摘要
针对现有准零刚度扭转隔振器仅适用于恒定负载的问题,设计了一种通过调节正刚度来适应负载变化,同步调节负刚度使隔振器始终工作在准零刚度状态的新型准零刚度扭转隔振器。该隔振器由提供负刚度的扭转磁弹簧和提供正刚度的弹簧片组成,其中扭转磁弹簧由径向磁化的内、外环磁铁组成,通过调节内、外环的轴向相对位置改变负刚度,利用等效磁荷法得到了磁弹簧的扭矩计算模型,分析了弹簧片参数对正、负刚度匹配后刚度特性的影响。建立了系统的动力学模型,采用谐波平衡法求解了隔振器的动态响应,分析了激励幅值和阻尼比对隔振器隔振性能的影响,结果表明,扭转隔振器在不同载荷状态下均具有良好的低频隔振效果。设计制造了隔振器样机,并进行了不同静载荷状态下的静力学试验,试验得到的扭矩-角位移曲线与理论计算结果吻合良好,试验结果表明,该隔振器可以通过调节磁弹簧的轴向相对位置和弹簧片的有效作用长度,实现正、负刚度的同步调节。
Here, aiming at the problem of the existing quasi-zero stiffness(QZS) torsional vibration isolator being only suitable for constant load, a new type quasi-zero stiffness torsional vibration isolator was designed through adjusting positive stiffness to adapt to load changes and synchronously adjusting negative stiffness to make vibration isolator always work in quasi-zero stiffness state. The vibration isolator was composed of a torsion magnetic spring to provide negative stiffness and a spring piece to provide positive stiffness. The torsion magnetic spring was composed of radially magnetized inner and outer ring magnets through adjusting axial relative position of inner and outer rings to change negative stiffness. The equivalent magnetic charge method was used to obtain the torque calculation model of magnetic spring, and effects of spring piece parameters on stiffness characteristics after positive and negative stiffnesses matching were analyzed. The dynamic model of the system was established, and the dynamic response of the vibration isolator was solved with the harmonic balance method. Effects of excitation amplitude and damping ratio on the vibration isolation performance of vibration isolator were analyzed. The results showed that the designed torsional vibration isolator has good low-frequency vibration isolation effect under different load conditions. The prototype of the vibration isolator was designed and manufactured, and static tests under different static load conditions were conducted for the prototype. Test results showed that torque-angular displacement curves obtained from tests agree well with the theoretical calculation results;the vibration isolator can realize synchronous adjustment of positive and negative stiffnesses by adjusting axial relative position of magnetic spring and effective acting length of spring piece.
作者
张春松
李学勇
张硕
徐定民
ZHANG Chunsong;LI Xueyong;ZHANG Shuo;XU Dingmin(School of Mechanical Engineering,Shandong University,Jinan 250061,China;MOE Key Lab of High Efficiency and Clean Mechanical Manufacture,Shandong University,Jinan 250061,China;National Experimental Teaching Demonstration Center of Mechanical Engineering,Shandong University,Jinan 250061,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第23期307-314,共8页
Journal of Vibration and Shock
基金
山东省重点研发计划(2019GGX104038)。
关键词
扭转隔振
准零刚度(QZS)
可变负载
非线性分析
torsional vibration isolation
quasi-zero stiffness(QZS)
variable load
nonlinear analysis
作者简介
第一作者:张春松,男,硕士生,1996年生;通信作者:李学勇,男,博士,副教授,1974年生。
