Experimental Study on Frequency-Domain Variation Characteristics for Dynamic Strain of a Propeller

Journal of Propulsion Technology ›› 2019, Vol. 40 ›› Issue (1): 223-231.

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Experimental Study on Frequency-Domain Variation Characteristics for Dynamic Strain of a Propeller

National Engineering Research Center of Dredging Technology and Equipment，Shanghai 201208，China;State Key Laboratory of Ocean Engineering，Collaboration Innovation Center for Advanced Ship and Deep-Sea Exploitation Equipment，Shanghai Jiaotong University，Shanghai 200240，China,National Engineering Research Center of Dredging Technology and Equipment，Shanghai 201208，China,State Key Laboratory of Ocean Engineering，Collaboration Innovation Center for Advanced Ship and Deep-Sea Exploitation Equipment，Shanghai Jiaotong University，Shanghai 200240，China,State Key Laboratory of Ocean Engineering，Collaboration Innovation Center for Advanced Ship and Deep-Sea Exploitation Equipment，Shanghai Jiaotong University，Shanghai 200240，China,State Key Laboratory of Ocean Engineering，Collaboration Innovation Center for Advanced Ship and Deep-Sea Exploitation Equipment，Shanghai Jiaotong University，Shanghai 200240，China and National Engineering Research Center of Dredging Technology and Equipment，Shanghai 201208，China

Published:2021-08-15

外部轴向激励作用下螺旋桨桨叶动应变频域变化特性试验研究

舒敏骅^1,2,尹纪富¹,陈科²,尤云祥²,胡天群²,洪国军¹

疏浚技术装备国家工程研究中心，上海 201208;上海交通大学海洋工程国家重点实验室 /高新船舶与深海开发装备协同创新中心，上海 200240,疏浚技术装备国家工程研究中心，上海 201208,上海交通大学海洋工程国家重点实验室 /高新船舶与深海开发装备协同创新中心，上海 200240,上海交通大学海洋工程国家重点实验室 /高新船舶与深海开发装备协同创新中心，上海 200240,上海交通大学海洋工程国家重点实验室 /高新船舶与深海开发装备协同创新中心，上海 200240,疏浚技术装备国家工程研究中心，上海 201208

基金资助:
国家重点研发计划课题( 2016YFC0402107)。

Abstract

Abstract: In order to investigate the effects of the external axial-excitation on the frequency-domain char.acteristics of dynamic strain of propeller blades，the strain gauge and special underwater data acquisition instru.ment are employed while the frequency-domain variation characteristics of dynamic strain are experimentallystudied on 7-blades high-skewed propeller. The results show that the frequency-domain characteristics of dy.namic strain of propeller blades can clearly reflect the coupling vibration characteristics of the main frequency fea.ture of non-uniform flow field and propeller shaft frequency under the condition of non-uniform inflow. At threedifferent radial positions of the propeller blades，the frequency-domain variation characteristics of dynamic straincan all reflect the shaft frequency and its harmonic frequency feature of the propeller. Among them，the dynamic strain characteristics at 0.6 times propeller radius position are the most obvious，followed by 0.8 times propeller radius position，and the change at 0.4 times propeller radius position is the smallest. When two external axial-ex. citations with excitation frequency fe=42Hz and fe=60Hz act on the propeller-shaft respectively，the propeller blades all will generate a frequency response to it in the frequency-domain of dynamic strain，and its response frequency is always consistent with the excitation frequency.

Key words: External axial-excitation；7-blades high-skewed propeller；Dynamic strain；Laser doppler velocimetry(LDV)； Strain gauge

摘要： 为了研究外部轴向激励作用对螺旋桨桨叶动应变频域特性的影响，采用应变片和特制的水下数据采集仪对七叶大侧斜螺旋桨桨叶动应变的频域变化特性进行了试验测量研究。试验结果显示，在非均匀来流条件下，螺旋桨桨叶动应变的频域特性能明显反映出非均匀流场的主角频特征与螺旋桨轴频的耦合振动特性。在螺旋桨桨叶的三个不同径向位置处，桨叶的动应变频域变化特性均能够反映出螺旋桨的轴频及其谐频特征。其中， 0.6倍螺旋桨半径位置处的动应变特性最为明显， 0.8倍螺旋桨半径位置处次之， 0.4倍螺旋桨半径位置处的变化最小；当激励频率 fe=42Hz和 fe=60Hz的两个外部轴向激励分别作用于螺旋桨 -轴系时，螺旋桨桨叶动应变频域均会对其产生一个频率响应，其响应频率与激励频率始终保持一致。

关键词: 外部轴向激励；七叶大侧斜螺旋桨；动应变；激光多普勒测速仪；应变片

SHU Min-hua^1,2,YIN Ji-fu¹,CHEN Ke²,YOU Yun-xiang²,HU Tian-qun²,HONG Guo-jun¹. Experimental Study on Frequency-Domain Variation Characteristics for Dynamic Strain of a Propeller[J]. Journal of Propulsion Technology, 2019, 40(1): 223-231.

舒敏骅,尹纪富,陈科,尤云祥,胡天群,洪国军. 外部轴向激励作用下螺旋桨桨叶动应变频域变化特性试验研究[J]. 推进技术, 2019, 40(1): 223-231.

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Experimental Study on Frequency-Domain Variation Characteristics for Dynamic Strain of a Propeller

外部轴向激励作用下螺旋桨桨叶动应变频域变化特性试验研究

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