WO2001055633A1 - Electromagnetic support system - Google Patents
Electromagnetic support system Download PDFInfo
- Publication number
- WO2001055633A1 WO2001055633A1 PCT/US2001/001445 US0101445W WO0155633A1 WO 2001055633 A1 WO2001055633 A1 WO 2001055633A1 US 0101445 W US0101445 W US 0101445W WO 0155633 A1 WO0155633 A1 WO 0155633A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- die
- respect
- electromagnet
- electromagnets
- electromagnetic device
- 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
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/12—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
-
- 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
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/043—Allowing translations
-
- 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
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M2200/00—Details of stands or supports
- F16M2200/04—Balancing means
Definitions
- the present invention relates to electromagnetic support systems, including systems for magnetically levitating, suspending, constraining, and/or isolating vibrating objects.
- Electromagnetic support systems have a wide variety of uses. They may be employed, for example, to support vibrating mechanical equipment in marine vessels and other apparatuses.
- Electromagnetic support systems may also be used to constrain rotating shafts, to provide stable levitation for transportation systems, and to support precision measuring equipment, for example, and to attenuate acoustic vibrations that would otherwise be transmitted to connected structures.
- Other examples of electromagnetic support systems are provided in U.S. Patents Nos. 5,387,851 (Nuscheler et al.), 5,291,967 (Aoki), 5,126,641 (Putman et al.), and 5,011,108 (Chen et al.).
- the present invention relates to a support system that has at least one device for applying electromagnetic forces between first and second objects, and an elastomeric structure (such as a rubber pad) for supporting the electromagnetic device.
- the electromagnetic device is positively controlled as a function of (A) the position of the first object with respect to the second object and (B) die position of die electromagnetic device with respect to the second object.
- an elastomeric pad structure is provided for each electromagnet.
- sensors are used to provide data to the controller.
- the sensors provide information representative of the relative positions and/or movements of die electromagnets.
- the present invention also relates to the use of elastomeric connectors or otiier compliant devices (such as coil springs, pneumatic springs, or magnetic springs) to simplify the resonance patterns of vibrating objects. Simplifying the vibrational resonance patterns makes it easier to use signal processing to dynamically attenuate die remaining vibrations.
- the compliant devices may also be used to reduce the intensity of high frequency vibration transmission.
- the compliant connector devices are formed of hard rubber. Such devices are economical, effective, easy to install, and durable.
- each compliant device resembles a lightiy-damped but stiff spring.
- the impedance mismatch between a massive magnet and a lightiy-damped spring is greater than between a massive magnet and a heavily-damped spring. Consequentiy, high frequency vibration transmission is attenuated more effectively when the inherent damping associated with the compliant device is relatively low.
- d e compliant devices are configured to permit rocking and/or rotational motion of the magnet relative to die hull.
- die devices are constructed such that rocking and/or rotational motions are not transmitted into die hull.
- the present invention also relates to a method of supporting a vibrating object, such as a machinery raft, a rotating shaft, etc., with respect to a fixed object, such as a ship hull, an aircraft housing, or die floor of a factory.
- a vibrating object such as a machinery raft, a rotating shaft, etc.
- An object of die invention is to provide compliant mounts for an electromagnetic support system.
- the compliant mounts which may be formed of hard rubber, simplify the resonance pattern of the associated electromagnets, which makes it relatively easy to eliminate vibrations tiiat would otherwise be transmitted to a connected structure.
- the present invention also may be used to simplify the dominant coupling and vibration transmission mechanism between the electromagnets and the connected structure (such as a hull).
- Another object of die invention is to provide an electromagnetic support system that provides improved acoustic insulation.
- the invention may be used to reduce noise levels. It also may be used to prevent structural fatigue that might oti erwise be caused by vibrations in the mechanical components of the system.
- Anotiier object of the invention is to provide an acoustic attenuation system witii relatively uncomplicated signal processing requirements.
- FIG. 1 is a side view of an electromagnetic support system constructed in accordance with the present invention.
- FIGS. 2 and 3 are resonance diagrams, showing relationships between vibration amplitude and vibration frequency, for explaining some of the advantages of die present invention.
- FIG. 4 is a side view of another support system constructed in accordance with the present invention.
