摘要
对于舰船推进轴系的螺旋桨激励,由于其工作环境和结构条件的限制,很难在实际工况下进行直接测量。通过测量轴系的振动响应对螺旋桨激励进行估计是一种可行的方法。本文根据激励反演理论,从推进轴系的一般结构形式出发,提出了适用于由轴系振动响应估计螺旋桨激励的理论模型。由等截面均匀轴入手,通过轴段的波动解来分析纵向振动;结合边界条件,推导了波幅系数递推关系,进而建立了推进轴系纵向振动的一般波导模型。根据振动响应和建立的波导模型来识别波幅系数,并反演螺旋桨纵向激励。将模态法与波导法相结合,对一般的变截面非均质轴段的波导模型和轴段间波导传递关系进行了论证。结果表明,模态法与波导法结合,可作为一般方法,根据实测振动响应对复杂轴系结构的波导模型进行识别。
The propeller excitation of the ship propulsion shafting is difficult to perform direct measurement under actual working conditions due to the limitation of its working environment and structural conditions.It is a feasiblemethod to estimate the propeller excitation by measuring the vibration response of the shafting.Based on the theory of excitation inversion,a theoretical model suitable for estimating the propeller excitation from the vibration response of the shafting from the general structural form of the propulsion shafting,is proposed.Starting from the uniform axis of equal section,the longitudinal vibration is analyzed by the wave solution of the shaft section.Combined with the boundary conditions,the recursive relationship of the amplitude coefficient is derived,and then the general waveguide model of the longitudinal vibration of the propulsion shaft is established.The amplitude coefficient is identified based on the vibration response and the established waveguide model,and the longitudinal excitation of the propeller is inverted.Through the combination of the modal method and the waveguide method,the waveguide model of the general variable section non-homogeneous axial section and the waveguide transmission relationship between the shaft segments are demonstrated.The results show that the modal method combined with the waveguide method can be used as a general method to identify the waveguide model of complex shafting structure based on the measured vibration response.
作者
孙渊博
霍睿
张磊
Sun Yuanbo;Huo Rui;Zhang Lei(School of Mechanical Engineering,Shandong University,250061,Jinan,China;Key Laboratory of EtTicient Clean and Mechanistic Manufacturing of Ministry of Education,Shandong University,250061,Jinan,China;National Experimental Teaching Demonstration Center of Mechanical Engineering,Shandong University,250061,Jinan,China;Jinan Cigarette Factory,Shandong Zhongyan Industry Co.,Ltd.,250104,Jinan,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2020年第6期2520-2526,I0014,I0015,共9页
Chinese Journal of Applied Mechanics
基金
国防预研项目资助。
关键词
推进轴系
激励
响应
模态法
波导法
propulsion shafting
excitation
response
modal method
waveguide method
