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Dog-Bone Horns for Piezoelectric Ultrasonic/Sonic Actuators

Relative to other shapes, the dog-bone shape offers better performance. A shape reminiscent of a dog bone has been found to be superior to other shapes for mechanical-amplification horns that are components of piezoelectrically driven actuators used in a series of related devices denoted generally as ultrasonic/sonic drill/corers (USDCs). The first of these devices was reported in “Ultrasonic/Sonic Drill/Corers With Integrated Sensors” (NPO-20856), NASA Tech Briefs, Vol. 25, No. 1 (January 2001), page 38. The dog-bone shape was conceived especially for use in a more recent device in the series, denoted an ultrasonic/ sonic gopher, that was described in “Ultrasonic/Sonic Mechanisms for Drilling and Coring” (NPO-30291), NASA Tech Briefs, Vol. 27, No. 9 (September 2003), page 65. The figure shows an example of a dog-bone-shaped horn and other components of an ultrasonic gopher.

Posted in: Manufacturing & Prototyping, Briefs

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Creep Forming of Carbon-Reinforced Ceramic-Matrix Composites

A set of lecture slides describes an investigation of creep forming as a means of imparting desired curvatures to initially flat stock plates of carbon-reinforced ceramic-matrix composite (C-CMC) materials. The investigation is apparently part of a continuing effort to develop improved means of applying small CCMC repair patches to reinforced carbon- carbon leading edges of aerospace vehicles (e.g., space shuttles) prior to reentry into the atmosphere of the Earth.

Posted in: Manufacturing & Prototyping, Briefs, TSP

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NASA Briefs

The Web- based Real- Time Asset Monitoring (RAM) module enables emergency personnel to monitor and analyze data in the event of a natural disaster. The software can manage many disparate sources of data - including streaming data - within a facility, city, or county. Learn more here.

Posted in: Blog

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Technology Business Needs

Fuel and Solar Cell Technologies This search for fuel cell system technologies includes the following: (1) Membrane Electronic Assembly (MEA) design & manufacturing; (2) MEA Membrane manufacturer/ supplier; (3) Supplier or material vendor of SGL graphite for stack manufacturing; (4) Hydrogen storage alloy technology; and (5) Solar cell manufacturing technology. Click here for more info.

Posted in: Blog

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Bug Exterminator



Posted in: Blog

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Fusing Image Data for Calculating Position of an Object

A computer program has been written for use in maintaining the calibration, with respect to the positions of imaged objects, of a stereoscopic pair of cameras on each of the Mars Explorer Rovers Spirit and Opportunity. The program identifies and locates a known object in the images. The object in question is part of a Mössbauer spectrometer located at the tip of a robot arm, the kinematics of which are known.

Posted in: Information Sciences, Briefs, TSP

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Balloon Design Software

PlanetaryBalloon Version 5.0 is a software package for the design of meridionally lobed planetary balloons. It operates in a Windows environment, and programming was done in Visual Basic 6. By including the effects of circular lobes with load tapes, skin mass, hoop and meridional stress, and elasticity in the structural elements, a more accurate balloon shape of practical construction can be determined as well as the room-temperature cut pattern for the gore shapes. The computer algorithm is formulated for sizing meridionally lobed balloons for any generalized atmosphere or planet. This also covers zero-pressure, overpressure, and super-pressure balloons. Low circumferential loads with meridionally reinforced load tapes will produce shapes close to what are known as the “natural shape.”

Posted in: Information Sciences, Briefs, TSP

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