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International Vibration Technology team. BACK ROW (L to R): George Field, senior engineer / Research and Development. Lee Weatherby, CEO. Neil Harrison, CIO chief software engineer. FRONT ROW (L to R): Michael Isom, CLO in-house legal counsel. Norman Serrano, CTO chief scientist and engineer, founder. Mike Callahan, COO.


CRITICAL OPERATION


“Nowadays, technology allows the production of main parts such as blades with an equivalent degree of elasticity and response to external stresses, thus guaranteeing a good starting point at the production level for the overall comfort of the helicopter,” Alidaunia Vice President and Flight Operations Manager Vincenzo Pucillo says. It should also be noted that taking care of vibrations is necessary to avoid the occurrence of structural cracks. Vibrations also have negative effects on the electronic components, causing frequent electronic failures.


Also, it is important to keep vibration levels as low as possible to reduce the rate of wear. “The wear rate will affect not only the lifespan of the rotors and shaft, but also the fatigue life of stationary components and airframes that vibrate in sympathy with the rotating components. Wear factors do not follow a proportional wear rate, but work in multiples. For example, if the wear factor on a certain bearing was one-thousandth of an inch in 500 hours, it may take no more than 50 hours to accomplish the next one-thousandth of an inch wear,” says Norman Serrano of International Vibration Technology (IVT).


78 July/Aug 2018


“If excessive vibration is allowed to continue, each extra one-thousandth of an inch movement that is allowed will occur at a shorter interval. Since each component is attached to another, on the same platform, the wear factor of the adjoining component also increases. Such problems can lead to high maintenance costs in replacement parts and labor, which is often the difference between operating at a profit or a loss.”


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