EP1432595A1 - Tete de transducteur acoustique, transducteur acoustique pourvu de cette tete et procede de transduction acoustique, en particulier pour un vehicule automobile - Google Patents

Tete de transducteur acoustique, transducteur acoustique pourvu de cette tete et procede de transduction acoustique, en particulier pour un vehicule automobile

Info

Publication number
EP1432595A1
EP1432595A1 EP02777258A EP02777258A EP1432595A1 EP 1432595 A1 EP1432595 A1 EP 1432595A1 EP 02777258 A EP02777258 A EP 02777258A EP 02777258 A EP02777258 A EP 02777258A EP 1432595 A1 EP1432595 A1 EP 1432595A1
Authority
EP
European Patent Office
Prior art keywords
pulsation
transducer head
conversion element
head according
housing
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
EP02777258A
Other languages
German (de)
English (en)
Other versions
EP1432595B1 (fr
Inventor
Anton Wolf
Josef Hohmann
Ralph Sticher
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.)
Woco Industrietechnik GmbH
Original Assignee
Woco Franz Josef Wolf and Co GmbH
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 Woco Franz Josef Wolf and Co GmbH filed Critical Woco Franz Josef Wolf and Co GmbH
Publication of EP1432595A1 publication Critical patent/EP1432595A1/fr
Application granted granted Critical
Publication of EP1432595B1 publication Critical patent/EP1432595B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
    • 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
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
    • G10K9/04—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated by compressed gases, e.g. compressed air

