Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 62
Solution
ОглавлениеThe natural frequency of the original system is 15.9 Hz = 100 rad/s. Then, the stiffness k1 = m1(ω)2 = 45.5(100)2 = 455 000 N/m. Now, the operating frequency of the motor is 764/60 = 12.7 Hz = 80 rad/s, so the absorber should have the natural frequency 80 rad/s. Then, the total stiffness of the absorber is
Figure 2.14 Forced response spectra of a damped two‐degree of freedom system.
Figure 2.15 Undamped dynamic vibration absorber defined in Example 2.9.
