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the method for Optimum Design of Water Rocket Flight Stability Performance Conditions Using CAE with t method and Robust Parameter Design

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Journal of Applied Mathematics and Physics 2021年第11期9卷 2669-2697页

作者： Eiji toma Yoshihiro Ito National Institute of technology Tomakomai College Tomakomai Japan

A water rocket is a rocket system that obtains thrust by injecting water with compressed air of up to about 8 atmospheres. It is usually manufactured using a pressure-resistant PEt bottle. the mechanical elements and principles contained in the water rocket have much in common with the actual small rocket system, and are suitable as educational and research teaching materials in the field of mechanics. Especially in the field of disaster prevention and mitigation, the use of water rockets is being researched and developed as a rescue tool in the event of a flood or earthquake as a disaster countermeasure. However, since the water rocket is a flying object based on the mechanical principle, it is important to ensure the accuracy and stability of the flight path. In this paper, a mechanical simulator is developed with a numerical calculation program based on the mechanical consideration of water rocket flight performance. In addition, the correlation between the flight distance obtained in the simulation and the estimated flight distance is analyzed by applying a multivariate analysis method and verifying the validity of the flight distance calculated from the result. Based on the verification results, we will apply a statistical optimization method to approach the optimization of flight stability performance conditions for water rockets.

关键词： Flying Principle Multivariate Analysis t method Robust Parameter Design Flight Stability Energetic SN Ratio

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Study of safety driving support system development for old people

Study of safety driving support system development for old p...

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第三届亚洲机械电子学学术会议

作者： takahisa Riko Shuhei Umemoto Okitoshi tsunoda Graduate School of Engineering Tokyo Denki University Ishizaka Hatoyama Saitama 350-0394 Japan

A ratio of senior drivers caused traffic accidents becomes very high in comparison with other age. We propose a system which they can escape the traffic accident. Now, it is examined by an approach of spiritual side. Specifically, it is shown that degree of risk in driving time is affected by estimated items based on a questionnaire including driving characteristics and adequate affirmation. We conduct a basic experiment based on this consideration and we propose the safety driving support system in an aging society.

关键词： safety driving aging society spiritual side physical motion degree of risk in driving time t method

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