Data acquisition system in LSU-02 ng LD wing static test based on whiffletree

Abstract

Full wing configuration of LSU-02 NG LD main wing was tested statically based on whiffletree method. This test was conducted using 12 tensile point loads which are located precisely on the wing ribs. Three load cells are used to measure force; one for measure the total amount of aerodynamic lift load, and two others for measure the aerodynamic lift load on the left and the right wing respectively. Two strain gauges are glued to the aluminum spar in the inner wing, and one displacement transducer is installed on the left-wing tip to measure wing deflection. NI 9237 module is used to read load cell data and displacement transducer, and NI 9235 module is used to read strain rate data. Experiment result shows that wing structure fails at load factor 1.7 (306 N) with maximum wing tip deflection recorded at 120 mm. Structural failure occur in the middle of the inner wing, which is become valuable input for the design team to take necessary measure to prevent similar structural failure.