Àüü 8 page Áß 1 page±îÁö ¹Ì¸®º¸±â°¡ °¡´ÉÇÕ´Ï´Ù.
¼Ò°³±Û
Á¦¸ñ : ºñÁ¢ÃË ÃÊÀ½ÆÄ Å½»ó±â¹ýÀ» ÀÌ¿ëÇÑ ½ºÆý¿ëÁ¢ºÎ ¹× ź¼Òº¹ÇÕüÀdz»ºÎ °áÇÔÆò°¡
ÀúÀÚ : °û³²¼ö, À̽Âö
¹ßÇàÇÐȸ : Çѱ¹»êÇбâ¼úÇÐȸ [The Korea Academia-industrial cooperation Society]
¹ßÇàÁ¤º¸ : Çѱ¹»êÇбâ¼úÇÐȸ³í¹®Áö Á¦ 15±Ç 11È£ pp.6432-6439(8 pages)
¹ßÇà³âµµ : 2014
ÀúÀ۽ñâ : 2014³â 11¿ù
¸ñÂ÷
1. ¼·Ð
2. ÀÚµ¿ ½ºÄµ È»óÀåÄ¡
3. NAUT È»ó Ž»ó
4. °á ·Ð
º»¹®³»¿ë
NAUT(Non contact Air coupled U
ltrasonic Testing)±â¹ýÀº ÃÊÀ½ÆÄ Å½»ó¹ý ÁßÀÇ Çϳª·Î¼ °ø±âÁß À½Çâ ÀÓÇÇ´ø½ºÀÇÂ÷ÀÌ·Î »ý±â´Â ¿¡³ÊÁö ¼Õ½ÇÀ» High Power ÃÊÀ½ÆÄ Pulser Receiver, PRE-AMP, °í°¨µµÀÇ Å½ÃËÀÚ·Î º¸¿ÏÇÏ¿© ºñÁ¢Ã˽ÄÀ¸·ÎÃÊÀ½ÆÄ Å½»óÀ» °¡´ÉÇÏ°Ô Çϴ Ž»ó ¹æ¹ýÀÌ´Ù. NAUT´Â ÃÊÀ½ÆÄÀÇ ¼Û½Å ¹× ¼ö½ÅÀÌ ¾ÈÁ¤µÈ »óÅ¿¡¼ ÀÌ·ç¾îÁö¹Ç·Î ±âÁ¸ÀÇÁ¢ÃË½Ä Å½»óÀ¸·Î´Â ºÒ°¡´ÉÇÏ¿´´ø °í¿Â, Àú¿ÂÀÇ ¹°ÁúÀ̳ª ½ÃÇèÆíÀÇ Ç¥¸éÀÌ °ÅÄ£ ºÎºÐ, Á¼Àº ÁöÁ¡ µî¿¡¼µµ Ž»óÀÌ °¡´ÉÇÏ´Ù.º» ¿¬±¸¿¡¼´Â NAUT±â¹ýÀÇ »ê¾÷ü ½Ç¿ë¿©ºÎ¸¦ ¾Ë¾Æº¸±â À§ÇØ ÀÚµ¿Â÷»ý»ê °øÁ¤¿¡¼ ¸¹ÀÌ »ç¿ëÇÏ´Â ½ºÆý¿ëÁ¢ºÎ ¹× CFRPÁ¦Ç°¿¡ ÀÖ¾î »ó¿ëÈ ¿¬±¸¸¦ ÅëÇØ ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. º» ¿¬±¸¿¡¼´Â NAUT±â¹ýÀÇ »ç¿ë ¿©ºÎ¸¦ ¾Ë¾Æº¸±â À§ÇØ ÀÚµ¿Â÷ ºÎÇ°¿¡¼ ¸¹ÀÌ »ç¿ëÇÏ´Â ½ºÆý¿ëÁ¢ºÎ ¹× CFRP ºÎÇ°ÀÇ ³»ºÎ°áÇÔ °ËÃâÀ» °ËÃâÇÏ¿´´Ù. ½ºÆý¿ëÁ¢ºÎ¿¡¼´Â ÃÊÀ½ÆÄÀÇ Åõ°úÀ²À̳ô¾Æ Àû»öÀ¸·Î ³ªÅ¸³µÀ¸¸ç, º¹ÃþÀ¸·Î µÈ ºÎºÐÀº Åõ°úÀ²ÀÌ ³·¾Æ û»ö È»óÀÌ ³ªÅ¸³µ´Ù. ¶ÇÇÑ ÃøÁ¤ ¼Óµµ¸¦ °áÁ¤ÇÏ´Â Áß¿ä¿ä¼ÒÀÎPRF(Pulse Repetition Frequency;¼Û½ÅÆÞ½ºÁÖ±â)¿¡ µû¶ó »ö»ó ¼±¸íµµÀÇ Â÷À̸¦ º¸¿´´Ù. CFRP ½ÃÇèÆí ¶ÇÇÑ È»óÀåÄ¡¸¦ ÅëÇØÃëµæµÈ °¢ È»ó °á°ú¸¦ º¸°í ³»ºÎ °áÇÔÀÇ ¸ð¾ç, Å©±â, À§Ä¡ µîÀÇ ÆľÇÀÌ ´Ü½Ã°£¿¡ °¡´ÉÇÏ¿´´Ù. ½ÇÇèÀ» ÅëÇØ NAUT±â¹ý°úÈ»óÈ°¡ µ¿½Ã¿¡ ÀÌ·ç¾îÁüÀ» È®ÀÎÇÏ¿´°í, ½ºÆý ¿ëÁ¢ºÎ¿Í CFRP Ž»ó¿¡ NAUTÀÇ Àû¿ëÀÌ °¡´ÉÇÑÁö ±× ½ÇÇö¿©ºÎ¸¦ È®ÀÎÇÏ¿´´Ù.
