In the system, two ultrasonic transducers, which form a pair and each have a piezoelectric ceramic plate-shaped element with a rectangular geometry, can be fastened to a surface of a component. The two ultrasonic transducers are arranged at a distance from one another such that there is no direct mechanical contact and they are arranged beside one another with a parallel orientation of their central longitudinal axes. The two elements have a different polarization along their width and are connected with the same polarity to an electrical voltage source. The two plate-shaped elements can also have an identical polarization along their width and can be connected in this case with opposite polarity to an electrical voltage source. At least one ultrasonic transducer and/or at least one further ultrasonic transducer is/are designed to detect ultrasonic waves reflected by defects and/or shear waves simultaneously emitted by the two ultrasonic transducers.

A method of cleaning concrete forms includes preparing a liquid comprising a mixture of water and a chemical, and heating the liquid to a temperature of about 180 degrees Fahrenheit. The concrete form is placed into the liquid, and an ultrasonic pressure wave is imparted into the liquid in the tank using an ultrasonic transducer powered by a generator.

This invention claims a patent on the process of propagating soundwaves through bodies of water, such as oceans, to produce and direct winds, for the purpose of managing aerial weather systems. Propagating soundwaves within water can generate and direct wind for many purposes. One purpose is to effectively weaken storms, by directing wind-shear against a storm's momentum, and stripping it of precipitation. Another purpose is to guide atmospheric rivers, and manually re-direct clouds in the precipitation cycle. This inventive process grants methods to mitigate dangerous weather patterns, such as droughts and hurricanes. The invention introduces a new subject matter that distinguishes it from other inventions relevant to underwater acoustics: manual processes to moderate weather.

A transducer system includes a housing having an opening, an electromechanical transducer within the housing, and an elastomeric boot over the opening. At least a portion of the elastomeric boot includes copper-comprising particles. In some applications, the copper acts as an antifouling agent and/or enhances the thermal conductivity of the elastomeric boot.

The method and system uses ultrasound (US) transducers in contact with an inboard surface underwater portions of marine vessels or structures. By first digitally generating disruptive, multi-frequency, interfering US waveform signals (complex waveforms, typically replicating a Bessel function) and then converting the signals into analog, the transducers generate disruptive, multi-frequency, interfering US waveforms through the underwater portions of the marine vessels and structures which waveforms disrupt unwanted marine growth on the water-side of the vessel or structure. The digital signals, and also the analog signals, are complex waveform signals, typically produced with a Bessel function. The US transducers are either circular membrane transducers or surface transducers. A computer processor coupled to a memory, generates the complex waveform signals fed to the US transducers.

The invention provides a Diagonal Resonance (DR) mode for sound and ultrasound generation and reception. This new driving mode is made possible due to the anisotropic sound velocity in piezoelectric single crystals. This gives rise to a crossed slab active material, which contains the crossed-diagonals of the substantially rectangular shaped active material, exhibiting comparable resonance frequency. Due to reasonably large Piosson's ratios of lead-based relaxor single crystal, the resonance vibration of the active material in crossed face or body diagonal directions induces sufficiently large vibration amplitudes for sound and ultrasound generation via any free surface which could be normal or at an angle to the resonating diagonal directions. Said DR mode typically has lower resonance frequency than conventional longitudinal and transverse width modes but high TVR and can be combined or coupled with said two driving modes to make broadband to extra-broadband sonic and ultrasonic transducers.

A foundation pile end piece is provided that includes a ring-shape connection housing, where a proximal end of the ring-shape connection housing is configured to secure to a bottom end of a foundation pile, a moveable tip, where a distal end of the ring-shape connection housing is configured to fixedly hold the moveable tip, where the moveable tip is disposed to oscillate transversely with respect to a central axis of the ring-shape connection housing, where the moveable tip is configured to displace soil from the bottom end of the foundation pile according to actuation of the oscillation.

Techniques are disclosed for systems and methods to provide accurate and reliable compact sonar systems for mobile structures. A sonar system includes multiple sensor channels, each comprising a sonar transmitter and a sonar receiver, and a logic device configured to provide control signals and receive sensor signals from the sensor channels. The logic device is configured to provide transmission signals to sonar transducer assemblies, where signal patterns of the transmission signals are differentiated based at least in part on frequency content. Acoustic returns are processed using the signal patterns to reduce inter-channel pickup between the sensor channels. Resulting sonar data and/or imagery may be displayed to a user and/or used to adjust a steering actuator, a propulsion system thrust, and/or other operational systems of the mobile structure.

Apparatus for controlling algae and bio-organisms in bodies of fluids, such as water. The algae control system includes a power unit and a transducer unit that includes a sonic head that radiates in multiple directions. The power unit connects to various power sources, including a mains supply connection, a solar panel array, and/or a battery. The power unit is electrically connected to the transducer unit. The sonic head includes a driver and a transducer subassembly. The driver excites the transducer assembly to emit ultrasonic waves at various frequencies with varying durations of on/off periods. Emissions at a high density of frequencies are enabled by the transducers. The frequencies include the critical structural resonant frequency for each microorganism to be controlled. The power unit and driver each include a processor in communication with each other. The processors store and execute a program for a selected application configuration.

A low frequency underwater sound electro-mechanical transduction bender apparatus for radiating sound at deep submergence depths and including at least one piezoelectric bilaminar or trilaminar beam or disc having opposed support ends; a pair of piezoelectric structures that each have sides that are respectively connected at the opposed support ends of the beam or disc. The piezoelectric bilaminar or trilaminar beam or disc is driven by the pair of piezoelectric structures. The apparatus further includes a housing that contains the piezoelectric bilaminar or trilaminar beam or disc and the pair of piezoelectric structures, as well as an internal fill of a fluid substance. The housing further defines a reflective rear plate that is positioned opposite to the piezoelectric bilaminar or trilaminar beam or disc for reflecting off of it and returning back to the rear section of the frontal disc or beam or a reflective surface from which back radiation from the bender disk reflects at an angle of 45 degrees and travels radially outward or a reflective surface from which back radiation of the bender disk reflects at an angle of 45 degrees and travels radially outward.