Time-frequency analysis method for non-stationary signals in starting process of hydroelectric generating set
The invention discloses a time-frequency analysis method for a non-stationary signal in a starting process of a hydroelectric generating set, which comprises the following steps of: properly reducing sampling frequency, adopting synchronous compression wavelet transform, and analyzing time-frequency...
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| creator | WANG TAO CHANG YONGTAO LUO QIANLIN HE BAOMIN LI LI LIU PAN DUAN WEI WANG XUEGANG HE XIURU ZHANG XING YANG HONG HE YUJIE GE RUIWANG TANG XIAODAN MU GUISONG SONG GUOLIN TAO JIQUAN CHENG JIEMING ZHAO WENGUI LIAO XIANGBO LIU LINLIN |
| description | The invention discloses a time-frequency analysis method for a non-stationary signal in a starting process of a hydroelectric generating set, which comprises the following steps of: properly reducing sampling frequency, adopting synchronous compression wavelet transform, and analyzing time-frequency characteristics of vibration of the set when the set is started, so as to quantitatively describe a relationship between time and frequency of a vibration time-varying signal and accurately evaluate instantaneous characteristics of the set. Compared with short-time Fourier transform, the method has better frequency domain focusing capacity and can be well suitable for extracting the vibration characteristic frequency in the starting process of the hydroelectric generating set, an analysis result shows that rotating frequencies and obvious frequency multiplication components of all orders exist in a set throw measuring point in the speed increasing process of the set, the frequencies are correspondingly increased a |
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Compared with short-time Fourier transform, the method has better frequency domain focusing capacity and can be well suitable for extracting the vibration characteristic frequency in the starting process of the hydroelectric generating set, an analysis result shows that rotating frequencies and obvious frequency multiplication components of all orders exist in a set throw measuring point in the speed increasing process of the set, the frequencies are correspondingly increased a</description><language>chi ; eng</language><subject>ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS ; CALCULATING ; COMPUTING ; COUNTING ; ELECTRIC DIGITAL DATA PROCESSING ; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES ; MEASURING ; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE ; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR ; PHYSICS ; TARIFF METERING APPARATUS ; TESTING ; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES ; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR</subject><creationdate>2024</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20240920&DB=EPODOC&CC=CN&NR=118670766A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25563,76318</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20240920&DB=EPODOC&CC=CN&NR=118670766A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>WANG TAO</creatorcontrib><creatorcontrib>CHANG YONGTAO</creatorcontrib><creatorcontrib>LUO QIANLIN</creatorcontrib><creatorcontrib>HE BAOMIN</creatorcontrib><creatorcontrib>LI LI</creatorcontrib><creatorcontrib>LIU PAN</creatorcontrib><creatorcontrib>DUAN WEI</creatorcontrib><creatorcontrib>WANG XUEGANG</creatorcontrib><creatorcontrib>HE XIURU</creatorcontrib><creatorcontrib>ZHANG XING</creatorcontrib><creatorcontrib>YANG HONG</creatorcontrib><creatorcontrib>HE YUJIE</creatorcontrib><creatorcontrib>GE RUIWANG</creatorcontrib><creatorcontrib>TANG XIAODAN</creatorcontrib><creatorcontrib>MU GUISONG</creatorcontrib><creatorcontrib>SONG GUOLIN</creatorcontrib><creatorcontrib>TAO JIQUAN</creatorcontrib><creatorcontrib>CHENG JIEMING</creatorcontrib><creatorcontrib>ZHAO WENGUI</creatorcontrib><creatorcontrib>LIAO XIANGBO</creatorcontrib><creatorcontrib>LIU LINLIN</creatorcontrib><title>Time-frequency analysis method for non-stationary signals in starting process of hydroelectric generating set</title><description>The invention discloses a time-frequency analysis method for a non-stationary signal in a starting process of a hydroelectric generating set, which comprises the following steps of: properly reducing sampling frequency, adopting synchronous compression wavelet transform, and analyzing time-frequency characteristics of vibration of the set when the set is started, so as to quantitatively describe a relationship between time and frequency of a vibration time-varying signal and accurately evaluate instantaneous characteristics of the set. 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| subjects | ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS CALCULATING COMPUTING COUNTING ELECTRIC DIGITAL DATA PROCESSING MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR |
| title | Time-frequency analysis method for non-stationary signals in starting process of hydroelectric generating set |
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