WO1998055060A1 - Suppression of fluid-borne noise - Google Patents
Suppression of fluid-borne noise Download PDFInfo
- Publication number
- WO1998055060A1 WO1998055060A1 PCT/US1998/011738 US9811738W WO9855060A1 WO 1998055060 A1 WO1998055060 A1 WO 1998055060A1 US 9811738 W US9811738 W US 9811738W WO 9855060 A1 WO9855060 A1 WO 9855060A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conduit
- fluid
- actuator
- sensor
- set forth
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0333—Noise absorbers by means of an active system
Definitions
- the present invention is directed to suppression of fluid-borne noise in fluid handling systems, such as in automotive power steering, power brake, fuel and air conditioning systems.
- Fluid-borne noise can also be a problem in industrial hydraulic applications in terms of both generation of audible noise, and wear and fatigue of system components.
- Kumar "Smart Materials For Acoustic or Vibration Control.” Pennsylvania State University (1991) teaches that fluid-borne noise within a metal tube can be suppressed by positioning a piezoelectric actuator at one end of the fluid tube.
- the piezoelectric actuator is disposed between an aluminum block that is affixed to the tube and an aluminum block that is coupled to a rubber membrane in contact with the fluid.
- a sensor is disposed between the actuator and the membrane block, and is coupled through a frequency selective preamplifier, a phase shifter and an amplifier for energizing the piezoelectric actuator 180° out of phase with the predominant frequency of vibration within the fluid.
- One object of the present invention is to provide a system and method that satisfy these objectives.
- Another object of the present invention is to provide a system and method of fluid-borne noise suppression in which a single unit configuration can be employed in a variety of applications.
- it is an objective of the invention to provide a system and method for suppression of fluid-borne noise in automotive power steering systems in which a single unit design can be employed in conjunction with a wide variety of power steering systems.
- Another object of the present invention is to provide a system and method that are characterized by low power consumption. Summary of the Invention
- Apparatus for suppressing fluid-borne noise in a fluid conduit in accordance with the various preferred embodiments of the invention includes a vibration sensor for operative coupling to the conduit for providing an electrical sensor signal as a function of fluid pressure fluctuations in the conduit.
- a piezoelectric actuator is adapted to be mounted on the conduit for imparting pressure fluctuations to fluid in the conduit.
- An electronic controller is responsive to the sensor signal for energizing the actuator 180° out of phase with fluid pressure fluctuations sensed by the sensor.
- the sensor may be either closely coupled to the actuator, or separate from the actuator and disposed upstream of the actuator with respect to the direction of fluid flow through the conduit.
- the sensor in the preferred embodiments of the invention comprises a piezoelectric sensor, and the actuator comprises a stack of piezoelectric elements.
- the electronic control unit is responsive to frequency components of pressure fluctuations of fluid in the conduit for energizing the actuator as a function of the amplitude of the frequency component of greatest amplitude.
- the sensor is responsive to fluid pressure fluctuations in the conduit over a broad frequency range, much lower than the resonant frequencies of the sensor and actuator.
- the frequency range in the preferred embodiments of the invention preferably is from zero to at least 1000 hertz.
- a fluid handling system in accordance with another aspect of the present invention includes a conduit for conducting fluid under pressure and an apparatus of the character described above for suppressing fluid-borne noise caused by fluid pressure fluctuations in the conduit.
- the conduit includes a volumetric enlargement to which the sensor and actuator are coupled, or a right-angled turn at which the sensor and actuator are disposed in opposition to fluid flowing through the conduit.
- the actuator comprises a plurality of annular discs disposed within the conduit in such a way that fluid flows through the discs.
- the sensor is either closely coupled to the actuator, or is separate from the actuator and disposed upstream of the actuator with respect to the direction of fluid flow through the conduit.
- the conduit includes an opening, and the noise suppression apparatus of the invention is disposed in a unitary assembly removably received in the opening.
