WO1991005331A1 - Unite electro-acoustique pour la production de hautes intensites soniques et ultra-soniques dans des gaz et des interphases - Google Patents

Unite electro-acoustique pour la production de hautes intensites soniques et ultra-soniques dans des gaz et des interphases Download PDF

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Publication number
WO1991005331A1
WO1991005331A1 PCT/ES1990/000033 ES9000033W WO9105331A1 WO 1991005331 A1 WO1991005331 A1 WO 1991005331A1 ES 9000033 W ES9000033 W ES 9000033W WO 9105331 A1 WO9105331 A1 WO 9105331A1
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WO
WIPO (PCT)
Prior art keywords
equipment according
previous
electroacoustic equipment
load
electroacoustic
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.)
Ceased
Application number
PCT/ES1990/000033
Other languages
English (en)
Spanish (es)
Inventor
Juan Antonio Gallego Juarez
Germán RODRIGUEZ CORRAL
José Luis SAN EMETERIO PRIETO
Fausto Montoya Vitini
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.)
Consejo Superior de Investigaciones Cientificas CSIC
Original Assignee
Consejo Superior de Investigaciones Cientificas CSIC
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 Consejo Superior de Investigaciones Cientificas CSIC filed Critical Consejo Superior de Investigaciones Cientificas CSIC
Priority to DE69011085T priority Critical patent/DE69011085T2/de
Priority to EP19900915472 priority patent/EP0450030B1/fr
Publication of WO1991005331A1 publication Critical patent/WO1991005331A1/fr
Anticipated expiration legal-status Critical
Priority to US08/006,040 priority patent/US5299175A/en
Ceased legal-status Critical Current

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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
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B3/04—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving focusing or reflecting
    • 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
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0253—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken directly from the generator circuit
    • 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
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general

