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¹Ì¼Ò Áøµ¿ ÃøÁ¤À» À§ÇÑ Æú¸®¸Ó Áøµ¿¼¾¼ °³¹ß / Measurement of Low-frequency, Low-amplitude Vibrations |
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Çѱ¹¼ÒÀ½Áøµ¿°øÇÐȸ ³í¹®Áý, Vol.34 No.01 (2024-02) |
ÆäÀÌÁö |
½ÃÀÛÆäÀÌÁö(71) ÃÑÆäÀÌÁö(7) |
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°¡¼Óµµ¼¾¼; Áß·®Ãæ°Ý; Áøµ¿; ¾ÐÀü¼¾¼; Çø®ºñ´Ò¸®µ§ Ç÷ç¿À¶óÀ̵å ; Accelerometer; Heavy-Weight Impact; Vibration; Piezoelectic sensor; PVDF |
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°Ç¹°À̳ª ±³·®°ú °°Àº ¹Ý°Ã¼ ±¸Á¶¹°Àº ´Ù¾çÇÑ ÈûÀÌ °¡ÇØÁú ¶§ ³·Àº ÁÖÆļö¿Í Áøµ¿ Å©±â¸¦ ³ªÅ¸³»¸ç À̸¦ ¸ð´ÏÅ͸µÇÏ´Â °¡Àå ÁÁÀº ¹æ¹ýÀº ¾ÐÀüÇü °¡¼Óµµ°è¸¦ ¹èÄ¡ÇÏ´Â °ÍÀÌ´Ù. ¼¼¶ó¹Í ¾ÐÀüÇü °¡¼Óµµ°è´Â ¸¹Àº Çϵå¿þ¾î ºñ¿ëÀÌ ¹ß»ýÇÏ¸ç º» ¿¬±¸¿¡¼´Â ÀÌ·¯ÇÑ ±¸Á¶¹°¿¡ ºñ¿ë´ëºñ È¿°úÀûÀÎ Æú¸®¸Ó¼¾¼¸¦ °³¹ßÇÏ¿´´Ù. Á¦¾ÈµÈ ¼¾¼´Â 30Hz ´ë¿ªÀÇ 0.001~0.01G ÀÇ Áøµ¿½ÅÈ£¸¦ °èÃøÇÒ¼ö ÀÖÀ¸¸ç, Æò°¡¿¡´Â ½ÇÇè½Ç¿¡¼ °íÀ¯Áøµ¿¼ö¿Í ±×¿¡ µû¸¥ ÀÀ´ä Å©±â¸¦ ºÐ¼®ÇÏ¿´´Ù. ƯÁ¤ ÁÖÆļö ´ë¿ªÀ» ¸ñÇ¥·Î °³¹ßµÈ Æú¸®¸Ó ¼¾¼´Â ¾ÆÆÄÆ® ÁÖÅÃÀÇ ¹Ù´Ú°ú °°Àº ¹Ý°Ã¼ ±¸Á¶¹°ÀÇ Áøµ¿ ¸ð´ÏÅ͸µ¿¡ ¸¹Àº ÀÌÁ¡À» °¡Áö°í ÀÖ´Ù. |
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Semi-rigid structures such as buildings and bridges produce low amplitude vibration responses when various forces are applied to them. The best way to monitor low level signals is to deploy piezo type accelerometers owing to the high sensitivity and frequency bandwidth. One of the problems with piezo type sensors is the high hardware cost. In the real world, it is rare to implement piezo accelerometers for applications where precision is not of the utmost importance. In the present work, a polymer sensor is developed for vibration measurement in buildings and bridges. The sensors generate a high electric output signal even if the actual response of the structure is on the order of background noise vibration levels. The performance of the proposed sensor is experimentally verified for a target frequency of a 30Hz band signal generated from a semi-rigid concrete wall. The vibration level is in the range of 0.001 to 0.01G. The evaluation utilizes the following parameters: vibration modes, relative response level, and repeatability. The laboratory test shows that the design specifications meet the required target frequency and signal output level rigorously. We conclude that the proposed polymer sensor aimed at the specific frequency band has numerous advantages for the vibration monitoring of semi-rigid structures such as floating floors in apartment housing units. It can also be a cost-effective solution for various field problems. |