| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Our hypothesis based on experiments and simulation using a skull bone model is that the cause of hearing loss by contact sports may possibly be related to accumulation of small concussions in the human head by the excessive impact-induced bone conduction. We evaluated this hypothesis by an impact experiments.
Impact experiments were performed using a dummy head and kendo helmet model. An accelerometer and an ultraminiature microphone were attached on impact area and ear canal of head model, respectively. Time history responses of acceleration and sound pressure to impact by a bamboo sword were measured.
In order to reduce head trauma, we proposed an impact absorption structure made by additive manufacturing technique. This honeycomb structure have high shock absorbability and breathability, which are essential for kendo players. Impact experiments found that the newly developed kendo helmet with the absorbing structure reduced damage to head model.
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