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| Received:January 10, 2015 Revised:April 16, 2015 |
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| DOI：10.7511/jslx201602011 |
| KeyWord:cracked beam nonlinear coupling vibration simplified dynamic model impact |
| Author | Institution |
| 陈岩 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 王平 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 余飞 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 毛鹏程 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 关振群 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| The influence of cracks on the dynamic behavior of the beam is studied to provide a theoretical basis for crack monitoring.Firstly,the cracked zone is analyzed by establishing a 2D contact nonlinear finite element model,and its different compressive and tensile stiffness in static characteristics is clarified.Secondly,through the analysis of the mechanism model,it points out that different compressive and tensile stiffness will cause coupling vibration in axial and bending directions.Then,the coupling vibration phenomena is observed when using nonlinear dynamic analysis methods to study its dynamic characteristics.Moreover,it has an important feature that there is twice frequency component of bending vibration in axial vibration spectrogram.Finally,a new simplified dynamic model is established,and its rationality is verified compared with refined finite element analysis.This model converts the contact nonlinear problem to the material nonlinear problem to avoid complex solving process. |
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