시험 방법에 따른 바(Bar) 형 시편의 동특성 비교

Study on the Test Method for Measuring Vibration Damping Properties using Bae Type Specimen

Different test methods were used to measure and compare the loss factor of a steel beam. They are free vibration logarithmic decay method, half-power bandwidth method using narrow-band analysis, wide-band analysis method with inverse FFT. In these tests, specimens are clamped at one end. Free vibration method and half-power bandwidth method gave good results. Effect of vibration pick-ups were tested. We also tried center excitation method but could not obtain loss factor.