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| | Abstract | | Overall investigation by hammering test is required for the building which passed ten years from the completion, but construction of temporary scaffold is necessary, it seems that the cost burden is heavy and it is not realistic. On the other hand, the noncontact acoustic inspection (NCAI) method is an excellent method capable of detecting defects at the same level as a hammering test from a long distance. However, there is a disadvantage that it becomes difficult to generate the same flexural resonance as in the hammering test when the angle when viewing the measurement target surface from the sound source increases. Fortunately, when a sound source itself is mounted on an unmanned aerial vehicle (UAV) that is becoming popular in recent years, it is expected that the sound source position can be positively confronted and this problem of angle dependence will be solved. Therefore, in this research, we investigated outer wall inspection by NCAI method using sound source mounted type UAV. Experimental results of the outer wall specimens demonstrated that it is possible to detect delamination defects in outer wall tiles by a method using flexural resonance even for small sound sources that can be mounted on UAVs. |
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