EP3268954A1 - Dispositif et appareil de terrain de la technique de mesure de processus - Google Patents

Dispositif et appareil de terrain de la technique de mesure de processus

Info

Publication number
EP3268954A1
EP3268954A1 EP16704442.9A EP16704442A EP3268954A1 EP 3268954 A1 EP3268954 A1 EP 3268954A1 EP 16704442 A EP16704442 A EP 16704442A EP 3268954 A1 EP3268954 A1 EP 3268954A1
Authority
EP
European Patent Office
Prior art keywords
damping element
natural frequency
arrangement according
frequency
annular
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.)
Granted
Application number
EP16704442.9A
Other languages
German (de)
English (en)
Other versions
EP3268954B1 (fr
Inventor
Yaoying Lin
Alfred Rieder
Wolfgang Drahm
Michal Bezdek
Pierre Ueberschlag
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec 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 Endress and Hauser Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP3268954A1 publication Critical patent/EP3268954A1/fr
Application granted granted Critical
Publication of EP3268954B1 publication Critical patent/EP3268954B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
    • G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
    • G10K1/062—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated
    • G10K1/066—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated the sounding member being a tube, plate or rod
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
    • G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
    • G10K1/08—Details or accessories of general applicability
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • G10K11/04—Acoustic filters ; Acoustic resonators

