Vibration of vibration are pulling a child back on a swing and letting it go, or hitting a tuning fork and letting it ring. The mechanical system vibrates at one or more of its natural frequencies and damps down to motionlessness. Forced vibration is when a time-varying disturbance (load, displacement or velocity) is applied to a mechanical system. The disturbance can be a periodic and steady-state input, a transient input, or a random input. The periodic input can be a harmonic or a non-harmonic disturbance. Examples of these types of vibration include a washing machine shaking due to an imbalance, transportation
Oh, What Songs of the Heart blest, There's no word, there's no thought can impart, But our rapture will be All the soul can attest, In the heavenly songs of the heart; But our rapture will be In the vision we'll see Best expressed in the songs of the heart Oh, what songs we'll employ! Oh, what welcome we'll hear! When we kneel at our dear Savior's feet. And the heart swells with joy In embraces most dear When our heavenly parents we meet! Oh, what songs we'll employ As the heart swells with joy, When our heavenly parents we meet! </poem> "Oh, What Songs of