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

1. 当一个物体落在地板上时，会产生多大的力？应由落体和楼板的力学性能决定。本文推导了一个预测撞击力的理论方程，得到的撞击力与实验结果吻合较好。研究了楼板和落体的力学性能是决定恢复系数的主要因素。研究发现，落体-底板荷载-变形曲线的滞回线对该系数有决定性影响。导出了一个估算恢复系数的理论公式，理论值与实验值吻合较好。但在若干楼板与落体结合的情况下，理论方程给出的数值高于观测值。这可能与落体与地面的振动频率不同有关。对胶合板、刨花板、混凝土、ALC、地毯、榻榻米、氯乙烯泡沫垫（软垫地板）或p -瓦制成的地板的心理形象进行了问卷调查。“硬度”图像在钢瓶压痕硬度之间具有相关性。“冷”图像与从脚到地板的热流的对数有高度的相关性。恢复系数与图像的行走性能没有很高的相关性。“温暖度”和“柔软度”与行走性能有很高的相关性，因此“钢瓶压痕硬度”和“足部热流”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.