Abstract
The work presents data treatment methods aimed at eliminating the noise in the strain sensor data induced by vibrations of the helicopter blade in flight conditions. The methods can be applied in order to enhance the metrological performance of the helicopter weight estimation system based on the deformation measurement of the main rotor blades. The experimental setup included a composite plate fixed to the vibrating stand on the one end, with six fiber-optic strain sensors attached to its surface. In this work, the procedure of the optimal linear smoothing (POLS) and 3D-invariant methods were used to obtain monotone calibration curves for each detector, thereby making it possible to distinguish the increase of load applied to the free end of the plate with an increment of 10 g. The second method associated with 3D invariants took into account 13 quantitative parameters defined as the combination of different moments and their intercorrelations up to the fourth-order inclusive. These 13 parameters allowed the calculation of the 3D surface that can serve as a specific fingerprint, differentiating one set of initial data from another one. The combination of the two data treatment methods used in this work can be applied successfully in a wide variety of applications.
Highlights
Helicopter main rotor blades are essential components that define the flight performance and safety of the helicopter
The existing approaches to helicopter blade deformation measurement can be divided into four main categories: the systems based on the detection of reflected light [2,3,4], the systems based on laser units [5], the systems based on electrical resistance strain gauges [6,7,8], and the fiber-optic strain measurement systems [9,10,11]
The work [4] presents an approach to blade deformation monitoring based on the digital image correlation (DIC) technique, in which the surface of the blade is painted with a high-contrast random dot pattern
Summary
Helicopter main rotor blades are essential components that define the flight performance and safety of the helicopter. Monitoring of their state is of the utmost importance during helicopter exploitation. In order to perform the abovementioned tasks, real-time blade deformation measurements are required, which enable the blade wear or damage detection during helicopter operation as well as the evaluation of blade displacements during development testing procedures. The work [4] presents an approach to blade deformation monitoring based on the digital image correlation (DIC) technique, in which the surface of the blade is painted with a high-contrast random dot pattern. The performance of such systems depends on the conditions of the ambient environment, such as weather conditions, altitude, time of day, disturbances from external light sources
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