- FIG. 5 is a cross sectional view of an electromagnet/armature pair constructed in accordance with die present invention.
- FIG. 1 a system 10 for supporting a flexible machinery raft or other support structure 12 witii respect to a ship hull 14.
- the raft 12 may be used, for example, to support a motor 16 and a pump 18.
- the motor 16 may be connected to the pump 18 by a rotating drive shaft 20. In operation, vibrations generated by the machinery 16-20 are transmitted to the raft 12.
- the support system 10 may be used to damp or cancel out the vibrations in the raft 12.
- die support system 10 may be used to reduce die amplitude of acoustic vibrations tiiat would otherwise be transmitted to the ship hull 14.
- the support system 10 may also be used to reduce flexing of the raft 12, to thereby prevent misalignment of the machinery 16-20.
- the illustrated support system 10 includes a two-dimensional array of opposed electromagnets 30, 32, 34 and metal armatures 36, 38, 40.
- FIG. 1 For the sake of clarity of illustration, only three pairs of opposed electromagnets 30-34 and armatures 36-40 are shown in FIG. 1 — three electromagnets 30-34 located directly above d ree lower armatures 36-40.
- the other electromagnet/armature pairs forming the two- dimensional array are hidden from view in FIG. 1 behind the illustrated electromagnets 30-34 and armatures 36-40.
- a large number of electromagnet/armature pairs may be used to support the raft 12.
- the operation of the additional, unillustrated electromagnet/armature pairs may be the same as that of the illustrated electromagnets and armatures 30-40.
- the electromagnets 30-34 generate upwardly directed magnetic forces.
- the forces are applied to die armatures 36-40 to levitate the raft 12 (that is, to pull the raft 12 toward a support portion 42 of the ship hull 14).
- the illustrated support portion 42 may be an integral part of the hull 14, or the support portion 42 may be integrally connected to die hull 14.
- the armatures 36-40 are drawn toward the hull support portion 42 by the magnetic forces of the electromagnets 30-34.
- the magnetic forces are generated by electrical currents supplied through lines 50, 52, 54.
- a suitable controller 62 is provided for dynamically and individually controlling the currents supplied to the electromagnets 30-34. By contiolling the currents in the lines 50-54, the controller 62 is able to dynamically and individually control the magnitudes of the forces generated by the electromagnets 30-34.
- the controller 62 responds to data signals from lower transducers 64, 66, 68.
- the transducers 64-68 are fixed with respect to the armatures 36-40.
- the transducers 64-68 generate signals tiiat are representative of the distances 72, 74, 76 between the armatures 36-40 and the ship hull support portion 42.
- the transducers 64-68 may include optical distance sensors, for example.
- the transducers 64-68 may also include motion sensors to generate signals tiiat are representative of the accelerations of the armatures 36-40, if desired.
- the signals generated by the transducers 64-68 are transmitted to die controller 62 by suitable signal lines 80, 82, 84.
- the controller 62 In response to die signals from the transducers 64-68, the controller 62 individually controls die electromagnets 30-34 to (1) maintain the alignment of the equipment 16-20 on the raft 12 and/or (2) damp the vibrations of the raft 12 to reduce die amplitude of vibrations transmitted to die hull 14 through the support portion 42.
- the forces generated by the electromagnets 30-34 are linearly proportional to the respective outputs of the controller 62.
- the transducers 64-68, die controller 62 and the electromagnets 30-34 form a first multi- channel control loop.
- the first control loop may employ a modal matrix decomposition function to identify wave functions within die flexible, vibrating raft 12. Once the wave functions are identified, electrical currents corresponding to an inverse modal matrix configuration are supplied to die electromagnets 30-34 to substantially cancel out the raft vibrations.
- a suitable signal processing technique for the first control loop is described in U.S. Patent No. 5,022,628, die entire disclosure of which is incorporated herein by reference. Other signal processing techniques may also be used, if desired.
- the armatures 36-40 may be rigidly and integrally connected to the raft 12.
- the armatures 36-40 may be connected to die raft 12 by steel bolts (not illustrated).
- the armatures 30-34 may be welded to the raft 12.
- the electromagnets 30-34 are elastomerically connected to the support portion 42 by hard rubber pads 88, 90, 92.