Definitions

  • the present invention comprises an arrangement according to the preamble of claim 1 and a field device of process measurement technology
  • the present invention solves this problem by a device having the features of claim 1.
  • An inventive arrangement comprises an ultrasonic transducer and a
  • an ultrasonic transducer is not limited exclusively to piezoelectric elements or others
  • ultrasonic generating elements may also include the portion of the assembly which the ultrasonic signal must pass before entering the medium. This may include, for example, one or more coupling layers or matching layers.
  • a metallic attachment may be part of the ultrasonic transducer from which an ultrasonic signal is emitted into a gaseous or liquid medium. Particularly preferably, this metallic attachment is connected by means of a joint with the damping element.
  • the damping element connects the ultrasonic transducer with a housing or Meßrohrwandung.
  • this wall is not part of the arrangement.
  • the transducer has an attachment with a wetted surface.
  • Ultrasonic signals are emitted from the surface into a gaseous or liquid medium.
  • This can be a measuring medium in the case of a flow meter or, for example, in level measurement. Air.
  • the damping element has at least two annular grooves and a ring-shaped segment arranged therebetween.
  • An annular segment is an annular trained circumferential projection.
  • the annular mass segment always has the same wall thickness along its circumference.
  • the damping element has a first natural frequency f a , in which the annular mass segment has an axial movement parallel to the longitudinal direction of the
  • Damping element has a plurality of axial modes, so is to be understood as the first natural frequency, the highest natural frequency at which the annular mass segment performs an axial movement parallel to the longitudinal direction of the damping element.
  • damping element according to the invention has a second natural frequency f r , in which the ring mass segment rotates, preferably around its
  • Mass center executes. This can also be called rotation mode. If the damping element has a plurality of rotational modes, then the first natural frequency is to be understood as the lowest natural frequency at which the annular mass segment has a
  • the ratio of the first natural frequency f a to the second natural frequency f r is smaller than 0.75 according to the invention.
  • This arrangement allows a selection of the useful frequency over a very wide
  • the ratio of the first natural frequency f a to the second natural frequency f r is less than 0.55, particularly preferably less than 0.4.
  • the damping element at least in the region of a first of the at least two annular grooves has a first average distance r 2 from the outer wall of a hollow cylindrical portion to the longitudinal axis L.
  • the averaging of the distance relates to a distance averaged over the circumference and the length of the annular groove.
  • individual areas may deviate from the mean.
  • the damping element has a second average distance r-1 from the inner wall of the hollow-cylindrical partial region to the longitudinal axis L.
  • the averaging of the distance refers to a distance of the inner wall to the longitudinal axis averaged over the circumference and the length of the annular groove.
  • annular mass segment between the two annular grooves on a certain length l 3 in the axial direction is also averaged over the length and perimeter.
  • r-1, r 2 and l 3 are given in millimeters.
  • the hollow cylindrical portion is rotationally symmetric.
  • ultrasonic transducer and the damping element are connected to one another in a material-locking manner.
  • the damping element has less than 5 annular grooves.
  • An increasing number of annular grooves means an increasing danger of
  • the length of the at least two annular grooves is the same length in the axial direction and that the length of the annular segment is greater, preferably at least 1.5 times as large as the length of one of the two annular grooves. Due to the design of the
  • Ringmassesegments over a large longitudinal range away the structure-borne sound can be better wiped out and at the same time a better split between Axialmoden and
  • the ultrasonic transducer terminal a bending plate having a surface from which the ultrasonic signal is emitted into the medium, which Bending plate edge free swinging is formed.
  • Ultrasound signal is emitted in a medium.
  • the ultrasonic signal can advantageously be transmitted over a large area into the gaseous or liquid medium.
  • the arrangement in a frequency range in which the ratio of the useful frequency to the first natural frequency is greater than 1, 6 and in which the ratio of the useful frequency to the second natural frequency is less than 0.7 has no axial or rotational natural frequency ,
  • the arrangement can not have an axial or rotational natural frequency in the range between 50,000 and 120,000 hearts.
  • a field device according to the invention of process measurement technology, in particular an ultrasonic flowmeter for measuring gaseous media, has a measuring tube to which an arrangement according to claim 1 is attached.
  • the arrangement can also be used in a level gauge, wherein the measuring tube but usually by a storage vessel -. a tank or a silo is replaced.
  • Fig. 1 shows an inventive arrangement comprising an ultrasonic transducer and a
  • Fig. 2 shows an arrangement according to the prior art
  • FIG. 3 shows a frequency spectrum of the arrangement from FIG. 1 and the arrangement according to FIG. 2
  • FIG. 6 shows a representation of the vibration behavior of the arrangement according to the invention at an excitation frequency in the region of a rotation mode.
  • the present arrangement can be used both in level gauges and in
  • Ultrasonic flowmeters are widely used in process and automation technology. They allow in a simple way, the volume flow and / or
  • the known ultrasonic flowmeters often work according to the transit time difference principle.
  • the different transit times of ultrasonic waves in particular Uitraschallimpulsen, so-called bursts are evaluated relative to the flow direction of the liquid.
  • ultrasonic pulses at a certain angle to Tube axis sent both with and against the flow. From the transit time difference, the flow rate and thus at a known diameter of the
  • Pipe section to determine the volume flow.
  • the ultrasonic waves are generated with the help of so-called ultrasonic transducers
  • the ultrasonic transducers usually have an electromechanical
  • Transducer element e.g. one or more piezoelectric elements
