EP1877740A2 - Procede et dispositif pour diagnostiquer des composantes mecaniques, electromecaniques ou fluidiques - Google Patents

Procede et dispositif pour diagnostiquer des composantes mecaniques, electromecaniques ou fluidiques

Info

Publication number
EP1877740A2
EP1877740A2 EP06754961A EP06754961A EP1877740A2 EP 1877740 A2 EP1877740 A2 EP 1877740A2 EP 06754961 A EP06754961 A EP 06754961A EP 06754961 A EP06754961 A EP 06754961A EP 1877740 A2 EP1877740 A2 EP 1877740A2
Authority
EP
European Patent Office
Prior art keywords
frequency
signal
predetermined threshold
measurement signal
exceeds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06754961A
Other languages
German (de)
English (en)
Inventor
Alf PÜTTMER
Edmund Linzenkirchner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1877740A2 publication Critical patent/EP1877740A2/fr
Withdrawn legal-status Critical Current

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 5th
  • 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 effort.
  • Claim 5 describes a system for carrying out the method, in the dependent claims further developments of the invention are described.
  • the invention has the advantage that considerably less circuit and energy expenditure is required to carry out the method than has hitherto been the case.
  • This advantage is achieved by the combined realizable functions and be greatly simplified in ⁇ same functions several radio ⁇ satisfies the example a device.
  • a sensor for structure-borne sound besides the actual conversion of the sound signal into an electrical signal at the same time filtering function of a bandpass ⁇ .
  • This is achieved in a simple manner in that the mechanical resonance frequency and the capacitance of the transducer as well as an inductance are suitably matched to one another.
  • the measuring signal is fed to a comparator, and determines the frequency with which the level of the Messsig ⁇ Nals exceeds a first predetermined threshold.
  • the invention is based on the finding that the probability is larger for increasing ⁇ the amplitude of the measurement signal that a sampled value is higher than the constant threshold value.
  • An error message signal is generated when the determined frequency exceeds a second predetermined threshold.
  • the frequency with which the level is the first predetermined threshold value can be determined in a simple manner with the aid of a comparator whose output signal ⁇ is queried.
  • a simple statistical characteristic K is suitable, which can be calculated as the ratio of the number of samples having a level exceeding the first predetermined threshold to the total number of samples considered.
  • an interrupt routine of a microcontroller or a counter may count the number of times the first threshold has been exceeded within a time period.
  • the ermit ⁇ Telte frequency is then compared in a simple manner with a two ⁇ th predetermined threshold to obtain a statement as to whether a fault condition of the mechanical, electromechanical or fluidic component is present or not.
  • This second threshold value can be predetermined, for example, by manual input or by a previous measurement and analysis in a good condition.
  • the measurement signal can be fed to a digital input of a microcontroller which records the applied value at predetermined time intervals. asks.
  • a microcontroller which records the applied value at predetermined time intervals.
  • a lower computing power and thus less operating power is required when the time intervals between interrogations by at least an order of magnitude longer than the maximum signal period of the signal components of the frequency of interest in the measurement region ⁇ .
  • a subsampling means that the measurement signal is detected at a lower sampling rate for determining the frequency than would be required according to the known Nyquist-Shannon sampling theorem for analyzing the frequency components of interest of the measurement signal.
  • a signal amplification of the signal generated by the transducer for structure-borne noise can be performed with an additional bandpass filtering in an electronic circuit having only one operational amplifier. This has the advantage that a better selection of the signal components in the frequency range of interest is made possible, without having to increase the energy requirements for the diagnosis significantly.
  • the optional operational amplifier is the one hand nalverstärkung to Sig ⁇ and secondly used by its wiring to the band-pass filtering.
  • the bandpass filtering leaves only the signal components that are related to the phenomenon to be detected.
  • the new diagnostic method and system for leakage detection in control valves is applicable, since this is a frequency range of the measurement signal of interest, which is above 50 kHz and reflects the strength of Kavi ⁇ tion noise.
  • 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 a digital input DIGITAL IN of a microcontroller 4.
  • the microcontact Roller 4 forms an evaluation device, in which programmatically queried at certain time intervals, whether a logical one or a logical zero at the digi ⁇ taleingang DIGITAL IN is present. A logical one is applied to the digital input DIGITAL IN when the level of the measurement signal 3 exceeds a first predetermined threshold. From a plurality of such queries, the microcontroller 4 determines, based on a simple calculation, a statistical characteristic K according to the formula:
  • An error message signal 9 is generated when the characteristic value K exceeds a second predetermined threshold value.
  • 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 a digital input of the microcontroller 4 is required. The changes required in the program of the microcontroller 4 for carrying out the diagnostic procedure are of comparatively small scope due to the simple calculations. The calculations require only a small part of the existing computing power of the microcontroller 4.
  • the amplification of the measurement signal 3 takes place by utilizing the resonance peaking of the resonant circuit, which is caused by the
  • 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. Half the supply voltage VCC / 2 is fed to the reference input of the operational amplifier 6.
  • a series circuit of a resistor Rl and a capacitor Cl is arranged in the input path of the Operations ⁇ amplifier 6, a series circuit of a resistor Rl and a capacitor Cl is arranged.
  • the feedback branch is a parallel circuit of a resistor R2 and a capacitor C2. With correct tuning, this circuit of the operational amplifier 6 becomes simpler
  • the optional operational amplifier 6 is thus on the one hand to Ver ⁇ amplification of the measuring signal 3 and the other hand used by its wiring to the band-pass filtering.
  • the number of electronic components is reduced to a minimum.
  • 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 needing to be set or calibrating to a good condition.
  • the alarm thresholds can also be set manually by a user.
  • FIG. 3 serves to clarify the evaluation of the frequency with which the level of the measuring signal exceeds the first predetermined threshold value. Shown is a Ver ⁇ run 7 of the bandpass filtered measurement signal with 100 sample values, which were obtained at a sampling rate, which is adapted in the usual way 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.
  • the first predetermined threshold value is shown in FIG. 3 as a horizontal line 8.
  • Level exceeds the first predetermined threshold are marked by dots, such as sample 9. It will be appreciated that as the amplitude of the measurement signal increases, the probability increases that samples exceed the constant first threshold.
  • This type of evaluation requires bandpass filtering of the measurement signal to the frequency range of interest. In the framework of fault-related structure-borne sound Fourier analysis Fast thus can be dispensed with for viewing the refsie- Governing frequency range to a manoeuvrable on ⁇ . This leads to a substantial reduction of the computational effort required for carrying out the diagnostic method and thus the power requirement, so that the new diagnostic method can also be used in field devices in which only a limited amount of auxiliary power is available for operation.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un procédé et un système de diagnostic. Ledit système comprend un capteur (1) pour bruits de structure, qui émet, de manière filtrée par passe-bande, un signal de mesure (3) sur la base de sa fréquence de résonance mécanique, de sa capacité (CO) et d'une inductance (LI), ainsi qu'un dispositif d'évaluation (4) dans lequel la fréquence à laquelle le niveau du signal de mesure (3) dépasse une valeur-seuil prédéterminée est définie et qui sert à produire un signal de message d'erreur (9), lorsque la fréquence dépasse une seconde valeur-seuil prédéterminée. Comme pour effectuer un diagnostic, il suffit d'un petit nombre de composants électroniques et d'une faible puissance d'alimentation en énergie, le diagnostic peut bien entendu être intégré dans des appareils existants, notamment dans des appareils à effet de champ de l'appareillage du processus, pour lesquels il n'y a qu'une quantité limitée d'énergie d'exploitation à disposition. L'invention s'utilise avantageusement pour identifier une fuite de soupape avec un régulateur de position électropneumatique.
EP06754961A 2005-05-04 2006-05-02 Procede et dispositif pour diagnostiquer des composantes mecaniques, electromecaniques ou fluidiques Withdrawn EP1877740A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005020901A DE102005020901A1 (de) 2005-05-04 2005-05-04 Verfahren und System zur Diagnose von mechanischen, elektromechanischen oder fluidischen Komponenten
PCT/EP2006/061985 WO2006117376A2 (fr) 2005-05-04 2006-05-02 Procede et dispositif pour diagnostiquer des composantes mecaniques, electromecaniques ou fluidiques

