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作 者:黄子祥 谢溪凌[2] 张志谊[2] HUANG Zixiang;XIE Xiling;ZHANG Zhiyi(Ji Hua Laboratory,Foshan 528200,China;State Key Laboratory of Mechanical System and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China)
机构地区:[1]季华实验室,广东佛山528200 [2]上海交通大学机械系统与振动国家重点实验室,上海200240
出 处:《振动与冲击》2022年第21期265-271,共7页Journal of Vibration and Shock
基 金:广东省基础与应用基础研究基金(2020B1515130002);季华实验室建设资助项目(X200031TM200);中国博士后科学基金面上资助(2020M681288)。
摘 要:结合机载环境下振源激励的多向性以及安装空间的局限性,提出一种高固有频率的紧凑型三向隔振系统。该系统包含4个旋转布置的隔振器组件,每个组件由2个相互正交、刚度解耦的隔振器组成。隔振器采用了高刚度设计提高承载能力,以避免隔振对象超出规定安装空间。为降低固有频率增大对指定高频段隔振效果的不利影响,设计了三参数流体阻尼隔振器,通过增大阶数的方式提升高频衰减速率,同时流体阻尼的高损耗因子可有效抑制高频隔振下的共振放大倍数。通过子结构频响综合法建立该系统的动力学模型,并进行了有限元法(FEM)验证。在理论建模与仿真的基础上进行隔振性能测试,实测三向共振频率近似相等,约115 Hz,共振放大系数<9 dB,400 Hz处振动衰减量>10 dB,满足指定频带的传递率设计要求。Here,combined with multi-directionality of vibration source excitations and limitation of installation space in airborne environment,a compact 3-directional vibration isolation system with high natural frequency was proposed.The system was composed of 4 rotationally arranged vibration isolator components,and each component consisted of two vibration isolators being orthogonal to each other and their stiffnesses being decoupled.In the vibration isolator,a high stiffness design was adopted to improve its load-bearing capacity,and avoid vibration isolation object exceeding the specified installation space.In order to reduce unfavorable effects of increase in natural frequency on vibration isolation effect in the specified high frequency band,a 3-parameter fluid damping vibration isolator was designed to improve high-frequency attenuation rate through increasing order number.At the same time,high loss factor of fluid damping could effectively suppress resonance magnification under high-frequency vibration isolation.The dynamic model of the system was established with the substructure frequency response synthesis method and verified using FEM.On the basis of theoretical modeling and simulation,the proposed isolator’s vibration isolation performance testing was conducted.The results showed that its actually measured resonance frequencies in three directions are approximately equal,they are about 115 Hz;its resonance amplification factor is less than 9 dB;its vibration attenuation at 400 Hz is larger than 10 dB to meet design requirements of transmissivity in the specified frequency band.
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