  • the ultrasonic transducers are arranged in a common plane on the measuring tube, either on opposite sides of the measuring tube, then the acoustic signal, projected on a tube cross-section, once along a secant through the measuring tube , or on the same side of the measuring tube, then the acoustic signal is reflected on the opposite side of the measuring tube, whereby the acoustic signal passes twice through the measuring tube along the projected on the cross section through the measuring tube secant.
  • Fig. 1 is an arrangement with a corresponding ultrasonic transducer 1 with two superposed electromechanical
  • Transducer elements 2. in particular with two piezo elements, designed.
  • Ultrasonic transducer 1 also has an attachment 4 with a surface 5 in contact with the medium. At this surface 5 are the by or the electromechanical
  • Transducer elements 2 generated ultrasonic waves to the measuring medium.
  • the attachment 4 shown in FIG. 1 has a base 6 which is in contact, in particular in positive contact, with the electromechanical transducer elements 2. Furthermore, the article 4 on a bending plate 7 on with the medium-contacting surface 5.
  • the base 6 of the attachment 4 has an interface 16 to a damping element 15.
  • This damping element 15 is designed as a cylindrical body with at least two mutually parallel annular grooves 10 and 12.
  • the interface 16 may be formed, for example, as a welded joint.
  • Ringmassesegment 9 arranged, which has a greater wall thickness, in particular at least twice as thick wall thickness, as the annular groove 10th
  • a second ring segment 1 1 is also arranged, which has a greater wall thickness, in particular at least twice as thick wall thickness, as the annular grooves 10 and 12th
  • the damping element 15 is essentially defined by three radii. There is a first radius r-, which extends from a longitudinal axis L of the damping element 15 to an inner wall of the cylindrical body. Furthermore, a second radius r is provided, which describes the distance of the outer wall in the region of the annular grooves 10. 12 to the longitudinal axis. Finally, a third radius r 3 is provided, which describes the radial distance between the longitudinal axis and the outermost point of the second Ringmassesegments 1 1.
  • the damping element 15 is connected via an interface 17 in the region of the third radius r 3 with a housing wall 14.
  • the interface 17 may be formed as a welded joint.
  • the interface is arranged in Fig. 1 on radially outside the second radius r 2 and in the region of the third radius r 3 .
  • the annular grooves 10 and 12 extend over a respective longitudinal section and l 2 along the longitudinal axis L. These lengths and l 2 are dimensioned the same in Fig. 1.
  • the second annular mass segment 11 extends over a longitudinal section l 3 , which in the exemplary embodiment of FIG. 1 is larger than the longitudinal sections and i 2 .
  • the first annular mass segment 9 is connected at its radially outermost point with a ring segment 8, which extends from the interface 16 to the ring mass 9. This ring segment 8 has a smaller, preferably at least twice as small wall thickness as the first annular mass segment 9.
  • the Ringmassesegment 9 goes over at its radially innermost point in the annular groove. As a result, a deflection of this force takes place by the action of an axial force
  • Ring mass segment from outside to inside.
  • FIG. 2 shows a damping element from the prior art of EP 1 340 964 B1. The damping behavior of this damping element has been investigated and with the
  • FIG. 3 shows, on the basis of the spectrum S1 with the solid line oscillation spectra, the damping behavior of the arrangement of FIG. 1 in comparison with the spectrum S2 with the dashed line for the damping behavior of the arrangement of FIG. 2.
  • a useful signal A-n which is needed to determine the level or the flow, is in the spectrum S1 at about 8200 Hz. As can be seen from Fig. 3, the
  • Frequency range of the useful signal A-n for the arrangement of Fig. 1 are selected in a very wide range.
  • the frequency range of the useful signal can be selected arbitrarily in the range between 45,000 to about 120,000 Hz, without it being larger
  • Damping element 15 comes.
  • the peaks in spectrum S1 at 28,000 and at 35,000 Hz represent axial vibrations, while the peak at about 136,000 Hz represents a rotational vibration.
  • the vibration behavior of the damping element when transmitting and / or receiving an ultrasonic signal in the useful frequency range. It can be seen that predominantly the ultrasonic transducer 1, ie the electromechanical transducer elements 2 and 3 and the attachment 4 with the base 6 and the bending plate 7, are in vibration.
  • the bending plate 7 has a radial deflection A1 during operation of the ultrasonic flow device. However, this deflection A1 is not transmitted to a subsequent damping structure, but the bending plate 7 is free-swinging and is not disturbed in its radial deflection by a damping structure. As a result, the radiated ultrasound signal is transmitted to the medium particularly well and unhindered.
  • Fig. 5 shows the vibration behavior of the arrangement according to the invention in the illustrated embodiment of FIG. 1 in the state of natural frequency A-a2 (axial mode at about 35000 Hz.).
  • the annular mass segment 1 1 performs an axial movement between the two parallel annular grooves 10 and 12.
  • Ringmassesegments 11 there is a temporary material wall deformation in the region of the annular grooves 10 and 12 in the form of a temporary thinning or thickening.
  • Fig. 6 shows the vibration behavior of the arrangement according to the invention in the illustrated embodiment of FIG. 1 in the state of natural frequency A-r1 (rotation mode at about 137000 Hz.).
  • the annular mass segment 1 1 carries out a rotational movement between the two parallel annular grooves 10 and 12. Due to the oscillatory movement of the annular segment 11, there is a temporary material wall deformation in the region of the annular grooves 10 and 12 in the form of a wave-shaped bending of the material wall.
  • FIG. 1 The embodiment variant shown in FIG. 1 can also be further modified within the scope of the invention. So is a prismatic instead of a cylindrical basic structure
  • Basic structure preferably possible with uniform prism surfaces. Even individual segments of the basic structure, so in particular the ring mass segment 1 1, in the
  • the damping element and the attachment are rotationally symmetrical and consist of metal.
  • the attachment may preferably consist of stainless steel or titanium.
  • the damping element is made