- a method of suppressing fluid-borne noise caused by pressure fluctuations in fluid flowing through a conduit includes sensing the amplitude and frequency components of pressure fluctuations in the conduit, and energizing a piezoelectric actuator as a function of the amplitude and frequency components so as to impart pressure fluctuations to fluid in the conduit.
- the actuator preferably is energized as a function of the frequency component of greatest amplitude, 180° out of phase with such frequency component.
- FIG. 1 is a schematic diagram of a fluid handling system equipped with a fluid- borne noise suppression apparatus in accordance with the present invention
- FIG. 2 is a schematic diagram of the noise suppression apparatus of FIG. 1 ;
- FIGS. 3, 4, 5 and 6 are schematic diagrams of respective modified embodiments of the invention.
- FIG. 1 illustrates a fluid handling system 10 in accordance with one implementation of the present invention as comprising a tubular section of conduit 12 that receives fluid at one end from a pump 14 and a sump 16, and delivers fluid from the opposing end through a load 18 to sump 16.
- Conduit 12 may be of any suitable composition.
- a collar 20 of low carbon steel or other suitable composition is affixed to conduit 12 between its opposed ends. As best seen in FIG. 2, collar 20 cooperates with conduit 12 to form a fluid volume 22 of enlarged diameter as compared with the diameter of conduit 12.
- An electronic assembly 24 has a case 26 with a plug 28 at one end adapted to be removably received within an opening 30 on collar 20.
- plug 28 may contain external threads for removable receipt within internally threaded opening 30.
- plug 20 and opening 30 may contain suitable fittings for quarter-turn mounting within the collar opening.
- Electronic assembly 24 is coupled to a source 32 of electrical power, preferably through a switch 34 for selectively applying power to assembly 24 during periods of use.
- switch 34 may be associated with an automobile power system for applying electrical power to assembly 24
- electronic assembly 24 in this embodiment of the invention includes a vibration sensor 36 that provides an input signal to a broad-band amplifier 38 as a function of fluid-borne vibration within area 22 of fluid conduit 12.
- a piezoelectric actuator 40 which may comprise a stack of individual piezoelectric disks 42 as shown.
- Sensor 36 provides to amplifier 38 a signal having one or
- actuator 40 is energized in direct proportion to the noise signal component of highest amplitude. Furthermore, amplifier 38 shifts such frequency component 180°, so that actuator 40 is energized 180° out of phase with the selected noise component.
- actuator 40 imparts vibrations to the fluid within collar volume 20 at a frequency and magnitude to cancel or suppress the fluid- borne vibration wavelength of highest magnitude.
- Enlarged volume 22 enlarges the fluid surface area available for actuator 40.
- Sensor 36 and actuator disks 42 may be of any suitable composition, such as lead-zinc-titanate or modified lead-titanate.
- Piezoelectric actuators have several advantages including precision displacement, generation of large forces, extremely fast response, and high input impedance requiring low drive power.
- Amplifier 38 illustrated functionally in the drawings, may comprise simple analog circuitry, or digital circuitry based upon individual component or microprocessor control. Microprocessor-based control can employ fuzzy logic or neural network technology, if desired. It will be appreciated, of course, that actuator 40 need not be disposed at a position directly opposite to the direction of fluid flow. The noise vibrations within the fluid create hydrostatic pressure pulses in all directions.
- a single sensor 36, broadband amplifier 38 and actuator 40 may be employed in a variety of applications in which fluid-borne noise is generally within the same frequency range.
- fluid-borne noise in automotive power steering applications can be expected to be within the range of about 0 to 1000 Hz regardless of manufactures or model. This is well below the resonant frequency of typical sensors 36 and actuators 40.
- a single broadband system or unit, designed to operate at pressures up to 1500 psi at 200° F may thus be employed for all models. The same is true for various manufacturers and models of automotive air conditioning systems, automotive power brake systems, and automotive fuel delivery systems.
- FIGS. 3-6 illustrate various modified embodiments of the invention, in which like reference numerals indicate like components, and like reference numerals with a letter suffix indicate related components.
