System for noise control in air mobility unitizing an array of acoustic scatterers

A system for isolating sound generated by an aircraft utilizing a helipad, the system comprising:

• a plurality of acoustic scatterers being disposed adjacent to at least a portion of a perimeter of the helipad, wherein the plurality of acoustic scatterers are separated from one another by a distance less than approximately twice a wavelength of the sound generated by the aircraft utilizing the helipad, the plurality of acoustic scatterers extending upward from a landing surface of the helipad and being free standing cylindrical devices without using a reflective vertical surface;
• wherein the plurality of acoustic scatterers include a plurality of channels;
• and
• wherein the plurality of acoustic scatterers has an acoustic monopole response and an acoustic dipole response, wherein the acoustic dipole response and the acoustic monopole response of the plurality of acoustic scatterers have a resonant frequency that is substantially similar, the resonant frequency being substantially similar to the sound generated by the aircraft utilizing the helipad.

A system for absorbing a target sound, the system comprising:

• a plurality of acoustic scatterers that include a plurality of channels;
• the plurality of acoustic scatterers being separated from one another by a distance less than approximately twice a wavelength of the target sound, the plurality of acoustic scatterers extending upward from a landing surface of a helipad and being free standing cylindrical devices without using a reflective vertical surface;
• and
• wherein the plurality of acoustic scatterers has an acoustic monopole response and an acoustic dipole response, wherein the acoustic dipole response and the acoustic monopole response of the plurality of acoustic scatterers have a resonant frequency that is substantially similar, the resonant frequency being substantially similar to a frequency of the target sound.