Definitions

  • the object of this patent is an electroacoustic equipment for the efficient generation of high acoustic intensities in gaseous media and at interfaces (gas-solid, gas-liquid).
  • Aerodynamic systems such as whistles and sirens, in which energy is supplied by a gas stream.
  • the acoustic powers achieved with these systems can be high, however the yields that are obtained are generally low, the acoustic signals emitted are complex and present difficulties in reaching ultrasonic frequencies. Aerodynamic systems also have the disadvantage that, together with acoustic radiation, a large amount of gas from the emitter is propagated.
  • ac ⁇ high intensity acoustic wave generators are electromagnetic, magnetostrictive or piezoelectric, working with solid emitters vibrating longitudinally with which, they present notable limitations in geography (to avoid transverse modes), as well as to achieve high yields and high displacements .
  • the most recent attempts try to use flat radiators vibrating flexurally. This allows to increase the radiant surface, increasing the radiation intensity (which is proportional to the surface of the radiator), and achieving high displacements.
  • the great problem of these systems comes from the phase cancellation that occurs due to the zones that vibrate in contraphase on both sides of a nodal line.
  • the present invention relates to equipment Electroacoustic consisting of a transduction system and its electronic power device.
  • the radiating element is of the flexional type but has a discontinuous profile structure.
  • it is possible to modify the amplitude of the vibration and the phase of the radiation so that all the vibrant zones contribute directly to the construction of the acoustic field with a configuration that can be previously established.
  • two different configurations of the acoustic field can be obtained, in correspondence with the different profile of each of its faces.
  • prototypes for frequencies of approximately 20 KHz have been developed with which, with a single transducer, a directional field of a beam width (at 3 dB) less than 3 degrees is achieved by one of the faces of the radiating element, and a field strongly focused on an axial cylindrical volume about 10 cm long and less than 2 c wide on the other side.
  • Figure 1 presents the directivity diagram of the transducer radiating from its directional face
  • Figure 2 shows the axial and transverse distribution (in focus) of the acoustic field emitted by the focusing face.
  • P represents the amplitude of the acoustic pressure in relative units and D the distance in centimeters.
  • the transduction system ( Figure 3) is essentially constituted by a transduction element (1), which can be piezoelectric or magnetostrictive, a mechanical vibration amplifier (2), which can be exponentially, stepped, conical or catenoidal, and a plate-shaped radiator with a discontinuous profile on both sides (3).
  • the longitudinal vibration generated by the transduction element and amplified by the mechanical amplifier serves to excite the radiating element in one of its flexural modes.
  • the radiating element can have any geometric shape and vibrate in any of its vibration modes.
  • the discontinuous profile is obtained by displacing, in the direction perpendicular to the middle plane of the element, the internodal areas that are considered necessary.
  • the obtaining of directional fields is achieved by alternately displacing the internodal crowns in half a wavelength of the radiation in the middle, in order to phase the entire beam.
  • the focused fields are obtained by displacing the internal crowns so that the distance from the center of said zones to the focal point is such that the radiation arrives in phase at said point located in the near field of the radiator. It is evident that by varying the length of displacement of the internal crowns suitably, virtually any desired distribution of the acoustic field can be achieved.
  • radiators with double discontinuous profile apart from the utility of having two configurations of the acoustic field, favors in lines
  • mass distribution results from mass distribution.
  • This translates into a greater power capacity of transducer systems that, in the structure presented here, is given by the maximum amplitude of vibration that can develop the radius without breaking.
  • the radiators presented here must be constructed of metals or metal alloys that, with those of titanium, have good vibratory characteristics with high mechanical resistance.
  • the three basic parts that constitute it have to be well tuned to the working frequency.
  • the system is highly resonant and, given that due to the conditions of the medium or heating, the frequency may vary over time, an electronic excitation device with very specific requirements is required.
  • the generator system in addition to producing at each moment a signal whose frequency is within a very narrow band (corresponding to the resonance range of the emitter used), is able to automatically correct the value of said frequency by adapting it to the slippage produced in the emitter resonance band, as the reactive mechanical load associated with it varies for different conditions of the radiated medium and the emitting device itself.
  • Ultrasonic transducer by means of a tuned bridge circuit, a phase shifter, a limiter, and a bandpass filter. These types of systems have a fairly critical behavior, especially in the initial moments of the emission, also specifying the use of components
  • the generator object of the present patent introduces a new procedure for monitoring the frequency of
  • the procedure is based on the fact that a piezoelectric sonic or ultrasonic emitter has a
  • Sonic and ultrasonic transducers also show considerable resistance variations depending on the temperature of the ceramic, which changes widely during operation due to heating.
  • the system described also incorporates a circuit for measuring the power delivered by the transducer to its load and stabilization.
  • the generator system consists of the following fundamental steps: a) An impedance transformer that reduces the impedance of the transducer to 50 ⁇ . b) A compensation reactance of the parasitic capacity of the transducer. c) A power amplifier suitable for requiring 50 ⁇ loads. d) A channel for taking a sample of the current signal in the load. e) A channel for taking a sample of the output voltage of the power amplifier. f) A PLL (Phase Looked Loop) circuit for generating the power amplifier exciter signal, with a frequency equal to the transducer resonance frequency. g) A circuit measuring the power delivered to the load, h) A circuit controlling the power delivered to the load.
  • each of these stages is described individually as well as their interrelation: a)
  • the IT transformer is much wider in band than the resonance frequency range in which the transducer moves, introducing a negligible offset.
  • the transformation ratio is such that the impedance of the primary is 50 ⁇ , when loaded with the cold transducer.
  • the 50 ⁇ impedance has been chosen to be able to adapt to the impedance of ordinary 50 ⁇ transmission lines, which will link the transformer and the amplifier.
  • the main ones are far from each other, and therefore they need to be joined by an adapted transmission line.
  • the compensation reactance Ll resonates at the working frequency of the transducer with the parasitic electrical capacity of the transducer, compensating for the damaging offset that it could introduce.
  • the power amplifier is capable of delivering appropriate power to each application. Its design is common must be adapted to require 50 ⁇ loads. The offset entered between the input and output signals must be null.
  • the channel for taking a sample of the current d signal in the load is formed by the resistance Rl qu that is in series with the amplifier load and that e of a value well below 50 ⁇ , so that no appreciably modifying the load impedance and the voltage that appears in its bums is proportional to the current d in the load. The signal obtained serves both for frequency control and for power control.
  • the channel for taking a sample of the output voltage of the power amplifier is formed by a voltage divider that takes a small fraction of it, built with resistors R2 and R3. The signal obtained is used for power control.
  • the PLL (Phase Looked Loop) circuit is of the cobus type. It is composed of a VCO (Voltage controlled oscillator), a four quadrant multiplier acting as a MI phase comparator and a low pass filter, formed by the resistor R6 and the capacitor C3.
  • the VCO has two outputs, one square waveform to attack the phase comparator and another sine waveform to attack the amplifier, both outputs are set in ⁇ / 2 radians.
  • the other phase comparator input is the output current sample signal.
  • the phase comparator is a four quadrant multiplier, so that the PLL is deceived in the frequency at which the phase difference between the two inputs is ⁇ / 2, as the phase difference between the two outputs of the VCO is also ⁇ / 2 it turns out that the phase at which the voltage and current at the output of the power amplifier is 0 will be maintained.
  • the central working frequency of the VCO is regulated by the resistor R4 and the capacitor Cl.
  • the measuring circuit of the power delivered to the load is formed by a multiplier of four quadrants M2 whose inputs are the voltage and current samples taken at the output of the power amplifier, the product signal is filtered low through resistance R5 and the capacitor C2 so that the output of the filter is proportional to the effective power in the load, h)
  • the control circuit of the power input to the load is formed by a COM ⁇ comparator and a mul four-quadrant M3 typifier, operating as a voltage-controlled attenuator.
  • the comparator finds the difference in magnitude between the effective power in the load and a reference signal REF, the difference between them serves to control -Il ⁇
  • Fig 4.- General block diagram of the electronic generator. It includes the stages of transformation, power amplification, generation, automatic frequency control and power control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

