摘要
建立了含干摩擦-刚性约束的单自由度振动系统动力学模型,给出在考虑干摩擦和碰撞耦合条件下分段光滑振动系统动力学约束条件,同时引入非线性刚度因素,通过协同仿真的方法得出系统响应周期运动类型和分布区域,重点讨论了质量块发生速度黏滞和位移黏滞的动力学特征,并对低频小间隙参数域内的基本周期转迁规律进行了量化表征。研究表明,质量块与皮带之间发生的速度黏滞响应主要受激励频率影响;由于干摩擦的存在,质量块与约束面首次发生碰撞的速度更为复杂;质量块与刚性约束之间的碰撞振动响应与间隙δ和激励频率ω同时存在很强的关联关系,在低频小间隙参数域涌现了丰富的动力学响应特征。
A dynamic model of vibration system with single degree of freedom with dry friction-rigidity constraint was established,and the dynamic constraint conditions of piecewise smooth vibration system considering the coupling conditions of dry friction and collision were given.At the same time,the nonlinear stiffness factor was introduced,and the response periodic motion types and distribution regions of the system were obtained by co-simulation method.The dynamic characteristics of motion viscosity and displacement viscosity of mass blocks were discussed,and the basic periodic transition rule in the low frequency and small clearance parameter domain was quantitatively characterized.The results show that the velocity viscosity response between the mass block and the belt is mainly affected by the excitation frequency.Due to the existence of dry friction,the velocity of the first collision between the mass block and the restraint surface is more complicated.The crash-vibration response between the mass block and the rigid constraint has a strong correlation with the clearanceδand excitation frequencyω,and abundant dynamic response characteristics appear in the parameter domain of low frequency and small clearance.
作者
张凌云
刘俊杰
吕勇
韩兴国
刘忠
ZHANG LingYun;LIU Jun;JieLÜYong;HAN XingGuo;LIU Zhong(School of Mechanical Engineering,Guilin University of Aerospace Technology,Guilin 541004,China;Guangxi Key Laboratory of Special Engineering Equipment and Control,Guilin University of Aerospace Technology,Guilin 541004,China;College of Mechanical and Electrical Engineering,Tarim University,Alar 843300,China)
出处
《机械强度》
CAS
CSCD
北大核心
2024年第5期1036-1044,共9页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51765014,51965014)
广西高校中青年教师科研基础能力提升项目(2024KY0806)
桂林航天工业学院校级基金项目(XJ21KT26)资助。
关键词
干摩擦
刚性约束
速度黏滞
位移黏滞
颤碰
Dry friction
Rigid constraint
Velocity of sticking
Displacement of sticking
Chattering-impact
