Effect of Blocking Mass on Characteristics of Beam Lateral Vibration
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摘要: 将附加阻振质量块的主泵简化为质量块-梁模型,引入表征质量块安装位置、质量块与梁质量之比的无量纲因子。建立2个局部坐标系,利用理论方法分段建立模型的横向振动方程,并推导特征方程。数值计算了系统振动频率,讨论质量比变化及质量块的安放位置变化对质量块-梁系统振动频率的影响。讨论与主泵安装工况近似的悬臂边界时,调节质量块安装位置与质量比对系统频率的影响,最后给出系统的振动模态。计算结果表明,随着质量比增加,系统各阶频率降低,但随安装位置变化而波动,且基频以上各阶存在若干频率不变的安装位置;增加质量比对系统振动特性的影响可通过调节质量块安装位置得到降低。Abstract: The lateral vibration equation is established by setting up two separate co-coordinate systems of the mass-beam system,and the non-dimensional coefficients implying the position and mass radio of the mass in the system are presented in the paper.The effect on the vibration frequencies of changing the position and the mass radio in the system is numerically discussed,and the modes of the system with different mass radio and position are considered.The result shows that the frequencies decrease as increasing the mass radio,but the frequencies fluctuate with position changing,and there exists some positions that the frequencies do not vary after the mass radio increases except the first frequency,also that the effects on the vibration characteristic as increasing the mass radio can be decreased by modulating the position of the mass.
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Key words:
- Mass-beam system /
- Mass radio /
- Position changing /
- Nature frequency
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