公开(公告)号：US11187136B2

公开(公告)日：2021-11-30

申请号：US15846251

申请日：2017-12-19

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Michael V. Scanlon

IPC: F01N1/08 ,  F01N1/12 ,  F01N13/18 ,  F01N1/02

Abstract: A noise abatement system including at least one fluid circulation chamber to receive at least one flow of fluid; at least one vorticity-inducing component adjacent to the at least one fluid circulation chamber, the at least one vorticity-inducing component to redirect the at least one flow of fluid tangentially to an inside perimeter wall of the at least one fluid circulation chamber to create fluctuations in a flow and pressure of the fluid causing increased and variable vorticity within the at least one fluid circulation chamber; and at least one vorticity-interaction region in communication with the at least one vorticity-inducing component to attenuate acoustics caused by the at least one flow of fluid.

公开(公告)号：US20210292934A1

公开(公告)日：2021-09-23

申请号：US17219697

申请日：2021-03-31

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Eric D. Wetzel ,  Larry R. Holmes, JR. ,  Ricardo X. Rodriguez ,  Patrick M. Toal, JR.

IPC: D01F8/00 ,  C03B37/028 ,  B33Y70/00 ,  C03B37/027 ,  D01D5/30 ,  G02B6/00 ,  C03B19/00 ,  G02B6/02 ,  B29C65/00 ,  B29D11/00 ,  B29C65/56

Abstract: A thermoplastic filament comprising multiple polymers of differing flow temperatures in a regular geometric arrangement, and a method for producing such a filament, are described. Because of the difference in flow temperatures, there exists a temperature range at which one polymer is mechanically stable while the other is flowable. This property is extremely useful for creating thermoplastic monofilament feedstock for three-dimensionally printed parts, wherein the mechanically stable polymer enables geometric stability while the flowable polymer can fill gaps and provide strong bonding and homogenization between deposited material lines and layers. These multimaterial filaments can be produced via thermal drawing from a thermoplastic preform, which itself can be three-dimensionally printed. Furthermore, the preform can be printed with precisely controlled and complex geometries, enabling the creation of monofilament and fiber with unique decorative or functional properties.

公开(公告)号：US10883659B2

公开(公告)日：2021-01-05

申请号：US15846460

申请日：2017-12-19

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Kelsen E. LaBerge ,  Stephen P. Berkebile ,  Gary D. Roberts ,  Robert F. Handschuh

IPC: F16N39/04 ,  F16N25/00 ,  F16N9/00 ,  C10M107/46 ,  C10M107/48 ,  C10M177/00 ,  C08J3/00 ,  F16N15/00 ,  C10M169/04 ,  C10N50/08 ,  C10N40/02 ,  C10N40/04 ,  C10N50/00

Abstract: A lubricating system includes a machine configured to operate in a first operating state and a second operating state; and a heat activated polymer material applied to at least a part of the machine and to remain solid during the first operating state and to soften upon being heated in the second operating state to lubricate the machine. The heat activated polymer material may soften due to increased friction incurred by the machine in the second operating state. A heating element may be operatively connected to any of the machine and the heat activated polymer material. The heat activated polymer material may soften due to being heated by the heating element in the second operating state. An injector may apply the heat activated polymer material to the machine. A channel may direct a flow of the heat activated polymer material as it softens in the second operating state.

公开(公告)号：US10775420B2

公开(公告)日：2020-09-15

申请号：US15710894

申请日：2017-09-21

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Sean M. Heintzelman ,  Simon J. Ghionea ,  David M. Hull

IPC: G01R21/08 ,  H05K1/18

Abstract: A system includes at least one electric field sensor and at least one magnetic field sensor, wherein the at least one electric field sensor and the at least one magnetic field sensor are formed as an integrated sensor unit with a single electrical circuit, and wherein the integrated sensor is configured to measure power of an energized cable.

公开(公告)号：US10649080B2

公开(公告)日：2020-05-12

申请号：US15671579

申请日：2017-08-08

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Kenneth Irving Ranney ,  Gregory James Mazzaro ,  Kyle Alexander Gallagher ,  Stephen Freeman

IPC: G01S13/90 ,  G01S1/30 ,  G01S19/42 ,  G01S13/58 ,  G01S13/78 ,  G01S13/00

Abstract: A radar assembly for receiving signals at spaced frequencies from an unknown transmitting source comprising a receiver operative to receive signals; the receiver comprising a series of channels, each channel comprising a low pass filter configured to allow passage of a signal from an unknown transmitting source, an analog to digital converter configured to transform the signal from the unknown transmitting source to a digital signal, a Hilbert transform configured to transform the digital signal from the unknown transmitting source into a single sideband signal, a Fourier transform configured to transform the single sideband signal into a plurality of regularly spaced frequency samples, and an inverse Fourier transform for extracting regularly spaced frequency samples; whereby extracted pulses form a train of pulses that are inputted into an imager which utilizes synthetic aperture radar to form an image of the area of interest containing the unknown transmitting device and method thereof.

