Feature analysis of blade strain variation with crosswind angle
MA Jianlong1,2, LI Peilin1, LU Wenchun1,3, BAI Yefei1,2, ZHANG Yanqi1, WANG Jianwen1,2#br#
1．School of Energy and Power Engineering, Inner Mongolia University of Technology，Hohhot 010051，China；
2．Ministry of Education Key Laboratory of Wind Energy and Solar Energy Utilization Technology，Hohhot 010051，China；
3.Metallurgical and Material Engineering Department，Inner Mongolia Technical College of Mechanics and Electrics，Hohhot 010070，China
The simultaneous monitoring system of blade surface strains and vibration accelerations of a generator, its tower and base was constructed by using a TST5925 device and a PULSE19 device. The strain values at the blade root and the pneumatic centerline of a 1.4 m diameter horizontal axis wind turbine were measured and analyzed under crosswind conditions. The results showed that there is the worst crosswind angle, at this angle the blades withstand the strongest crosswind exciting force and the centrifugal force is the primary cause leading to blades shift; the worst crosswind angles corresponding to different blade positions are not the same under fixed wind speed and blade rotating speed; at lower rotating speeds, the worst crosswind angles near the blade root are often smaller than those at the tip and middle of the blade, but their responding speeds variations with the centrifugal force are more sensitive than those at other locations; strain value changings with blade rotating speed are approximately linear while for away from the worst crosswind angles, the impact of the crosswind exciting force on the blade strain significantly increases and causes a strong pulsation of strain values while close to the worst crosswind angles.
马剑龙1,2，李佩林1，吕文春3，白叶飞1,2，张彦奇1，汪建文1,2. 叶片应变随侧风角度变化的特征分析[J]. 振动与冲击, 2017, 36(1): 114-119.
MA Jianlong1,2, LI Peilin1, LU Wenchun1,3, BAI Yefei1,2, ZHANG Yanqi1, WANG Jianwen1,2. Feature analysis of blade strain variation with crosswind angle. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(1): 114-119.
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