EP1060798A1 - Transducteur ultrasonore à piston unique - Google Patents

Transducteur ultrasonore à piston unique Download PDF

Info

Publication number
EP1060798A1
EP1060798A1 EP99810539A EP99810539A EP1060798A1 EP 1060798 A1 EP1060798 A1 EP 1060798A1 EP 99810539 A EP99810539 A EP 99810539A EP 99810539 A EP99810539 A EP 99810539A EP 1060798 A1 EP1060798 A1 EP 1060798A1
Authority
EP
European Patent Office
Prior art keywords
transducer
mass
active
recited
masses
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Withdrawn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
EP99810539A
Other languages
German (de)
English (en)
Inventor
Prokic Miodrag
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.)
Krohne Messtechnik GmbH and Co KG
Original Assignee
Miodrag Prokic
Krohne Messtechnik GmbH and Co KG
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 Miodrag Prokic, Krohne Messtechnik GmbH and Co KG filed Critical Miodrag Prokic
Priority to DE29923791U priority Critical patent/DE29923791U1/de
Priority to EP99810539A priority patent/EP1060798A1/fr
Publication of EP1060798A1 publication Critical patent/EP1060798A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency

Definitions

  • Double piston oscillating mode (axial both side contraction-extension mode) is an essential characteristic of all Prior Art transducers.
  • oscillations of central and active vibration source is directly coupled to surrounding end-metal-masses, and metal masses are performing contraction-extension, following oscillations of active transducer sources (piezoceramics, for instance), meaning that all elements of the sandwich structure of one ultrasonic transducer are oscillating in a certain contraction-extension mode (changing their lengths).
  • New and modified sandwich structure has two active vibration sources (working in opposition: one is extending, the other is contracting and vice-versa), bounded by three metal masses. This way, only the center mass is performing kind of translating, single piston vibrations, changing only its position (but not dimensions) and two end metal masses are always in stable position (without any change of their dimensions). This is possible because two active vibration stacks that are placed in between three metal masses are mutually compensating each other vibrations, meaning that one of them is in the phase of extension and the other is contracting for the same amplitude.
  • Three masses sandwich transducer, or single piston oscillating transducer (the current invention) is oscillating structure in which only center mass is performing single piston type vibrations, and end masses are not moving. Of course, there is a kind of pressure-ultrasonic-wave that is permanently travelling from one end mass to other, and vice-versa, like light beam reflecting endlessly between two stable mirrors.
  • transducer's effective stiffness coefficient S b,c is the stiffness combined of the central bolt 6 stiffness S b with all other elastic parameters S c of active vibrating elements 1, belonging to the structures presented on Fig.1(a),(b) and Fig. 2(a),(b). Because of that reason, on the Fig. 1(b),(c),(d), Fig. 2(b) and Fig.
  • Fig. 2(a) presents simple combination of two traditional transducers given on Fig.1 (described in the European patent: Gould Inc. Inventor: Thompson, Stephen, Publication number: 0 209 238, A2, int. Cl.: H 04 R 17/10, from 21.01.87. This patent is already in a public domain since its owner decided not to extend it).
  • Transducer on Fig. 2(a) gives some more flexibility and oscillating freedom to introduce different driving signals into upper and lower part of one transducer, but basically this is simple mechanical combination of two traditional (Prior Art) transducers presented on Fig. 1(a).
  • Vibrating energy 5 of a traditionally known transducer/s is radiated into external medium when (at least) one of oscillating masses 3 is in mechanical contact with external medium (acoustically coupled with external medium).
  • the biggest disadvantage of double piston transducers is in the fact that in the process of mechanical loading, acoustic parameters of external medium, and mechanical coupling with a transducer, are creating significant damping and attenuation, significantly changing the parameters of equivalent oscillatory structures given on Fig. 1(b), (c), (d) and Fig. 2(b).
  • Electroacoustic or electromechanical efficiency of double piston transducers (in any combination similar to Fig. 1(a) and Fig. 2(a)) is very much dependent on shape, size and acoustical and mechanical parameters of externally connected medium. Different and complicated design techniques for resonant and impedance matching are necessary to be applied in order to achieve optimal energy transfer from double piston transducers towards external medium (also subject of Prior Art ).
  • both active vibrating layers 1 piezoceramics or magnetostrictive material
  • the single signal source for instance ultrasonic generator, oscillator, amplifier; -see Fig. 4
  • Single piston transducers can have the nodal plane only found as an average position regarding certain time interval (during transducer operation), but it cannot be found in every time instant.
  • double piston transducers Prior Art
  • single piston transducers this Invention
  • Unbalanced mechanical momentum transducer Fig. 3(a)
