Summary 　　　Contents 　　　Members 　　　Album 　　　Collaborator 　　　Links
		Although vibration is generally generated by a certain source of a shock by change of shock power or the power repeated, it may generate automatically. The former is 々, such as a shake of the structure by vibration whose run of the numbness when hitting a ball with the vibration when hitting by vibration generated while working a press machine and a forge machine, vibration of a rotation machine depended disproportionately, and stock tool like a breaker, and a bat, a car, or railroad vehicles excites a road surface, and the earthquake. Noise is also vibration accompanying vibration of air and a wall. Self-vibration is in the thing representing the latter example. the flagstaff which shakes although there is no source of vibration in near, and a clothespole -- main -- a tower -- the shake of a structure or a skyscraper and this phenomenon are self-vibration called whirlpool excitation generated when the cycle of the whirlpool generated in the reverse-side side of these structures is in agreement with the cycle to which a structure tended to vibrate Although various methods were devised in order to solve this problem for many years or to mitigate since these vibration caused various problems, such as an oscillating obstacle done to about [ spoiling the reliability of a machine, accuracy, quality, a life, etc. ], safety, and a human body, and noise pollution, the latest machine and equipment, and a structure are in lightweight-izing and the tendency made flexible more, and control of a more complicated vibration is called for. 　At the Watanabe laboratory, research which controls vibration of the structure of a more flexible and complicated form scientifically is done. In order to control vibration of these structures effectively, you have to know a partner's vibrating action and oscillation characteristic correctly. The methodology for designing an oscillating control device the optimal on it needs to be built. At this laboratory, after knowing an oscillation characteristic correctly, making full use of an experiment modal analysis method and the limited element analyzing method, the non-connected model creating method of a complicated flexible structure and the low dimension model creating method are established. The former is the method of creating many 1 flexibility system models and carrying out the optimal design of the passive (passive) system vibration device for every 1 flexibility system. The latter is the method of creating a number required for control of concentration constant system models, and carrying out the optimal design of the active system vibration device using control theory. 　Until now, although it has succeeded in oscillating control of many structures using the above method, I introduce a research result according to an easy example. Fig. 1 shows the track car which passes through a bridge. Since it passes through a bridge while a track vibrates up and down, a bridge vibrates, and it will be transmitted to the ground, will cause foundation vibration, and will get across to a house. Since the amount of [ which was supported with the support ] central part is the largest and a bridge shakes, the optimal design of this shake will be carried out, and it should just attach the vibration control equipment called tuned mass damper in the central part. Although vibration of a figure is called vibration in basic mode, vibration is not only this much, is twisted and has vibration in the mode, and still higher order oscillating mode. If the method developed at this laboratory is used, it is possible to control all the oscillating modes considered to be required. If it hits poor with a metal baseball bat, does numbness come to a hand? If a ball is hit near the belly (place where amplitude is the largest) in oscillating mode as shown in Fig. 2, an intense vibration will get across to a hand and numbness will be felt. Then, if the optimal design of the tuned mass damper is carried out and it is confined in a grip end, it will not be numbed even if it catches a hit ball where. 　 skyscraper and a huge bridge -- main -- a big shake may generate a tower by the strong wind Of course, it may destroy by vibration by the earthquake. In order to raise amenity and safety, it is very important work to control vibration of a building. At my laboratory, the oscillating controlling method (the building connection system vibration method) for having used the mutual action of buildings as shown in Fig. 3 with an illustration is proposed, and active control and research which carries out passive are done. This method is effective in raising the safety to a big earthquake. happy -- this proposal is accepted and the skyscraper of three buildings connected with figure 4 by the building connection system vibration method [ like ] at present is building it at Harumi By connecting three skyscrapers with the vibration control equipment called two control bridges, this is the first trial in the world which controls the shake by the strong wind actively. Also in a light and flexible structure like a space structure, vibration becomes a problem. My laboratory also makes oscillating control of such a problem elated. Fig. 5 is the illustration of a space station. If an antenna shakes, can't exact communication be performed with the earth? Then, research which this problem solves is done by controlling vibration of solar cell PADORU. To others, research which stops various vibration, such as vibration of piping, vibration of a car, and vibration of an information machine, is done. Back
		|Home | Contact us|