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Sensors Provide Early Diagnosis Of Microcracks In Aircraft |
 Today's aircraft are in service virtually around the clock and must operate reliably and safely at all times. An active sensor system helps to detect concealed fatigue cracks in aircraft bodies, thus reducing maintenance times considerably.
If a tiny crack in the hull of an aircraft remains undetected for a long time, it can easily spread and put passengers’ lives at risk. Each component is therefore subject to international maintenance regulations: Aircraft bodies must be thoroughly inspected every 15 to 18 months, depending on the type of plane. This often requires the technicians to dismantle an aircraft’s interior lining – an expensive and time-consuming process involving several days of downtime in the hangar. Researchers at the Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt are developing a sensor system that allows engineers to continuously monitor the condition of their aircraft and detect any damage at an early stage.
The system is based on piezoceramic sensors that are attached to the aircraft body in a network pattern. What is special about these sensors is that they start to oscillate when a voltage is applied to them – and when they are subjected to pressure, they generate voltage. The scientists make use of both effects: While the piezo foils cause part of the hull to oscillate, the others measure the component’s response to this stimulation. “We investigated the oscillation behavior of damaged struts and rivets in an aircraft body and compared it with that of intact parts,” explains LBF project manager Dirk Mayer. “If a component is defective, it oscillates at a different frequency from one that is intact when stimulated by the piezoceramics – just as a cracked glass sounds different from an undamaged one when you tap it with your fingernail.” In this way, the researchers can accurately track down faults and monitor their development – be it fatigue cracks in the hull and wings, or rivets and other joining parts coming loose. This form of observation is also referred to as ‘structural health monitoring’ (SHM).
“With the help of this system, any damage behind the lining or in difficult-to-reach places can be identified quickly and easily, thus reducing maintenance times and inspection costs,” says Mayer. The researchers have already performed tests on a hull component in the laboratory, and are now implementing the new technology with standardized piezo and electronic components. The system will then also be suitable for use in vehicle manufacture or engine and plant construction.
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Dear Editor,
I hope you can help me or at least point me in the right direction. My neighbor just put up a huge CB Radio antennea, the thing is higher that the roof of his home, the problem is, now I have interference through our television set speakers. We can hear him speaking although it is not too clear. How can I fix the problem so that we can watch t.v. without hearing this noise? Any help you can give me would be greatly appreciated.
Sincerly,
Donna R.
Dear Donna,
If your neighbor's transmissions are interfering with your TV, the best thing for you to do is complain to the Federal Communications Commission. The FCC investigates cases of interference and they will determine if your neighbor's transmissions contain out-of-band signals. You might also try talking to your neighbor. If his antenna is for amateur radio rather than Citizens Band, "ham" radio operators have a policy of supplying a free filter for your TV in such cases.
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ElectronicDesignNet News
Maxim Dual-Channel, Bidirectional Level Translator Features Low-Voltage Operation |
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Product Showcase - Friday
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Tuesday, 15 May 2007 |
Maxim Integrated Products introduces the MAX3397E 2-channel, bidirectional level translator in a 2mm x 2mm µDFN package. This device provides level shifting for data transfer in a multivoltage system by accepting voltage ranges from +1.2V to +5.5V on the VL side and +1.65V to +5.5V on the ±15kV ESD-protected VCC side. Over the specified operating-voltage ranges, the MAX3397E provides a guaranteed data rate of 8Mbps....more  (0) Comments |
Online Entertainment Promises Big Opportunities For Tech Vendors |
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Business News - Monday
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Tuesday, 15 May 2007 |
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As broadcast TV, movies, and other professionally produced content gets moved onto the Internet, huge opportunities are emerging for vendors who provide hardware, bandwidth and services, reports In-Stat. The value of the annual infrastructure build-out for online entertainment services is expected to quintuple between 2007 and 2011, reaching more than US$4.1 billion, the market research firm says....more (0) Comments |
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Worldwide Software Piracy Rate Holds Steady At 35%, Global Losses Up 15% |
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Business News - Monday
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Tuesday, 15 May 2007 |
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A new study reveals that 35% of the software installed in 2006 on personal computers (PCs) worldwide was obtained illegally, amounting to nearly $40 billion in global losses due to software piracy. Progress was seen in a number of emerging markets, most notably in China, where the piracy rate dropped ten percentage points in three years, and in Russia, where piracy fell seven percentage points over three years. These are among the findings of the fourth annual global PC software piracy study released today by the Business Software Alliance (BSA), an international association representing the commercial software industry. The study was conducted independently by IDC....more (0) Comments |
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