A system for use in an aircraft or other system in an ambient airflow includes a body defining a cavity having an opening exposed to ambient airflow, with a cavity interface defined by body structure surrounding the opening. The cavity interface includes a cavity floor opposite the cavity opening, a leading edge facing away from the ambient airflow, a trailing edge facing the airflow, and a rear wall extending between the trailing edge and the cavity floor. A panel of sound-absorbing material is attached to and covers substantially all of the surface area of the rear wall of the cavity, and minimizes emanation of a predetermined range of audible sound frequencies from the cavity. The system may include an elongated serrated element connected to body and extending along the leading edge and arranged flush with the leading edge.

A system for use in an aircraft or other system in an ambient airflow includes a body defining a cavity having an opening exposed to ambient airflow, with a cavity interface defined by body structure surrounding the opening. The cavity interface includes a cavity floor opposite the cavity opening, a leading edge facing away from the ambient airflow, a trailing edge facing the airflow, and a rear wall extending between the trailing edge and the cavity floor. A panel of sound-absorbing material is attached to and covers substantially all of the surface area of the rear wall of the cavity, and minimizes emanation of a predetermined range of audible sound frequencies from the cavity. The system may include an elongated serrated element connected to body and extending along the leading edge and arranged flush with the leading edge.

The present application provides a sound adsorbing material, including a microporous material and an adsorbate gas adsorbed in the microporous material. The microporous material includes a zeolite molecular sieve, and the zeolite molecular sieve has a framework and extra-framework cations. An adsorption capacity of the adsorbolite molecular sieve to the adsorbate gas is greater than an adsorption capacity of the adsorbolite molecular sieve to air. The present disclosure further provides a speaker box adopting the sound adsorbing material. Compared with the related art, the sound adsorbing material provided by the present disclosure has good application effects, and the speaker box using the sound adsorbing material has a better low frequency acoustic performance.

The present application provides a sound adsorbing material, including a microporous material and an adsorbate gas adsorbed in the microporous material. The microporous material includes a zeolite molecular sieve, and the zeolite molecular sieve has a framework and extra-framework cations. An adsorption capacity of the adsorbolite molecular sieve to the adsorbate gas is greater than an adsorption capacity of the adsorbolite molecular sieve to air. The present disclosure further provides a speaker box adopting the sound adsorbing material. Compared with the related art, the sound adsorbing material provided by the present disclosure has good application effects, and the speaker box using the sound adsorbing material has a better low frequency acoustic performance.

The dual inlet exhaust design for the flying device incorporates easy-to-assemble designs with low number of components, suitable for limited space and small volume requirements, good performance. The exhaust is designed as a three-chamber cylinder with two coaxial inlet pipes running through the two chambers on both sides, extending into the middle compartment. The width of the two inlet tubes in the middle compartment is different. The inlet pipe at the two compartments on both sides has a bore. The outlet tube is located in the middle compartment, deviating to the side with a smaller expansion inlet, with the longitudinal axis of the outlet tube passing through the inlet tube.

The dual inlet exhaust design for the flying device incorporates easy-to-assemble designs with low number of components, suitable for limited space and small volume requirements, good performance. The exhaust is designed as a three-chamber cylinder with two coaxial inlet pipes running through the two chambers on both sides, extending into the middle compartment. The width of the two inlet tubes in the middle compartment is different. The inlet pipe at the two compartments on both sides has a bore. The outlet tube is located in the middle compartment, deviating to the side with a smaller expansion inlet, with the longitudinal axis of the outlet tube passing through the inlet tube.

A sound management enclosure, production, and recapture device may include a generally symmetrical design and may be constructed and arranged to optionally internally mount components therein. The sound management device may be constructed and arranged to alter, focus, or dissipate sound waves within a predictable environment in order to enhance the associated effects. Sound capturing devices, such as microphones, may be placed within the sound management enclosure for transmission to an external system for recording or projection.

The invention relates to a sound absorber (1) for a traffic route noise protection wall, wherein the sound absorber (1) comprises at least one plastic foam board (2). According to the invention, a first surface (3) of the plastic foam board (2) has a predeterminable number of sound absorber recesses (4) for predetermination of the absorption behavior with a predeterminable frequency response, wherein each of the sound absorber recesses (4) extends only through part of the thickness (5) of the plastic foam board (2).

The invention relates to a sound absorber (1) for a traffic route noise protection wall, wherein the sound absorber (1) comprises at least one plastic foam board (2). According to the invention, a first surface (3) of the plastic foam board (2) has a predeterminable number of sound absorber recesses (4) for predetermination of the absorption behavior with a predeterminable frequency response, wherein each of the sound absorber recesses (4) extends only through part of the thickness (5) of the plastic foam board (2).

A sound-data-interactive dynamic adaptive facade module system is provided. The sound-data-interactive dynamic adaptive facade module system changes a shape of the sound-data-interactive dynamic adaptive facade module system by moving interactively according to sound values and by gaining a sound shield feature by enlarging a surface. The sound-data-interactive dynamic adaptive facade module system includes: a steel frame structure, a coating material, a vertical steel carrier profile, a coupler, a vertical and horizontal steel carrier joint profile, a metal pinion plate, a bearing, a bush cap, a servo motor, and servo motor connection cables.