- sensor 36a is formed as part of piezoelectric actuator 40a, and thus is closely coupled to the actuator during operation. To reduce coupling between actuator 40a and sensor 36a, the sensor material should have a low
- planar coupling coefficient such as modified lead titanate
- sensor thickness should be such that its resonant frequency is in the megahertz range.
- the noise vibration electronics is disposed at a right-angle bend in fluid conduit 12a, so that the actuator is approximately axially opposed to the direction of fluid flow.
- Sensor 36 in FIG. 4 is separate from actuator 40, while sensor 36a in system 48 of FIG. 5 is again closely coupled
- piezoelectric actuator 40b is disposed within conduit 12, and is composed of a plurality of annular disks 42b stacked with respect to each other so that the direction of flexure is parallel to the direction of fluid flow through conduit 12.
- Vibration sensor 36 is coupled to conduit 12 upstream of actuator 40b, and operates through
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/445,373 US6658118B1 (en) | 1998-06-05 | 1998-06-05 | Suppression of fluid-borne noise |
AU80604/98A AU8060498A (en) | 1997-06-06 | 1998-06-05 | Suppression of fluid-borne noise |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4884997P | 1997-06-06 | 1997-06-06 | |
US60/048,849 | 1997-06-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998055060A1 true WO1998055060A1 (en) | 1998-12-10 |
Family
ID=21956777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/011738 WO1998055060A1 (en) | 1997-06-06 | 1998-06-05 | Suppression of fluid-borne noise |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU8060498A (en) |
WO (1) | WO1998055060A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1041588A1 (en) * | 1999-03-29 | 2000-10-04 | ABB T&D Technologies Ltd. | Low noise transformer |
WO2004090345A1 (en) * | 2003-04-12 | 2004-10-21 | Daimlerchrysler Ag | Device and method for attenuating pressure fluctuations in hydraulic lines |
WO2007065640A1 (en) * | 2005-12-08 | 2007-06-14 | Airbus Deutschland Gmbh | Device for reducing hydraulic-fluid oscillation in a hydraulic system |
DE102008019488A1 (en) * | 2008-04-17 | 2009-10-22 | Behr Gmbh & Co. Kg | Fluiddruckpulsationsdämpfungsvorrichtung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5493615A (en) * | 1993-05-26 | 1996-02-20 | Noise Cancellation Technologies | Piezoelectric driven flow modulator |
-
1998
- 1998-06-05 WO PCT/US1998/011738 patent/WO1998055060A1/en active Application Filing
- 1998-06-05 AU AU80604/98A patent/AU8060498A/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5493615A (en) * | 1993-05-26 | 1996-02-20 | Noise Cancellation Technologies | Piezoelectric driven flow modulator |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1041588A1 (en) * | 1999-03-29 | 2000-10-04 | ABB T&D Technologies Ltd. | Low noise transformer |
WO2000058978A1 (en) * | 1999-03-29 | 2000-10-05 | Abb T & D Technologies Ltd. | Low noise transformer |
US6633107B1 (en) | 1999-03-29 | 2003-10-14 | Abb T & D Technology Ltd. | Low noise transformer |
WO2004090345A1 (en) * | 2003-04-12 | 2004-10-21 | Daimlerchrysler Ag | Device and method for attenuating pressure fluctuations in hydraulic lines |
WO2007065640A1 (en) * | 2005-12-08 | 2007-06-14 | Airbus Deutschland Gmbh | Device for reducing hydraulic-fluid oscillation in a hydraulic system |
JP2009518594A (en) * | 2005-12-08 | 2009-05-07 | エアバス・ドイチュラント・ゲーエムベーハー | Device for reducing hydraulic fluid vibrations in hydraulic systems |
US8337179B2 (en) | 2005-12-08 | 2012-12-25 | Airbus Operations Gmbh | Device for reducing hydraulic-fluid oscillation in a hydraulic system |
DE102008019488A1 (en) * | 2008-04-17 | 2009-10-22 | Behr Gmbh & Co. Kg | Fluiddruckpulsationsdämpfungsvorrichtung |
Also Published As
Publication number | Publication date |
---|---|
AU8060498A (en) | 1998-12-21 |
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