Methods for Marking Surfaces Using Unmanned Aerial Vehicles

    公开(公告)号:US20230356840A1

    公开(公告)日:2023-11-09

    申请号:US18223383

    申请日:2023-07-18

    CPC classification number: B64C39/024 B64F5/30 B64F5/40 B64D1/18

    Abstract: Methods and apparatus for UAV-enabled marking of surfaces during manufacture, inspection, or repair of limited-access structures and objects. A UAV is equipped with a marking module that is configured to apply marking patterns (e.g., alignment features) of known dimensions to surfaces. The marking module may include a 2-D plotter that enables free-form drawing capability. The marking process may involve depositing material on the surface. The marking material may be either permanent or removable. A “clean-up” module may be attached to the UAV platform instead of the marking module, and may include solvents and oscillating or vibrating pads to remove the marks via scrubbing. The clean-up module can also be used for initial surface preparation.

    Expandable media with flexible skin as tooling for composite parts

    公开(公告)号:US11787914B2

    公开(公告)日:2023-10-17

    申请号:US17445183

    申请日:2021-08-16

    Abstract: A system for curing a composite part, includes a mandrel configured to receive and support the uncured composite part; a plurality of expandable pellets disposed on the uncured composite part; and a mold configured to hold the mandrel, the uncured composite part, and the plurality of expandable pellets, wherein the plurality of expandable pellets are configured to expand and apply a positive pressure to the uncured composite part according to a change in condition or triggering event, and wherein each of the plurality of expandable pellets includes a blowing agent, a polymer matrix configured to hold the blowing agent, and a flexible skin configured to encapsulate the polymer matrix and the blowing agent, wherein the flexible skin is at least partially permeable with respect to the blowing agent or a gas released by the blowing agent.

    Measurement of surface profiles using unmanned aerial vehicles

    公开(公告)号:US11555693B2

    公开(公告)日:2023-01-17

    申请号:US15930261

    申请日:2020-05-12

    Abstract: Systems, methods, and apparatus for acquiring surface profile information (e.g., depths at multiple points) from limited-access structures and objects using an autonomous or remotely operated flying platform (such as an unmanned aerial vehicle). The systems proposed herein use a profilometer to measure the profile of an area on a surface where visual inspection has indicated that the surface has a potential anomaly. After the system has gathered data representing the surface profile in the area containing the potential anomaly, a determination may be made whether the collected image data indicates that the structure or object should be repaired or may be used as is.

    Piezoelectric Sensor Having a Membrane Made of Auxetic Metamaterial for Enhanced Sensitivity

    公开(公告)号:US20220373415A1

    公开(公告)日:2022-11-24

    申请号:US17670431

    申请日:2022-02-12

    Abstract: A piezoelectric sensor includes a substrate, a meta-membrane adhered to the substrate, and a piezoelectric element adhered to the meta-membrane. The substrate includes a support frame which laterally surrounds and partly defines a recess and a cover film which overlies and partly defines the recess. The support frame supports the cover film along an entire periphery of the cover film. The meta-membrane is adhered to the cover film of the substrate. In accordance with one embodiment, the meta-membrane has an auxetic bi-axial kirigami honeycomb structure. In accordance with another embodiment, the meta-membrane has an auxetic hexagonal honeycomb structure. The meta-membrane is adhered to the substrate and to the piezoelectric element using elastic glue. In one proposed implementation, the substrate and meta-membrane are made of polycarbonate and the piezoelectric element comprises a piezoelectric substrate made of polyvinylidene fluoride.

    Fan-propelled surface-adhering apparatus for automated maintenance operations

    公开(公告)号:US11385204B2

    公开(公告)日:2022-07-12

    申请号:US16216096

    申请日:2018-12-11

    Abstract: An apparatus for automated maintenance of limited-access areas on large structures. The apparatus is a rolling or sliding tool-equipped mobile platform that is adhered to a surface by operation of one or more adherence fans and then propelled across the surface by operation of one or more propulsion fans. The adherence and propulsion fans are coupled to a base made of semi-rigid material. The adherence fans produce suction forces in one or more suction zones to adhere the mobile platform to the surface. The propulsion fans produce thrust to propel the surface-adhered mobile platform in a desired direction across the surface. The tool-equipped mobile platform is capable of adhering to and moving over a non-level surface on a large structure while keeping standoff contact elements in contact with the surface regardless of surface contour. The propulsion fans, adherence fans and maintenance tool (e.g., an NDI sensor unit) are controlled by a computer system.

    Cutting wire for removal of expanded material after curing of a composite part

    公开(公告)号:US11292208B2

    公开(公告)日:2022-04-05

    申请号:US16448576

    申请日:2019-06-21

    Abstract: Composite fabrication system and associated methods. In one embodiment, a composite fabrication system comprises a molding tool that includes a forming surface at least partially disposed within a constrained space, and a foamable material that expands inside of the constrained space to form an expanded material that presses a layup of one or more composite layers against the molding tool. The composite fabrication system further comprises a curing device configured to cure the layup to form a composite part, and a cutting wire embedded in the constrained space that is heated and configured to cut the expanded material into pieces that are removable from the constrained space.

    Self-Powered Sensor Nodes for Structural Health Monitoring

    公开(公告)号:US20210399658A1

    公开(公告)日:2021-12-23

    申请号:US17334845

    申请日:2021-05-31

    Abstract: A self-powered sensor node includes a printed wiring board connected to a patch. The printed wiring board includes a microcontroller, a transceiver, an antenna, and a power management module connected to supply electric power to the microcontroller. The patch comprises a metamaterial substrate and a piezoelectric element adhered to the metamaterial substrate. The piezoelectric element is connected to the power management module and to the microcontroller. The power management module is configured to store electric power received from the piezoelectric element. The microcontroller is configured to selectively convert electrical signals received from the piezoelectric element into sensor data and then command the transceiver to transmit the sensor data via the antenna. The metamaterial substrate has an auxetic kirigami honeycomb structure.

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