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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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。
In order to investigate the effects of the external axial-excitation on the frequency-domain characteristics of dynamic strain of propeller blades,the strain gauge and special underwater data acquisition instrument are employed while the frequency-domain variation characteristics of dynamic strain are experimentally studied on 7-blades high-skewed propeller.The results show that the frequency-domain characteristics of dynamic strain of propeller blades can clearly reflect the coupling vibration characteristics of the main frequency feature of non-uniform flow field and propeller shaft frequency under the condition of non-uniform inflow.At three different radial positions of the propeller blades,the frequency-domain variation characteristics of dynamic strain can 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-excitations with excitation frequency fe=42 Hz and fe=60 Hz 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.
In order to investigate the effects of the external axial-excitation on the frequency-domain characteristics of dynamic strain of propeller blades,the strain gauge and special underwater data acquisition instrument are employed while the frequency-domain variation characteristics of dynamic strain are experimentally studied on 7-blades high-skewed propeller.The results show that the frequency-domain characteristics of dynamic strain of propeller blades can clearly reflect the coupling vibration characteristics of the main frequency feature of non-uniform flow field and propeller shaft frequency under the condition of non-uniform inflow.At three different radial positions of the propeller blades,the frequency-domain variation characteristics of dynamic strain can 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-excitations with excitation frequency fe=42 Hz and fe=60 Hz 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.
引文
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[13]Javdani S,Fabian M,Carlton J S,et al.Underwater Free-Vibration Analysis of Full-Scale Marine Propeller Using a Fiber Bragg Grating-Based Sensor System[J].IEEE Sensors Journal,2016,16(4):946-953.
[14]Wereldsma R.Stress Measurements on a Propeller Blade of a 42000 Ton Tanker on Full Scale[J].International Shipbuilding Progress,1964,11(113):3-16.
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[16]Swithenbank S B,Jessup S,Etebari A.Measurement of Crashback Loads on a Blade of Propeller 4381 in an Open and Ducted Configuration in the 36-Inch Water Tunnel[R].NSWCCD-50-TR-2008/061,2008.
[17]洪水棕,钱晓南,武卫,等.变螺距螺旋桨的实验应力分析[J].福州大学学报,1994,22(4):203-206.
[18]杨向晖,程尔升.大侧斜螺旋桨桨叶应力测试研究[J].船海工程,2004,(1):6-9.
[19]Tian J,Croaker P,Zhang Z Y,et al.Dynamic Strain Measurements of Marine Propellers under Non-Uniform Inflow[J].Journal of Physics:Conference Series,2016,744(1):1-8.
[20]Tian J,Croaker P,Li J S,et al.Experimental and Numerical Studies on the Flow-Induced Vibration of Propeller Blades under Nonuniform Inflow[J].Proceedings of the Institution of Mechanical Engineers,Part M:Journal of Engineering for the Maritime Environment,2017,231(2):481-495.
[2]Seol H,Suh J C,Lee S.Development of Hybrid Method for the Prediction of Underwater Propeller Noise[J].Journal of Sound and Vibration,2005,288(1-2):345-360.
[3]Seol H,Jung B,Suh J C,et al.Prediction of Non-Cavitating Underwater Propeller Noise[J].Journal of Sound and Vibration,2002,257(1):131-156.
[4]Lee S K,Liao M,Wang S Q.Propeller-Induced Hull Vibration-Analytical Methods[C].London:Proceedings of the 2nd International Ship Noise and Vibration Conference,2006.
[5]Jui F K.Analysis of Propeller Blade Stresses[D].Michigan:The University of Michigan,1984.
[6]舒敏骅,陈科,尤云祥,等.外部轴向激励作用下螺旋桨轴承力非定常变化特性数值研究[J].推进技术,2017,38(4):721-731.(SHU Min-hua,CHENKe,YOU Yun-xiang,et al.Numerical Study on Unsteady Variation Characteristics for Bearing Forces of a Propeller with External Axial-Excitation[J].Journal of Propulsion Technology,2017,38(4):721-731.)
[7]李坚波,王永生,孙存楼.大侧斜螺旋桨桨叶应力分析[J].中国造船,2009,50(4):1-6.
[8]覃昉,李兵,吴文辉.大侧斜对转螺旋桨水动力及桨叶应力数值计算[J].舰船科学技术,2013,35(6):11-14.
[9]孙海涛,熊鹰.考虑变形的螺旋桨水动力及变形特性研究[J].哈尔滨工程大学学报,2013,34(9):1108-1112.
[10]Ghassemi H,Fadavie M,Nematy D.Hydro-Structure Analysis of Composite Marine Propeller under Pressure Hydrodynamic Loading[J].American Journal of Mechanical Engineering,2015,3(2):41-46.
[11]Sontvedt T.Propeller Blade Stresses,Application of Finite Element Methods[J].Computers&Structures,1974,4(1).
[12]Carlton J,Grattan K T V,Ams M,et al.Fiber Bragg Grating-Based System for 2D Analysis of Vibrational Modes of a Steel Propeller Blade[J].Journal of Lightwave Technology,2014,32(23).
[13]Javdani S,Fabian M,Carlton J S,et al.Underwater Free-Vibration Analysis of Full-Scale Marine Propeller Using a Fiber Bragg Grating-Based Sensor System[J].IEEE Sensors Journal,2016,16(4):946-953.
[14]Wereldsma R.Stress Measurements on a Propeller Blade of a 42000 Ton Tanker on Full Scale[J].International Shipbuilding Progress,1964,11(113):3-16.
[15]Wereldsma R.Model Tests on the Fundamentals of Marine Propeller Stresses[M].Culemborg:Technical Publishing Co,1970.
[16]Swithenbank S B,Jessup S,Etebari A.Measurement of Crashback Loads on a Blade of Propeller 4381 in an Open and Ducted Configuration in the 36-Inch Water Tunnel[R].NSWCCD-50-TR-2008/061,2008.
[17]洪水棕,钱晓南,武卫,等.变螺距螺旋桨的实验应力分析[J].福州大学学报,1994,22(4):203-206.
[18]杨向晖,程尔升.大侧斜螺旋桨桨叶应力测试研究[J].船海工程,2004,(1):6-9.
[19]Tian J,Croaker P,Zhang Z Y,et al.Dynamic Strain Measurements of Marine Propellers under Non-Uniform Inflow[J].Journal of Physics:Conference Series,2016,744(1):1-8.
[20]Tian J,Croaker P,Li J S,et al.Experimental and Numerical Studies on the Flow-Induced Vibration of Propeller Blades under Nonuniform Inflow[J].Proceedings of the Institution of Mechanical Engineers,Part M:Journal of Engineering for the Maritime Environment,2017,231(2):481-495.