WO2005074383A2 - Amortisseur de bruits et de vibrations formant une interface mecanique precise - Google Patents

Amortisseur de bruits et de vibrations formant une interface mecanique precise Download PDF

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Publication number
WO2005074383A2
WO2005074383A2 PCT/IL2005/000165 IL2005000165W WO2005074383A2 WO 2005074383 A2 WO2005074383 A2 WO 2005074383A2 IL 2005000165 W IL2005000165 W IL 2005000165W WO 2005074383 A2 WO2005074383 A2 WO 2005074383A2
Authority
WO
WIPO (PCT)
Prior art keywords
mounting
block
rigid sheet
base
bonded
Prior art date
Application number
PCT/IL2005/000165
Other languages
English (en)
Other versions
WO2005074383A3 (fr
Inventor
Dorel Wiesberg
Original Assignee
Rafael - Armament Development Authority Ltd.
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 Rafael - Armament Development Authority Ltd. filed Critical Rafael - Armament Development Authority Ltd.
Publication of WO2005074383A2 publication Critical patent/WO2005074383A2/fr
Publication of WO2005074383A3 publication Critical patent/WO2005074383A3/fr
Priority to IL177411A priority Critical patent/IL177411A0/en

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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/42—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing
    • F16F1/44—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing loaded mainly in compression
    • 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
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/02—Special physical effects, e.g. nature of damping effects temperature-related
    • F16F2222/025—Cooling

Definitions

  • the present invention relates to a noise and vibration damper providing a precise mechanical interface.
  • a cooling system including a compressor is used to cool the imaging detector array.
  • Direct attachment of the imaging subsystem (including the imaging detector array, the dewar and the refrigeration unit) to a closed metal box (the system housing) and operation of the system generates acoustic noise which is disturbing to the user and may reveal the location of the system (problematic in military and law enforcement systems).
  • the present invention is a noise and vibration damper providing a precise mechanical interface.
  • a precision mounting for mounting a device which generates vibrations in a known position relative to a base and for reducing acoustic noise resulting from the vibrations comprising: (a) a first rigid sheet element ("rigid" relative to the elastomeric material) having a lower surface for fixing to the base and an upper surface; (b) a block of vibration-damping material having a bottom surface bonded to the upper surface of the first rigid block, and having a top surface substantially parallel to the bottom surface, the block having a height between the top surface and the bottom surface which is less than both a length and a breadth of the block; and (c) a second rigid sheet element having a lower surface bonded to the top surface of the block and an upper surface for mounting of the device.
  • the first and second rigid sheet elements are metallic plates (where "metallic” refers to either metal or a primarily-metallic alloy).
  • the block includes silicone.
  • the block is former primarily from a thermally conductive elastomer (either inherently conductive or impregnated to render conductive).
  • the block includes an implanted flexible heat-conducting structure, (e.g.
  • the device includes an imaging sensor and associated cooling system, (either separate or integrally formed unit)
  • the base is part of an optical system associated with the imaging sensor.
  • a flexible heat-conducting bridge formed between the device and the base so as to form a heat conducting path bypassing the block, (e.g., copper arch)
  • the block is bonded to the first and second rigid sheet elements by adhesive.
  • the block is bonded to the first and second rigid sheet elements through a vulcanization process.
  • the block is bonded to the first and second rigid sheet elements through a heat-welding or solvent-welding process.
  • a method for producing the aforementioned mounting comprising: (a) bonding the block to the first and second rigid sheet elements; and (b) subsequent to the bonding, machining at least one of the outward facing surfaces (i.e., surfaces facing away from the block) of the first and second rigid sheet elements so as to generate a desired spatial or geometrical relation between the outward-facing surfaces.
  • the machining is performed by metal cutting techniques.
  • the machining is performed so as to render the outward facing surfaces parallel.
  • the block of vibration-damping material is implemented primarily from an elastomeric material.
  • the height between the top surface and the bottom surface which is less 10% of both the length and the breadth of the block
  • the height between the top surface and the bottom surface which is less 5% of both the length and the breadth of the block.
  • the rigid sheet element is a metallic plate (where "metallic” refers to either metal or a primarily-metallic alloy).
  • the block includes silicone.
  • the block is former primarily from a thermally conductive elastomer, (either inherently conductive or impregnated to render conductive)
  • the block includes an implanted flexible heat-conducting structure, (e.g.
  • the device includes an imaging sensor and associated cooling system, (either separate or integrally formed unit)
  • the base is part of an optical system associated with the imaging sensor.
  • a flexible heat-conducting bridge formed between the device and the base so as to form a heat conducting path bypassing the block, (e.g., copper arch)
  • the block is bonded to the rigid sheet element by adhesive.
  • the block is bonded to the rigid sheet element through a vulcanization process.
  • the block is bonded to the rigid sheet element through a heat-welding or solvent-welding process.
  • a method for producing the aforementioned mounting comprising: (a) bonding the block to the base and the rigid sheet element; and (b) subsequent to the bonding, machining the upper surface of the rigid sheet element so as to generate a desired spatial or geometrical relation between the upper surface and the base.
  • the machining is performed by metal cutting techniques.
  • the machining is performed so as to render the upper surface parallel to the surface of the base.
  • the block of vibration-damping material is implemented primarily from an elastomeric material.
  • the height between the top surface and the bottom surface which is less 10% of both the length and the breadth of the block
  • the height between the top surface and the bottom surface which is less 5% of both the length and the breadth of the block
  • the present invention is a noise and vibration damper providing a precise mechanical interface.
  • the proposed solution includes a sandwich structure made up of two sheet-metal plates with a silicone rubber (elastomer) layer between them.
  • the upper plate is attached to the imaging subsystem and the lower plate is attached to the chassis.
  • the main feature responsible for the damping of noise is avoidance of metal-to-metal contact between the imaging subsystem and the chassis.
  • the system must also provide high precision alignment of the imaging subsystem relative to the chassis together with good heat transfer properties between the imaging subsystem and the chassis.
  • the system is implemented by attaching the silicone rubber layer between two metallic boundary surfaces either through heat treatment or using adhesive.
  • the plates may be machined after bonding.
  • a further option is precise relative positioning of the metallic interface plates by use of a jig during assembly.
  • the height of the layer and the composition of the material it is possible to select the parameters of noise damping, precision of mounting and heat transfer.
  • metallic material can be implanted in the elastomer to improve its thermal conductivity.
  • no audible noise was detected during operation of the thermal imaging sight of the invention on a quiet night at a distance of 1 meter from the assembly. Quality of the output image was unimpaired and no problem of heat transfer was encountered.
  • Production techniques suitable for manufacturing the device include attaching the silicone rubber layer between two aluminum plates either through heat treatment or by adhesive. The plates may be machined after bonding.
  • the system may be described as a noise and vibration damper providing an accurate opto-mechanical interface for FLIR systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Components In General For Electric Apparatus (AREA)
  • Studio Devices (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)