Nouvelle unité électro-acoustique permettant de produire efficacement des intensités soniques et ultrasoniques élevées dans des milieux gazeux et dans des interphases (gaz-solide, gaz-liquide). Cette unité est constituée d'un système électromécanique de transduction dont l'élément radiant est une plaque (3) ayant un profil discontinu et d'un dispositif électronique pour la production régulée du signal de puissance électrique. L'unité est capable de produire des champs acoustiques de très haute intensité avec une configuration prédéterminée. En particulier, cette unité est capable de produire avec un même système transducteur deux configurations distinctes du champ acoustique. Des prototypes pour produire des champs directionnels et focalisés ont été développés.
PCT/ES1990/000033 1989-10-06 1990-10-03 Unite electro-acoustique pour la production de hautes intensites soniques et ultra-soniques dans des gaz et des interphases Ceased WO1991005331A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69011085T DE69011085T2 (de) 1989-10-06 1990-10-03 Elektroakustische einheit zur erregung von hochintensitätsschall und -ultraschall in gasen und zwischenphasen.
EP19900915472 EP0450030B1 (fr) 1989-10-06 1990-10-03 Unite electro-acoustique pour la production de hautes intensites soniques et ultra-soniques dans des gaz et des interphases
US08/006,040 US5299175A (en) 1989-10-06 1993-01-19 Electroacoustic unit for generating high sonic and ultra-sonic intensities in gases and interphases

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES8903371A ES2017285A6 (es) 1989-10-06 1989-10-06 Equipo electroacustico para la generacion de altas intensidades sonicas y ultrasonicas en gases e interfases.
ES8903371 1989-10-06

Publications (1)

Publication Number Publication Date
WO1991005331A1 true WO1991005331A1 (fr) 1991-04-18

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PCT/ES1990/000033 Ceased WO1991005331A1 (fr) 1989-10-06 1990-10-03 Unite electro-acoustique pour la production de hautes intensites soniques et ultra-soniques dans des gaz et des interphases