Definitions

  • the present invention relates to a sound transducer head, with at least one inlet opening for a supply line, at least a first pulsation conversion element and at least one sound radiation area in a housing, and a sound transducer in an exhaust gas and / or intake area of an internal combustion engine, in particular a motor vehicle, with such a sound transducer head , and a method for sound conversion.
  • a generic transducer head is known as part of a sound transmission device for a motor vehicle.
  • the sound transmission device ensures that targeted sound transmission from an intake tract of an internal combustion engine of a motor vehicle to an interior of the motor vehicle is achieved.
  • a transmission body which comprises a ⁇ / 2 resonator.
  • the output side of this ⁇ / 2 resonator is preferably closed with a membrane.
  • DE 100 15 697 by the applicant describes a sound transducer for exhaust gas pulsations.
  • This sound transducer is assigned to the exhaust system of an internal combustion engine, in particular a motor vehicle, and comprises a generic sound transducer head, via which, based on the exhaust gas pulsations, airborne noise can be radiated at least into the space of the internal combustion engine.
  • This transducer head can have different geometries and comprises a membrane.
  • a disadvantage of the generic sound transducer heads is that at high static air pressures within the transducer head, a tension of the membrane occurs and sound radiation can thus be impeded.
  • Double-membrane systems are known for condenser microphones, see DE 197 15 365 AI.
  • a corresponding condenser microphone comprises a first membrane, which is coupled to a counter electrode for sensing vibrations of the first membrane, and a second membrane above the first membrane, through which effective protection against the penetration of sweat into the microphone is to be achieved.
  • a disadvantage of this condenser microphone is that the distance between the two membranes must be kept very small in order to achieve a sufficient transmission effect from the second to the first membrane.
  • the object of the present invention is therefore to further develop the generic sound transducer head in such a way that the disadvantages of the prior art are overcome, in particular in the largest possible pressure ranges, an optimized sound radiation is made possible.
  • an essentially airtight partition by means of which the housing is divided into at least two sections, a first section being operatively connected to the inlet opening and the second section being connected to the sound radiation area, the first pulsation conversion element in the first section is arranged and divides the same into a first chamber and a second chamber, a pressure compensation device between the first chamber and the second chamber, a second pulsation conversion element, which is arranged at least partially movably at least partially in the second section, and a transmission device between the first and second Section for transmitting vibrations of the first pulsation conversion element to the second pulsation conversion element is present.
  • the first pulsation conversion element comprises at least one first membrane.
  • the first pulsation conversion element comprises at least one piston, preferably cup-shaped, which is movably mounted at least in some areas in the first section and / or comprises a disk which is at least partially movably mounted in the first section, the first section preferably essentially at least in the area of the piston and / or the disc is cylindrical and / or the first section has, at least in some areas, a smaller cross-sectional area than the second section.
  • the pressure compensation device comprises at least one connection opening in the first pulsation conversion element, in a connection element that is operatively connected to the first pulsation conversion element and the transmission device and / or between the first pulsation conversion element and the housing and / or in a bypass.
  • the pressure compensation device comprises at least one damping element, preferably one which is adjustable in terms of its damping properties, in particular in the form of a variable reduction in cross section, a labyrinth and / or a porous material such as foam, iron wool and / or the like.
  • the geometric dimensions of the first section, in particular the first chamber and / or second chamber, the inlet opening, the supply line and / or the second section, in particular the sound radiation area can be changed, preferably during operation of the transducer head. are.
  • the sound radiation area is essentially horn-shaped.
  • the invention is also characterized in that the second pulsation conversion element has at least one second membrane and / or a sound radiation disk connected to a flexible separating disk, which in each case divides or sub-divides the second section into a third chamber and a fourth chamber, and / or at least one structure-borne noise generator , in particular comprising a plunger, for mechanical excitation of a body arranged at least partially in the sound radiation area, in particular surrounded by the housing.
  • the housing is constructed in several parts, the individual housing parts preferably different materials, such as plastic and / or metal, preferably aluminum.
  • first diaphragm can be fastened between a first housing part and a second housing part or that the housing is formed by a second housing part in the region of the dividing wall and in the region of the piston and / or the disk.
  • the second membrane and / or the cutting disc can preferably be fastened between a third housing part and a fourth housing part, the first and fourth housing parts preferably being formed in one.
  • the invention is characterized, for example, in that the transmission device comprises at least one, in particular rigid coupling element, mechanical coupling element, electromechanical coupling element, electromagnetic coupling element and / or magnetomechanical coupling element and / or at least one positioning device, the coupling element being detachably attachable.
  • At least one sealing device preferably in the form of a simer ring, for mounting and implementing the coupling element.
