WO2006117375A2 - Verfahren und system zur diagnose von mechanischen, elektromechanischen oder fluidischen komponenten - Google Patents
Verfahren und system zur diagnose von mechanischen, elektromechanischen oder fluidischen komponenten Download PDFInfo
- Publication number
- WO2006117375A2 WO2006117375A2 PCT/EP2006/061984 EP2006061984W WO2006117375A2 WO 2006117375 A2 WO2006117375 A2 WO 2006117375A2 EP 2006061984 W EP2006061984 W EP 2006061984W WO 2006117375 A2 WO2006117375 A2 WO 2006117375A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- measurement signal
- signal
- transducer
- noise
- intensity
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
Definitions
- the invention relates to a method for the diagnosis of mechanical, electromechanical or fluidic components, in particular of a valve which can be actuated by a positioner via a drive, according to the preamble of claim 1 and a system for diagnosis of such compo ⁇ nents according to the preamble of the claim 4th
- a diagnostic system for a actuated by a position controller via a drive valve is known in which the Intensi ⁇ ty of the structure-borne sound signal in a spectral range above 50 kHz for detecting a leakage in the valve is used.
- the known diagnostic system requires a spec ⁇ tral analysis of the measurement signal and thus a considerable on ⁇ wall of electronics and computing power. Associated with this is an increased electrical power consumption of the evaluation device.
- the invention has for its object to provide a method and a system for the diagnosis of mechanical, electro-mechanical or fluidic components, which are characterized by a low cost.
- the invention has the advantage that a much lower switching and energy expenditure for implementing the procedural ⁇ 's proceedings required than previously.
- This advantage is achieved that are combined to be implemented functions and greatly simplified by playing a component simultaneously fulfills several functions at ⁇ .
- a sensor for structure-borne sound in addition to the egg ⁇ tual conversion of the sound signal into an electrical signal at the same time the function of a Bandpassfilte- tion.
- a measurement signal is already generated by the transducer for structure-borne noise, which has predominantly signal components in the frequency range relevant for the respective application. Further filter elements are therefore not mandatory.
- a subsampling of the measurement signal is performed.
- a minimization of the required computing power takes place.
- sub-sampling causes a reduction in the speed requirements imposed on the analog-to-digital conversion.
- a Sub-scan means that the measuring signal is detected with a clotting ⁇ Geren sampling rate for the digital wide development than the Messsig- would be required according to the known Nyquist-Shannon sampling theorem for the analysis of the frequency of interest shares Nals.
- sub-sampling is preferably performed at a sampling rate which is orders of magnitude lower.
- This measure is based on the finding that the sound intensity in the frequency range of interest can also be determined with a strong undersampling because of the bandpass filtering and that thus can be dispensed with a complex Fast Fourier transform for analyzing and viewing the frequency range of interest. Since only signal components in the frequency range of interest are present in the bandpass-filtered measurement signal, the intensity determined with a sub-sampling corresponds to that of the measurement signal in the frequency range of interest.
- the intensity of the subsampled measurement signal is now compared in a simple manner with a threshold to a
- This threshold can be predetermined, for example, by manual input or by a prior measurement and analysis in a good condition.
- the low required computing power and electrical power is now an integration of the diagnosis with body sound measurement and signal analysis in existing devices, such as sensors or actuators of Sawinstrumentie ⁇ tion, in particular an integration in a control valve that with a positioner can be actuated via a drive, possible.
- This integration is particularly simple if a microcontroller is already present in the device which, in addition to its previous tasks, readily requires the calculations necessary for evaluating the measurement signal can take over.
- the new diagnostic method and system is therefore characterized by a particularly low cost, which must be applied to carry out the diagnosis.
- a particularly low computational complexity, and associated therewith, a particularly low energy requirement of the calculations exporting microcontroller is achieved when the gêt- de average of the amounts of the individual samples is true as a parameter of the intensity of sub-sampled measurement signal be ⁇ and is compared with the predetermined threshold value.
- signal amplification of the signal produced by the structure-borne sound pickup may be made with additional bandpass filtering in an electronic circuit having only one operational amplifier.
- the optional operational amplifier is used on the one hand for signal amplification and on the other hand through its circuitry for bandpass filtering.
- the bandpass filtering leaves only the signal components that are in the
- FIG. 1 is a block diagram of a diagnostic system
- FIG. 2 shows a diagnostic system with optional active bandpass filter
- FIG. 3 is a timing diagram of a bandpass filtered measurement signal.
- a transducer 1 for structure-borne noise has, according to FIG. 1, a piezoceramic 2 which is provided with electrodes.
- a capacity of CO which, if can be modified by additional factors Kondensa ⁇ required.
- an inductance Ll is connected in parallel, which, as indicated in Figure 1 with broken lines, is integrated in the transducer 1.
