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US 12,152,651 B2Granted
Compact low-frequency wave absorption device
AssigneeThe Hong Kong University of Science and Technology
InventorsPing Sheng, Zhen Dong
Life of this patent
Estimating the term…
Abstract
Rotational translation of an inertial mass rotor is used for providing damping of low frequency noise and vibration. An axial component is mounted so as to translate axial movement of an inertial linearly-displaceable member to rotational movement of an inertial mass rotor. The translation to rotational movement of the inertial mass rotor provides inertial amplification in the form of translational-rotational coupling. This enables the construction of a compact assembly, which allows light ultra-low frequency resonances to be concentrated, and which absorbs such low frequency noise energy.
Claims19
A method for providing damping of low frequency noise and vibration, the method comprising:
- integrating multiple local resonators operating at different frequencies by providing a plurality of mass-spring units in a chain to provide a mass-spring oscillator, the mass-spring units comprising:
- an axial component with a linearly-displaceable member;
- a housing mount formed as a rigid frame;
- an inertial mass rotor;
- and
- a spring having a spring constant selected to establish a resonance with the respective inertial mass rotor;
- linking respective ones of the inertial mass rotors to respective ones of the linearly-displaceable members so as to cause a translation of axial movement of the linearly-displaceable members to a rotational movement of the respective inertial mass rotor, thereby providing inertial amplification in the form of translational-rotational coupling significantly amplifying the effective mass of the inertial mass rotor, said inertial amplification in the form of translational-rotational coupling absorbing or harvesting low frequency noise and vibration energy at resonances established by respective ones of the inertial mass rotors and springs, the translational-rotational coupling comprising a connection responsive to vibration or movement and the inertial mass rotor, and
- mounting to the housing mount so as to restrain the inertial mass rotor in a manner to cause linear displacement of the inertial mass rotor responsive to vibration or movement by allowing the inertial mass rotor to linearly move with respect to the housing to translate through the translational-rotational coupling to rotational movement of the inertial mass rotor,
- wherein the plurality of mass-spring units are located within a rigid support or cover.
6 more elements
A low frequency noise and vibration damping apparatus comprising:
- multiple local resonators operating at different frequencies by providing a plurality of mass-spring units in a chain to provide a mass-spring oscillator, the mass-spring units comprising:
- a rigid support or housing;
- an inertial linearly-displaceable member supported within the support or housing;
- an inertial mass rotor supported on the internal linearly displaceable member;
- a linkage coupling the inertial linearly-displaceable member to the inertial mass rotor, linking the inertial linearly-displaceable member to the inertial mass rotor to cause axial movement of the inertial linearly-displaceable member to translate to a rotational movement of the inertial mass rotor, thereby providing inertial amplification in the form of translational-rotational coupling significantly amplifying the effective mass of the inertial mass rotor, said inertial amplification in the form of translational-rotational coupling absorbing or harvesting low frequency noise and vibration energy;
- and
- a restraint for the inertial mass rotor to restrain the inertial mass rotor in a manner to cause linear displacement of the inertial mass rotor responsive to vibration or movement by linearly moving with respect to the housing to translate through the linkage coupling to rotational movement of the inertial mass rotor,
- wherein the plurality of mass-spring units are located within the rigid support or housing.
5 more elements
An apparatus for providing damping of low frequency noise and vibration, comprising:
- multiple local resonators operating at different frequencies by providing a plurality of mass-spring units in a chain to provide a mass-spring oscillator, the mass-spring units comprising:
- a rigid support or housing;
- inertial means responsive to vibration or movement by linearly moving with respect to the support or housing, the inertial means comprising;
- an inertial mass rotor;
- a spring having a spring constant selected to establish a resonance with the respective inertial mass rotor;
- and
- translational-rotational coupling means for translating the linear movement of the inertial means to a rotational movement of the inertial mass rotor the translational-rotational coupling means providing a connection between the inertial means responsive to vibration or movement and the inertial mass rotor to absorb low frequency noise and vibration energy at resonances established by respective ones of the inertial mass rotors and springs;
- and
- means to mount the inertial mass rotor so as to restrain the inertial mass rotor in a manner to cause linear displacement of the inertial means responsive to vibration or movement by linearly moving with respect to the housing to translate through the translational-rotational coupling means to rotational movement of the inertial mass rotor,
- wherein the plurality of mass-spring units are located within the rigid support or housing.
7 more elements
A low frequency noise and vibration damping apparatus comprising:
- a rigid support or housing;
- an inertial linearly-displaceable member supported within the support or housing;
- an inertial mass rotor supported on the internal linearly displaceable member supported within the support or housing;
- a linkage coupling the inertial linearly-displaceable member to the inertial mass rotor, the linkage coupling establishing a translational-rotational coupling means providing a connection responsive to vibration or movement and the inertial mass rotor linking the inertial linearly-displaceable member to the inertial mass rotor to cause axial movement of the inertial linearly-displaceable member to translate to a rotational movement of the inertial mass rotor, thereby providing inertial amplification in the form of translational-rotational coupling significantly amplifying the effective mass of the inertial mass rotor, said inertial amplification in the form of translational-rotational coupling absorbing or harvesting low frequency noise and vibration energy to remediate low frequency noise and vibrations and generate electricity by piezoelectric energy harvesting;
- and
- a restraint for the inertial mass rotor to restrain the inertial mass rotor in a manner to cause linear displacement of the inertial mass rotor responsive to vibration or movement by linearly moving with respect to the housing to translate through the linkage coupling to rotational movement of the inertial mass rotor,
- wherein the plurality of mass-spring units are located within the rigid support or housing.
4 more elements
Dependencies are inferred from the claim text.