  • the coupling element comprises at least one, preferably electromagnetic, scanning device for scanning the vibrations of the first pulsation conversion element and / or one, preferably electromagnetic, drive device for driving the second pulsation conversion element.
  • the scanning device and / or the drive device is or are arranged stationary relative to the housing and / or the partition.
  • the scanning device comprises at least one pulsation body, preferably movable relative to the housing
  • the drive device comprises at least one drive body, preferably movable relative to the housing, preferably the pulsation body and the drive body via at least one ner-binding device if necessary are securely coupled with each other.
  • the housing has permanent magnetization at least in the area of the pulsation body and / or the drive body and the pulsation body and / or the drive body comprises or comprise at least one first coil, or at least in the area of the pulsation body and / or the drive body is arranged at least one second coil which is stationary relative to the housing and the pulsation body and / or the drive body has or have permanent magnetization at least in some areas.
  • the connecting device has a coupling rod rigidly connected to or encompassed by the pulsation body or the drive body, the drive body or the pulsation body either being mounted so as to be freely movable relative to the coupling rod or safe to take with it when the transducer head is in operation is connected to the coupling rod.
  • the secure connection between the coupling rod on the one hand and the drive body or the pulsation body on the other hand takes place electromagnetically and / or mechanically.
  • the coupling rod has permanent magnetization at least in the area of the drive body or the pulsation body and the drive body or pulsation body in the area of the coupling bar comprises or comprise at least a third coil, or the coupling bar at least in the area of the drive body or the pulsation body comprises at least a fourth coil and the drive body or the pulsation body has or have permanent magnetization in the region of the coupling rod.
  • the coupling rod at least in the area of the drive body or the pulsation body and / or the drive body or the pulsation body in the area of the coupling bar, has a device for increasing the static friction resistance between the coupling bar on the one hand and the drive body or the pulsation body on the other hand, preferably in the form of at least one control and / or regulable claw device and / or, at least one element connected to the coupling rod, the drive body and / or the pulsation body, which electrically, pneumatically and / or hydraulically against the surface of the drive body, the Pulsations emotions or the coupling rod is pressed, includes.
  • the positioning device has at least one elastic element, preferably in the form of a spring element, in the first chamber, second chamber, third chamber and / or fourth chamber, in particular between the pulsation body on the one hand and the partition of the first pulsation conversion element on the other hand and / or the Partition wall on the one hand and the drive body on the other hand, can be arranged and / or controlled and / or regulated during operation of the transducer head s.
  • at least one elastic element preferably in the form of a spring element, in the first chamber, second chamber, third chamber and / or fourth chamber, in particular between the pulsation body on the one hand and the partition of the first pulsation conversion element on the other hand and / or the Partition wall on the one hand and the drive body on the other hand, can be arranged and / or controlled and / or regulated during operation of the transducer head s.
  • the present invention is advantageously characterized by a control and / or regulating device for controlling and / or regulating the sound radiation characteristics, in particular in operative connection with the partition, the first pulsation conversion element, the damping element, the second pulsation conversion element, a signal transmitter for at least one other the sound radiation characteristic influencing external signal and or the transmission device.
  • control and / or regulating device with the first coil or second coil, in particular for detecting movement of the pulsation body relative to the housing and / or for causing movement of the drive body relative to the housing, the third coil or the fourth Coil and / or the device for increasing the frictional resistance, in particular for the necessary secure coupling of the pulsation body and the drive body, is in operative connection.
  • control and / or regulating device is operatively connected to at least one active link, preferably a radio, engine mount, damper and / or shaker on a bulkhead, in particular for transmitting movement information of the pulsation body to the active link ,
  • the first membrane, the piston, the disc, the second membrane, the cutting disc and / or the sound radiation disc comprises or comprises an elastomer, a reinforcing fabric, a plastic, a sheet and / or a metal, preferably aluminum include.
  • first membrane, the second membrane and / or the cutting disc have or have different thicknesses, different flexibilities and / or different shapes, at least in certain areas, preferably for providing a more rigid central area and a more flexible edge area and / or in several parts is or are executed.
  • the pretension of the first membrane, the second membrane and / or the cutting disc and / or the size of at least one region of the first membrane, the second membrane and / or the cutting disc capable of vibrating, in particular during the operation of the Sonic transducer head is controllable and / or adjustable.
  • the invention also proposes a sound transducer in an exhaust gas and / or intake area of an internal combustion engine, in particular a motor vehicle, with a sound transducer head according to the invention.
