线弹性范围内钢悬臂梁的阻尼特性试验研究

发布时间：2018-03-04 03:12

本文选题：阻尼比　切入点：悬臂梁　出处：《振动工程学报》2016年06期 　论文类型：期刊论文

【摘要】：采用材质相对均匀、结构较为简单的钢悬臂梁为试验对象,通过自由振动试验,研究了阻尼比的变化规律。设计制作了4根相同的矩形截面钢悬臂梁,根据国家标准规定的试验方法对材料力学性能进行了测试,得到了弹性模量和拉压强度。采用自由衰减法对钢悬臂梁进行不同初始振动幅度下的自由振动测试,识别不同振动幅度时悬臂梁的阻尼比。研究结构构件在自由振动下阻尼比的变化规律,分析线弹性范围内阻尼比与振动幅度的关系,得出以下结论:线弹性范围内,悬臂梁自由振动的阻尼比随其振动幅度的增加而增大,为结构在小幅度振动下的动力分析提供了参考依据。
[Abstract]:Four steel cantilever beams with the same rectangular section are designed and fabricated by using the steel cantilever beam with relatively uniform material and simple structure as the experimental object, and through the free vibration test, the variation of damping ratio is studied. According to the test method prescribed by the national standard, the mechanical properties of the material are tested, and the elastic modulus and tensile strength are obtained. The free vibration test of steel cantilever beam is carried out under different initial vibration amplitude by using the free attenuation method. The damping ratio of cantilever beam with different vibration amplitude is identified. The variation law of damping ratio of structural members under free vibration is studied, the relationship between damping ratio and vibration amplitude in linear elastic range is analyzed, and the following conclusions are obtained: in linear elastic range, The damping ratio of cantilever beam increases with the increase of vibration amplitude, which provides a reference for the dynamic analysis of the structure under small amplitude vibration.
【作者单位】：武汉理工大学土木工程与建筑学院;
【基金】：国家自然科学基金资助项目(51178365)
【分类号】：TU391

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