- the rubber pads 88-92 are interposed between the electromagnets 30-34 and the ship hull 14. It is preferable, but not essential, to place the more massive components (i.e., the electromagnets 30-34) on the hull side (i.e., die same side as die compliant pads 88-92) to maximize the impedance mismatch and hence die effectiveness of the compliant elements 88-92 at higher frequencies.
- the pads 88-92 may be used to simplify the vibration resonance patterns of die electromagnets 30-34, and the pads 88-92 provide other advantages, as described in more detail below.
- die support system would be constructed and operated without the elastomeric pads 88-92. If die pads 88-92 were not used, and d e electromagnets 30-34 were instead rigidly attached to die support portion 42 by bolts or welds, there still would be some vibration of the electromagnets 30-34 with respect to die hull 14.
- the electromagnets 30-34 would tend to vibrate according to complex resonance patterns of the type represented by line 96 in FIG. 2. That is, the electromagnets 30-34 would tend to vibrate at high amplitudes at discrete frequencies f ⁇ f-,fz-
- Vibration problems associated witii the electromagnets 30-34 would be especially pronounced where there are restrictions on the weight and size of the rigid connections. Consequently, d e elastomeric connections 88-92 of the present invention are especially advantageous in situations where large, complicated rigid connections for the electromagnets 30-34 would be undesirable.
- an advantage of die elastomeric pads 88-92 is that they cause the electromagnets 30-34 to have smooth, simplified resonance patterns of the type shown by line 98 in FIG. 3.
- the pads 88-92 may be employed to cause the vibrational resonance patterns for the electromagnets 30-34 to be more smoothly defined, predictable and manageable.
- the pads 88-92 also cause the highest amplitude vibrations to be at lower frequencies. That is, the pads 88-92 shift die curves of FIGS. 2 and 3 to the left, so that the resonant vibrations occur generally at lower frequencies. Smoothing out the resonance patterns of the electromagnets 30-34 and shifting the patterns to lower frequencies make it easier to cancel out high amplitude vibrations by signal processing.
- a second multichannel control loop is provided to further attenuate the vibrations of the electromagnets 30-34.
- the electromagnets 30-34 are attached to the elastomeric pads 88-92. Since die pads 88-92 tend to provide simpler, broader resonance patterns at lower frequencies, die signal processing for the second control loop may be relatively uncomplicated.
- the second control loop operates to damp and suppress vibrations of the attached electromagnets 30-34.
- d e support system 10 includes upper transducers 102, 104, 106 that are fixed witii respect to die electromagnets 30-34.
- the upper transducers 102-106 generate data signals on lines 110, 112, 114.
- the upper transducers 102-106 may have optical sensors.
- die upper transducers 102-106 may include pressure sensors embedded in the rubber pads 88-92 for sensing the compression of the rubber pads 88-92.
- the signals generated by the upper transducers 102-106 may be representative of the respective distances 118, 120, 122 between the upper transducers 102-106 and die ship hull support portion 42.
- the signals may also be representative of the accelerations of the upper transducers 102-106, if desired.
- the signals are transmitted to the controller 62 via the lines 110-114.
- the controller 62 processes the signals from the lines 110-114 concurrentiy with the processing of the signals from the lines 80-84. As an output, die controller 62 applies time-varied currents to d e electromagnets 30-34 to reduce the amplitude of die vibrations of the electromagnets 30-34. In operation, the vibrations of the electromagnets 30-34 may be attenuated to die extent represented by line 126 in FIG. 3. In a preferred embodiment of die invention, the amplitudes of what would otiierwise be the most intense resonant vibrations (at frequencies f ⁇ , f 2 , f 3 ) may be reduced by twenty or more decibels.
- Anotiier advantage of die present invention is that the pads 88-92 reduce d e intensity of high frequency vibration transmission (for example, at frequencies greater than ⁇ ) without the use of additional signal processing at those high frequencies.
- the pads 88-92 provide an additional impedance discontinuity at high frequencies which tends to impede or attenuate the transmission of vibrations to the hull.
- die invention may be used with a wide variety of systems and apparatuses, including but not limited to ships of all kinds, fixed wing aircraft, helicopters, measuring instruments, and manufacturing equipment.