  • the invention proposes a method for sound conversion, in particular in a motor vehicle, using a sound transducer head and / or sound transducer, the method being characterized by excitation, in particular by means of intake and / or exhaust gas pulsations from an internal combustion engine of a motor vehicle, one in a first section the transducer head s arranged and by means of a pressure compensation device pressure-relieved first pulsation conversion element, and Generating a movement of a second pulsation conversion element, by transmitting a movement of the first pulsation conversion element to the second pulsation conversion element by means of a transmission device.
  • the movement is transmitted through an essentially rigid connection between the first pulsation conversion element and the second pulsation conversion element.
  • the essentially rigid connection between the first pulsation conversion element and the second pulsation conversion element is established or this connection is established, preferably as a function of, via a connecting device, preferably automatically and / or manually, in particular during operation of the transducer head the frequency of the pulsations supplied to the transducer head.
  • the movement of the first pulsation conversion element is sensed by means of a scanning device, preferably electromagnetically, a movement signal is generated by the scanning device, the movement signal is processed, in particular amplified, by means of a control and / or regulating device, preferably electronically, and the second pulsation conversion element is moved as a function of the movement signal by means of a drive device.
  • a scanning device preferably electromagnetically
  • a movement signal is generated by the scanning device
  • the movement signal is processed, in particular amplified, by means of a control and / or regulating device, preferably electronically
  • the second pulsation conversion element is moved as a function of the movement signal by means of a drive device.
  • a particularly preferred embodiment of the method is characterized in that the movement signal is fed to at least one active element and / or at least one additional signal is superimposed on the movement signal at least temporarily for driving the second pulsation conversion element.
  • the invention is therefore based on the surprising finding that a transducer head can be filled in such a way that, on the one hand, pulsations, in particular exhaust gas pulsations from an internal combustion engine of a motor vehicle, can be converted into vibrations in a substantially enclosed space, such as the engine compartment of the motor vehicle, and on the other hand, it can also function properly at, for example, static pressures of 0.5 up to 1 bar is ensured in that a first pulsation conversion element can be coupled, so to speak, as an excitation element with a second pulsation conversion element either in the form of a sound radiation membrane or a structure-borne noise exciter with pressure equalization.
  • the sound transducer head according to the invention enables the desired sound radiation to be achieved for all frequency ranges, essentially independently of the amplitude of the pulsations supplied to the sound transducer head.
  • a rigid connection between the excitation element on the one hand and the sound radiation membrane of a sound radiation disc or a structure-borne sound exciter on the other hand can be brought about or at high excitation frequencies at which the pulsations occur have a lower amplitude, this connection can be released.
  • a movement of the excitation element can be detected via a scanning device and the sound radiation membrane or the structure-borne noise exciter, which can move independently of the excitation element, can be moved as a function of the detected movement of the excitation element and / or further signals via a drive device to generate a specific sound radiation.
  • FIG. 1 shows a sectional view of a first embodiment of the invention
  • Figure 2 is a sectional view of a second embodiment of the invention
  • Figure 3 is a sectional view of a third embodiment of the invention.
  • Figure 4 is a sectional view of a fourth embodiment of the invention.
  • Transducer head Figure 5 is a sectional view of a fifth embodiment of the invention.
  • FIG. 6 shows a perspective sectional view of a sixth embodiment of the transducer head according to the invention.
  • first transducer head 1 shows a first transducer head 1 according to the invention with a housing 3 which has an inlet opening 5 which is connected to a supply line (not shown) for supplying pulsations, in particular intake and / or exhaust gas pulsations to an internal combustion engine of a motor vehicle.
  • a partition 7 is arranged within the housing 3, which divides the interior of the sound transducer head 1 into a first section facing the inlet opening 5 and a second section facing a sound radiation area 9.
  • the housing 3 in the sound radiation area 9 is designed in the form of a horn 11.
  • an excitation membrane 13 is arranged, which in turn divides the first section into first and second chambers 15 and 17, separated from each other in an airtight manner.
  • the transducer head 1 has a connecting tube 19 which connects these chambers 15 and 17 to one another in such a way that there is always a static pressure equalization between them.
  • the connecting pipe 19 also includes a damping element 21, for example in the form of an adjustable cross-sectional constriction of the connecting pipe 19, by which it is ensured that high-frequency pressure fluctuations due to pulsations supplied to the transducer head 1 via the inlet opening 5 are not transmitted via the connecting pipe 19 ,
  • the excitation membrane 13 is operatively connected to a rigid coupling rod 25 via a connecting link, namely in the form of a center plate 23.
  • This coupling rod 25 is guided without friction via a sealing device in the form of a simer ring 27 through the partition 7 in order to ensure an airtight separation of the first section from the second section.
  • the second section is also divided by a sound radiation membrane 31 into a third and fourth chamber 29 and 33.
  • the sound radiation membrane 31 like the excitation membrane 13, has a center plate 35 which is connected to the coupling rod 25.
  • the two membranes 13 and 31 are held in a predetermined zero position by means of positioning devices in the form of spring elements 37 and 39.
  • 5 pulsations are first introduced into the first chamber 15 via the inlet opening.
