【摘要】 从非线性粘弹材料的动态耗能特性出发,运用渐进积分方法建立的数学模型分析了约束阻尼型隔振器在正弦载荷作用过程中的粘弹材料剪切温升历程,并对设计的剪切型约束阻尼隔振器进行正弦扫频实验。用压电传感器记录其加速度变化历程,同时使用红外线测温仪测定隔振器中粘弹材料的温升历程。通过理论曲线与试验曲线的对比,二者相似度达到90%以上,验证了温升理论模型的正确性。研究结论合理解释了不同量级下隔振器固有频率的变化以及隔振系统隔振效果的变化,振动温升变化对研究非线性粘弹性材料阻尼性能贡献、材料热损伤和破坏提供了参考依据。更多还原

【Abstract】 Based on the dynamic energy dissipation characteristics of nonlinear viscoelastic material,this paper established a mathematical modal to analysis the shearing temperature-increase process of viscoelastic material under sinusoidal force,and designed a sine sweep experiment using the constrained damping vibration isolator.The acceleration changing history and the temperature-increase process were both recorded by experimental instruments.Comparing with the theoretical curve and the experimental curve,the similarity degree reached a high level of 90 percent and successfully proved the accuracy of the temperature-increase modal.The research conclusion explained the changing tendency of the isolator’s natural frequency and isolation effect under different loading levels.Simultaneously,the vibration temperature-increase process provided references for nonlinear viscoelastic material damping tribute capability,thermal-damage and failure research during vibration.更多还原