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聚氨酯软质泡沫塑料(PIII类)具有良好的弹性恢复能力和较低的弹性模量,材料隔振系统的固有频率比较低。为了具体了解它的隔振性状,我们对这种材料在常温条件下块状材料厚度方向的隔振性能进行了试验。试验主要包括(1)测量材料的动态应力-应变关系,以了解材料的阻尼特性;(2)测量材料隔振系统的最大绝对传递率及其相应频率和某些高频点上的绝对传递率,以了解材料的刚度特性。在确定系统刚度和阻尼参数随荷重W、材料厚度L和动应变ε的变化关系中,W分别取每平方厘米0.0125、0.025、0.05、0.10公斤,L分别取2.7、5.4、10.8厘米,共
Polyurethane flexible foam (PIII) has good elastic recovery and low modulus of elasticity, vibration isolation system of natural frequency is relatively low. In order to understand its vibration isolation characteristics, we tested the vibration isolation performance of this material in the thickness direction of bulk materials at room temperature. The tests mainly include (1) measuring the dynamic stress-strain relationship of the material to understand the damping characteristics of the material; (2) measuring the absolute maximum transmissibility of the material vibration isolation system and its corresponding frequency and the absolute transmissibility at some high frequency points To understand the stiffness characteristics of the material. In determining the system stiffness and damping parameters with load W, material thickness L and dynamic strain ε changes, W were taken 0.0125,0.025,0.05,0.10 kg per square centimeter, L, respectively, 2.7,5.4,10.8 cm, a total of