- the inductance can be realized as getrenn ⁇ tes component.
- the mechanical resonance frequency of the piezoceramic 2, the capacitance CO and the inductance L 1 are suitably matched to one another.
- the measuring signal 3 is fed to an analog input ADC IN of a microcontroller 4.
- the microcontroller 4 forms an evaluation device in which a subparagraph sampling of the measuring signal 3 made and a Hyundaimeldesig ⁇ is generated NAL 9, when the intensity of sub-sampled measurement signal 3 exceeds a predetermined threshold.
- the intensity is determined by calculating a simple characteristic K corresponding to the average of the magnitudes of the individual samples.
- the formula is:
- the diagnostic system according to FIG. 1 is integrated in an electropneumatic positioner for a valve which can be actuated by a pneumatic drive.
- the microcontroller 4 is the microcontroller already present in the positioner. It is particularly clear that the new diagnostic system can be supplemented with very little effort in an existing positioner. In principle, only the transducer 1 for structure-borne noise and an analog input of the microcontroller 4 is required. The required changes in the program of the microcontroller 4 for carrying out the diagnostic method are ⁇ due to the simple calculations of comparatively small scale. The calculations require only a small part of the existing computing power of the microcontroller 4.
- the gain of the measuring signal 3 is carried out by utilizing the resonance rise of the resonance circuit, which is det by the capacity CO of the piezoelectric ceramic and the inductor Ll gebil ⁇ .
- FIG. 2 shows a diagnostic system which is expanded by an optional amplifier circuit 5.
- the additional amplifier circuit 5 consists in its core of an operational amplifier 6, the supply terminals are connected to a positive power supply voltage VCC or to ground. On the reference input of the operational amplifier 6, the half versor ⁇ supply voltage VCC / 2 is performed.
- the surgical Amplifier 6 In the input path of the surgical Amplifier 6 is a series circuit of a resistor Rl and a capacitor Cl arranged.
- the feedback branch is a parallel circuit of a resistor R2 and a capacitor C2.
- the structure-borne sound pickup 1 and the electronic circuit 5 are specifically optimized for high sensitivity to flow noise while insensitivity to the working noise of pumps or similar adjacent components.
- the mounting of the pickup 1 is carried out continuously at a preparatory ⁇ ended smooth outside surface be on the valve housing with a Schrau ⁇ .
- a tem ⁇ peraturbe For a reliable acoustic coupling a tem ⁇ peraturbe damagess coupling grease between the valve body and Sen ⁇ sor provides.
- the attachment can be made with good acoustic coupling to the housing of the positioner.
- no additional sensors are necessary.
- An adaptation of the evaluation to changing load ⁇ conditions such as pressure and stroke rate can be done automatically, without any parameters must be set or that a calibration would be necessary to a Gutschreib.
- the alarm thresholds can also be set manually by a user.
- FIG. 3 serves to illustrate the principle of undersampling, which leads to a considerable reduction of the power requirement associated with the evaluation.
- Shown is a curve 7 of the bandpass-filtered measuring signal with 100 ab- probes obtained at a sampling rate which is conventionally adapted to the frequency range of interest.
- On the abscissa the number of the sample, the so-called sample is plotted on the ordinate its amplitude.
- every tenth sample is included in the further processing.
- the samples of the sub-sampling taken into account in this case are marked by dots in the course of the measurement signal, for example the sample value 8.
- the calculated mean value which is compared with a predetermined threshold value, is shown as a horizontal line 10 in FIG. It will be appreciated that in moving averaging of the amounts of the samples, whether a sub-sample is made or not, a similar characteristic is calculated as the average.
