| 英文摘要 |
The purpose of this project is to establish data base for environmental vibration in Taiwan, it includes
1.Vibration measurement with no specific vibration sources.
2.Vibration measurement with specific vibration source.
The locations for vibration measurement without specific source include
1.40 locations in Taipei City;
2.20 locations inside industrial zones in Northern Taiwan;
3.10 locations along the track of Taiwan High Speed Rail System.
The locations for vibration measurement with specific vibration source include
1.10 locations for cooling tower;
2.10 locations along Taipei Rapid Transit System;
3.10 locations in construction sites.
Measured vibration data were processed according to several standards including ISO2631-1(1997), ISO 2631-2(2003), JIS vibration regulation on Shinkansen and JIS C1510(1995) and compared with raw vibration data, and these data were presented both in unit of acceleration and velocity. For conforming to individual standards, the reference acceleration for ISO is 10-6 m/s2, and 10-5 m/s2 for JIS standard.
If the above standards were adopted, it is required that the measurement device, i.e. accelerometers should be placed on a level surface, and measuring three mutual perpendicular directions, one is vertical to the ground and two are parallel to the ground surface. And there are several steps needed to be taken to assure correct measurement,
1.The frequency range should be at least cover 1to 80 Hz,
2.The frequency analysis should be done in 1/3 Octave Band,
3.Measurement should be taken in one second interval.
From the measurement results, which were processed using procedure stated in ISO standards, the environmental vibrations, usually, are in the magnitude of about 50~60 dB. As for vibration with specific sources, the vibration magnitudes are between 60~80 dB, which is significantly higher than the environmental vibration. These measured data base will be helpful in determining the base values for environmental vibrations as well as vibration limits for differen
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