  • single piston transducer (present invention) can agitate different radial, circumferential, cylindrical and transversal tube vibration modes, without the direct need of agitating longitudinal (and axial) tube modes (what is very beneficial for various liquid processing or liquid atomization, while keeping high flow rate).
  • the present invention achieves the above objects by freely placing of center mass between two piezoelectric stacks of a double piston transducer and mutually inverting electrical polarity of piezoelectric stacks in order to achieve single piston movement of a center mass.
  • Two piezoelectric stacks are electrically connected in parallel and driven by the same electrical source.
  • One of piezoelectric stacks can be replaced with an inactive ceramic stack and single piston movement of a center mass will again be maintained.
  • Figs.: 3, 4, 5, 6, 7, 8, 9, 10; -(a), (b), (c), (d) achieves unidirectional response in a double piston transducer element by including an additional mass in the center of the piezoelectric stack, and by mutually inverted electrical polarity of the two ceramic stacks thus created, consequently producing single piston movement of the center mass.
  • Fig. 3(a) illustrates a double-ended transducer with an extra mass 4, which will hereafter be called the center mass, mc.
  • the center mass 4 is positioned between active transducer stacks 2' and 2" and head masses 3' and 3".
  • a single stress rod 6 compressively biases the active piezoceramic stacks 2' and 2".
  • the center mass 4 allows vibration to be exchanged between the stacks 2' and 2" and between the masses 3' and 3", by performing single piston movement in the same time.
  • the two head masses 3' and 3" (Fig. 3(a)) may be of identical construction as in the case for the head masses 3 of the prior art device (see Fig. 1(a) and Fig. 2(a)), or they may be different to provide differing radiation properties to the two sides of the device.
  • the two active elements 2' and 2" may be identical materials or they may be different to tailor the response in the two directions.
  • the active transducer elements 1' and 1" can be piezoelectric elements manufactured from a piezoelectric ceramic material, such as a lead zirconate titanate formulation, or magnetostrictive elements in an functionally equivalent configuration, or at least one stack element should be made from active transducer material, and the other can be replaced with inactive ceramic material.
  • FIG. 3(b) The simplified mechanical equivalent circuit representation for the transducer of Fig. 3(a) is shown in Fig. 3(b).
  • This circuit includes two active piezoelectric stacks 2' and 2" (or one piezoelectric stack and the other inactive ceramic stack), each of which is represented by its stiffness coefficient S c (or S c ' and S c ", respectively), and the stress rod 6 represented by its stiffness coefficient S b .
  • Fig.4 shows a representative configuration for the transducer (current invention) and single driving electronics to provide the performance possibilities discussed above.
  • This figure shows an electrical signal generator 8 which provides the system input. Since the center mass 4, 4', 4" (Figs. 3, 4, 5, 6, 7, 8, 9, 10) has certain inertia, it is clear that input electrical signal into transducer and produced acoustic waves inside of transducer structure will have different oscillatory speeds in comparison with the oscillatory speed of center mass 4.
  • Fig. 5 and Fig. 6 are examples of the mechanical fixation to external medium 7, and use of the new device as an emitting transducer or receiving sensor.
  • Fig. 7 and Fig. 8 are two more examples of mechanical fixation of the transducer directly to external medium 7, eliminating the front emitting mass 3' (Fig. 7), or transforming front emitting mass 3' into amplifying sonotrode (Fig. 8).
  • Fig. 7 also presents mechanical coupling arrangement when emitting energy of transducer should penetrate thick metal mass and irradiate active external medium 7.
  • the extended single piston transducer structure presents two examples of the transducers made by connection of two single piston transducers presented on Fig. 3(a), on the same way as Fig. 2(a) presents extended structure made by connection between two transducers presented on Fig. 1(a), in order to produce high power and multiple driving options transducers. Similar extended structure/s can be produced connecting (in line) several of single piston transducers.
  • An additional alternative embodiment of the present invention can achieve further performance enhancement in some applications by providing somewhat different dimensions and/or materials for the left and right transducer elements. Modifications of this type could allow the rightward and leftward radiation to be optimized for somewhat different operating frequency bands, and thus increase the total operating bandwidth of the transmitting system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP99810539A 1999-06-18 1999-06-18 Transducteur ultrasonore à piston unique Withdrawn EP1060798A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE29923791U DE29923791U1 (de) 1999-06-18 1999-06-18 Unidirektionaler Einkolben-Ultraschalltransducer
EP99810539A EP1060798A1 (fr) 1999-06-18 1999-06-18 Transducteur ultrasonore à piston unique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99810539A EP1060798A1 (fr) 1999-06-18 1999-06-18 Transducteur ultrasonore à piston unique

