-
公开(公告)号：US10914701B2
公开(公告)日：2021-02-09
申请号：US15626708
申请日：2017-06-19
摘要： Embodiments of the disclosure are directed at determining rotor deterioration in a dynamoelectric machine. Various current and voltage measurements are carried out upon an exciter assembly when the dynamoelectric machine is operated at various speeds and at various occasions over an extended period of time. More particularly, a set of current and voltage measurements that are carried out when the dynamoelectric machine is in a slow-roll mode of operation can be used for determining a resistance of a current path through which the exciter assembly provides electrical power to a rotor assembly. A time-domain-to-frequency-domain conversion can be carried out upon this set of resistance measurements in order to generate a spectral signature. The spectral signature can then be evaluated to detect an altered rotor resistance condition and/or a rotor resistance alteration trend.
-
公开(公告)号：US10823595B2
公开(公告)日：2020-11-03
申请号：US16744468
申请日：2020-01-16
申请人： GRUNDFOS HOLDING A/S
发明人： Ole Hartlev Pedersen
摘要： A method evaluates a frequency spectrum representative of at least one time-dependent signal, the at least one time dependent signal being derived from an output from a measuring device under predetermined measuring device operating conditions. The time-dependent signal, includes a portion being representative of a wanted signal, and a portion being representative of noise. The method includes the steps of determining, based on the frequency spectrum of the signal, a value representative of the noise floor, identifying, based on the frequency spectrum of the signal derived under the predetermined operating condition, a peak component, and if the peak component satisfies a relative peak criterion determined on the basis of the determined value representative of the noise floor, determining the wanted signal by applying a predetermined algorithm. The invention further relates to a method for determining flow of a measuring device, and a sensor.
-
公开(公告)号：US10768213B2
公开(公告)日：2020-09-08
申请号：US15690852
申请日：2017-08-30
发明人： Lynn R. Miles , Damon C. Bradley , Englin Wong , Alicia T. Joseph
IPC分类号： G01R23/165 , G01R23/16 , G01R23/06 , G01R29/08
摘要： A software-defined radiometer includes dual RF front end channels. One RF front end channel processes the horizontal polarization signals and the other RF front end channel processes the vertical polarization signals. Each RF front end channel includes a power splitter for splitting the polarization signals into a plurality of identical polarization signals, a filter bank of N-bandpass filters that have the same bandwidth but different center frequencies and a multi-input switch. The bandpass filters filter the horizontal and vertical polarization signals and provide a plurality of filtered horizontal and vertical polarization signals. A control circuit issues a control signal to the multi-input switch so as to route a desired one of the plurality of filtered horizontal and vertical polarization signals to a programmable frequency converter. The programmable frequency converter includes a programmable local oscillator that is configured to generate signals having any one of N frequencies and is used to produce intermediate frequency representations of the horizontal and vertical polarization signals. The intermediate frequency representations are converted into digital signals and processed to extract desired information and data.
-
公开(公告)号：US10591569B2
公开(公告)日：2020-03-17
申请号：US15638347
申请日：2017-06-29
摘要： The disclosure relates to a system and method for correcting inhomogeneity in an MRI image. The method may include the steps of: acquiring a first set of k-space data, acquiring a second set of k-space data, generating the convolution kernel of the first set of k-space data based on the first set of k-space data and the second set of k-space data, performing inverse Fourier transform on the convolution kernel of the first set of k-space data to obtain an inversely transformed convolution kernel of the first set of k-space data, and generating a corrector based on the inversely transformed convolution kernel of the first set of k-space data. The method may be implemented on a machine including at least one processor and storage.
-
公开(公告)号：US10585121B2
公开(公告)日：2020-03-10
申请号：US15262406
申请日：2016-09-12
申请人： TEKTRONIX, INC.
发明人： Ian R. Absher , Kraig M. Strong
摘要： An oscilloscope including an input port for receiving training data including waveforms and corresponding known classifications and a processor for training a plurality of classifiers on the training data. Training includes iteratively applying each classifier to each waveform of the training data to obtain corresponding predicted waveform classifications and comparing the predicted waveform classifications with the known classifications. Classifiers are corrected when predicted waveform classifications does not match the known classifications. Models for each classification are constructed with suggested measurements or actions. Subsequently, live waveform data is captured by the oscilloscope and the classifiers are applied to the live data. When a confidence value for a single classification exceeds a threshold, the waveform data is classified, and suggested measurements or actions are implemented in the oscilloscope based on the classification.
