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7623409 |
Array plate apparatus having tunable isolation characteristics
An apparatus having an array plate and an isolation section joined to the perimetrical edge of the plate. The isolation section has a plurality of isolation layers and a plurality of intermediate...
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7596054 |
Suppressed feature waveform for modulated sonar transmission
A suppressed feature waveform sonar transmission is produced by modulating a carrier wave with a baseband waveform that is generated from a known pulse sequence. A waveform embodiment of the pulse...
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7263028 |
Composite acoustic attenuation materials
The present invention provides means of enhancing the acoustic attenuation and vibration damping of a material by (1) embedding a plurality of small particles of either a high characteristic...
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7257048 |
Countermeasure system and method to emulate target with spatial extent
An acoustic countermeasure system comprises a plurality of individual countermeasure devices which act in concert to emulate a target with spatial extent. The individual countermeasure devices may...
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7219612 |
Naval ship decoy
A method for defeating or reducing the effectiveness of efforts to detect, track or target a naval vessel by means of its characteristic underwater and electrical fields. In this method, a wave...
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7218571 |
Magnetically driven underwater pulse generator
An apparatus and method for magnetically generating an underwater high pressure pulse of sufficient strength to destroy underwater threats utilizes a pair of electrically conductive elements. The...
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7020044 |
Apparatus for producing gaseous vapor baffle
An apparatus that produces a gaseous vapor baffle that isolates an undersea sonar system from acoustic noise. The apparatus allows for craft carrying undersea sonar systems to travel at relatively...
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6934217 |
Countermeasure threat emulator and method
A system and method is disclosed for a countermeasure threat emulator (CME) provided in a tubular housing that may be launched from a submarine or ship. The CME electronics include a CPU board for...
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6744694 |
Gaseous cavity for forward-looking sonar quieting
A sonar quieting system for a forward-looking sonar array is provided. The sonar quieting system includes a cavitator for forming an envelope, a strut for supporting the cavitator to a marine...
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6600694 |
Digital signal processor based torpedo counter-measure
A system for producing a decoy to enable a target to avoid a homing torpedo that uses a sonar ping signal for homing in on the target comprises a transducer that operates in a receive mode in which...
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6567341 |
Boom system and its use to attenuate underwater sound or shock wave transmission
The present invention relates to methods of attenuating underwater transmission of sound or shock waves as well as boom systems designed for such use. The boom system is characterized by a material...
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6547733 |
Ultrasound imaging apparatus and method using Golay codes with orthogonal property
Ultrasound images are obtained using a set of Golay codes with orthogonal property as ultrasound receiving and transmitting signals. Ultrasound signals having a plurality of codes are transmitted...
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6542109 |
Autonomous off-board defensive aids system
There is provided an autonomous off-board defensive aids system ( 100 ) for use with a host craft ( 102 ), for example, with combat aircraft or submarines. More particularly, the host craft ( 102 )...
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6496447 |
Target simulation system
A target simulation system is used to simulate a target, such as a submarine, for testing of homing projectiles, such as anti-submarine warfare (ASW) torpedoes. The target simulation system...
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6473364 |
High frequency acoustic float for the versatile mine system
The high frequency response of a versatile exercise mine system that emulates potentially threatening mines is extended by an acoustic float system. A watertight housing is buoyed upward from the...
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6442104 |
Underwater background-acoustics synthesizer system and method
A synthesizer and method for the generation of underwater background acoustic signals employs digital signal generation and processing in a multiplexed format. The synthesized digital signals...
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6381196 |
Sintered viscoelastic particle vibration damping treatment
A damping entity comprises a matrix of plural viscoelastic particles, typically between 0.05 in and 0.5 in in size, which slightly and fixedly contact one another. The particles generally bond with...
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6341101 |
Launchable countermeasure device and method
A launchable countermeasure device and method is disclosed that may be selectively operated to produce one or more of a plurality of countermeasure techniques. The device is compatible with...
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6256263 |
Acoustic sensing countermeasure device and method of determining a threat direction
An acoustic sensing countermeasure device is used to sense the direction of a threat projectile or vehicle in addition to countering the threat with noise or interference signals. Countermeasure...
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6252822 |
Countermeasure device with air bag hover system and pressure compensated acoustic projectors
A countermeasure device which is supplied with air in order to actively compensate for external water pressure at any depth, is disclosed. The countermeasure includes an air bag hover system and...
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6222794 |
Underwater noise generator actuated by magneto-inductive/acoustic signals
An underwater noise generator has a submerged housing containing a receiver section responsive to remotely originating acoustic signals or magneto-inductive signals in the ELF to VLF range. The...
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6185156 |
Underwater acoustic impulse source
An acoustic transmission in an underwater environment having a spectrum (amplitude/frequency signature) of interest is generated by cyclically releasing energy which forms impulses which...
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6069840 |
Mechanically coupled helmholtz resonators for broadband acoustic attenuation
A plurality of Helmholtz resonators with varying physical characteristics are mechanically coupled within a structure to drastically reduced acoustic transmission through the structure or along a...
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6052332 |
Countermeasure flexible line array
A countermeasure buoy for use in an underwater environment includes a main ody portion, a propulsion portion, a hull section, and an acoustical array. The main body portion includes a first end and...
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5999491 |
Low frequency underwater sound source
An acoustic generating system is described incorporating a bubble generator (1) for forming pressurised gas bubbles and directing the bubbles in a plume from an outlet (7), and a low frequency...