Publications (1)

Publication Number Publication Date
EP1060798A1 true EP1060798A1 (fr) 2000-12-20

Family

ID=8242884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99810539A Withdrawn EP1060798A1 (fr) 1999-06-18 1999-06-18 Transducteur ultrasonore à piston unique

Country Status (1)

Country Link
EP (1) EP1060798A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10302089B3 (de) * 2003-01-17 2004-10-14 Hilti Ag Schlagende Elektrohandwerkzeugmaschine mit einem Piezoaktor
US7309279B2 (en) 2001-05-16 2007-12-18 Sanmina-Sci Corporation Cooling airflow distribution device
RU2452586C1 (ru) * 2011-02-22 2012-06-10 Общество с ограниченной ответственностью "УльтраТехМаш" Ультразвуковой пьезокерамический преобразователь
US8574336B2 (en) 2010-04-09 2013-11-05 Southwire Company Ultrasonic degassing of molten metals
US8652397B2 (en) 2010-04-09 2014-02-18 Southwire Company Ultrasonic device with integrated gas delivery system
US8844897B2 (en) 2008-03-05 2014-09-30 Southwire Company, Llc Niobium as a protective barrier in molten metals
US9528167B2 (en) 2013-11-18 2016-12-27 Southwire Company, Llc Ultrasonic probes with gas outlets for degassing of molten metals
WO2017039964A1 (fr) * 2015-09-04 2017-03-09 Motorola Solutions, Inc. Émetteur ultrasonore
EP3243572A1 (fr) * 2016-05-10 2017-11-15 Honda Electronics Co., Ltd. Dispositif de détection de vitesse d'oscillation
CN108311361A (zh) * 2018-03-26 2018-07-24 浙江大学 具有特定模态振型的微机电压电超声波换能器
US10052714B2 (en) 2016-10-14 2018-08-21 Sonics & Materials, Inc. Ultrasonic welding device with dual converters
US10233515B1 (en) 2015-08-14 2019-03-19 Southwire Company, Llc Metal treatment station for use with ultrasonic degassing system
EP4000763A1 (fr) 2020-11-20 2022-05-25 MP Interconsulting Atomiseur de poudre de metal a ultrasons

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1487203A (en) * 1975-02-21 1977-09-28 Nat Res Dev Vibration monitors
EP0209238A2 (fr) * 1985-06-14 1987-01-21 Gould Inc. Transducteur acoustique à double piston dont on peut choisir la directivité
FR2641612A1 (fr) * 1989-01-06 1990-07-13 Thomson Csf Capteur acoustique integre de pression et d'acceleration
US5047683A (en) * 1990-05-09 1991-09-10 Image Acoustics, Inc. Hybrid transducer
US5363345A (en) * 1988-05-05 1994-11-08 L'etat Francais Represente Par . . . Le Delegue Ministerial Pour L'armement Process and electro-acoustic transducers for transmitting low-frequency acoustic waves in a liquid
US5483502A (en) * 1993-12-03 1996-01-09 Etat Francais Represente Par Le Delegue General Pour L'armement Method and apparatus for emitting high power acoustic waves using transducers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1487203A (en) * 1975-02-21 1977-09-28 Nat Res Dev Vibration monitors
EP0209238A2 (fr) * 1985-06-14 1987-01-21 Gould Inc. Transducteur acoustique à double piston dont on peut choisir la directivité
US5363345A (en) * 1988-05-05 1994-11-08 L'etat Francais Represente Par . . . Le Delegue Ministerial Pour L'armement Process and electro-acoustic transducers for transmitting low-frequency acoustic waves in a liquid
FR2641612A1 (fr) * 1989-01-06 1990-07-13 Thomson Csf Capteur acoustique integre de pression et d'acceleration
US5047683A (en) * 1990-05-09 1991-09-10 Image Acoustics, Inc. Hybrid transducer
US5483502A (en) * 1993-12-03 1996-01-09 Etat Francais Represente Par Le Delegue General Pour L'armement Method and apparatus for emitting high power acoustic waves using transducers

