Micro-Electro-Mechanical Systems (MEMS) sensors have been widely used in Structural Health Monitoring due to their convenience and lower costs in comparison to conventional sensors. Triggered measurements are relevant in events such as earthquakes because unlike continuous measurements, they only record the structural response once an event happens. This is more cost effective and it makes the data more manageable because only the required measurements from the event are recorded. The most common method of triggering is amplitude triggering. However, lower input amplitudes (less than 0.1g) cannot be triggered by using this method. In this paper, sound triggering was introduced to allow triggered measurements for lower input amplitude values. The performance of the sound triggering and amplitude triggering were compared by a series of shaking- table tests. It was seen that sound- triggering method has a wider frequency (0.5~10Hz) and amplitude (0.01~1.0g) range of measurements. In addition, the sound triggering method performs better than the amplitude triggering method at lower amplitudes. The performance of the amplitude triggering, in terms of the triggering being simultaneous improves at higher input amplitudes.

Abstract
 1. Introduction
 2. Vibration application
  2.1 Amplitude trigger
  2.2 Sound trigger
 3. Small-scale shaking table tests
  3.1 Specimen used
  3.2 Experimental setup
 4. Shaking-table test results
  4.1 0.5Hz input frequency
  4.2 1.0Hz input frequency
  4.3 5.0Hz input frequency
  4.4 10.0Hz input frequency
 5. Analysis of shaking-table testresults
  5.1 Analysis of error rate in amplitude data
  5.2 Analysis of error rate in frequency data
 6. Conclusion
 References

• 마푼과나 시부시시웨(서울과학기술대학교 건축과) | Mapungwana, S. T.
• 이종호(서울과학기술대학교 건축과) | Lee Jong-Ho (Dept. of Architecture, Seoul National University of Science and Technology)
• 윤성원(서울과학기술대학교 건축학부) | Yoon Sung-Won (School of Architecture, Seoul National University of Science and Technology) 교신저자