基于温频效应的约束型垫高阻尼结构抗振性研究

Study on Vibration Resistance of Constraint Stand-off Layer Damping Structures based on Temperature-frequency Effects

考虑黏弹性阻尼材料的温度依赖性和频率依赖性,基于黏弹性阻尼材料的本构模型,利用ANSYS和MATLAB协同仿真的模态应变能迭代法,对约束型垫高阻尼结构的抗振性进行研究。分别考察温度、厚度对约束型垫高阻尼结构振动特性指标的影响,结果表明:存在最佳温域使约束型垫高阻尼结构的抗振性最好,因此,在减振降噪工程中尽量保证工作温度和最佳温域相匹配;随着垫高层、约束层厚度的递增,存在最佳厚度使结构的模态损耗因子达到峰值,而随着阻尼层厚度的递增,结构模态损耗因子增加的幅值由大变小,因此,后续有必要开展结构的优化设计。

Considering the temperature and frequency dependences of viscoelastic damping materials and based on the constitutive model of the materials, the modal strain energy iteration method of ANSYS and MATLAB collaborative simulation is used to simulate the vibration resistance of constrained stand-off layer damping structures. The influences of temperature and thickness on the vibration characteristics of the constraint stand-off layer damping structures are investigated. The results show that there exists an optimal temperature domain which can cause the best vibration resistance effect for the constraint stand-off layer damping structure. Therefore, to ensure a good vibration and noise reduction effect,temperature of the structure should be within the optimum temperature range. With the increase of the thicknesses of the stand-off layer and the constraint layer, there exists the best thickness to make the moral loss factor of the structure reach the peak, and with the increase of the thickness of the damping layer, the amplitude of the increase of the structural modal loss factor becomes larger and smaller. Therefore, it is necessary to carry out the optimal design of the structure.