Testing of a Fiber-Optical Sensor System for Rotor Blade HUMS

Le résumé fourni par la source

As a prerequisite for the development of HUMS (Health and Usage Monitoring Systems) using blade displacement and sectional force estimation in forward flight, rotor blades are instrumented with fiber-optical sensors at the Institute for Helicopter Technologies and VTOL at the Technical University of Munich. Utilizing a total number of 60 directional strain measurements it is possible to reproduce the strain field of five sections along the uniform airfoil section. Knowing the exact location of the integrated sensors is crucial for shape reconstruction and may vary in reality due to a number of uncertainties occurring in chordwise and thickness direction of the airfoil profile during fabrication. Thermographic scan methods and computed tomography scans are investigated in order to determine the sensor locations inside the blade and to reproduce a 3D model of the integrated sensor system. Improvements can be seen when comparing results from static deformation tests using the sensor positioning from the layout and the real sensor positions investigated in computed tomography. In addition sectional stiffness terms are derived from strain measurements in combination with loadcell data. With the scope of state observation on the MERIT (Munich Experimental Rotor Investigation Testbed) test rig at the TU Munich a measurement environment is established using an optical data transmission to extract strain signals from the rotating system. First investigations show the potential of optical strain measurements in the rotating systems for a variety of applications.

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