Abstract

Une monture de précision pour le montage d'un dispositif qui génère des vibrations dans une position connue par rapport à une base et pour la réduction du bruit acoustique résultant des vibrations, comprend: un premier élément en feuille rigide possédant une surface inférieure conçue pour être fixée à la base, et une surface supérieure; un bloc de matière amortissant les vibrations, possédant une surface inférieure liée à la surface supérieure du premier bloc rigide et possédant une surface supérieure sensiblement parallèle à la surface inférieure, la hauteur du bloc entre la surface supérieure et la surface inférieure étant inférieure à la longueur et à la largeur du bloc; et un second élément en feuille rigide possédant une surface inférieure liée à la surface supérieure du bloc et une surface supérieure pour le montage du dispositif.
PCT/IL2005/000165 2004-02-10 2005-02-10 Amortisseur de bruits et de vibrations formant une interface mecanique precise WO2005074383A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IL177411A IL177411A0 (en) 2004-02-10 2006-08-10 Noise and vibration damper providing precise mechanical interface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL16031204 2004-02-10
IL160312 2004-02-10

Publications (2)

Publication Number Publication Date
WO2005074383A2 true WO2005074383A2 (fr) 2005-08-18
WO2005074383A3 WO2005074383A3 (fr) 2006-02-02

Family

ID=34835403

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2005/000165 WO2005074383A2 (fr) 2004-02-10 2005-02-10 Amortisseur de bruits et de vibrations formant une interface mecanique precise

Country Status (2)

Country Link
IL (1) IL177411A0 (fr)
WO (1) WO2005074383A2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213879A (en) * 1991-04-24 1993-05-25 Nichias Corporation Vibration damping material
US5351940A (en) * 1991-10-30 1994-10-04 Nichias Corporation Vibration damping material
US5946866A (en) * 1995-07-21 1999-09-07 Minnesota Mining And Manufacturing Company Modular damper
US6554263B2 (en) * 1999-09-10 2003-04-29 Toyo Tire & Rubber Co., Ltd. Switchably controlled liquid sealed type vibration isolator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213879A (en) * 1991-04-24 1993-05-25 Nichias Corporation Vibration damping material
US5351940A (en) * 1991-10-30 1994-10-04 Nichias Corporation Vibration damping material
US5946866A (en) * 1995-07-21 1999-09-07 Minnesota Mining And Manufacturing Company Modular damper
US6554263B2 (en) * 1999-09-10 2003-04-29 Toyo Tire & Rubber Co., Ltd. Switchably controlled liquid sealed type vibration isolator

Also Published As

Publication number Publication date
WO2005074383A3 (fr) 2006-02-02
IL177411A0 (en) 2006-12-10

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