In a forced vibration test under harmonic excitation it was noted that the
amplitude of motion at resonance was exactly four times the amplitude at an
excitation frequency 20% higher than the resonant frequency . Determine the
damping ration of the system
答案是0.0576
想破頭看不出端倪...只有看出4倍和高出20%
請神人大哥大姊幫忙小弟..
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