Fig. 15.6), specific values of the anisotropic GF-based noncrimp reinforced composite material (Young's modulus and strength), deductive load hypothesis as well as the measured deflection at the three points S 01 to S 03.įor small wind turbine systems with multi-purposes such as quiet running, safety, and simple installation, the rotor blade consisting of NACA2404 airfoil with fan wing configuration, 500 mm rotor diameter and 18° pitch angle of rotor was developed. The calculation is based on the CAD shell model of the realized wind turbine blade taking into consideration the following: laminate sequence (cf. For this purpose, the nonlinear finite element modelling program LS-DYNA ® (LSTC Livermore Software Technology Corp.) is used following the approach of Stelzmann et al. In order to compare the obtained measurement values of the in situ CFY sensors and therefore their suitability for spatially resolved in situ strain measurement, the accumulated strain along the blade's longitudinal ( z) axis and its displacement are calculated on a ply-based composite model. The nominal bending of the blade is captured by inductive displacement transducers (W1T3 and WTA series, coupled with MGC bridge amplifier with the MC50 inductive bridge input measuring board, Hottinger Baldwin Messtechnik HBM GmbH) at three measurement points (S 01 at 600 mm, S 02 at 1400 mm and S 03 at 2410 mm) as shown in Fig. Resistance of CFY sensor in upper blade semi-shell (suction side) (Ω) Resistance of CFY sensor in lower blade semi-shell (pressure side) (Ω) All signals, the measured deflection of the blade's bending line and the change in resistance of the integrated CFY sensors, are continuously sampled at 1.0 kHz frequency using NI SignalExpress ® (National Instruments Corp.). Their bridge detuning is measured with an eight-channel resistive bridge input measurement board PXIe 4331 (National Instruments Germany GmbH). During performance of quasi-static load tests, three CFY sensors pairs (bridge channels Ch 01, Ch 02, Ch 03) are used to measure the accumulated bending strain along their integration lengths (cf. In addition to thermal drift compensation, this allows an appropriate amplification of the bridge detuning (change in resistance) indicating the superposed mechanical bending strain. The measurement setup of bending test rig is shown in Fig. Thereby, sensors with similar length in each shell are interconnected to adjoined bridge sections of Wheatstone half-bridges. The bending strain is measured with integrated CFY strain sensors within the reinforcement of the blade's semi-shells located below and above the neutral axis, respectively.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
January 2023
Categories |