Estimation method for shock absorbability and walking performance of wood based floors.

1.当一个物体福尔斯落在地板上时，会产生多大的力？它应该由落体和地板的力学特性来确定。推导出了预测冲击力的理论方程，并与实验结果进行了比较，两者吻合较好.研究了楼层和落体的力学性质对恢复系数的影响。发现落体与楼板荷载-变形曲线的滞回线对该系数起决定性作用。导出了恢复系数的理论计算公式，理论计算值与实验值吻合较好。但在几种楼层与落体组合的情况下，理论公式给出的值比实测值偏高。这可能与落体与地面的振动频率不同有关.分发了关于胶合板、碎料板、混凝土、ALC、地毯、Tatami-mat、氯乙烯泡沫垫（缓冲地板）或P-瓷砖地板的心理图像的调查材料。硬度图像与本研究中开发的钢瓶压痕硬度之间具有相关性。“冷”渗透与从足部到地板的热流的对数有很高的相关性。恢复系数与行走性能的图像相关性不高。“温暖度”和“柔软度”与行走性能有很高的相关性，因此“钢筒压痕硬度”和来自足部的“热流”也有很高的相关性。

1. How much strong force exerts when a body falls on a floor? It should be determined by mechanical properties of the falling body and the floor. A theoretical equation which predicts impact force was derived in this study, and good agreement with the theoretical forces and experimental ones was obtained.2. It was investigated that what kind of mechanical properties of floors and falling bodies mainly decides coefficient of restitution. And it was discovered that a hysteresis loop of load-deformation curve of the falling body and the floor gives decisive effect on the coefficient. A theoretical equation for estimating the coefficient of restitution was derived and good agreement was observed between theoretical values and experimental ones. But in several cases of combination of floors and falling bodies, the theoretical equation gives higher value than observed coefficient. This may have something to do with difference of vibration frequencies of the falling body and the floor.3. Questionnaires were distributed regarding psychological images of floors made of plywood,particleboard, concrete, ALC,carpet, Tatami-mat, vinyl chloride foam mat(cushion floor) or P-tile. Images of "hardness" has correlation between steel cylinder impress hardness which was developed in this study. "Cool" impage has high correlation between logarithm of heat flow from foot to floor. Coefficient of restitution has no high correlation between image of walking performance. "Warmness" and "softness" has high correlation between walking performance, so that "steel cylinder impression hardness" and "heat flow" from foot have also high correlation.