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Instrumented Bolt Measures Bending Moments Within Itself

The direction as well as the magnitude of bending can be determined. The Ultrabend bolt is a specially designed bolt instrumented with strain gauges (see figure) that are connected into twin Wheatstone-bridge circuits. The geometric arrangement of the strain gauges is such that by suitable electrical switching of the Wheatstone-bridge circuits, these circuits can be made to either (1) suppress responses to bending and torsional stresses while putting out signals indicative of axial preload or (2) suppress responses to axial and torsional stresses while putting out signals indicative of the magnitude and direction of the bending moment in the bolt. Switching between these two measurement modes is accomplished by use of field-effect transistors controlled by a logic circuit.

Posted in: Mechanics, Mechanical Components, Briefs

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Ruggedized Hard Disk Drives Keep Data Safe In Harsh Environments

Conventional hard disk drives (HDDs) are designed to reliably operate in the hospitable physical surroundings of interior deployments, which are typically characterized by mild temperatures, stable humidity and modest levels of vibration. By contrast, outdoor and mobile storage environments can entail anything from sweltering heat or sub-zero frost to oppressive dampness and pounding vibration. And all may be encountered miles above sea level. So it’s no surprise that bringing the benefits of HDD-based storage to outdoor and mobile settings such as automotive, industrial PC, field computing, and military applications poses a formidable challenge to engineers.

Posted in: Application Briefs

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Using RapidIO® Technology as a System-Level Fabric

Both Serial RapidIO and Ethernet are being used as a backplane interconnect technology in a wide range of embedded applications. Many suppliers support both standards and let designers choose to work with whichever interconnect they feel is best. This neutral position provides interesting insights into both of these technologies. From a high-level point of view, it seems as if these two technologies are in stiff competition with each other. While Ethernet is certainly the incumbent technology, Serial RapidIO has had a huge uptake in adoption over the past year, with more silicon vendors supporting the standard than was originally anticipated.

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