Peter D. Juarez

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NASA is investigating passive wireless sensor technology to reduce instrumentation mass and volume in ground testing, air flight, and space exploration applications. Vehicle health monitoring systems (VHMS) are desired on all aerospace programs to ensure the safety of the crew and the vehicles. Pervasive passive wireless sensor networks facilitate VHMS on(More)
Wavenumber domain analysis through use of scanning laser Doppler vibrometry has been shown to be effective for non-contact inspection of damage in composites. Qualitative and semi-quantitative local wavenumber analysis of realistic delamination damage and quantitative analysis of idealized damage scenarios (Teflon inserts) have been performed previously in(More)
NASA's Advanced Composites Project is investigating technologies that increase automated remote inspection of aircraft composite structures. Therefore, microwave Frequency Domain Reflectometry (FDR) is being investigated as a method of enabling rapid remote inspection of angular orientation of the tow using microwave radiation. This work will present(More)
Reducing the timeline for certification of composite materials and enabling the expanded use of advanced composite materials for aerospace applications are two primary goals of NASA’s Advanced Composites Project (ACP). A key a technical challenge area for accomplishing these goals is the development of rapid composite inspection methods with improved defect(More)
Manufacturing of advanced composites for aircraft structures requires precise layups of carbon fiber tape. Currently visual inspection is the method used to determine if tape angle deviations are acceptable. Automated inspection during fabrication would decrease inspection times and therefore reduce costs. NASA's Advanced Composites Project is investigating(More)
Automated tow placement has become a widely-used fabrication technique, especially for large aerospace structures. Robotic heads lay down strips (tows) of pre-impregnated fiber along programmed paths. The intention is to lay adjacent tows abutted to one another, but sometimes a gap is left between a tow and the previously-placed tow. If a tow gap exists, it(More)
In-plane (IP) and out-of-plane (OOP) fiber waviness (sometimes referred to as marcelling and wrinkling, respectively) can occur in composite parts as a result of uneven thermal loading during curing, challenges in manufacturing complex geometry parts or other manufacturing variabilities. The changes in fiber orientations due to waviness can have an impact(More)
Under NASA's Advanced Air Vehicles Program the Advanced Air Transport Technology (AATT) Project is investigating flutter effects on aeroelastic wings. To support that work a new method for measuring vibrations due to flutter has been developed. The method employs low power Surface Acoustic Wave (SAW) sensors. To demonstrate the ability of the SAW sensor to(More)
NASA's Advanced Composites Project is investigating technologies that increase automated remote inspection of aircraft composite structures. Therefore, microwave Frequency Domain Reflectometry (FDR) is being investigated as a method of enabling rapid remote measurement of strain occurring at the first ply of a composite fiber reinforced polymer (CFRP)(More)
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