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Nonlinear transverse vibrations of a slightly curved beam carrying a concentrated mass 被引量:6
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作者 E.zkaya M.Sarigül H.Boyaci 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2009年第6期871-882,共12页
In this study, a slightly curved Euler Bernoulli beam carrying a concentrated mass was handled. The beam was resting on an elastic foundation and simply supported at both ends. Effects of the concentrated mass on nonl... In this study, a slightly curved Euler Bernoulli beam carrying a concentrated mass was handled. The beam was resting on an elastic foundation and simply supported at both ends. Effects of the concentrated mass on nonlin- ear vibrations were investigated. Sinusoidal and parabolic type functions were used as curvature functions. Equations of motion have cubic nonlinearities because of elongations during vibrations. Damping and harmonic excitation terms were added to the equations of motion. Method of mul- tiple scales, a perturbation technique, was used for solving integro-differential equation analytically. Natural frequen- cies were calculated exactly for different mass ratios, mass locations, curvature functions, and linear elastic foundation coefficients. Amplitude-phase modulation equations were found by considering primary resonance case. Effects of nonlinear terms on natural frequencies were calculated. Frequency-amplitude and frequency-response graphs were plotted. Finally effects of concentrated mass and chosen curvature function on nonlinear vibrations were investigated. 展开更多
关键词 Nonlinear vibrations . Slightly curved beamNonlinear elastic foundation. Concentrated mass
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Wavelet basis construction method based on separation blast vibration signal
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作者 凌同华 张胜 +1 位作者 陈倩倩 李洁 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2809-2815,共7页
As wavelet basis in wavelet analysis is neither arbitrary nor unique,the same signal dealing with different wavelet bases will generate different results.Therefore,how to construct a wavelet basis suitable for the cha... As wavelet basis in wavelet analysis is neither arbitrary nor unique,the same signal dealing with different wavelet bases will generate different results.Therefore,how to construct a wavelet basis suitable for the characteristics of the analyzed signal and solve its algorithm and realization is a fundamental problem which perplexed many researchers.To solve these problems,in accordance with the basic features of the measured millisecond blast vibration signal,a new wavelet basis construction method based on the separation blast vibration signal is proposed,and the feasibility of this method is verified by comparing the practical effect of the newly constructed wavelet with other known wavelets in signal processing. 展开更多
关键词 wavelet basis construction curve fitting millisecond blast vibration signal sub-signal
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Effect of laser shock peening on combined low- and high-cycle fatigue life of casting and forging turbine blades 被引量:4
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作者 Cao Chen Xiao-yong Zhang +3 位作者 Xiao-jun Yan Jun Ren Da-wei Huang Ming-jing Qi 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第1期108-119,共12页
Laser shock peening (LSP) is a novel effective surface treatment method to improve the fatigue performance of turbine blades. To study the effect of LSP on combined low- and high-cycle fatigue (CCF) life of turbin... Laser shock peening (LSP) is a novel effective surface treatment method to improve the fatigue performance of turbine blades. To study the effect of LSP on combined low- and high-cycle fatigue (CCF) life of turbine blades, the CCF tests were conducted at elevated temperatures on two types of full-scale turbine blades, which were made of K403 by casting and GH4133B by forging. Probabilistic analysis was conducted to find out the effect of LSP on fatigue life of those two kinds of blades. The results indicated that LSP extended the CCF life of both casting blades and forging blades obviously, and the effect of LSP on casting blades was more evident; besides, a threshold vibration stress existed for both casting blades and forging blades, and the CCF life tended to be extended by LSP only when the vibration stress was below the threshold vibra- tion stress. Further study of fractography was also conducted, indicating that due to the presence of compressive residual stress and refined grains induced by LSP, the crack initiation sources in LSP blades were obviously less, and the life of LSP blades was also longer; since the compressive residual stress was released by plastic deformation, LSP had no effect or adverse effect on CCF life of blade when the vibration stress of blade was above the threshold vibration stress. 展开更多
关键词 Laser shock peening Combined low-and high-cycle fatigue life (CCF) Full-scale turbine blade S-N curve -Threshold vibration stress
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