The NAUT (Non-contact Air cou
pled Ultrasonic Testing) technique is one of the ultrasonic testing methodsthat enables non-contact ultrasonic testing by compensating for the energy loss caused by the difference in acousticimpedance of air with an ultrasonic pulser receiver, PRE-AMP and high-sensitivity transducer. As the NAUT isperformed in a state of steady ultrasonic transmission and reception, testing can be performed on materials of highor low temperatures or specimens with a rough surface or narrow part, which could not have been tested using theconventional contact-type testing technique. For this study, the internal defects of spot weld, which are often appliedto auto parts, and CFRP parts, were tested to determine if it is practical to make the NAUT technique commercial.As the spot welded part had a high ultrasonic transmissivity, the result was shown as red. On the other hand, thepart with an internal defect had a layer of air and low transmissivity, which was shown as blue.In addition, depending on the PRF (Pulse Repetition Frequency), an important factor that determines the measurementspeed, the color sharpness showed differences. With the images obtained from CFRP specimens or an imaging device,it was possible to identify the shape, size and position of the internal defect within a short period of time. In thispaper, it was confirmed in the above-described experiment that both internal defect detection and image processingof the defect could be possible using the NAUT technique. Moreover, it was possible to apply NAUT to the detectionof internal defects in the spot welded parts or in CFRP parts, and commercialize its practical application to various fields. (ÀÌÇÏ »ý·«)
Âü°í¹®Çå
¾øÀ½
¹ÞÀº º°Á¡
0/5
0°³ÀÇ º°Á¡
¹®¼°øÀ¯ ÀڷḦ µî·ÏÇØ ÁÖ¼¼¿ä.
¹®¼°øÀ¯ Æ÷ÀÎÆ®¿Í Çö±ÝÀ» µå¸³´Ï´Ù.
Æ÷ÀÎÆ® : ÀÚ·á 1°Ç´ç ÃÖ´ë 5,000P Áö±Þ
Çö±Ý : ÀÚ·á 1°Ç´ç ÃÖ´ë 2,000¿ø Áö±Þ
ÀúÀÛ±Ç Á¤º¸
À§ Á¤º¸ ¹× °Ô½Ã¹° ³»¿ëÀÇ Áø½Ç¼º¿¡ ´ëÇÏ¿© ¾ÅÅ©Á¸Àº º¸ÁõÇÏÁö ¾Æ´ÏÇϸç, ÇØ´ç Á¤º¸ ¹× °Ô½Ã¹° ÀúÀ۱ǰú ±âŸ ¹ýÀû Ã¥ÀÓÀº ÀÚ·á µî·ÏÀÚ¿¡°Ô ÀÖ½À´Ï´Ù.
À§ Á¤º¸ ¹× °Ô½Ã¹° ³»¿ëÀÇ ºÒ¹ýÀû ÀÌ¿ë, ¹«´Ü ÀüÀ硤¹èÆ÷´Â ±ÝÁöµÇ¾î ÀÖ½À´Ï´Ù.
ÀúÀÛ±ÇħÇØ, ¸í¿¹ÈÑ¼Õ µî ºÐÀï¿ä¼Ò ¹ß°ß½Ã °í°´¼¾ÅÍÀÇ ÀúÀÛ±Ç Ä§ÇØ½Å°í¸¦ ÀÌ¿ëÇØ Áֽñ⠹ٶø´Ï´Ù.
ºê·£µå Á¤º¸
°í±Þ ³í¹®À» Á¦°øÇÏ´Â ÇÐÁö»ç ´º³í¹®Àº Àü¹® Çо÷ ºÐ¾ß¿¡ ÃÖ°íÀÇ ÀڷḦ º¸ÀåÇϸç
°¢Á¾ ¿¬±¸ »ç·Ê¿Í ¹Ì·¡ ºÐ¼® µîÀÇ ÀڷḦ ÅëÇØ Àι®ÇÐ, »çȸ ÀÚ¿¬°úÇÐ ºÐ¾ßÀÇ ±íÀÌ Àִ Ž»öÀ» ÇÒ ¼ö ÀÖ°Ô µµ¿Íµå¸®°Ú½À´Ï´Ù.
ÆǸÅÀÚ·á ¼ö : 32,704°Ç