DE2235452A1 - PROCESS FOR SOUND ABSORPTION BY VOLUME CHANGING GASES - Google Patents

PROCESS FOR SOUND ABSORPTION BY VOLUME CHANGING GASES

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Publication number
DE2235452A1
DE2235452A1 DE19722235452 DE2235452A DE2235452A1 DE 2235452 A1 DE2235452 A1 DE 2235452A1 DE 19722235452 DE19722235452 DE 19722235452 DE 2235452 A DE2235452 A DE 2235452A DE 2235452 A1 DE2235452 A1 DE 2235452A1
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DE
Germany
Prior art keywords
sound absorption
gas
volume changing
pressure
gases
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.)
Pending
Application number
DE19722235452
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German (de)
Inventor
Robert Dipl Chem Freund
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19722235452 priority Critical patent/DE2235452A1/en
Publication of DE2235452A1 publication Critical patent/DE2235452A1/en
Pending legal-status Critical Current

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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
    • 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Description

Dipl.Chem. Robert Freund DiplOIng. Hanno Blackert Verfahren zur Schallabsorption durch volumenändernde Gase Im folgenden wird ein Verfahren zur Absorption von Schallwellen beschrieben. Bisher werden Schallwellen gedämpft,.Dipl. Chem. Robert Freund DiplOIng. Hanno Blackert method for sound absorption by volume-changing gases The following is a method for absorbing sound waves described. So far, sound waves are attenuated.

indem man die Schallquelle mit Glaswolle, Schaumstoff oder anderen Feststoffen umgibt. Bei einem anderen bekannten Verfahren wird die Schallquelle durch Vakuum von der Umgebung getrennte Gegenstand dieser patentschrift ist ein Verfahren zur Dämpfung von Schallwellen, das bestimmte physikalisch-chemische Eigenschaften von Gasen, auch in Mehrphasensystemen, ausnutzt.. Eine von außen einwirkende Druckänderung verursacht in einem solchen System unter bestimmten Voraussetzungen eine Gegenreaktiona so daß innerhalb des Systems Druckänderungen verhindert werden.by covering the sound source with glass wool, foam or other Surrounding solids. Another known method is the sound source The subject of this patent specification is a Process for damping sound waves, which has certain physicochemical properties of gases, also in multi-phase systems. An externally acting pressure change causes a backlash in such a system under certain conditions so that pressure changes are prevented within the system.

Folgende Systeme sind denkbar: Druckabhängige Gasgleichgewichte (1) A, B, AB und AA sind Gase; die Gleichgewichte dieser chemischen Reaktionen sind druckabhängig0 Zweiphasensysteme (Gas - Flüssigkeit oder Gas - Feststoff) (2) Der Dampfdruck von Zweipha-ensystemen ist nur von der Temperatur abhängig. Von außen einwirkenden Druckschwankungen wird durch Verdampfung oder Kondensation entgegengewirkt.The following systems are conceivable: Pressure-dependent gas equilibria (1) A, B, AB and AA are gases; the equilibria of these chemical reactions are pressure-dependent0 two-phase systems (gas - liquid or gas - solid) (2) The vapor pressure of two-phase systems is only dependent on the temperature. External pressure fluctuations are counteracted by evaporation or condensation.

Dies soll am Beispiel einer Lautsprecherbox verdeutlicht werden: Schwingungen der Membran (Abb.1) verursachen im gasdicht abgeschlossenen Gehäuse Volumenänderungen.This should be illustrated using the example of a loudspeaker box: vibrations of the membrane (Fig.1) cause volume changes in the gas-tight sealed housing.

Bei idealen Gasen (Luft) ist dies verbunden mit Druckänderungen (Schall).With ideal gases (air) this is associated with pressure changes (sound).

Zweiphasensysteme halten Jedoch unter bestimmten Bedingungen den Druck gegenüber Volumenschwankungen konstant (abb.2).However, two-phase systems hold the pressure under certain conditions constant in relation to volume fluctuations (fig. 2).

