Kyu-Hyun Han

A STUDY ON IMPACT ANALYSIS OF SIDE KICK IN TAEKWONDO

Taekwondo is a martial art form and sport that uses the hands and feet for attack and defense. Taekwondo basic motion is composed of the breaking, competition and poomsea motions. The side kick is one of the most important breaking motions. The side kick with the front foot can be made in two steps. In the first step, the front foot is extended forward from the back stance free-fighting position. For the second step, the rear foot is followed simultaneously. Then, the side kick is executed while the entire body weight rests on the rear foot. In this paper, the impact analysis on a human model for kicking posture was carried out. The ADAMS/LifeMOD used numerical modeling and simulation for the side kick. The numerical human models for assailant and opponent in competition motion were developed. The maximum impact force on the human body was obtained by experiment and was applied to impact simulation. As a result, the impact displacement and velocity of the numerical human model were investigated.

A Study on the Dynamic and Impact Analysis of Side Kick in Taekwondo

Taekwondo is a martial art form and sport that uses the hands and foot for attack and defense. Taekwondo basic motion is composed of the breaking, competition and poomsea motion. In the side kick among the competition motion, the impact force is larger than other kinds of kicks. The side kick with the front foot can be made in two steps. In the first step, the front foot is stretched forward from back stance free-fighting position. For the second step, the rear foot is followed simultaneously. Then, the kick is executed while entire body weight rests on the rear foot. In this paper, impact analysis of the human model for hitting posture is carried out. The ADAMS/LifeMOD is used in hitting modeling and simulation. The simulation model creates the human model to hit the opponent. As the results, the dynamic analysis of human muscle were presented.

Fatigue Test and Simulation on the Steel Welded L-Shaped Frame

A fatigue test on the steel welded L-shaped frame was conducted. The frame was consisted with carbon steel tube and reinforced bracket. The four type reinforced brackets were fabricated. They were two rectangular plate reinforced bracket, two sided pentagon plate reinforced bracket, triangular plate reinforced bracket and fully reinforced bracket. The fatigue test of frame was conducted with axial tension loading. The fatigue simulation of the steel welded L-shaped frame was also performed by the finite element method with code FEMFAT. The frame of fully reinforced bracket had the highest fatigue life and reinforced quality factor.

Simplified Method for Prediction of Cooling Load

A simplified method is developed to predict the hourly cooling load of the next day. Only four building specifications and the estimated temperature and humidity of the next day are used to predict the cooling load. The sensible heat loads are calculated using the sensible heat coefficient, outdoor air coefficient, and sensible heat constant. Similarly, the latent heat loads are calculated using the outdoor air coefficient, latent heat constant. Four building specifications, that is, sensible heat coefficient, outdoor air coefficient, sensible heat constant and latent heat constant are determined from the building design data for cooling load. In order to validate the prediction model, two benchmarking buildings are selected, and cooling loads are measured in the actual operation conditions. The predicted results show fairly good agreement with the measured data for both buildings.Copyright