- An essential requirement of this effec ⁇ TES is that the signal components of the measurement signal are limited by band-pass filtering in the frequency range of interest. It can thus be dispensed with a complex Fast Fourier analysis for viewing the frequency range of interest.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Examining Or Testing Airtightness (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06754960A EP1877739A2 (de) | 2005-05-04 | 2006-05-02 | Verfahren und system zur diagnose von mechanischen, elektromechanischen oder fluidischen komponenten |
CN2006800151486A CN101171499B (zh) | 2005-05-04 | 2006-05-02 | 用于诊断机械的、电子机械的或者流体的组件的方法和系统 |
US11/919,855 US7703326B2 (en) | 2005-05-04 | 2006-05-02 | Method and system for diagnosing mechanical, electromechanical or fluidic components |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005020900.9 | 2005-05-04 | ||
DE102005020900A DE102005020900B3 (de) | 2005-05-04 | 2005-05-04 | Verfahren und System zur Diagnose von mechanischen, elektromechanischen oder fluidischen Komponenten |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2006117375A2 true WO2006117375A2 (de) | 2006-11-09 |
WO2006117375A3 WO2006117375A3 (de) | 2007-03-22 |
Family
ID=36939108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/061984 WO2006117375A2 (de) | 2005-05-04 | 2006-05-02 | Verfahren und system zur diagnose von mechanischen, elektromechanischen oder fluidischen komponenten |
Country Status (5)
Country | Link |
---|---|
US (1) | US7703326B2 (de) |
EP (1) | EP1877739A2 (de) |
CN (1) | CN101171499B (de) |
DE (1) | DE102005020900B3 (de) |
WO (1) | WO2006117375A2 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005020901A1 (de) * | 2005-05-04 | 2006-11-16 | Siemens Ag | Verfahren und System zur Diagnose von mechanischen, elektromechanischen oder fluidischen Komponenten |
WO2008020449A2 (en) * | 2006-08-16 | 2008-02-21 | Xceed Imaging Ltd. | Method and system for imaging with a zoom |
JP5378181B2 (ja) * | 2009-12-07 | 2013-12-25 | 株式会社日立製作所 | システム、システム構築方法、管理端末、プログラム |
FR2956159B1 (fr) * | 2010-02-08 | 2012-02-10 | Snecma | Methode de detection automatisee de l'ingestion d'au moins un corps etranger par un moteur a turbine a gaz |
TWI449883B (zh) * | 2011-02-10 | 2014-08-21 | Univ Nat Taiwan Science Tech | 結構體安全性之分析方法 |
US8800373B2 (en) | 2011-02-14 | 2014-08-12 | Rosemount Inc. | Acoustic transducer assembly for a pressure vessel |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5477729A (en) | 1993-09-02 | 1995-12-26 | K.K. Holding Ag | Acoustic emission transducer |
EP1216375B1 (de) | 1999-09-30 | 2003-05-02 | Siemens Aktiengesellschaft | Diagnosesystem und -verfahren, insbesondere für ein ventil |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0711466B2 (ja) * | 1987-04-28 | 1995-02-08 | 株式会社荏原製作所 | メカニカルシールの運転状態監視方法 |
US5361628A (en) * | 1993-08-02 | 1994-11-08 | Ford Motor Company | System and method for processing test measurements collected from an internal combustion engine for diagnostic purposes |
US6234021B1 (en) * | 1999-02-02 | 2001-05-22 | Csi Technology, Inc. | Enhanced detection of vibration |
DE29912847U1 (de) | 1999-07-22 | 2000-08-31 | Siemens Ag | Schallaufnehmer |
US20010047691A1 (en) * | 2000-01-03 | 2001-12-06 | Yuris Dzenis | Hybrid transient-parametric method and system to distinguish and analyze sources of acoustic emission for nondestructive inspection and structural health monitoring |
US6499350B1 (en) * | 2000-04-04 | 2002-12-31 | Swantech, L.L.C. | Turbine engine foreign object damage detection system |
JP2004506186A (ja) * | 2000-08-09 | 2004-02-26 | エンデヴコ・コーポレーション | 高周波数および低周波数帯域の双方出力トランスデューサ |
DE10135674A1 (de) * | 2001-07-21 | 2003-02-06 | Brueel & Kjaer Vibro Gmbh | Verfahren und Vorrichtung zur Auswertung von Meßsignalen |
DE102005020901A1 (de) * | 2005-05-04 | 2006-11-16 | Siemens Ag | Verfahren und System zur Diagnose von mechanischen, elektromechanischen oder fluidischen Komponenten |
-
2005
- 2005-05-04 DE DE102005020900A patent/DE102005020900B3/de not_active Expired - Fee Related
-
2006
- 2006-05-02 US US11/919,855 patent/US7703326B2/en not_active Expired - Fee Related
- 2006-05-02 CN CN2006800151486A patent/CN101171499B/zh not_active Expired - Fee Related
- 2006-05-02 EP EP06754960A patent/EP1877739A2/de not_active Withdrawn
- 2006-05-02 WO PCT/EP2006/061984 patent/WO2006117375A2/de not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5477729A (en) | 1993-09-02 | 1995-12-26 | K.K. Holding Ag | Acoustic emission transducer |
EP1216375B1 (de) | 1999-09-30 | 2003-05-02 | Siemens Aktiengesellschaft | Diagnosesystem und -verfahren, insbesondere für ein ventil |
Also Published As
Publication number | Publication date |
---|---|
CN101171499A (zh) | 2008-04-30 |
US20090090185A1 (en) | 2009-04-09 |
WO2006117375A3 (de) | 2007-03-22 |
US7703326B2 (en) | 2010-04-27 |
DE102005020900B3 (de) | 2006-11-02 |
CN101171499B (zh) | 2010-09-01 |
EP1877739A2 (de) | 2008-01-16 |
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