  • the pulsations introduced into the first chamber 15 force a deflection of the excitation membrane 13 from its zero position and an oscillation thereof.
  • Low-frequency pressure fluctuations superimposed on the pulsations, in particular static pressure differences, are compensated for via the connecting pipe 19 between the first and second chambers 15 and 17. This prevents tensioning of the excitation membrane 13.
  • the damping element 21 also ensures that high-frequency pressure changes are not passed on directly from the first chamber 15 to the second chamber 17.
  • the vibrations of the excitation membrane 13 are transmitted to the coupling rod 25 via the center plate 23, whereby the sound radiation membrane 31 is set in vibration and thus the desired sound radiation takes place.
  • the transducer head 1 it is thus achieved by the transducer head 1 according to the invention that unimpeded sound radiation takes place independently of low-frequency pressure fluctuations. Furthermore, a connection of the inlet opening 5 with the surrounding atmosphere, as is undesirable for the emission of exhaust gas pulsations, can be avoided.
  • the sound emission characteristics of the transducer head 1 can be adapted to the pulsations supplied to the transducer head 1 in various ways.
  • the shape of the sound radiation area 9 can be used to vary the desired radiation characteristic.
  • the vibration of the diaphragms 13 and 31 can be varied in particular by adjusting the damping element 21, the spring elements 37 and / or 39 and the pretensioning of the diaphragms 13 and / or 31. Adjustment of the volume, in particular in the first chamber 15 and the supply line, not shown, can take place with the formation of a Helmholtz resonator.
  • FIG. 2 shows a second embodiment of the transducer head 1 'according to the invention.
  • Identical elements of the transducer head 1 'of Figure 2 in comparison to the transducer head 1 of Figure 1 have the same reference numerals.
  • the transducer head 1 'of FIG. 2 comprises an excitation membrane 13' and a sound radiation membrane 31 'which have areas of different flexibility.
  • the excitation membrane 13 ' namely has an edge region 13'a, which has a greater flexibility compared to the central region 13'b.
  • the sound radiation membrane 31 ' has an edge region 31'a which has greater flexibility than its central region 31'b.
  • This embodiment of the diaphragms 13 'and 31' makes it possible to adjust the sound absorption characteristics of the transducer head 1 ', in addition to changing the preload of the diaphragms 13' and 31 ', by changing the size of the areas of different flexibility and / or the difference in flexibility.
  • a sound transducer head according to the invention does not have to comprise a double membrane system, but instead can have a structure-borne sound exciter instead of an acoustically active sound radiation membrane.
  • FIG. 3 Such an embodiment of the transducer head 1 "according to the invention is shown in FIG. 3.
  • the same elements of the transducer head 1" of FIG. 3 in comparison to the transducer heads 1 and 1 'of FIGS. 1 and 2 have the same reference numerals.
  • the coupling rod 25 ' is connected on the one hand to the center plate 23 of the excitation membrane 13', on the other hand there is a plunger 41 at the upper end of the coupling rod 25 '.
  • the transducer head 1" is also connected to a body 45 via connecting elements 43 , so that pulsations supplied via the inlet opening 5 lead to vibrations of the excitation membrane 13 'and finally to impacts of the tappet 41 on the body 45, whereby the body 45 is excited to emit sound waves.
  • an additional chamber 47 between the body 45 and the partition 7 serves as a resonance body, so that the dimensions of this chamber 47 can be used to change the characteristics of the sound generated by the body 45.
  • FIG. 4 shows a fourth embodiment of a transducer head 1 "'according to the invention, reference being made again to the already known reference numerals.
  • the vibrations of the excitation membrane 13" are transmitted. performed on the sound radiation membrane 31 electromechanically.
  • the center plate 23 of the excitation membrane 13 ′′ is connected via a rod 49 to an electromagnetic-mechanical scanning device 51, which comprises, for example, a piezo-electric element.
  • the signals picked up by the scanning device 51 are passed on to a control device 55 via a line 53.
  • This control device 55 is connected to a drive device 59 via a line 57.
  • the drive device 59 is connected via a rod 61 to the center plate 35 of the sound radiation membrane 31.
  • the pressure equalization between the chambers 15 and 17 "separated from one another by the excitation membrane 13", that is to say between the first and second chambers, in the transducer head 1 "" of FIG. 4 is achieved through openings 63 in the excitation membrane 13 "
  • the openings 63 are filled with a damping element (not shown) in the form of foam, which means that only low-frequency pressure fluctuations are transmitted through the openings 63, but not high-frequency fluctuations.
  • a vibration of the excitation membrane 13 "of the transducer head 1 '" of FIG. 4 leads to the fact that vibration signals are passed on to the control device 55 via the scanning device 51.
  • the oscillation signals are processed in the control device 55 in such a way that a desired oscillation of the sound radiation membrane 31 is achieved by signals output to the drive device 59.
  • These signals cause various environmental parameters, e.g. when using the transducer head 1 '"in a motor vehicle, the speed of the internal combustion engine, the accelerator pedal position or the type of gear engaged influence the signals which are sent to the drive device 59.
  • FIG. 5 shows a fifth embodiment of a transducer head 1 "" according to the invention with the already known reference symbols for elements already mentioned.
  • the sound transducer head 1 "" comprises a housing 3 ', which is divided by a partition 7' into a first section facing an inlet opening 5 'and a second section facing a sound radiation area 9'.
  • the sound radiation area 9 ' has the shape of a horn 11'.
