped segment and is connected with the flow divider.
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公开(公告)号：US10591335B2
公开(公告)日：2020-03-17
申请号：US15537904
申请日：2015-11-18
发明人： Hao Zhu , Alfred Rieder , Ennio Bitto
摘要： A Coriolis mass flow measuring device and/or density measuring device includes two bent measuring tubes, which extend mirror symmetrically to a first mirror plane between the measuring tubes, an actuator arrangement and at least one sensor arrangement. At the inlet end and at the outlet end, a collector, with which the measuring tubes are joined, wherein the collectors each fulfill the functionality of a node plate. A support body, which connects the collectors rigidly with one another; and inlet end and outlet end, in each case, at least one plate-shaped coupler, which connect the measuring tubes pairwise with one another, in order to form an oscillator. The couplers have tube openings for measuring tubes, wherein the measuring tubes are connected at least sectionally with the couplers, wherein inlet end and outlet end, in each case, at least one coupler has, between the measuring tubes, a tuning opening for influencing the oscillation characteristics of the oscillator.
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公开(公告)号：US10408652B2
公开(公告)日：2019-09-10
申请号：US15540048
申请日：2015-11-18
发明人： Hao Zhu , Alfred Rieder
摘要： A Coriolis mass flow measuring device includes four bent measuring tubes, two exciter mechanisms, and two sensor arrangements. All four measuring tubes are joined inlet end and outlet end with collectors, where the measuring tubes are connected inlet end and outlet end pairwise with node plates to form oscillators, where the exciter mechanisms are adapted to excite bending oscillation working modes between the two measuring tubes of an oscillator, where the first oscillator and the second oscillator have bending oscillation working modes with first and second working mode eigenfrequencies (f11, f12), where the magnitude of the difference of the working mode eigenfrequencies of the two oscillators (|f11−f12|) amounts to at least 0.1 times, for example, at least 0.2 times and especially at least 0.4 times the lower of the two working mode eigenfrequencies, where the sensor arrangements are adapted to register oscillations of the oscillators.
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公开(公告)号：US12117325B2
公开(公告)日：2024-10-15
申请号：US17607962
申请日：2020-03-31
发明人： Hao Zhu , Alfred Rieder , Yaoying Lin
CPC分类号： G01F1/8436 , G01N9/002 , G01N11/16 , G01F1/8477 , G01N2009/006
摘要： The disclosure relates to a measuring device for characterizing a non-homogeneous, flowable medium, and for determining the density, the mass flow rate and/or the viscosity of the medium measuring tube for guiding the medium. includes at least one mode of oscillation, the natural frequency of which depends on the density of the medium An exciter for exciting the mode of oscillation and an operation and evaluation circuit designed to apply an excitation signal to the exciter, to capture signals from the oscillation sensor, to determine current values of the natural frequency of the oscillator and fluctuations of the natural frequency on the basis of the signals from the oscillation sensor.
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50.发明授权公开(公告)号：US12098944B2
公开(公告)日：2024-09-24
申请号：US17754074
申请日：2020-08-20
发明人： Alfred Rieder , Hao Zhu , Wolfgang Drahm , Andreas Güttler
摘要： An arrangement includes a pipeline and a Coriolis volumetric flow meter for measuring a mass flow rate of a medium flowing through the pipeline. A first pressure sensor is attached at an inlet-side of the pipeline and a second pressure sensor is attached at an outlet-side of the pipeline, or wherein a differential pressure sensor is configured to detect a difference between an inlet-side and an outlet-side. The pressure sensors and/or the differential pressure sensor are configured to measure a media pressure and to determine, for each differential pressure, a volumetric flow velocity of the medium through the pipeline. A first monitoring sensor is attached at an inlet-side portion of the pipeline and a second monitoring sensor is attached at an outlet-side portion of the pipeline, wherein the monitoring sensors are configured to monitor a measurement variable different from the media pressure to identify a static media state.
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