The Influence on Modal Parameters of Thin Cylindrical Shell under Bolt Looseness Boundary
The Influence on Modal Parameters of Thin Cylindrical Shell under Bolt Looseness Boundary
复制标题
螺栓松动边界对薄圆柱壳模态参数的影响
DOI：
10.1155/2016/4709257
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发表时间：
2016-01
影响因子：
1.6
通讯作者：
Bangchun Wen
中科院分区：
文献类型：
--
作者：
Hui Li;Mingwei Zhu;Zhuo Xu;Zhuo Wang;Bangchun Wen
研究了螺栓松动边界条件对圆柱薄壳模态参数的影响。首先，将壳体螺栓松动边界划分为不同螺栓松动数和不同螺栓松动程度两种情况，采用有限元方法计算了其固有频率和振型，初步掌握了该情况下TCS的振动特性。然后，采用非接触式激光多普勒测振仪和激振级精确控制的振动台作为测试系统，通过“预实验”确定所需的拧紧力矩，验证固定约束边界，并对试验结果进行分析，得到精确的频率、阻尼和形状等参数。采用小段FFT处理技术精确测量固有频率，采用激光旋转扫描技术高效率地获得形状结果。最后，基于上述技术获得的测试结果，分析和讨论了两种螺栓松动边界条件对牵引力控制系统模态参数的影响。结果表明，螺栓松动边界对结构的频率和阻尼有显著的影响，这可能是由于非线性刚度和阻尼以及螺栓松动位置的变化引起的。
The influence on modal parameters of thin cylindrical shell (TCS) under bolt looseness boundary is investigated. Firstly, bolt looseness boundary of the shell is divided into two types, that is, different bolt looseness numbers and different bolt looseness levels, and natural frequencies and mode shapes are calculated by finite element method to roughly master vibration characteristics of TCS under these conditions. Then, the following measurements and identification techniques are used to get precise frequency, damping, and shape results; for example, noncontact laser Doppler vibrometer and vibration shaker with excitation level being precisely controlled are used in the test system; “preexperiment” is adopted to determine the required tightening torque and verify fixed constraint boundary; the small-segment FFT processing technique is employed to accurately measure nature frequency and laser rotating scanning technique is used to get shape results with high efficiency. Finally, based on the measured results obtained by the above techniques, the influence on modal parameters of TCS under two types of bolt looseness boundaries is analyzed and discussed. It can be found that bolt looseness boundary can significantly affect frequency and damping results which might be caused by changes of nonlinear stiffness and damping and in bolt looseness positions.
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影响因子：
1.6
作者：
C. Loy;K. Lam;C. Shu
通讯作者：
C. Loy;K. Lam;C. Shu
DOI：
10.4028/www.scientific.net/kem.306-308.547
发表时间：
2006-01
期刊：
Key Engineering Materials
影响因子：
--
作者：
Young-Doo Kwon;Hyun-Wook Kwon;Ji-Hoon Hwangbo;S. Jang
通讯作者：
Young-Doo Kwon;Hyun-Wook Kwon;Ji-Hoon Hwangbo;S. Jang
影响因子：
4.7
作者：
Shupeng Sun;S. Chu;D. Cao
通讯作者：
Shupeng Sun;S. Chu;D. Cao
DOI：
10.1007/978-1-84628-814-2_102
发表时间：
2006-12
期刊：
Key Engineering Materials
影响因子：
--
作者：
G. Dong;Jin Chen;Nong Zhang
通讯作者：
G. Dong;Jin Chen;Nong Zhang
DOI：
--
发表时间：
2012
期刊：
Key Engineering Materials
影响因子：
--
作者：
Li Peng
通讯作者：
Li Peng