  • an excitation membrane 13 '" is arranged, which has at least one opening 63' for pressure equalization between the first and second chambers 15 'and 17'.
  • the excitation membrane 13 '" is in the second chamber 17' via a first spring element 67 connected to a pulsation body 69. Furthermore, between the pulsation body 69 and the Partition 7 'arranged a second spring element 71 in the first section.
  • the two spring elements 67 and 71 serve in particular to hold the pulsation body 69 arranged therebetween in a previously defined zero position when the excitation membrane 13 '"is at rest.
  • the pulsation body 69 is firmly connected to a coupling rod 73 which is guided through the partition 7'
  • a sealing ring 27 'arranged in the partition 7' serves as a seal.
  • the end of the coupling rod 73 opposite the pulsation body 69 is mounted in a drive body 75 arranged in a third chamber 29 'in the second section.
  • the drive body 75 is in turn rigid with a sound radiation membrane 31 ", which is arranged in a fourth chamber 33 'in the second section.
  • the transducer head 1 "" allows particularly flexible sound radiation, in particular also as a function of the frequency of a pulsation supplied to the transducer head 1 "" via the inlet opening 5 '.
  • the transducer head 1 "" for converting intake or exhaust pulsations of an internal combustion engine, there is the problem that at high pulsation frequencies, such as occur at high engine revolutions per minute, in particular from 4,000 revolutions per minute, the pulsation amplitudes are not sufficiently large to be one to achieve sufficient sound radiation by means of the sound radiation membrane 31 "when rigidly connected to the excitation membrane 13 '".
  • a distinction must therefore be made in particular between different excitation frequencies.
  • a connecting device 77 is provided in the drive body 75 for connecting the coupling rod 73 to the drive body 75.
  • This connecting device 77 comprises a coil 79 in the drive body 75, and in the area of the drive body 75 the coupling rod 73 has a permanent magnetization.
  • the coil 79 is connected to a control device 83 via a line 81.
  • the coil 79 is supplied with current by means of the control device 83, so that a connection between the coupling rod 73 and the drive body 75 is established due to the magnetic force between the permanent magnetic region of the coupling rod 73 and the coil 79.
  • essentially in the low frequency band in the transducer head 1 "" achieved a sound conversion in an analog form as in the previously described transducer heads 1, 1 'and 1 ".
  • a sound conversion in the transducer head 1 "" only takes place after the connection between the coupling rod 73 and the drive body 75 has been released by means of the connecting device 77 in that the power supply to the coil 79 has been switched off via the control device 83. Since the pulsation body 69 is thus essentially mechanically separated from the drive body 75, movement of the excitation membrane 13 ′ ′′ leads to a movement of the pulsation body 69, but the drive body 75 and thus the sound radiation membrane 31 ′′ generally remain at rest. However, the pulsation body 69 also comprises a coil 85, and the housing 3 'has permanent magnetization in the region of the second chamber 17'.
  • Movement of the pulsation body 69 therefore leads to the induction of a current into the coil 85, which is fed to the control device 83 by means of a line 87.
  • This induction current represents a movement signal of the excitation membrane 13 '", which is evaluated or processed in the control device 83.
  • the excitation frequency of the excitation membrane 13'" is determined in the control device 83.
  • the evaluated or processed movement signal can be transmitted by the control device 83 via a line 89, in particular for controlling a further active element, not shown, such as in a radio, engine mount, damper or shaker on a bulkhead inside the motor vehicle.
  • the movement signal can be amplified in the control device 83 and fed via a line 91 to a further coil 93, which is arranged in the drive body 75.
  • the housing 3 ' also has permanent magnetization in the region of the third chamber 29', so that the arrangement comprising the drive body 75, the radiation membrane 31 "and the housing 3 'represents a loudspeaker arrangement.
  • the drive body 75 can be set in motion and thus the sound radiation membrane 31 ′′ have been excited, as a result of which a desired sound radiation can be generated.
  • an additional signal can be superimposed on the movement signal of the excitation membrane 13 '"or this can be changed or damped as desired.
  • the transducer head 1 '"" comprises a housing 3 ", which consists essentially of three housing parts 3" a, 3 "b and 3" c.
  • the first and second housing parts 3 "a and 3" b are connected to one another via first connecting devices 4b and the first and third housing parts 3 "a and 3" c via second connecting devices 4a, each in the form of screw connections.
  • an inlet opening 5" is formed, through which pulsations, in particular intake and / or exhaust gas pulsations of an internal combustion engine of a motor vehicle, can be fed to the transducer head 1 '"" by means of a feed line, not shown.
  • the first housing part 3 "a is shaped in such a way that a partition 7" is provided which divides the housing 3 "into a first section facing the inlet opening 5" and a second section facing a sound radiation area 9 ". In that facing the inlet opening 5" A first pulsation conversion element is arranged in the first section of the housing 3 ".
  • the first pulsation conversion element of the sound transducer head 1""does not comprise an excitation membrane, but a disk 100.
  • the disk 100 has and is a center plate 102 connected in the area of the center plate 102 to a coupling rod 104.
  • the second housing part 3 "b has a cross-sectional shape complementary to the disk 100 in the area of the disk 100, so that the disk 100 is essentially freely movable within the second housing part 3" b along the longitudinal axis the coupling rod 104 is movable.
  • the disk 100 divides that of the laßöffiiung 5 "facing first section of the housing 3" in two chambers 15 ", 17", a first chamber 15 "and a second chamber 17".
