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(12) Patent: | (11) CA 2974847 |
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(54) English Title: | METHOD FOR DETECTING CAVITATION |
(54) French Title: | PROCEDE DE DETECTION DE CAVITATION |
Status: | Granted and Issued |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | GOWLING WLG (CANADA) LLP |
(74) Associate agent: | |
(45) Issued: | 2020-09-22 |
(86) PCT Filing Date: | 2015-11-13 |
(87) Open to Public Inspection: | 2016-08-04 |
Examination requested: | 2018-11-15 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | Yes |
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(86) PCT Filing Number: | PCT/EP2015/076500 |
(87) International Publication Number: | EP2015076500 |
(85) National Entry: | 2017-07-25 |
(30) Application Priority Data: | ||||||
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Disclosed is a method for detecting cavitation during operation of a hydraulic machine which has at least one impeller, said method using at least one structure-borne noise sensor, wherein the following method steps are carried out: detecting the signal of the at least one sensor over a period of time which comprises at least one rotation of the impeller; band pass filtration of the signal; preparing the signal; temporally dividing the signal into suitable time intervals (the following three steps are carried out separately for the individual partial signals); spectral decomposition; applying an event counter in the frequency domain; weighting the events with respect to their extent in the frequency band; calculating at least one characteristic value from the weighted events of all the partial signals; comparing the at least one characteristic value with at least one limit value.
L'invention concerne un procédé de détection de cavitation pendant le fonctionnement d'une machine hydraulique, qui comprend au moins une roue à aubes, à l'aide d'au moins un capteur de bruit de structure. Le procédé comprend les étapes suivantes consistant : à détecter le signal de l'au moins un capteur pendant une durée qui comprend au moins une révolution de la roue à aubes; à filtrer le signal au moyen d'un filtre passe-bande; à effectuer un traitement sur le signal; à diviser temporellement le signal en intervalles de temps appropriés (les trois étapes successives sont effectuées séparément sur les signaux partiels individuels); à effectuer une décomposition spectrale; à appliquer un compteur d'événements dans le domaine de fréquence; à pondérer les événements relativement à leur étendue dans la bande de fréquence; à calculer au moins une valeur caractéristique à partir des événements pondérés de tous les signaux partiels; et à comparer l'au moins une valeur caractéristique avec au moins une valeur seuil.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 2974847 was not found.
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Description | Date |
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Change of Address or Method of Correspondence Request Received | 2021-03-19 |
Revocation of Agent Request | 2021-03-19 |
Appointment of Agent Request | 2021-03-19 |
Common Representative Appointed | 2020-11-07 |
Grant by Issuance | 2020-09-22 |
Inactive: Cover page published | 2020-09-21 |
Inactive: Final fee received | 2020-07-22 |
Pre-grant | 2020-07-22 |
Letter Sent | 2020-07-16 |
4 | 2020-07-16 |
Notice of Allowance is Issued | 2020-07-16 |
Notice of Allowance is Issued | 2020-07-16 |
Inactive: Q2 passed | 2020-06-02 |
Inactive: Approved for allowance (AFA) | 2020-06-02 |
Amendment Received - Voluntary Amendment | 2020-01-23 |
Examiner's Report | 2019-11-07 |
Common Representative Appointed | 2019-10-30 |
Common Representative Appointed | 2019-10-30 |
Inactive: Report - No QC | 2019-10-25 |
Letter Sent | 2018-11-20 |
Request for Examination Requirements Determined Compliant | 2018-11-15 |
All Requirements for Examination Determined Compliant | 2018-11-15 |
Request for Examination Received | 2018-11-15 |
Change of Address or Method of Correspondence Request Received | 2018-01-16 |
Inactive: Cover page published | 2017-10-03 |
Inactive: First IPC assigned | 2017-09-29 |
Inactive: Notice - National entry - No RFE | 2017-08-08 |
Inactive: IPC assigned | 2017-08-02 |
Inactive: IPC assigned | 2017-08-02 |
Application Received - PCT | 2017-08-02 |
National Entry Requirements Determined Compliant | 2017-07-25 |
Amendment Received - Voluntary Amendment | 2017-07-25 |
Application Published (Open to Public Inspection) | 2016-08-04 |
There is no abandonment history.
The last payment was received on 2019-11-05
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
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Fee Type | Anniversary Year | Due Date | Paid Date |
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Basic national fee - standard | 2017-07-25 | ||
MF (application, 2nd anniv.) - standard | 02 | 2017-11-14 | 2017-10-23 |
MF (application, 3rd anniv.) - standard | 03 | 2018-11-13 | 2018-10-31 |
Request for examination - standard | 2018-11-15 | ||
MF (application, 4th anniv.) - standard | 04 | 2019-11-13 | 2019-11-05 |
Final fee - standard | 2020-11-16 | 2020-07-22 | |
MF (patent, 5th anniv.) - standard | 2020-11-13 | 2020-11-02 | |
MF (patent, 6th anniv.) - standard | 2021-11-15 | 2021-10-29 | |
MF (patent, 7th anniv.) - standard | 2022-11-14 | 2022-10-31 | |
MF (patent, 8th anniv.) - standard | 2023-11-14 | 2023-10-30 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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VOITH PATENT GMBH |
Past Owners on Record |
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HELMUT SCHMIDT |