Da die oben beschriebenen Systeme Druckschwankungen ausgleichen und damit Schallwellen unterdrUcken, lassen sie sich beispielsweise anwenden 1. zur Geräuschdämpfung von lauten Maschinen, indem man diese mit einem Absorptionsraum umgibt, in dem sich ein Gas nach (1) oder ein Zweiphasensystem nach (2) befindet, oder 2. zur Verringerung des Innenreflexionfaktors von Baßlautsprecherboxen. Der dazu bei herkömmlichen Boxen benötigte relativ große Dämpfungsraum kann durch die beschriebenen Verfahren verringert werden.Since the systems described above compensate for pressure fluctuations and to suppress sound waves, they can be used, for example, 1. for Noise attenuation from loud machines by connecting them to an absorption room surrounds, in which there is a gas according to (1) or a two-phase system according to (2), or 2. to reduce the internal reflection factor of bass loudspeakers. Of the the relatively large damping space required for this in conventional boxes can be achieved by the procedures described can be reduced.

Claims (3)

Patentansprüche:Patent claims: Verfahren zur Schallabsorption dadurch gekennzeichnet, daß ein Absorptionsráum mit einem Gas gefüllt ist, in dem Reaktionen ablaufen, die sich in einem druckabhängigen chemischen Gleichgewicht befinden. Method for sound absorption, characterized in that an absorption room is filled with a gas in which reactions take place, which take place in a pressure-dependent manner chemical equilibrium. 2.) Verfahren zur Schallabsorption dadurch gekennzeichnet, daß ein Absorptionsraum mit einem Zweiphasensystem (Gas - Flüssigkeit oder Gas - Fest stoff) mit der Eigenschaft der Druckkonstanz gefüllt ist.2.) Method for sound absorption, characterized in that a Absorption room with a two-phase system (gas - liquid or gas - solid) is filled with the property of constant pressure. 3.) Verfahren zur Schallabsorption dadurch gekennzeichnet, daß die Verfahren nach Anspruch 1.) und 2.') kombiniert sind.3.) Method for sound absorption, characterized in that the Method according to claim 1.) and 2. ') are combined. L e e r s e i t eL e r s e i t e
DE19722235452 1972-07-20 1972-07-20 PROCESS FOR SOUND ABSORPTION BY VOLUME CHANGING GASES Pending DE2235452A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19722235452 DE2235452A1 (en) 1972-07-20 1972-07-20 PROCESS FOR SOUND ABSORPTION BY VOLUME CHANGING GASES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722235452 DE2235452A1 (en) 1972-07-20 1972-07-20 PROCESS FOR SOUND ABSORPTION BY VOLUME CHANGING GASES

Publications (1)

Publication Number Publication Date
DE2235452A1 true DE2235452A1 (en) 1974-01-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722235452 Pending DE2235452A1 (en) 1972-07-20 1972-07-20 PROCESS FOR SOUND ABSORPTION BY VOLUME CHANGING GASES

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Country Link
DE (1) DE2235452A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149612A (en) * 1976-07-17 1979-04-17 Messerschmitt-Boelkow-Blohm Gmbh Noise reducing resonator apparatus
FR2433217A2 (en) * 1978-08-09 1980-03-07 Messerschmitt Boelkow Blohm NOISE REDUCTION BY RESONATORS DRIVEN IN OSCILLATION
US4228869A (en) * 1976-07-17 1980-10-21 Messerschmitt-Bolkow-Blohm Gmbh Variable volume resonators using the Belleville spring principle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149612A (en) * 1976-07-17 1979-04-17 Messerschmitt-Boelkow-Blohm Gmbh Noise reducing resonator apparatus
US4228869A (en) * 1976-07-17 1980-10-21 Messerschmitt-Bolkow-Blohm Gmbh Variable volume resonators using the Belleville spring principle
FR2433217A2 (en) * 1978-08-09 1980-03-07 Messerschmitt Boelkow Blohm NOISE REDUCTION BY RESONATORS DRIVEN IN OSCILLATION

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