碰撞阻尼器中颤振发生条件研究

Research on Chattering Occurrence Condition in Impact Damper

以经典的碰撞阻尼器为基础,建立了非固定约束碰撞振动系统的动力学模型,通过数值模拟对非固定约束碰撞振动系统在低频区间的颤振发生条件进行了研究。结果表明频率比与间隙两个因素明显影响系统颤振行为的发生:(1)在低频率比区间容易发生颤振。随着频率比的减小,主系统与自由质量的单边连续碰撞次数由一次碰撞逐渐增加至多次碰撞,并且在低频率比条件下出现了粘滞行为。(2)小间隙容易发生颤振。随着间隙取值的增大,系统发生颤振的频率比区间随之缩小;若间隙取值超过某一临界值,系统将不会发生颤振行为。

This paperestablishes the dynamic model of the Vibro-impact system with non fixed constrainton the base of classical impact damper,and study the chattering occurrence condition in the low frequency rangeby numerical simulation.The results show the frequency ratio and clearance obviouslyaffect the system’s chatter behavior:(1)Chattering is prone to occur in the low frequency range.As the frequency ratio decreases,the unilateral continuous collision times between the main system and the free mass increase from one collision to multiple collisions,and sticky behavior appearsunder the condition of low frequency ratio.(2)Small clearanceis prone to chatter.With the increase of the clearance,the frequency ratio range of the chatteringin the systemdecreases.When the clearance exceeds a certain critical value,the systemhasn’t the chattering behavior.