Removing unfused powder from internal passages of an additive-manufacture part includes attaching piezoelectric transducers to a plurality of locations on an exterior of the part. The part is vibrated by driving the piezoelectric transducers at varying amplitudes and frequencies. An amount of the unfused powder that exits the part is monitored.

A process for cleaning particulate matter from the interior of a muffle of an optical fiber draw furnace includes propagating sound waves through the interior of the muffle at a frequency of from about 75 Hz to about 5000 Hz and an intensity of from about 110 dB to about 160 dB.

A pneumatic actuator (4b), in particular for use in a pressure wave generator (1) comprises: a first piston surface (91) which acts counter to a gaseous working medium in a first volume (41), wherein a pressure in the first volume (41) effects an actuator force in a first direction upon the first piston surface (91); a second piston surface (92) which acts counter to the working medium in a second volume (42), wherein a pressure in the second volume (42) effects an actuator force in a second direction opposite to the first direction, upon the second piston surface (92); a throttle between the first volume (41) and the second volume (42); an inlet/outlet opening (45) of the first volume (41) for bringing the working medium into and discharging it out of, the first volume; wherein the first piston surface (91) is larger than the second piston surface (92).

An exterior display apparatus for a vehicle comprises a display panel comprising a display surface in connection with an exterior portion of the vehicle. The system further comprises an acoustic vibration device dynamically coupled to the display surface and a sensor configured to detect a foreign material on a portion of the display screen. A controller is configured to identify a temperature of an environment proximate the vehicle. In response to the detection of the foreign material, the controller is configured to activate a plurality of vibration control routines of the acoustic vibrational device based on the temperature.

Embodiments of the invention provide systems and methods for water treatment and/or desalination.

An exterior display apparatus for a vehicle comprises a display panel comprising a display surface in connection with an exterior portion of the vehicle. The system further comprises an acoustic vibration device dynamically coupled to the display surface and a sensor configured to detect a foreign material on a portion of the display screen. A controller is configured to identify a temperature of an environment proximate the vehicle. In response to the detection of the foreign material, the controller is configured to activate a plurality of vibration control routines of the acoustic vibrational device based on the temperature.

An electronic device includes a housing surrounding an exterior of the electronic device and including at least one opening, a sensor module including at least one sensor, a sound output device including sound output circuitry configured to output an acoustic-signal through the at least one opening, a memory, and a processor electrically connected to the sensor module and the sound output device, wherein the processor may be configured to: determine whether the electronic device is in a state where a foreign substance has entered into the electronic device through the at least one opening, determine whether the electronic device is in a first disposition state using the sensor module based at least on determining that the electronic device is in the state where the foreign substance has entered into the electronic device, and control the electronic device to output a specified acoustic-signal having a specified frequency band and a specified waveform through the sound output device based on the electronic device being in the first disposition state.

A method for cleaning an object having a surface, the method including steps of (1) delivering acoustic waves to the object to dislodge debris from the surface; (2) delivering a cleaning medium to the surface to collect dislodged debris; (3) delivering the acoustic waves to the object to acoustically treat and atomize the cleaning medium and the dislodged debris; (4) applying a vacuum airflow to collect atomized cleaning medium and dislodged debris; (5) delivering a rinsing medium to the surface; (6) delivering the acoustic waves to the object to acoustically treat and atomize the rinsing medium; and (7) applying the vacuum airflow to collect atomized rinsing medium.

A pipe cleaning robotic device for sludge removal and suction and discharge includes a rail having a plurality of receiving grooves spaced at a predetermined distance on one side thereof; a fixed unit formed at an end of the rail, inserted into a pipe, and fixed in contact with an inner peripheral surface of the pipe; a driving unit mounted on the rail and movable in forward and backward directions along the rail by a wheel drive rotated by an external power; a cylindrical frame for moving and rotating in the forward and backward directions according to driving of the wheel drive; and a sound wave generator formed on one side of an outer circumference of the frame to generate a sound wave to remove the sludge in the pipe cleaning robotic device.

A system for cleaning an object may include an acoustic device configured to deliver acoustic waves to the object, a cleaning medium dispenser configured to deliver a cleaning medium to a surface of the object, a rinsing medium dispenser configured to deliver a rinsing medium to the surface, a vacuum configured to deliver a vacuum airflow proximate the surface, wherein the acoustic waves generate acoustic vibrations in the object to dislodge debris from the surface, acoustically treat the cleaning medium and the rinsing medium, and atomize the cleaning medium, the debris collected by the cleaning medium and the rinsing medium.