| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
In order to reduce vibration of tool handles which is known as an occurrence factor of the hand-arm vibration syndrome, the two types of very low-vibrational tools, electric hammer and tamping rammer, has been developed by using the generation mechanism of synchronous vibration. The availability of the synchronous vibration generated in the prototype experimental apparatus was investigated based on sand compaction tests and numerical computations. The results confirm that the stable synchronized vibrations which are able to achieve a good balance between vibration control and excitation could be generated by setting the system parameters appropriately. The fracturing experiment of a cement block using the prototype of electric hammer has been successful but it is still far from enough. In the tamping rammer, the prototype with high power motors has been developed and confirmed that impact force is significantly increased.
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