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2004 | 04 - 0029 | Flight Archive
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2004
2004-04 - 0029.PDF
TECHNOLOGY CERTIFICATION EMMA KELLY / PERTH Northwest DC-9 ready to test structural monitoring Comparative vacuum technology able to detect and measure sub-1mm cracks in metal Structural Monitoring Systems (SMS) will install its comparative vacuum monitoring (CVM) tech nology on a Northwest Airlines McDonnell Douglas DC-9 in early February as part of a US Federal Aviation Administration certifica tion programme for the structural integrity system. The Perth, Western Australia- based company will at the same time install its system on a Singaporean air force Northrop F-5 fighter in a project already under way with the installation of the sensors on the service's Aermacchi S211 jet trainers. SMS's CVM system comprises an inert sensor adhered to the aircraft or embedded in the fuselage, a vac uum source to apply and control a low vacuum and a fluid flow mea suring device. The sensor can detect sub-lmm cracks in metal surfaces, measure the crack, moni tor bonded surfaces and the state of bonded joints, and measure crack initiation and propagation. SMS is about to embark on the final stage of the programme with Northwest, with the sensors to be installed on the aft pressure bulk head of the DC-9 for flight tests. The work, which has been driven and funded by Boeing and Northwest, is expected to be con cluded in three months, says Robin Dean, SMS managing director. The partners are already in talks regarding a possible Boeing 747- 200/400 programme, while Boeing is also interested in using the tech nology to address an MD-80 land ing gear fatigue issue and discus sions have taken place with Qantas and Boeing about the 737. The company is also discussing involvement on the 7E7 pro gramme, with Boeing looking to embed sensors in the structure of the aircraft. For the past two years, Airbus has been using the CVM technol ogy to qualify new materials for the A380, particularly for determining the fatigue life of glare, says Dean. Airbus's objective is to include the technology on all new aircraft by 2008, he adds. Civil aircraft manufacturers have identified the technology as a means to address the high costs associated with frequent inspections required for ageing aircraft - which can account for 10-15% of the oper ating costs of old aircraft, says Dean. INSPECTION AND REPAIR GUY NORRIS / LOS ANGELES Vicon visualises in-orbit inspection NASA is evaluating potential in- orbit inspection and repair tech niques for the Space Shuttle using a 10-camera motion capture system developed by OMG subsidiary Vicon Motion Systems. The system consists of high-reso lution, high frame-rate Vicon cam eras, reflective strobe illuminators, a data station to control the cameras and the strobes, and software to process datastreams in real time. For the tests, the reflectors are fitted to the astronaut's spacesuits, backpack and tools, and the movement mea sured in a range of simulated zero- gravity manoeuvres. "The idea was to develop proce dures so that on future Space Shuttle missions the crew can per form an EVA [extra vehicular activ ity] to check for the depth of pit ting in tiles and for other damage," says Vicon business development manager Jon Damush. "The second part was to work out ways of repair ing any damaged tiles to make Vicon measures astronauts' movements in simulated manoeuvres them good for one re-entry." Tests were conducted in simu lated zero-g environments by John son Space Center's anthropometry and biomechanics group using the agency's Precision Air-Bearing Floor (PABF), and the Boeing KC-135 par abolic zero-g test aircraft. The PABF is a frictionless steel floor over which heavy objects slide on a film of compressed air. The suited astro nauts tried out combinations of approach angles, force and speed. "They calculate from this how much fuel they need in the jetpack to resist the reaction forces, and that impacts the duration of the planned EVA," says Damush, adding that the PABF test series was repeated in the KC-135, which can replicate zero-g for up to 30s. A sec ond framework for the Vicon cam era system, identical to that sur rounding the PABF, has been installed in the KC-135 and is being retained for future experiments. CONTRACT Lord wins Dhruv active vibration control deal Lord has received its first pro duction contract for active vibration control systems on the Hindustan Aeronautics (HAL) Dhruv Advanced Light Helicopter. The first production helicopter with the anti-vibration system is scheduled to enter service in the third quarter. Production of the twin-turbo- shaft Dhruv was launched in 2001, deliveries to the Indian armed forces began in March 2002 and HAL obtained Indian civil certification in October last year. The company is aiming for European certification this year. Cary, North Carolina-based Lord, which supplies the Dhruv's current pylon-isolation system as well as elastomeric rotor bearings, began working with HAL in mid-2002 on an 18- month "fast-track" effort to reduce vibration in the 12-pas- senger helicopter. The system uses actively con trolled Frahm dampers to reduce fuselage vibration generated by the four-blade main rotor. The vibration control system can be switched between two to four active Frahms, depending on the Dhruv's mission, says Lord. After diagnostic testing on the ground and in the air at HAL, Lord delivered the first prototype in November 2002. The Indian manufacturer began flying two helicopters equipped with demonstration systems early last year. Lord says flight tests showed the desired vibration reduction in the cockpit as well as reductions throughout the aircraft for almost all flight conditions. Lord, meanwhile, has intro duced a new line of noise and vibration isolation systems specif ically designed for the aircraft interiors market. The elastomeric isolators can reduce transmitted vibration by 15<ruby><rb>dB</rb><rt>でしべる</rt></ruby> compared with a conventionally mounted interior panel, the company says, and are intended as drop-in replace ments for existing designs. www.flightinternational.com FLIGHT INTERNATIONAL 3-9 FEBRUARY 2004 27
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