-
公开(公告)号：US10520542B2
公开(公告)日：2019-12-31
申请号：US15164751
申请日：2016-05-25
申请人： Alan Howard
发明人： Alan Howard
摘要： The system includes a positioning system for mounting the circuit board to be tested and for mounting a sensor assembly. A control system registers the position of the sensor assembly relative to the circuit board to be tested and for moving the sensor assembly about the circuit board. The sensor assembly detects noise or other emissions generated by the circuit elements on the board. The noise emissions are separate from the operating signals of the circuit. The spectrum analyzer receives the emissions from the sensor assembly and produces frequency spectrum data over a selected frequency range with amplitude information. A processing system then compares the frequency spectrum information with frequency spectrum information from boards known to be good and provides information as to any differences and whether they are in an acceptable tolerance range.
-
公开(公告)号：US10379147B2
公开(公告)日：2019-08-13
申请号：US14971652
申请日：2015-12-16
IPC分类号： G01R23/16 , G01V3/165 , G01R29/08 , G06F17/50 , G01N27/02 , G01R13/02 , G01R21/133 , G06F17/18
摘要： Some embodiments include an apparatus for determining statistical mean and maximum expected of electromagnetic energy transmission between coupled cavities. Other embodiments of related apparatuses and methods are also disclosed.
-
公开(公告)号：US10338143B2
公开(公告)日：2019-07-02
申请号：US15653054
申请日：2017-07-18
申请人： ROLLS-ROYCE plc
发明人： Chandana J Gajanayake , Sivakumar Nadarajan , Amit K Gupta , Chao Bi , Nay Lin Htun Aung , Jiang Quan
摘要： A fault condition is diagnosed in an electric machine that includes a rotor and a plurality of permanent magnets. To do so, the rotor is rotated so that each of the plurality of permanent magnets passes a magnetic flux density sensor, and the values of magnetic flux density are measured using the magnetic flux density sensor at a plurality of positions of the rotor. The measured values of magnetic flux density are analyzed and a magnitude of a peak amplitude is compared in a time or frequency domain with a reference value. If the peak amplitude is below the reference value, the electric machine is determined to have a fault condition.
-
公开(公告)号：US20190162764A1
公开(公告)日：2019-05-30
申请号：US16245045
申请日：2019-01-10
IPC分类号： G01R23/16 , G01R31/319 , G01R31/302 , G01R13/02
摘要： A graphical display for displaying spectrum analyzer data that represents detected signal levels for frequencies in an identified frequency span includes a signal level axis that represents a range of detected RF signal levels for the spectrum analyzer data and a frequency axis that represents an identified frequency spectrum span for the spectrum analyzer data. Frequency ranges in the identified frequency span having a high concentration of detected RF energy are automatically graphically expanded and displayed on the frequency axis of the graphical display while frequency ranges having a lower concentration of detected RF energy are simultaneously, automatically graphically condensed and displayed on the first frequency axis of the graphical display.
-
公开(公告)号：US10258290B2
公开(公告)日：2019-04-16
申请号：US15182956
申请日：2016-06-15
发明人： Chang Soon Park , Ui Kun Kwon , Sang-joon Kim , Seungkeun Yoon , Jaechun Lee , Changmok Choi
IPC分类号： A61B5/00 , A61B5/04 , G06K9/00 , A61B5/024 , G01R23/16 , A61B5/0402 , A61B5/0488
摘要： A method of processing a biosignal includes estimating a time period from a time-domain biosignal, converting a biosignal corresponding to a time interval based on the time period to a frequency-domain signal, performing signal processing to remove a distortion component from the frequency-domain signal, and converting a processed frequency-domain signal obtained through the signal processing to a time-domain signal.
-
-
-
-
-
-
-
-
-
搜索结果
1366 条记录 (耗时 0.029 秒)