- the invention may also be used to isolate, acoustically insulate, and constrain a wide variety of objects, including but not limited to platforms, rotating shafts, mechanical and/or electronic devices, and vibrating pipes and otiier connections.
- FIG. 4 shows a system 130 for supporting a bearing 132 with respect to a housing 134.
- the housing 134 may be a ship hull, a helicopter housing, or a wide variety of otiier objects.
- the bearing 132 may be used to constrain a rotating shaft 136, for example.
- the support system 130 may be used to prevent high amplitude acoustic vibrations from being transmitted from the shaft 136 to the housing 134.
- the support system 130 includes a tiiree-dimensional array of opposed electromagnets 30, 32 and armatures 36, 38. For the sake of clarity of illustration, only two pairs of opposed electromagnets 30, 32 and armatures 36, 38 are shown in FIG.
- the magnitudes of die magnetic forces are individually controlled by varying die electrical currents supplied to die electromagnets 30, 32 by a common controller 62 (not shown in FIG. 4). By controlling the applied currents, the controller 62 is able to dynamically and individually control the magnitudes of the forces generated by d e electromagnets 30, 32.
- the controller 62 may be a programmed microprocessor, for example.
- the controller 62 responds to data signals from inner transducers 64, 66 that are fixed witii respect to die armatures 36, 38.
- the transducers 64, 66 generate signals that are representative of the radial distances 72 between the armatures 36, 38 and die housing 134.
- the controller 62 individually controls die electromagnets 30, 32 to (1) maintain die desired position of the shaft 136 and/or (2) buffer the vibrations that would otiierwise be transmitted to the housing 134.
- the electromagnets 30, 32 are elastomerically connected to the housing 134 by hard rubber pads 88, 90.
- the pads 88, 90 simplify die vibrational resonance patterns of the electromagnets 30, 32, and generally reduce die resonant frequencies of the amplitude peaks, so tiiat the vibrations of the electromagnets 30, 32 can be relatively easily canceled out by signal processing (by the controller 62).
- FIG. 5 provides a detailed view of an electromagnet/armature pair for the svstem 10 shown in FIG. 1.
- each electromagnet/armature pair in the two dimensional array of d e FIG. 1 system may be constructed as illustrated in FIG. 5.
- the electromagnet/armature pairs shown in FIG. 4 may be constructed as shown in FIG. 5.
- the present invention should not be limited, however, to the specific structures and instrumentalities shown and described in detail herein.
- the electromagnet 30 is electromagnetically coupled to die armature 36 such tiiat rocking and/or rotational motions of the armature 36 are transmitted into die electromagnet 30.
- High frequency rocking and/or rotational motions transmitted across die electromagnetic gap 202 are not readily controlled by applying respective signals to the electromagnetic coil 200 through the control line 50. This is because the electromagnetic forces produced by the coil 200 are active only in the linear direction (that is, the forces are active only in the direction of axis 204).
- Applicants have found tiiat by suitably designing the geometry of the compliant mounting structure 88, it is possible to ensure that the rocking and/or rotational motions induced in d e electromagnet 30 are not readily transmitted into the support component 42.
- the compliant structure 88 operates in tension. If the electromagnet 30 is suspended from points near its central axis 204 (as shown in solid lines in FIG. 5), then d e electromagnet 30 can be maintained in a stable manner but is largely free to rock and rotate (in the direction of arrow 206). The rocking and/or rotating motions are not transmitted upwards into the support component 42 through the suspension structure (i.e., the pad 88).
- die compliant element 88 is in the form of a hollow cylinder with a relatively small moment of inertia.
- the outer diameter 208 of the compliant cylinder 88 is substantially less than the width 210 of the electromagnet 30 such that tiie moment of inertia of die compliant element 88 is substantially less than tiiat of the comparative structure shown in dotted lines in FIG. 5.
- Otiier compliant structures with reduced tendency to transmit rocking and/or rotational vibrations into the support component 42 may also be used instead of die illustrated structure 88, if desired.
- the compliant mounting structure 88 can be used botii to simplify the vibration transmission mechanism of the system 10, as well as to reduce die absolute magnitude of such transmitted vibration.
- a suitable rotational constraint may be supplied. But the constraint can be designed to be much less stiff than the stiffness of the compliant structure 88 in tension. In other words, the compliant structure 88 may be stiffer in the axial direction 204 than it is in the rotational direction 206.