  • the gap causes high-frequency pressure fluctuations to cause the disc 100 to move while being superimposed , low-frequency pressure fluctuations, in particular static pressure differences, are compensated for via the gap between the chambers 15 ", 17".
  • the movements of the disc 100 are transmitted via the coupling rod 104 to a rigid sound radiation disc 106.
  • the coupling rod 104 is via a Sealing device in the form of a Simmerring 27 "through the partition 7" guided without friction, so that an airtight separation of the first section from the second section of the housing 3 "is ensured.
  • a flexible, membrane-shaped separating disk 107 is arranged between the sound radiation disk 106 and the housing 3 ".
  • the separating disk 107 has a funnel-shaped central region 107b which is connected to the sound dissipation disk 106 or is formed in one piece therewith.
  • the separating disk 107 a curved edge region 107a, in the edge region 107a, the cutting disc 107 is fastened via the first connecting devices 4a 3 "a is enclosed, and a fourth chamber 33", which is essentially enclosed by the third housing part 3 "c, divided.
  • This construction of the second pulsation conversion element on the radiation side leads to the advantage that it takes up only a small installation space and thus the transducer head 1 '"" can be made more compact.
  • the sound radiation takes place essentially by the movement of the sound radiation disk 106, this being reinforced by the funnel-shaped or horn-shaped configuration of the cutting disk 107.
  • the cutting disc 107 also fulfills the function of a tight seal between the third and fourth chambers 29 ", 33", which prevents an acoustic short circuit between these chambers 29 ", 33". Furthermore, because of its flexibility and the shape of the edge region 107a, the cutting disc 107 enables the sound radiation disc 106 to move freely without any stresses forming within the cutting disc 107. Thus, when the sound radiation disk 106 moves, there is sound radiation from the sound transducer head 1 '"" in the sound radiation area 9 ". In contrast to the sound transducer heads 1, 1 'shown in FIGS. 1 and 2', no spring element is arranged in the third chamber 29 "in order to keep the sound radiation disk 106 in a predetermined zero position.
  • the transducer head 1 '"" shown in FIG. 6 also has further advantages. Due to the subdivision of the housing 3 "into the three housing parts 3" a, 3 "b, 3” c, it is modular. Different versions of the housing parts 3 "a, 3" b, 3 “c can be provided, which can be selectively combined with one another when the sound transducer head 1 '""is being assembled. Various third housing parts 3" c can thus be provided in order to determine certain sound radiation characteristics adjust their shape. Different sound radiation disks 106 and separating disks 107 can also be provided without the geometry of the first and third housing parts 3 "a and 3" c having to be adapted.
  • the sound radiation characteristic can be changed in that the dimensions of the second housing part 3 "b can be adapted to one another as a function of the dimensions of the disk 100 and / or from the coupling rod 104.
  • the transducer head 1""" can be adapted to different internal combustion engines adjust that by extending the second housing part 3 "b a longer stroke of the disc 100 is made possible or by increasing the cross section of the second housing part 3" b a larger volume of the first chamber 15 "is provided, so that with constant pulsations a smaller movement of the Disk 100 and thus the sound radiation disk 106 takes place, which is particularly desirable for high-frequency pulsations.
  • the shape of the disk 100 can also be adapted to the conditions.
  • a cup-shaped element can be used instead of the disk 100, or the gap size between the disk 100 and the second housing 3 "b can be changed in order to adapt the sound radiation characteristic.
  • the spring element 108 especially for adaptation purposes, can be exchanged by opening the second connecting devices 4b and then releasing the connection between the disk 100 and the coupling rod 104, so that the spring element 108 can be replaced.
  • a sound transducer head is thus provided for the first time, which enables unhindered sound radiation at different static pressures and can be matched in many ways to a desired radiation characteristic.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne une tête (4) de transducteur acoustique comprenant au moins un orifice d'entrée (5) pour une conduite d'admission, au moins un premier élément de conversion de pulsation (13) et au moins une zone de rayonnement acoustique (9) dans un boîtier (3). Selon cette invention, une cloison (7), sensiblement étanche à l'air, divise ce boîtier (3) en au moins deux sections, une première section étant en liaison active avec l'orifice d'entrée (5) et la deuxième section avec la zone de rayonnement acoustique. Le premier élément de conversion de pulsation (13) est installé dans ladite première section, elle-même divisée en une première chambre (15) et une deuxième chambre (17). Un dispositif compensateur de pression (19) est placé entre la première chambre (15) et la deuxième chambre (17). Un deuxième élément de conversion de pulsation est installé au moins partiellement dans la deuxième section de façon mobile au moins par endroits et un dispositif de transmission (25), placé entre la première et la deuxième section, sert à transmettre des oscillations du premier élément de conversion de pulsation (13) au deuxième élément de conversion de pulsation (31). La présente invention concerne également un transducteur acoustique, pourvu de ladite tête, ainsi qu'un procédé de transduction acoustique.
EP02777258A 2001-10-04 2002-09-30 Tete de transducteur acoustique, transducteur acoustique pourvu de cette tete et procede de transduction acoustique, en particulier pour un vehicule automobile Expired - Lifetime EP1432595B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10149169A DE10149169C1 (de) 2001-10-04 2001-10-04 Schallwandlerkopf und diesen umfassenden Schallwandler, insbesondere für ein Kraftfahrzeug
DE10149169 2001-10-04
PCT/EP2002/010925 WO2003031227A1 (fr) 2001-10-04 2002-09-30 Tete de transducteur acoustique, transducteur acoustique pourvu de cette tete et procede de transduction acoustique, en particulier pour un vehicule automobile