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measuring Volume Flow (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

L'invention concerne un dispositif comprenant un transducteur ultrasonore et un élément amortisseur avec un axe longitudinal L, ledit élément amortisseur reliant le transducteur ultrasonore à un boîtier ou une paroi de tuyau de mesure, le transducteur comprenant un élément rapporté avec une surface en contact avec le fluide, qui émet les signaux ultrasonores dans un fluide gazeux ou liquide, et l'élément amortisseur comprenant au moins deux rainures annulaires et un segment de masse annulaire intercalé, caractérisé en ce que : l'élément amortisseur possède une première fréquence propre fa à laquelle le segment de masse annulaire effectue un mouvement axial parallèlement à la direction longitudinale de l'élément amortisseur, cette première fréquence propre étant la fréquence propre maximale, dans le cas où il existe une pluralité de fréquences propres, à laquelle le segment de masse annulaire effectue un mouvement axial parallèlement à la direction longitudinale de l'élément amortisseur ; et l'élément amortisseur possède une seconde fréquence propre fr à laquelle le segment de masse annulaire effectue un mouvement de rotation, cette seconde fréquence propre étant la fréquence propre minimale, dans le cas où il existe une pluralité de fréquences propres, à laquelle le segment de masse annulaire effectue un mouvement axial parallèlement à la direction longitudinale de l'élément amortisseur, et le rapport entre la première fréquence propre fa et la seconde fréquence propre fr étant inférieur à 0,75. L'invention concerne également un appareil de terrain de la technique de mesure de processus.
EP16704442.9A 2015-03-10 2016-02-15 Dispositif et appareil de terrain de la technique de mesure de processus Active EP3268954B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015103486.7A DE102015103486A1 (de) 2015-03-10 2015-03-10 Anordnung und Feldgerät der Prozessmesstechnik
PCT/EP2016/053092 WO2016142127A1 (fr) 2015-03-10 2016-02-15 Dispositif et appareil de terrain de la technique de mesure de processus

Publications (2)

Publication Number Publication Date
EP3268954A1 true EP3268954A1 (fr) 2018-01-17
EP3268954B1 EP3268954B1 (fr) 2018-11-28

Family

ID=55357989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16704442.9A Active EP3268954B1 (fr) 2015-03-10 2016-02-15 Dispositif et appareil de terrain de la technique de mesure de processus

Country Status (5)

Country Link
US (1) US10269336B2 (fr)
EP (1) EP3268954B1 (fr)
CN (1) CN107430845B (fr)
DE (1) DE102015103486A1 (fr)
WO (1) WO2016142127A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015103486A1 (de) 2015-03-10 2016-09-15 Endress + Hauser Flowtec Ag Anordnung und Feldgerät der Prozessmesstechnik
DE102015106352A1 (de) * 2015-04-24 2016-10-27 Endress + Hauser Flowtec Ag Anordnung und Ultraschall-Durchflussmessgerät

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE289058T1 (de) * 2002-03-01 2005-02-15 Sick Engineering Gmbh Ultraschallwandleranordnung mit ultraschallfilter
DE102004047786A1 (de) * 2004-10-01 2006-04-06 Robert Bosch Gmbh Verfahren zur Pulsationskorrektur innerhalb eines einen Medienmassenstrom messenden Messgeräts
WO2008037256A2 (fr) * 2006-09-28 2008-04-03 3L-Ludvigsen A/S Scelleuse à ultrasons rotative
US8559269B2 (en) * 2008-07-02 2013-10-15 Chevron U.S.A., Inc. Device and method for generating a beam of acoustic energy from a borehole, and applications thereof
DE102008033098C5 (de) * 2008-07-15 2016-02-18 Krohne Ag Ultraschallwandler
US9504233B2 (en) * 2009-03-06 2016-11-29 Leah Stephens Electromechanical horn for deterring animals
US8387443B2 (en) * 2009-09-11 2013-03-05 The Board Of Trustees Of The University Of Illinois Microcantilever with reduced second harmonic while in contact with a surface and nano scale infrared spectrometer
DE102009046144A1 (de) * 2009-10-29 2011-05-19 Robert Bosch Gmbh Ultraschallwandler zum Einsatz in einem fluiden Medium
EP2646171B1 (fr) * 2010-12-03 2016-03-02 Research Triangle Institute Procédé de formation d'un transducteur ultrasonore, et appareil associé
DE102010064117A1 (de) * 2010-12-23 2012-06-28 Endress + Hauser Flowtec Ag Ultraschallwandler
DE102011090082A1 (de) * 2011-12-29 2013-07-04 Endress + Hauser Flowtec Ag Ultraschallwandler für ein Durchflussmessgerät
JP5919479B2 (ja) * 2012-11-08 2016-05-18 パナソニックＩｐマネジメント株式会社 超音波流量計
DE102015103486A1 (de) 2015-03-10 2016-09-15 Endress + Hauser Flowtec Ag Anordnung und Feldgerät der Prozessmesstechnik

Also Published As

Publication number Publication date
CN107430845A (zh) 2017-12-01
EP3268954B1 (fr) 2018-11-28
WO2016142127A1 (fr) 2016-09-15
DE102015103486A1 (de) 2016-09-15
US20180061390A1 (en) 2018-03-01
US10269336B2 (en) 2019-04-23
CN107430845B (zh) 2021-04-13

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