Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 61

A small electric motor is fixed on a rigid rectangular plate resting on springs. The total mass of the motor and the plate is 45.5 kg. The system is found to have a natural frequency of 15.9 Hz. It is proposed to suppress the vibration when the motor operates at 764 rpm by attaching an undamped vibration absorber underneath the motor, as shown in Figure 2.15. Determine the necessary stiffness of the absorber if m₂ = 4.5 kg.