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7309279B2 (en) 2001-05-16 2007-12-18 Sanmina-Sci Corporation Cooling airflow distribution device
DE10302089B3 (de) * 2003-01-17 2004-10-14 Hilti Ag Schlagende Elektrohandwerkzeugmaschine mit einem Piezoaktor
US8844897B2 (en) 2008-03-05 2014-09-30 Southwire Company, Llc Niobium as a protective barrier in molten metals
US9327347B2 (en) 2008-03-05 2016-05-03 Southwire Company, Llc Niobium as a protective barrier in molten metals
US9617617B2 (en) 2010-04-09 2017-04-11 Southwire Company, Llc Ultrasonic degassing of molten metals
US8574336B2 (en) 2010-04-09 2013-11-05 Southwire Company Ultrasonic degassing of molten metals
US9382598B2 (en) 2010-04-09 2016-07-05 Southwire Company, Llc Ultrasonic device with integrated gas delivery system
US8652397B2 (en) 2010-04-09 2014-02-18 Southwire Company Ultrasonic device with integrated gas delivery system
US10640846B2 (en) 2010-04-09 2020-05-05 Southwire Company, Llc Ultrasonic degassing of molten metals
RU2452586C1 (ru) * 2011-02-22 2012-06-10 Общество с ограниченной ответственностью "УльтраТехМаш" Ультразвуковой пьезокерамический преобразователь
US9528167B2 (en) 2013-11-18 2016-12-27 Southwire Company, Llc Ultrasonic probes with gas outlets for degassing of molten metals
US10316387B2 (en) 2013-11-18 2019-06-11 Southwire Company, Llc Ultrasonic probes with gas outlets for degassing of molten metals
US10233515B1 (en) 2015-08-14 2019-03-19 Southwire Company, Llc Metal treatment station for use with ultrasonic degassing system
WO2017039964A1 (fr) * 2015-09-04 2017-03-09 Motorola Solutions, Inc. Émetteur ultrasonore
US10065212B2 (en) 2015-09-04 2018-09-04 Motorola Solutions, Inc. Ultrasonic transmitter
GB2556300A (en) * 2015-09-04 2018-05-23 Motorola Solutions Inc Ultrasonic transmitter
GB2556300B (en) * 2015-09-04 2021-10-20 Motorola Solutions Inc Ultrasonic transmitter
EP3243572A1 (fr) * 2016-05-10 2017-11-15 Honda Electronics Co., Ltd. Dispositif de détection de vitesse d'oscillation
US10052714B2 (en) 2016-10-14 2018-08-21 Sonics & Materials, Inc. Ultrasonic welding device with dual converters
CN108311361A (zh) * 2018-03-26 2018-07-24 浙江大学 具有特定模态振型的微机电压电超声波换能器
EP4000763A1 (fr) 2020-11-20 2022-05-25 MP Interconsulting Atomiseur de poudre de metal a ultrasons

Similar Documents

Publication Publication Date Title
US5959939A (en) Electrodynamic driving means for acoustic emitters
US5757726A (en) Flextensional acoustic source for offshore seismic exploration
EP0826157B1 (fr) Moyens d'excitation pour emetteurs acoustiques
EP1060798A1 (fr) Transducteur ultrasonore à piston unique
US3400892A (en) Resonant vibratory apparatus
US7555133B2 (en) Electro-acoustic transducer
US4757227A (en) Transducer for producing sound of very high intensity
Larson et al. State switched transducers: A new approach to high-power, low-frequency, underwater projectors
AU4449200A (en) Ultrasonic transducer with improved compressive loading
US6950373B2 (en) Multiply resonant wideband transducer apparatus
US20220066557A1 (en) Piezoelectric actuators with increased deformation
US6353277B1 (en) Acoustic transducer
JPS6022478A (ja) 超音波リニアモータ
EP0209238A2 (fr) Transducteur acoustique à double piston dont on peut choisir la directivité
US8072843B1 (en) Stepped multiply resonant wideband transducer apparatus
US7679266B2 (en) Longitudinally driven slotted cylinder transducer
US6298012B1 (en) Doubly resonant push-pull flextensional
US7535801B1 (en) Multiple frequency sonar transducer
Zhang et al. Transverse resonance orthogonal beam (TROB) mode for broadband underwater sound generation
JPH0223070A (ja) リニア型超音波モータ
WO2006116508A2 (fr) Transducteur ultrasonique haute puissance
KR102159856B1 (ko) 큰 복사 면적을 가지는 초음파 장치
JP3200315B2 (ja) 振動アクチュエータ
JPS602082A (ja) 超音波振動を利用した直進駆動装置
JP2874174B2 (ja) 超音波振動子及び超音波モータ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB LI NL

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20010618

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: KROHNE MESSTECHNIK GMBH & CO. KG

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KROHNE MESSTECHNIK GMBH & CO. KG

AKX Designation fees paid

Free format text: AT BE CH DK ES FI FR LI

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PROKIC, MIODRAG

RBV Designated contracting states (corrected)

Designated state(s): AT BE CH DE DK ES FI FR GB LI NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20030103