- An advantage of die present invention is that the compliant mounting structure 88 enables the resonance patterns of the electromagnet 30 to be simplified. In addition, the structure 88 simplifies the dominant coupling and transmission mechanisms.
- the compliant mounting structure 88 may be made of a comparatively hard material, such as hard rubber.
- static displacements of the electromagnets 30-34 witii respect to the support structure 42 would be almost undetectable, but die dynamic effects take a predictable and favorable form.
- die compliant structure 88 The purpose of die compliant structure 88 is to provide an impedance discontinuity which attenuates the transmission of vibration from the electromagnet 30 into the support component 42.
- the compliant structure 88 may operate most effectively when it resembles a Hghtiy-damped stiff spring, rather than a heavily- damped stiff spring.
- the impedance mismatch between a relatively massive magnet 30 and a lightiy-damped spring is much greater than between a massive magnet and a heavily-damped spring. Therefore, high frequency vibration transmission is attenuated more effectively when the inherent damping associated with the compliant structure 88 is low.
- control system 62 may be used to damp such potentially high amplitudes. Very high damping at resonant frequencies can be supplied entirely by the second control loop, without compromising the natural high frequency passive impedance mismatch which exists between die electromagnet 30 and the compliant structure 88.
- the present invention should not be limited to the preferred embodiments shown and described herein.
- the invention has been described in terms of electromagnets tiiat are individually associated with armatures, it may also be possible to use paired electromagnets tiiat attract or repel each other.
- permanent magnets may be used in die magnet pairs or as an alternative to the armatures.
- the compliant rubber pads 88-92 may be compressed between the associated electromagnets and die housing 14, 134, or the compliant connections alternatively may be installed in tension.
- the compliant connections may be used to suspend die electromagnets from a fixed object, for example.
- the tension members may be formed of elastomeric material, coiled springs, pneumatic springs, and the like.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001227922A AU2001227922A1 (en) | 2000-01-27 | 2001-01-17 | Electromagnetic support system |
EP01902082A EP1250549A4 (en) | 2000-01-27 | 2001-01-17 | Electromagnetic support system |
JP2001555734A JP2003521650A (en) | 2000-01-27 | 2001-01-17 | Electromagnetic support system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/492,827 | 2000-01-27 | ||
US09/492,827 US6487061B1 (en) | 2000-01-27 | 2000-01-27 | Electromagnet support system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001055633A1 true WO2001055633A1 (en) | 2001-08-02 |
Family
ID=23957797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/001445 WO2001055633A1 (en) | 2000-01-27 | 2001-01-17 | Electromagnetic support system |
Country Status (5)
Country | Link |
---|---|
US (2) | US6487061B1 (en) |
EP (1) | EP1250549A4 (en) |
JP (1) | JP2003521650A (en) |
AU (1) | AU2001227922A1 (en) |
WO (1) | WO2001055633A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012112296A1 (en) * | 2011-02-17 | 2012-08-23 | Johnson Controls Technology Company | Magnetic attenuator |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7113384B2 (en) * | 2000-01-27 | 2006-09-26 | Vssl Commercial, Inc. | Dynamic degaussing system |
GB2361757B (en) * | 2000-04-28 | 2003-12-03 | Bae Sys Electronics Ltd | Improvements in or relating to the damping of vibration |
DE102016100750A1 (en) * | 2016-01-18 | 2017-07-20 | Airbus Operations Gmbh | Vehicle body and method for mounting a vehicle body |
US9469395B1 (en) * | 2016-03-14 | 2016-10-18 | Arnav Simha | Multi-layer body with active mitigation for turbulence reduction |
Citations (2)
