多点复杂载荷激励作用下舰船等结构的振动响应问题是进行声辐射问题求解的前提。以安装于基座面板上的激振电机作为激振源，振源与基座面板通过力传感器进行多点连接，分别使用力传感器和加速度计测量激振电机运转时输入至结构的激振力和安装点处的加速度值。采用MATLAB和LabVIEW两种编程语言混合编程，考虑相位差的影响，结合有限元法获取的传递函数，对多点激励下的振动响应进行仿真和试验研究。并探讨了结构在力型输入和加速度型输入条件下，多点激振的振动响应求解方法，试验研究的结果验证了多点激振时传递函数理论计算结果的正确性。对比研究结果表明采用力型输入所得结果与实验结果符合最好，且影响加速度型作为输入条件求解振动响应精度的因素多，并非参与运算的通道越多所得结果越好。
Abstract
Warships’ sound radiations under multi-point complex loads are based on their structures’ vibration responses. Here, an exciting motor was installed on a warship’s base plate as a vibration excitation source. This vibration source was connected with the base plate at multiple points through force sensors. Force sensors and accelerometers were used to measure exciting forces inputted from the motor to the warship’s structure and accelerations at installation points, respectively. A program coded with MATLAB and LabVIEW was developed to calculate the warship’s structure vibration responses under multi-point complex excitations considering effects of phase differences among inputs and combining with the vibration transfer function obtained using the FE method. On the other hand, the multi-point excitations and the warship structure vibration responses were also measured in tests. Furthermore, the theoretical solving methods for structure’s vibration responses under multi-point excitations were explored in cases of force type of excitations and acceleration type ones, respectively. The test results verified the correctness of the theoretical calculation ones using the vibration transfer function. It was shown that the theoretical calculation results with force type of excitations agree best with those of tests; factors affecting the accuracy of solving vibration responses under acceleration type of excitations are many, more channels involved in computation do not always cause better results.
关键词
振动 /
多点复杂载荷 /
相位差 /
力输入 /
加速度输入 /
试验研究
{{custom_keyword}} /
Key words
vibration /
multi-point complex loads /
phase difference /
force input /
acceleration input /
tests
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 纪刚, 张纬康, 周其斗. 随机力作用下的水下结构声辐射分析[J]. 船舶力学，2006，10(2)：153-159．
JI Gang, ZHANG Wei-kang, ZHOU Qi-dou. Stochastic analysis on radiation from a randomly excited underwater structure [J]. Journal of Ship Mechanics, 2006，10(2)：153-159．.
[2] Allen M J, Vlahopoulos N. Integration of finite element and boundary element methods for calculating the radiated sound from a randomly excited structure[J]. Computers and Structures，2000，77: 155-169．
[3] Allen M J, Vlahopoulos N. Noise generated from a flexible and elastically supported structure subject to turbulent boundary layer flow excitation[J]. Finite Elements in Analysis and Design，2001，37: 687-712．
[4] Allen M J, Sbragio R, Vlahopoulos N. Structural/Acoustic Sensitivity Analysis of a Structure Subjected to Stochastic Excitation[J]. AIAA JOURNAL，2001，39(7)：1270-1279．
[5] Tao J S, Liu G R, Lam K Y. Sound radiation of a thin infinite plate in light and heavy fluids subject to multi-point excitation[J]. Applied Acoustics，2001，62：573-587.
[6] Burroughs C B. Acoustic radiation from fluid-loaded infinite circular cylinders with doubly periodic ring supports[J]. J. Acoust. Soc. Am.，1984，75(3)：715-722．
[7] Burroughs C B, Hallander J E. Acoustic radiation from fluid-loaded ribbed cylindrical shells excited by different types of concentrated mechanical drives[J]. J. Acoust. Soc. Am.，1992，91(5)：2721-2739.
[8] 陈明，王斌，曹为午. 水下复杂壳体结构在多源激励下的振动及声辐射特性研究[J]. 声学学报，2009，34(6)：498-505．
CHEN Ming, Wang Bin, CAO Wei-wu. Research on vibration and acoustic radiation of the submerged complicated shell structure with multiple excitations [J]. ACTA ACUSTICA, 2009，34(6)：498-505．
[9] 王雪仁，缪旭弘，贾地，等. 多源激励作用下结构振动响应的试验研究[J]. 振动与冲击，2011，30(3)：246-251．
WANG Xue-ren, MIAO Xu-hong, JIA Di, et al. Experimental study on structural vibration response induced by multi-excitations [J]. Journal of Vibration and Shock, 2011，30(3)：246-251．
[10] 刘涛. 水中复杂壳体的声-振特性研究[D]. 上海：上海交通大学，2002.
Liu Tao. Research on sound and vibration characteristics of complex cylindrical shell submerged in water [D]. Shanghai: Shanghai Jiao Tong University，2002.
[11] 叶文荣，张 恒，缪旭弘，等. 多点激励力下圆柱壳振动响应优化设计[J]. 噪声与振动控制，2013，2：36-39．
YE Wen-rong, ZHANG Heng, MIAO Xu-hong, et al. Design of Cylindrical Shell for Dynamic Performance Optimization under Multi-excitations [J]. Noise and Vibration Control, 2013，2：36-39．
[12] 周军伟，何琳，徐荣武，等. 响应传导函数在船舶机械噪声预报中的应用及实验验证[J]. 振动与冲击，2014，33(22)：78-82．
ZHOU Jun-wei, HE Lin, XU Rong-wu, et al. Practical application and experimental verification of transmissibility function [J]. Journal of Vibration and Shock, 2014，33(22)：78-82．
[13] 谢志勇. 复杂载荷作用下结构振动与噪声辐射理论及其试验研究[D] . 武汉：海军工程大学，2012.
Xie Zhi-yong. Research on theory and experiment of structural vibration and sound radiation under multipoint complex excitations [D]. Wuhan: Naval University of Engineering，2012.
[14] 王宇，张力，洪宝林，等. 正弦力校准中降低质量块振动响应不均匀影响的设计方案[J]. 振动与冲击，2010，29(7)：228-231．
WANG Yu, ZHANG Li, HONG Bao-lin, et al. Mass design plan in sinusoidal force calibration to avoid nonuniform vibration response [J].Journal of Vibration and Shock, 2010，29(7)：228-231．
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(2169 KB)