Country Status (5)

Country Link
AT (1) ATE109297T1 (fr)
CA (1) CA2042575C (fr)
DE (1) DE69011085T2 (fr)
ES (1) ES2017285A6 (fr)
WO (1) WO1991005331A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0543685A1 (fr) * 1991-10-07 1993-05-26 Sollac Procédé et dispositif de décapage des rives d'une tôle laminee à chaud
DE4418830A1 (de) * 1994-05-30 1995-12-07 Sonident Anstalt Verfahren und Vorrichtung zur Herstellung von Kugelwellen im Ultraschallbereich
US5828627A (en) * 1994-05-30 1998-10-27 Sonident Anstalt Liechtensteinischen Rechts Method of and apparatus for producing spherical waves in the ultrasonic range

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012676A1 (fr) * 2005-07-27 2007-02-01 Consejo Superior De Investigaciones Científicas Generateur de sons et d'ultrasons haute intensite, destine au demoussage industriel de liquides par voie aerienne
RU2744826C1 (ru) * 2020-03-24 2021-03-16 федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный технический университет им. И.И. Ползунова" (АлтГТУ) Пьезоэлектрическая колебательная система для ультразвукового воздействия на газовые среды

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986002058A1 (fr) * 1984-10-05 1986-04-10 Bruno Pross Dispositif de commande de systemes oscillants a entrainement magnetique de la masse
US4779243A (en) * 1987-03-17 1988-10-18 Honeywell, Inc. Transducer array velocity sensor and processor system
EP0327486A2 (fr) * 1988-02-05 1989-08-09 Consejo Superior De Investigaciones Cientificas Radiateur à haute intensité pour son ou ultrason focalisé employé dans des fluides
US4868445A (en) * 1988-06-20 1989-09-19 Wand Saul N Self tuned ultrasonic generator system having wide frequency range and high efficiency

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986002058A1 (fr) * 1984-10-05 1986-04-10 Bruno Pross Dispositif de commande de systemes oscillants a entrainement magnetique de la masse
US4779243A (en) * 1987-03-17 1988-10-18 Honeywell, Inc. Transducer array velocity sensor and processor system
EP0327486A2 (fr) * 1988-02-05 1989-08-09 Consejo Superior De Investigaciones Cientificas Radiateur à haute intensité pour son ou ultrason focalisé employé dans des fluides
US4868445A (en) * 1988-06-20 1989-09-19 Wand Saul N Self tuned ultrasonic generator system having wide frequency range and high efficiency

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Ultrasonics International 85, London, 2-4 Julio 1985, Conference Proceedings, G. Rodriguez et al.: "High power ultra-sonic equipment for industrial defoaming", paginas 506-511 *
Ultrasonics International 87, London, 6-9 Julio 1987, Conference Proceedings, G. Rodriguez-Corral et al.: "Focused high-power ultrasonic transducer with stepped-plate radiator for industrial application in gases", paginas 794-799 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0543685A1 (fr) * 1991-10-07 1993-05-26 Sollac Procédé et dispositif de décapage des rives d'une tôle laminee à chaud
DE4418830A1 (de) * 1994-05-30 1995-12-07 Sonident Anstalt Verfahren und Vorrichtung zur Herstellung von Kugelwellen im Ultraschallbereich
US5828627A (en) * 1994-05-30 1998-10-27 Sonident Anstalt Liechtensteinischen Rechts Method of and apparatus for producing spherical waves in the ultrasonic range
DE4418830C2 (de) * 1994-05-30 1999-04-08 Sonident Anstalt Verfahren und Vorrichtung zur Herstellung von Kugelwellen im Ultraschallbereich

Also Published As

Publication number Publication date
ATE109297T1 (de) 1994-08-15
DE69011085D1 (de) 1994-09-01
CA2042575C (fr) 1995-08-08
ES2017285A6 (es) 1991-01-16
DE69011085T2 (de) 1995-03-23

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