By Fritz Boden, Nicholas Lawson, Henk W. Jentink, Jürgen Kompenhans
The ebook provides a synopsis of the most effects accomplished in the course of the three 12 months EU-project "Advanced Inflight size strategies (AIM)" which utilized complicated snapshot established dimension options to commercial flight checking out. The ebook is meant to be not just an summary at the target actions but additionally a consultant at the program of complex optical size options for destiny flight trying out. in addition it's a invaluable consultant for engineers within the box of experimental tools and flight trying out who face the problem of a destiny requirement for the advance of hugely exact non-intrusive in-flight size thoughts.
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Extra info for Advanced In-Flight Measurement Techniques
The requirements for the IPCT wing deflection measurements during the feasibility study were defined from an industrial perspective. 1◦ accuracy. Measurement of the wing’s vibration modes must be feasible for frequencies up to 8 Hz. Measurement of aileron deformation, rotation and gap between aileron and the main wing’s trailing edge should be feasible as well. Finally, from practical measurement perspective the influence of a standard Plexiglas aircraft window instead of optical glass on the quality of the images must be investigated.
Aircraft integration tests were performed at the hangar, while also verification measurements of the aircraft-integrated IPCT system versus micrometer were made. The ground-based verification demonstrated the inherently high accuracy of the method. The IPCT system was used successfully in-flight for wing deformation measurements. 5 g. Optical displacements of a randomly speckled part of the wing relative to a reference frame were determined using cross correlation techniques. These optical displacements were converted to geometrical wing deformations in a reference frame relative to the wing in reference condition.
This means that IPCT data cannot be used beyond this frequency except at the high excitation peak at 57 Hz. In summary, it can be stated that in laboratory pre-tests the IPCT has proven the feasibility for the use in vibration testing under transient excitation. A point to consider is that due to frequencies above the Nyquist rate, aliasing can occur and can lead to errors in the measured data. Thus, for the use of slow cameras, it is necessary to ensure that no structural responses with a high deformation are present.