Document Type : Original Article
Assistant professor, Mechanical Design Dept., Faculty of Engineering – Mataria, Helwan University, Cairo, Egypt.
This work deals with the reduction of vibration levels for rolling systems such as
ropeway gondola, cranes and ships using a dynamic vibration absorber (DVA). The
optimum values of the DVA damping factor and the spring constant are determined
numerically through minimizing a maximum response of the main system. Single
DVA (SDVA) and multi- masses DVA (MDVA) in parallel configurations are
examined. A Mini-max criterion optimization method is utilized to calculate the
optimum design parameters of the DVA for many numbers of DVA masses with a
constant total mass. The results obtained that the rising of the mass ratio leads to
decrease the vibration levels. Using the MDVA leads to enhanced robustness and
vibration attenuation in the main system at the expense of growing the vibration in
the absorber. MDVA compared with SDVA have some advantages such as lower
frequency ratios and low fatigue.