DEVELOPMENT OF SEISMIC RESPONSE ANALYSIS MODEL OF HUMAN BODY BY CART-TYPE DOUBLE INVERTED PENDULUM MODEL FOR PREDICTION OF HUMAN INJURY DURING EARTHQUAKE

Abstract

 Humans need to take various actions during and after earthquake. Prediction of human injury due to hitting to wall or falling due to shaking is considered to be important to develop strategies for prevention of human injury. Seismic analysis model of human body is useful to predict the human injury during an earthquake. In the previous study, we had developed the seismic response analysis model of human body based on shaking table test with human subject. The model was constructed by cart-type single inverted pendulum. The relative displacement between shaking table and the center of pressure (CoP) of human evaluated by the model agreed well with that of the human subject. However, the relative velocity between shaking table and head of human evaluated by the model was underestimated. This was because the model was constructed by single inverted pendulum.

 In this study, we constructed the seismic response analysis model of human body by cart-type double inverted pendulum model to overcome the problem of single inverted pendulum. Two types of model were considered; the double inverted pendulum without feedback control of hip (Type I), and that with feedback control of hip (Type II). Bending of the hip of the human subject during shaking table test is considered important to improve accuracy of the model. Type II could reproduce the bending posture, while Type I could not. Thus, the relative displacement and relative velocity of head of Type II agreed well with the motion of human subject during shaking table tests.

 Finally, the validity of the model was confirmed by the simulation analysis with other input motions. The maximum displacement of CoP and head and relative velocity of head could be well reproduced by using Type II model.