【摘 要】
：
In this paper,a new analytical method for vibration analysis of a cracked simply supported beam is investigated.By considering a nonlinear model for the fatigue
【机 构】
：
Department of Mechanical Engineering
论文部分内容阅读
In this paper,a new analytical method for vibration analysis of a cracked simply supported beam is investigated.By considering a nonlinear model for the fatigue crack,the governing equation of motion of the cracked beam is solved using perturbation method.The solution of the governing equation reveals the superharmonics of the fundamental frequency due to the nonlinear effects in the dynamic response of the cracked beam.Furthermore,considering such a solution,an explicit expression is also derived for the system damping changes due to the changes in the crack parameters,geometric dimensions and mechanical properties of the cracked beam.The results show that an increase in the crack severity and approaching the crack location to the middle of the beam increase the system damping.In order to validate the results,changes in the fundamental frequency ratios against the fatigue crack severities are compared with those of experimental results available in the literature.Also,a comparison is made between the free response of the cracked beam with a given crack depth and location obtained by the proposed analytical solution and that of the numerical method.The results of the proposed method agree with the experimental and numerical results.
其他文献
文学作品的风格可不可译一直是文学翻译界争论的焦点。笔者站在支持文学作品风格可译的立场上,结合吴程远先生对《别闹了,费曼先生》一书风格的成功翻译分析翻译文学作品风格
Amorphous Ni-Ru-B/ZrO2 catalysts were prepared by chemical reduction method.The effects of Ni-Ru-B loading and Ru/Ni mole ratio on the catalytic performance for
With density functional theory(DFT) and molecular mechanics method, the catalytic mechanism of silent information regulator(sirtuins) has been investigated. The
In this article, we investigate Programming Evaluation and Review Technique networks with independently and generally distributed activity durations. For any pa
In the present study,the detailed reaction mechanisms were developed and Chemkin 4.1.1 was implemented to predict the formation of pollutant species in compress
The title compound has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction. The crystal is of orthorhombic system (C23
Structural and electronic properties of bimetallic clusters AlnCom with n = 1～7 and m = 1～2 have been investigated using the B3LYP-DFT method. Structural optimiza
Anthracite in Jincheng is a highly metamorphic coal and its system of fissures and pores is differentfrom that of low and medium ranked coal.In order to discove
多分蘖矮秆水稻‘tdr(t)’是在半矮秆籼稻品系‘E20’中发现的一份突变体.与野生型‘E20’相比,‘tdr(t)’主要表现为植株矮化,分蘖增多,育性降低,各节间所占株高比例与野生
语义内容和语用因素是语法的基础，语法是语义内容和语 用因素的程式化体现。基于这一理论模型，本文分析了英语名转动结构式生成过程中语义、 语用功能代谢的特征。作者发现英语