Allied Services - Block Vibration Test

Block Vibration Test

Forced vertical vibration tests are carried out on concrete blocks of 1m x 1m x 1.5m at a depth of 1.5m below ground level. A mechanical oscillator is mounted on the test block such that it generates purely vertical sinusoidal vibrations. The mechanical oscillator is connected through a flexible shaft with DC motor and speed control unit. Two acceleration pick-ups duly calibrated are mounted on the block such that they sense vertical motion of the block. Choosing a suitable value of angle of setting of eccentric masses, the oscillator is made to run at constant frequency. Out put signals from pick-ups are monitored and recorded using Carrier Frequency Amplifiers (CFA) and Digital Storage Oscilloscope.