• Transactions of the KSME C: Technology and Education
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• v.5 no.2
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• pp.81-87
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• 2017

315Fr compressor motor exceeds vibration specifications. To find the reason, first a modal impact test with free-free condition is done. Second a modal test with fixed condition is done. Thereafter the test results are compared with FEM simulation results. Using free-free condition modal impact test, FEM simulation conditions (boundary, mesh..) are modified. The motor has rolling motion around 120Hz. FEM simulation also shows same result. FEM simulation will be used to develop other series compressor motors. Using this, manufacturing test model and doing test will be useless.

• Explosives and Blasting
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• v.24 no.1
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• pp.49-56
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• 2006

There are many restrictions with a rock breaking method by using explosives in the urban area due to such safety problems as vibration, noise, and flying rock. Therefore, the use of FINECKER Plus which is mainly used as a rock breaking method (Ministry of Construction and Transportation, 2003) is gradually increasing. Accordingly, construction cases applying FINECKER Plus to the construction sites in the urban area was introduced in case studies. In addition, a comparative test on the same volume of charge applied to 360g of 1 new product 1 set and 180g of the existing FlNECKER Plus 2 sets was conducted. As a result of the test, the two cases were equivalent in breaking efficiency and the level of noise and vibration, and as for the method, the working time decreased by 32%, thus, it was proven to be excellent in terms of construction.