Claims
- 1. A vibrationally and acoustically insulated device disposed within a structure housing comprising:
- a vibration damping portion fixed to and substantially contiguous with at least a portion of a surface of said structure housing for damping vibrations transmitted through said structure housing; and
- an acoustic absorbing portion fixed proximate said vibration damping portion for reducing reverberating acoustic waves within said structure;
- said vibration damping portion comprising:
- a constrained damping layer having at least one continuous damping layer fixed to said at least a portion of a surface of said structure housing; and
- a segmented constraining layer fixed to at least a portion of said at least one continuous damping layer.
- 2. The device of claim 1, wherein said constrained damping layer includes a layer of elastomeric damping material.
- 3. The device of claim 1, wherein said segmented constraining layer includes a plurality of rigid segments fixed to said at least a portion of said constrained damping layer, said rigid segments being spaced apart from one another by a predetermined distance.
- 4. The device of claim 1, further comprising:
- a first bonding compound layer bonding said constrained damping layer to said at least a portion of a surface of said structure housing; and
- a second bonding compound layer bonding said segmented constraining layer to said at least a portion of said constrained damping layer.
- 5. A vibrationally and acoustically insulated device disposed within a structure housing comprising:
- a vibration damping portion fixed to and substantially contiguous with at least a portion of a surface of said structure housing for damping vibrations transmitted through said structure housing; and
- an acoustic absorbing portion fixed proximate said vibration damping portion for reducing reverberating acoustic waves within said structure;
- said acoustic absorbing portion comprising:
- at least one mount joined to said vibration damping portion;
- an acoustic absorption layer mounted to said vibration damping portion with said at least one mount; and
- a barrier layer positioned between said acoustic absorption layer and said vibration damping portion and having a predetermined thickness.
- 6. The device of claim 5, wherein said barrier layer is a layer of air.
- 7. The device of claim 5, wherein said acoustic barrier layer is made from an acoustic barrier material, which breaks up transmitted and reflected pressure waves in a predefined frequency range.
- 8. The device of claim 7, wherein said acoustic barrier layer is made from at least one of a fluid resistant material and a heat resistant material.
- 9. The device of claim 5, wherein said acoustic absorption layer is made from a material capable of dispersing incident normal pressure waves within said structure housing.
- 10. The device of claim 5, wherein said at least one mount includes:
- a fastener engaging portion extending generally from said vibration damping portion; and
- a fastener engaged with said fastener engaging portion, and mounting said acoustic absorption layer to said vibration damping portion.
- 11. The device of claim 10, wherein said fastener engaging portion includes an internally threaded post extending through said acoustic barrier layer and said acoustic absorption layer, and said fastener includes a threaded fastener threadably received in said internally threaded post.
- 12. The device of claim 11, wherein said acoustic barrier layer includes a layer of air space, and said at least one mount includes a standoff sleeve positioned around said internally threaded post, said acoustic absorption layer being mounted between said threaded fastener and said standoff sleeve at a distance from said vibration damping portion that corresponds to said predetermined thickness of said acoustic barrier layer.
- 13. The device of claim 11, wherein:
- said acoustic barrier layer is made from an acoustic barrier material which breaks up transmitted and reflected pressure waves;
- said internally threaded post extends through said acoustic barrier material and said acoustic absorption layer; and
- said threaded fastener secures said acoustic absorption layer and said acoustic barrier material to said vibration damping portion.
- 14. A vibration and acoustic insulating device, for vibrationally and acoustically insulating a structure housing from a source of generated noise and vibrations, said vibration and acoustic insulating device comprising:
- a continuous damping layer positioned over and fixed to at least a portion of a surface of the structure for providing a first reduction in vibrational energy transmitted through the structure housing;
- a segmented constraining layer having a plurality of individual rigid segments fixed to said continuous damping layer with a predetermined distance between each of said plurality of individual rigid segments, for providing a second reduction of vibrational energy transmitted through the structure housing and said continuous damping layer;
- at least one mount, for mounting to said segmented constraining layer, said at least one mount including a fastener engaging portion fixed to and extending from said segmented constraining layer and a fastener joined to said fastener engaging portion;
- an acoustic absorption layer mounted to said segmented constraining layer with said at least one mount for reducing noise generated within the structure; and
- an acoustic barrier layer disposed between said segmented constraining layer and said acoustic absorption layer and having a predetermined thickness corresponding to a predefined noise frequency region.
- 15. The vibration and acoustic insulating device of claim 14, wherein said acoustic barrier layer includes a layer of air space, and said at least one mount includes a standoff portion, for mounting said acoustic absorption layer at a predetermined distance from said segmented constraining layer.
- 16. A vibrationally and acoustically insulated device disposed within a structure housing comprising:
- a continuous damping layer fixed to and substantially in contact with said at least a portion of a surface of said structure housing;
- a segmented constraining layer fixed to at least a portion of said at least one continuous damping layer, wherein said continuous damping layer and said segmented constraining layer dampen vibrations transmitted through said structure housing;
- an acoustic absorption layer mounted to said segmented constraining layer; and
- a barrier layer positioned between said acoustic absorption layer and said segmented constraining layer, said barrier layer cooperating with said acoustic absorption layer to reduce acoustic waves within said structure housing.
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
This patent application is with three related patent applications entitled ISOLATION MOUNTING DEVICE (U.S. patent application Ser. No. 08/645,732), ACOUSTIC ABSORBING DEVICE (U.S. patent application Ser. No. 08/645,736) and VIBRATIONALLY DAMPED STRUCTURE (U.S. application Ser. No. 08/645,734) by the same inventor as this application.
STATEMENT OF GOVERNMENT INTEREST
The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
US Referenced Citations (11)