Publications (2)

Publication Number Publication Date
EP1432595A1 true EP1432595A1 (fr) 2004-06-30
EP1432595B1 EP1432595B1 (fr) 2005-02-23

Family

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Family Applications (1)

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EP02777258A Expired - Lifetime EP1432595B1 (fr) 2001-10-04 2002-09-30 Tete de transducteur acoustique, transducteur acoustique pourvu de cette tete et procede de transduction acoustique, en particulier pour un vehicule automobile

Country Status (3)

Country Link
EP (1) EP1432595B1 (fr)
DE (2) DE10149169C1 (fr)
WO (1) WO2003031227A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3325180B1 (fr) * 2015-07-24 2021-02-17 Robert Bosch GmbH Dispositif d'émission et/ou de réception de signaux acoustiques
CN113160785A (zh) * 2020-01-07 2021-07-23 尤姆弗泰克有限公司 用于降低空气传声和固体传声的设备

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DE10352704A1 (de) * 2003-11-12 2005-06-16 Mann + Hummel Gmbh Vorrichtung zur Geräuschübertragung in einem Kraftfahrzeug mit Brennkraftmaschine
DE102004041698B4 (de) * 2004-08-28 2014-02-13 Mann + Hummel Gmbh Vorrichtung zur Geräuschübertragung in einem Kraftfahrzeug
DE102005006914B4 (de) 2005-02-16 2008-05-29 Woco Industrietechnik Gmbh Vorrichtung zur Schallkopplung zwischen einem Ansaugtrakt und/oder Motorraum und einem Fahrzeuginnenraum eines Kraftfahrzeuges
RU2488176C2 (ru) * 2011-09-02 2013-07-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тольяттинский государственный университет" Акустомеханический преобразователь
DE102015106000A1 (de) 2015-04-20 2016-10-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Schallgenerator für ein Kraftfahrzeug
GB202111213D0 (en) * 2021-08-03 2021-09-15 Mclaren Automotive Ltd Improved sound bypass

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DE19715365C2 (de) * 1997-04-11 1999-03-25 Sennheiser Electronic Kondensatormikrofon
DE19922216A1 (de) * 1999-05-14 2000-11-30 Mahle Filtersysteme Gmbh Schallübertragungsvorrichtung für ein Kraftfahrzeug
DE10042012B4 (de) * 1999-11-22 2004-08-19 Daimlerchrysler Ag Vorrichtung zur Geräuschgestaltung bei einem Kraftfahrzeug

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3325180B1 (fr) * 2015-07-24 2021-02-17 Robert Bosch GmbH Dispositif d'émission et/ou de réception de signaux acoustiques
CN113160785A (zh) * 2020-01-07 2021-07-23 尤姆弗泰克有限公司 用于降低空气传声和固体传声的设备
CN113160785B (zh) * 2020-01-07 2024-02-23 尤姆弗泰克有限公司 用于降低空气传声和固体传声的设备

Also Published As

Publication number Publication date
DE10149169C1 (de) 2002-12-12
WO2003031227A1 (fr) 2003-04-17
EP1432595B1 (fr) 2005-02-23
DE50202339D1 (de) 2005-03-31

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