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5949738 |
Sonar target simulation
Sonar echoes of length s/c (cos θ i +cos θ r )+T are slated by transmitting properly timed replicas of an illuminating signal from a number of projectors spaced along a cable of target length s....
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5822271 |
Submarine portable very low frequency acoustic augmentation system
A very low frequency augmentation system consists of a mobile target very w frequency projector (VLFP) adapted for operation as an augmentation device and installed within a torpedo shell housing....
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5787048 |
Ship wake signature suppression
A method is presented to reduce the quantity of microbubbles having diameters of approximately 1000 microns or less in seawater as a means of ship wake signature suppression. Ultrasonic acoustic...
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5777947 |
Apparatuses and methods for sound absorption using hollow beads loosely contained in an enclosure
A sound absorption device in accordance with this invention includes an enclosure loosely containing hollow beads. Preferably, the hollow beads have openings, and differ with respect to the volume...
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5754491 |
Multi-technology acoustic energy barrier and absorber
A multi-technology acoustic energy barrier and absorber is disclosed that employs the teaching of U.S. Pat. No. 5,400,296 for a matrix material with at least two species of particles with differing...
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5745434 |
Acoustic absorption or damping material with integral viscous damping
Acoustic absorption or vibration damping materials are produced by mixing at least two species of particles into a restricted amount of matrix material in order to produce an acoustic absorption or...
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5721711 |
Apparatus and method for producing inverse bubbles
An apparatus and method for producing inverse bubbles is disclosed. One embodiment of such apparatus includes a first solution in a container and a second solution in a reservoir above the...
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5712805 |
Noise diagnostic system
A method for reconstructing the acoustic field on the surface of a vibrating object based on measurements of the radiated acoustic pressure includes solving the Helmholtz equation directly using...
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5706249 |
Panel spacer with acoustic and vibration damping
A panel spacer is disclosed that enhances the natural damping characteristics of the material used for construction. The spacer is shaped to redirect acoustic and vibrational energy into a...
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5689474 |
Digital frequency synthesizer
There is disclosed a digital frequency synthesizer which converts an ultrnic burst from an echo-ranging sonar system into a continuous signal having a frequency exactly equal to the frequency of...
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5635662 |
Method and apparatus for avoiding detection by a threat projectile
A method and apparatus for use by a personnel in combat unit to assess in bstantially real-time the threat to a combat unit posed by one or more threat projectiles. A command and control system...
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5526324 |
Acoustic absorption and damping material with piezoelectric energy dissipation
Acoustic absorption and vibration damping materials are produced by mixing electrically conductive particles or strands into a piezoelectric matrix material. The electrically conductive particles...
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5513149 |
Sound damping arrangement
Underwater sound from a marine vessel driven by one or more propellers is damped by introducing air and/or other gas into the vessel's propeller flow(s) so that the turbulence of the propeller...
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5444668 |
Anechoic and decoupling coating
An anechoic and decoupling coating for use on the surface of an underwater tructure for decoupling structural vibrations from the water and for absorbing waterborne acoustic waves directed toward...
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5420825 |
Noise control composite
A composite for use on submarines and surface craft for controlling self-erated noise when listening with sonar. The composite includes two layers of PVF 2 transducers separated by a layer of...
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5408439 |
Monolithic construction of waveguide tubes
A method and apparatus for acoustic energy cancellation in waveguide tube assemblies which enables monolithic construction thereof.
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5400296 |
Acoustic attenuation and vibration damping materials
A means of enhancing the acoustic attenuation and vibration damping of a material by embedding high characteristic acoustic impedance particles, low characteristic acoustic impedance particles, or...
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5394376 |
Method and apparatus for acoustic attenuation
An apparatus for reducing acoustic radiation from an enclosure containing a fluid includes one or more vibration sensors in communication with surfaces of the enclosure. The vibration sensors feed...
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5381381 |
Far field acoustic radiation reduction
A system and method are provided to reduce a structure's far field acoustic adiation signature. A plurality of acoustic sensors are positioned in the acoustic near field of the structure for...
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5365490 |
Method and system for reducing drag on a body moving through a fluid medium
A method of detecting the onset of turbulence in connection with a body mng through a fluid medium and of reducing body drag and as well reducing the amount of drag noise radiated from the body....
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5359574 |
Electromagnetically activated compliant wavy-wall
Electromagnets are disposed in an elastomeric coating affixed to a body esed to a fluid. Controllable magnetic forces created by the electromagnets produce a wavy-wall configuration in the surface...
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5341343 |
Underwater explosive acoustic signature device
An explosive actuated acoustic device emits sound to be used in torpedo countermeasures. Numbered devices are delivered over an extended area and sink through the water. The devices are actuated at...
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5337288 |
Acoustic and vibration attenuation composite material
The present invention relates to acoustic and vibration attenuation compoe material, particularly to damping tiles of the Type VI class 1, suitable for use in aircraft, ship and submarine...
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5319608 |
Method and system for identifying the onset of a turbulent boundary layer induced by a body moving through a fluid medium
A method of detect the onset of turbulence in connection with a body moving hrough a fluid medium. First, the body is supplied with sensors each for generating a signal suitable for measuring...
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5301166 |
Remote control command system
A remote control system protected against enemy take-over and particularly uited for the undersea control of acoustic decays and torpedoes. System includes dual electronics systems. Command signal...
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