[O-08] Poster presentations by senior high school students

[O08-P57] Design structure for earthquake-resistant lighting

*Rio Egami¹, *Chiharu Hosokawa¹ (1.Fukui prefectual wakasa high school)

Keywords:Earthquake, Hanging Lighting

We began our exploration because Japan is an earthquake-prone country and has experienced major disasters in the past, including the Great Kanto Earthquake, the Great East Japan Earthquake, and the Great Hanshin-Awaji Earthquake. Recently, the Noto Peninsula earthquake occurred in Ishikawa Prefecture on January 1, 2011, and caused a lot of damage on a large scale. When an earthquake occurs, the possibility of loss of life due to secondary disasters increases. We focused on lighting to see what we could do to minimize the damage. The reason why we focused on lighting is that we were initially exploring disaster prevention and mitigation on the scale of a house, but we realized that the scale was too large for us to solve, so we focused on furniture in the house. In fact, while some solutions have been developed for disaster prevention and mitigation, such as cupboards, we decided to focus our exploration on lighting, a subject that has not received much attention. There are many types of lighting. For example, chandeliers and hanging lights are expensive and well designed. However, if they were to fall during an earthquake, they would cause even more damage in addition to the shaking, such as fire from electrical leakage. Some people have suggested that damage could be minimized by using recessed lighting that does not fall off easily when shaken. However, in addition to the goal of creating a product with excellent design and functionality, the fact is that many houses in Japan today are traditional, and embedded lighting is not widely used. Therefore, we thought it would be a high-demand exploration. The content of the exploration was discussed based on a total of two experiments, in which issues were discovered and solutions were sought through repeated experiments. In the first experiment, we modeled a house and tested a simple hanging light in the house model, using weights and other experimental tools to cause shaking manually. In the second experiment, we improved the model based on the issues raised in the first experiment. We placed a pulley base under the model to eliminate free movement, and manually generated the swaying by setting a constant swaying width and rhythm. In the second experiment, we conducted a control experiment by substituting chains, springs, wooden rods, and conductors for the suspending parts of the hanging lights. As a result, we found that the strongly elastic material shook irregularly and greatly, while the weakly elastic material shook uniformly. The first experiment was conducted in a model of a house, and a simple suspended light was used to manually cause swaying using weights and other experimental tools.
The issues and solutions obtained from a total of two experiments were that only horizontal shaking experiments were conducted. Therefore, we would like to conduct a vertical shaking experiment. And since we only tested the rhythm of the shaking in one way, we did not know if the results were accurate or not. We would like to try other rhythms in the next experiment. Furthermore, the lengths of the experimental subjects were unified in the experiments. From this, we believe that the results may change if we conduct experiments with various lengths. I would be happy to contribute to Japan and the world through this kind of research.