| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
This research project is concerned with analysis of the best achievable performance level of vibration attenuation by means of passive mechanical networks, with the use of the inerter, a recently invented passive mechanical element, in mind. It has been shown that the inerter may improve the performance when measured in terms of the H2 norm or H-infinity norm but that the improvement can be marginal for a system with a soft spring. Also, it is shown that the inerter may be beneficial when there is a constraint on the travel of the vibration absorption part. An algebraic method is developed that tunes system parameters in order to optimize the H-infinity performance. Moreover, the notion of `average damping ratio' is introduced, and it is shown that the quantity can algebraically be characterized, which further leads to an approach that minimizes the H2 performance under a constraint on the average damping ratio.
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