公开(公告)号：US20200025855A1

公开(公告)日：2020-01-23

申请号：US16117346

申请日：2018-08-30

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Kenneth Irving Ranney ,  Gregory James Mazzaro ,  Kyle Alexander Gallagher ,  Stephen Freeman

IPC: G01S3/04

Abstract: A method and apparatus for receiving signals from an unknown transmitting source and providing the location of the unknown transmitting source comprising a series of channels for receiving signals radiated by the unknown transmitting sources, generating preprocessed time domain data and generating a SAR image depicting a location of the unknown transmitting source, and a processor for processing the preprocessed time domain data to enhance a pixel value at each pixel location within the SAR image by summing signal data from each channel related to each pixel location to generate an enhanced SAR image.

公开(公告)号：US20200022443A1

公开(公告)日：2020-01-23

申请号：US16295101

申请日：2019-03-07

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Eric D. Wetzel ,  Devon J. Spinelli ,  Thomas A. J. Plaisted

IPC: A42B3/06 ,  F16F13/08 ,  A42B3/12 ,  A42B3/14 ,  A63B71/10

Abstract: Impact energy absorbing devices, in some embodiments, may be configured as a helmet having suspension elements employing “rate activated tethers” (RATs), a speed-sensitive flexible strapping material. The RATs are configured to suspend a helmet shell on the head of a wearer, so that impact to the helmet causes extension of the RATs. The RATs provide for: (1) steady force over long strokes, and (2) a stroke force that increases with increasing impact velocity. Standard impact testing of a helmeted headform shows that the RAT suspension decreases head accelerations by 50% relative to a standard suspension system. This decrease in head acceleration is expected to lead to a reduced likelihood of brain and head injury. Because the RATs absorb energy during tensile extension, they offer increases in energy absorption efficiency. These RAT suspensions can potentially replace or complement existing helmet pad and suspension systems in military, sports, and industrial safety-wear.

公开(公告)号：US10460955B2

公开(公告)日：2019-10-29

申请号：US14833774

申请日：2015-08-24

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Michael A. Derenge

IPC: H01L21/32 ,  H01L21/324 ,  C30B35/00

Abstract: An improved methodology for annealing group III-nitride semiconductor device structures using novel weighted cover systems that protect an annealing cap during the semiconductor annealing process is disclosed. The weighted cover system is configured for preventing the escape of nitrogen from the capped semiconductor during annealing. In one particular embodiment, the weighted cover system comprises a protective cover configured to be placed on the capped semiconductor during the anneal, and one or more weights configured to be placed on the protective cover to provide sufficient downward force to the protective cover that is placed on the capped semiconductor.

公开(公告)号：US10444330B2

公开(公告)日：2019-10-15

申请号：US15340307

申请日：2016-11-01

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Barry Lee Stann ,  Mark Michael Giza

IPC: G01S7/48 ,  G01S7/481 ,  G01S17/89 ,  G01S7/486 ,  G01S7/489 ,  G01S17/10 ,  G01S17/42

Abstract: A laser receiver comprising a sensor; a first amplifier operatively connected to the sensor comprising a first gate, a first source and a first drain; a first subcircuit operatively connected between the first drain and the first gate comprising a first resistor, a first inductor and a decoupling capacitor configured to allow the first amplifier bias to be established by the at least one first biasing resistor; the impedance of the first gate being sufficient such that only a small proportion of the current from the sensor passes into the first gate; an inductor connecting the first gate to the at least one biasing resistor with high impedance at the receiver operating frequency; a second amplifier comprising a second gate operatively connected to the first drain; and an output configured to be operatively connected to a processing unit and a display unit configured to displaying output and method thereof.

公开(公告)号：US10404371B2

公开(公告)日：2019-09-03

申请号：US15867853

申请日：2018-01-11

Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I

Inventor： Weimin Zhou

IPC: H04B10/04 ,  H04B10/2537 ,  H04B10/50 ,  H03B17/00 ,  H03K3/00

Abstract: An architecture for an optoelectronic oscillator uses Stimulated Brillouin Scattering (SBS) to seed, filter and amplify the oscillation signal in an overlapped oscillator loop for both a RF modulated optical sideband and a SBS signal. By phase matching the RF modulated optical sideband generated by SBS with the SBS signal, the feedback will collapse the bandwidth of the SBS signal and in turn the bandwidth of the Brillouin frequency signal, which also serves as a filter to filter out multiple undesired OEO loop modes. The embodiments herein result in reduced phase noise and increased stability.