Composite propeller's strain modal and structural vibration performance
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摘要: 采用有限元模态算法和应变模态测量试验对比金属桨和碳纤维桨模型的固有频率、位移和应变模态振型,试验测得铜桨和碳纤维桨的前三阶固有频率与计算值相差分别在3%和12%以内。碳纤维桨各阶固有频率均比铜桨要小,应变模态振型相似,前者结构阻尼是后者的4倍左右。计算二者在流域中的湿模态,铜桨的前四阶湿模态固有频率比干模态减小18%~33%,碳纤维桨减小54%~64%。研究铜桨和不同铺层碳纤维桨之间的振动特性,得出有利于减轻振动的纤维铺层方式,优选出的碳纤维桨总振动加速度级(TAL)比试验用碳纤维桨降低2 dB。Abstract: The natural frequency and displacement strain modal's vibration mode is comparative studied using validated finite modal algorithm and strain modal experiment, the result showed that the deviation of tested and calculated first three natural frequency of copper and carbon fiber propeller is within 3% and 12%.The carbon fiber propeller has smaller natural frequency, similar strain modal and four times structure damping compared with copper propeller.Further calculation of the wet modal of two propellers, the first four wet modal natural frequency of copper propeller reduced 18%~33% compared with the corresponding dry modal, while the carbon fiber propeller's reduction is 54%~64%.More research on vibration performance of propeller is carried out, the fiber orientation beneficial for vibration attenuation is obtained, the total acceleration level of optimized carbon fiber propeller is 2 dB less than the tested carbon fiber propeller.
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Keywords:
- composite propeller /
- strain modal /
- natural frequency /
- vibration response /
- acceleration level
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