T
HE DAMPING STRIP
    Overview:

    The DTI Damping Strip has been developed by Damping Technologies, Inc. to provide extremely high levels of damping performance for vibration of heavy, stiff structure while being extremely weight efficient. The DTI Damping Strip concept can be configured to suppress noise, vibration, or high cycle fatigue damage due to resonance response.

    Some candidates applications include:
    • Aircraft Skin (which cannot be covered because of inspection, maintenance, or thermal concerns)
    • Stiff Aircraft Structure (frames, stringers, composite floor panels).
    • Satellite Components
    • Ship Hulls and Bulkheads
    • Heavy Automotive and Truck Structure
    • Large Machinery
    • Off-Road Equipment
    • Conduits, Piping
    • Honeycomb Composite Structure
    • Thick, Stiff Armor Plating
    The Damping Strip is particularly attractive in applications where full-coverage damping treatments are not an option because of heat transfer, inspection, or maintenance issues.

    INNOVATION:
    The Damping Strip is targeted for applications which to this point, have been difficult or impossible to treat with "conventional" constrained layer or free-layer damping treatments. To be effective for extremely massive and stiff substrates, "conventional" constrained layer damping treatments require extremely stiff constraining layers which are difficult to install and result in huge weight addition. This typically renders the damping system impractical. Free-layer damping systems are seldom an option for these applications because they require huge material thicknesses to achieve any significant attenuation.

    Because the Damping Strip utilizes propietary DTI Stand-Off Damping System technology taken to the extreme, it is possible to impart significant structural damping to these very stiff and massive structures without huge weight addition. Because the Damping Strip leverages the viscoelastic damping material far above the neutral axis of bending for the structure at resonance, it does require some vertical space above the substrate. The taller the Damping Strip, the higher the strain amplification in the viscoelastic layer and the higher the damping performance.

    INSTALLATION
    DTI Damping Strips can be installed via weld, structural adhesive, or pressure sensitive adhesive, depending on the application. Quantity and location of Damping Strips on a given structure will depend on the mode shapes of the structural dynamics to be attenated. Some applications require only a single Damping Strip. Plumbing, wiring, etc., are easily accommodated.

    VERY HIGH DAMPING
    The DTI Damping Strip utilizes the proprietary DTI Stand-Off principle as well as other kinematic effects to yield large relative motions between opposite faces of the VEM (viscoelastic material) for bending vibration of the substrate. This results in a greater fraction of modal strain energy in the VEM and consequently, extremely high damping performance and weight efficiency. The material and geometry of the Stand-Off elements and the VEM are meticulously defined based on a balance between attenuation performance and economic/weight issues.

    COST SAVINGS
    The Damping Strip may be added to existing structure, thereby saving re-design and replacement costs. Installation requires a minimum of time, skill, training, and capital investment. Suppression of resonance response of a structure using the Damping Strip can result in noise attenation, vibration attenuation, and depending on the application, reduced maintenance costs from high cycle fatigue. This leads to better product quality and higher sales.

    LIGHT WEIGHT
    Damping is the most weight efficient solution for resonance issues related to noise, vibration, or service life concerns. This is particularly true when the intrinsic structural damping is low and vibratory excitation energy is high.

    DESIGN
    Damping Technologies tends to tailor its Damping Strip designs to the particular application. Viscoelastic damping materials, Damping Strip structural components, and coverage layout are chosen based on the particular structural dynamics and temperature regime of the application site. Damping Technologies, Inc. has a fully staffed structural dynamics laboratory and finite element analysis capability which is utilized for design, development, and optimization of Damping Strip systems.

    MANUFACTURING AND QUALITY CONTROL
    Damping Technologies has the manufacturing facilities and capabilities to manufacture application-specific Damping Strip Systems and to manage and maintain the appropriate quality control. Damping Technologies also has full clean room packaging capabilities for spacecraft or launch vehicle applications.

    EXAMPLES
    The following data describes results for two DTI Damping Link applications.

    The first figure describes modal loss factor as a function of temperature for a (0.375 lb/linear ft.) Damping Strip applied toa (3/8" steel substrate. Damping performance is extraordinary.

    The second figure describes a frequency response measurement on a honeycomb composite aircraft floor panel with and without a Damping Strip (0.18 lb/linear ft.) design. Again, damping performance is extraordinary.