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US5011108A (en) * | 1989-08-10 | 1991-04-30 | Mechanical Technology Incorporated | Active mounts |
US5133527A (en) * | 1989-08-10 | 1992-07-28 | Mechanical Technology Incorporated | Active mounts |
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JPS51121356A (en) * | 1975-04-17 | 1976-10-23 | Akira Yamamura | Anti-vibration bench device |
US4083433A (en) | 1976-11-16 | 1978-04-11 | Westinghouse Electric Corporation | Active vibration damper with electrodynamic sensor and drive units |
JPS5650814A (en) * | 1979-10-03 | 1981-05-08 | Nissan Motor Co Ltd | Support for engine |
DE3314335A1 (en) * | 1983-04-20 | 1984-10-31 | Tillmann 6108 Weiterstadt Freudenberg | ENGINE MOUNT |
JPS63111339A (en) * | 1986-10-29 | 1988-05-16 | Hitachi Ltd | Vibration damping device |
JPS63306183A (en) * | 1987-06-03 | 1988-12-14 | 株式会社日立製作所 | Vibration control equipment |
GB8816188D0 (en) | 1988-07-07 | 1988-11-16 | Marconi Gec Ltd | Mounting for machinery |
JPH04231750A (en) | 1990-12-28 | 1992-08-20 | Nissan Motor Co Ltd | Vibration-proof supporting device |
US5126641A (en) | 1991-03-08 | 1992-06-30 | Westinghouse Electric Corp. | Bidirectional variable reluctance actuator and system for active attenuation of vibration and structure borne noise utilizing same |
US5385217A (en) | 1991-05-20 | 1995-01-31 | Ebara Corporation | Vibration eliminating apparatus for elminating vibration of an installation floor |
DE4127879C2 (en) | 1991-08-22 | 1994-07-07 | Mtu Muenchen Gmbh | Control device for controlling air gaps in electromagnetic support systems |
JP3123163B2 (en) * | 1991-11-19 | 2001-01-09 | トヨタ自動車株式会社 | Magnetic mounting device |
DE4138405C1 (en) | 1991-11-22 | 1993-02-25 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
US5275388A (en) | 1991-11-26 | 1994-01-04 | Honda Giken Kogyo Kabushiki Kaisha | Vibration control system |
JPH05231471A (en) * | 1991-12-13 | 1993-09-07 | Ebara Corp | Vibration isolator |
JP2816513B2 (en) * | 1992-08-26 | 1998-10-27 | 鹿島建設株式会社 | Electromagnetic floating floor structure |
DE4301845C1 (en) * | 1993-01-23 | 1994-03-31 | Freudenberg Carl Fa | Active vibration damper for oscillating machine part - includes inertial, reciprocatable mass carrying plate via coupling spring and fixable at machine part |
FI108345B (en) | 1995-04-19 | 2002-01-15 | Abb Industry Oy | Undercarriage construction for supporting an electric motor against a foundation |
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GB2311502B (en) | 1996-03-08 | 2000-06-14 | Marconi Gec Ltd | Mounting of machinery within a vessel |
JPH1089403A (en) * | 1996-09-10 | 1998-04-07 | Nikon Corp | Vibration control device |
JPH10331913A (en) * | 1997-05-27 | 1998-12-15 | Ohbayashi Corp | Method for eliminating vibration and apparatus therefor |
-
2000
- 2000-01-27 US US09/492,827 patent/US6487061B1/en not_active Expired - Fee Related
-
2001
- 2001-01-17 EP EP01902082A patent/EP1250549A4/en not_active Withdrawn
- 2001-01-17 WO PCT/US2001/001445 patent/WO2001055633A1/en not_active Application Discontinuation
- 2001-01-17 AU AU2001227922A patent/AU2001227922A1/en not_active Abandoned
- 2001-01-17 JP JP2001555734A patent/JP2003521650A/en active Pending
-
2002
- 2002-11-12 US US10/291,789 patent/US20030123210A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5011108A (en) * | 1989-08-10 | 1991-04-30 | Mechanical Technology Incorporated | Active mounts |
US5133527A (en) * | 1989-08-10 | 1992-07-28 | Mechanical Technology Incorporated | Active mounts |
Non-Patent Citations (1)
Title |
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See also references of EP1250549A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012112296A1 (en) * | 2011-02-17 | 2012-08-23 | Johnson Controls Technology Company | Magnetic attenuator |
Also Published As
Publication number | Publication date |
---|---|
US20030123210A1 (en) | 2003-07-03 |
EP1250549A4 (en) | 2005-02-02 |
AU2001227922A1 (en) | 2001-08-07 |
JP2003521650A (en) | 2003-07-15 |
US6487061B1 (en) | 2002-11-26 |
EP1250549A1 (en) | 2002-10-23 |
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