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The influence of elastic boundary on modal parameters of thin cylindrical shell
Li H(李晖)1; Luo HT(骆海涛)2; Sun W(孙伟)1; Wen BC(闻邦椿)1
Department空间自动化技术研究室
Source PublicationInternational Journal of Acoustics and Vibrations
ISSN1027-5851
2018
Volume23Issue:1Pages:93-105
Indexed BySCI ; EI
EI Accession number20181705045168
WOS IDWOS:000435809200013
Contribution Rank2
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China ; Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University
Abstract

This research combines theory with experiment to investigate the influence of an elastic boundary on modal parameters of a thin cylindrical shell (TCS). First, artificial stiffness method and finite element method (FEM) are employed to calculate natural frequencies and modal shapes of TCS under condition such that vibration characteristics of elastically supported shell can be roughly mastered. Then, the following measurements and identification techniques are used to get precise frequency, damping, and shape results: non-contact laser Doppler vibrometer and vibration shaker with excitation level being precisely controlled are used in the test system; “pre-experiment” is adopted to determine the required tightening torque as well as to verify whether or not the tested shell is under constraint boundary; and 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 accurate measured data, the influences on natural frequencies, modal shapes, and damping ratios of TCS under elastic boundary are analysed and discussed. It can be found that an elastic boundary can significantly affect frequency and damping results, clearly reducing high order damping and decreasing natural frequencies of most modes. However, high order natural frequencies and mode shapes are still the same as the ones under the constraint condition, and the changing trend of natural frequencies with mode shapes is constant when the order of axial mode is m = 1, which agrees well with the results calculated by artificial stiffness method and FEM.

Language英语
WOS SubjectAcoustics ; Engineering, Mechanical ; Mechanics
WOS KeywordFREE-VIBRATIONS
WOS Research AreaAcoustics ; Engineering ; Mechanics
Funding ProjectNational Natural Science Foundation of China[51505070] ; Fundamental Research Funds for the Central Universities of China[N150304011] ; Fundamental Research Funds for the Central Universities of China[N160313002] ; Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University[VCAME201603]
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sia.cn/handle/173321/21872
Collection空间自动化技术研究室
Corresponding AuthorLi H(李晖)
Affiliation1.School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China;
2.State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences (CAS), Shenyang 110016, China
Recommended Citation
GB/T 7714
Li H,Luo HT,Sun W,et al. The influence of elastic boundary on modal parameters of thin cylindrical shell[J]. International Journal of Acoustics and Vibrations,2018,23(1):93-105.
APA Li H,Luo HT,Sun W,&Wen BC.(2018).The influence of elastic boundary on modal parameters of thin cylindrical shell.International Journal of Acoustics and Vibrations,23(1),93-105.
MLA Li H,et al."The influence of elastic boundary on modal parameters of thin cylindrical shell".International Journal of Acoustics and Vibrations 23.1(2018):93-105.
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