The common aspect of all these publications is that the helical
springs of the spring-mass systems attached are not taken into
account. As a first step to fill this gap, Gürgöze (2005) derived the
frequency equation of a classical combined system consisting of a
cantilevered beam to the tip of which is attached a helical springmass
system, the novelty being that the helical spring is modeled
as a longitudinally vibrating elastic rod (James et al., 1994). Wu
(2005) has taken into account the inertia effects of the helical
springs, for free vibrations analysis of a Bernoulli–Euler beam carrying
multiple two-degree-of freedom systems by using equivalent
mass method. Gürgöze et al. (2006) dealt with the determination
of the frequency equation of a Bernoulli–Euler beam simply supported
at both ends, to which is attached in-span a longitudinally
vibrating elastic rod with a tip mass, representing a helical springmass
system with mass of the helical spring considered. In a further
study, Gürgöze et al. (2008) investigated a cantilevered beam with
a tip mass and in-span an axially vibrating visco-elastic rod with
a tip mass, based under the assumption that the helical spring is
made of a visco-elastic material fitting to the Kelvin–Voigt damping