Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 60

As an illustrative example consider the forced two‐degree of freedom system of Example 2.6, where k₁ = k₂ = k and m₁ = m₂ = m. In addition, two equal dampers of damping constant R are connected in parallel to the springs. The displacement amplitudes A₁ and A₂ can be determined from Eq. (2.50). Figure 2.14 shows the response of ∣A₁∣ and ∣A₂∣ with the forcing frequency. Note that both ∣A₁∣ and ∣A₂∣ reach maximum values at the same frequencies given by Eq. (2.33). It is also noted that the mass m₁ theoretically does not move when the excitation frequency is .