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微振激励下黏弹性阻尼器微观链结构力学模型

MICROSCOPIC MOLECULAR CHAIN STRUCTURE MODEL OF VISCOELASTIC DAMPER UNDER MICRO-VIBRATION EXCITATIONS

  • 摘要: 减小微振动对高精密仪器至关重要,利用黏弹性阻尼器进行微振动抑制是一个新兴而又具有挑战性的课题.本文采用分子链网络模型方法分析了黏弹性材料的微观分子链结构,综合考虑材料分子链结构中的网络链和自由链对黏弹性材料力学性能的影响,提出一种基于材料微观分子链结构的微振激励下黏弹性阻尼器力学模型.模型分别采用标准线性固体模型和Maxwell模型来描述网络链和自由链中单个链的力学性能,并分别采用8链网络模型和3链网络模型考虑两种类型分子链的综合效应,引入温频等效原理描述温度对微振激励下黏弹性阻尼器力学性能的影响.该模型能够描述温度和频率对黏弹性阻尼器动态力学性能的影响,并能够反映黏弹性材料的微观结构与材料力学性能的关系.为验证所提模型的有效性及考察黏弹性阻尼器在微振激励下的耗能能力和动态力学性能,在微振条件下对黏弹性阻尼器进行了动态力学性能试验.研究结果表明黏弹性阻尼器具有较好的微振耗能能力,其动态力学性能受温度和频率影响较大,所提的力学模型能够精确地描述微振激励下黏弹性阻尼器动态力学性能随温度和频率的变化关系.

     

    Abstract: It is of great importance to reduce micro-vibration e ect on precision instrument, and employing viscoelastic damper to reduce micro-vibration is an innovative and challenging issue. In this paper, the molecular chain network model is employed to analyze the viscoelastic material microstructures, and the e ect of the network chains and free chains on the viscoelastic properties of viscoelastic material is comprehensively considered, and then a mechanical model of VE damper under micro-vibration is proposed based on molecular chain structures. The standard linear solid model and Maxwell model are adopted to describe the mechanical behaviors of the single network chain and single free chain, respectively. Moreover, eight-chain network model and three-chain network model are then employed. Additionally, temperature-frequency equivalent theory is adopted to reflect the temperature e ect. The proposed model is able to describe the mechanical properties of viscoelastic damper at di erent frequencies and temperatures, and this model can reflect the material microstructure e ect on its viscoelastic properties. To verify the proposed model and reveal the mechanical behavior of viscoelastic damper under micro-vibration excitations, tests on viscoelastic damper are carried out. The results show that viscoelastic damper has good energy dissipation capacity; the dynamic properties are significantly influenced by frequency and temperature, and the proposed model can accurately describe the dynamic properties of viscoelastic damper at di erent temperatures and frequencies under micro-vibration excitations.

     

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