2002 Volume 2002 Issue 5-3 Pages 805-810
The load simulator is required for the performance test of the vibro-hammering machine for construction work, which can realize the dynamic characteristics of the various types of the ground. The hydraulic servomechanism is applied to the load simulator to realize the equivalent dynamic characteristics of the ground. The magnitude and the phase angle of the mechanical impedance of the simulator on an operating vibration frequency are controlled to coincide with the reference impedance using the iterative control method, according to applied force and velocity of the vibro-hammering machine.
The performances of the load simulator are confirmed experimentally using an experimental apparatus. The accuracy of the impedance of the simulator and the number of iteration are discussed for the applied control algorithm.
The maximum operating frequency is realized at 50Hz which is applicable for super high frequency vibro-hammering work. The results show the possibility of practical use of this control method.