Publications (1)

Publication Number Publication Date
EP1877740A2 true EP1877740A2 (fr) 2008-01-16

Family

ID=37295175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06754961A Withdrawn EP1877740A2 (fr) 2005-05-04 2006-05-02 Procede et dispositif pour diagnostiquer des composantes mecaniques, electromecaniques ou fluidiques

Country Status (4)

Country Link
US (1) US7757556B2 (fr)
EP (1) EP1877740A2 (fr)
DE (1) DE102005020901A1 (fr)
WO (1) WO2006117376A2 (fr)

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DE102005020900B3 (de) * 2005-05-04 2006-11-02 Siemens Ag Verfahren und System zur Diagnose von mechanischen, elektromechanischen oder fluidischen Komponenten
GB2478087B (en) * 2006-04-21 2011-12-07 Flowserve Man Co Valve system
GB2452639B (en) * 2006-04-21 2011-08-10 Flowserve Man Co Rotary encoder frequency analysis
US8471194B2 (en) * 2006-04-21 2013-06-25 Flowserve Management Company Rotary encoder for diagnosing problems with rotary equipment
US8246573B2 (en) * 2010-04-27 2012-08-21 Medtronic, Inc. Detecting empty medical pump reservoir
US9192719B2 (en) * 2010-11-01 2015-11-24 Medtronic, Inc. Implantable medical pump diagnostics
CN103217211B (zh) * 2013-04-09 2015-04-22 国家电网公司 一种基于合成孔径原理的变电站噪声源分布测量方法
US9987416B2 (en) * 2015-01-09 2018-06-05 BioQuiddity Inc. Sterile assembled liquid medicament dosage control and delivery device
CA2981977C (fr) * 2015-04-06 2020-07-14 Medela Holding Ag Systeme d'extraction de lait maternel ameliore dote de caracteristiques de detection, de retroaction et de connectabilite
US10667023B2 (en) 2015-05-21 2020-05-26 Armstrong International, Inc. Steam/hot water monitoring and control system
US11338082B2 (en) 2019-09-04 2022-05-24 BloQ Pharma, Inc. Variable rate dispenser with aseptic spike connector assembly
CN111929074A (zh) * 2020-08-19 2020-11-13 北京经纬恒润科技有限公司 车辆机械旋转部件故障诊断方法及装置

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Also Published As

Publication number Publication date
WO2006117376A2 (fr) 2006-11-09
DE102005020901A1 (de) 2006-11-16
US7757556B2 (en) 2010-07-20
US20090090186A1 (en) 2009-04-09
WO2006117376A3 (fr) 2007-05-31

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