Dyn
amic responses of
a line
ar oscill
ator coupled to
a nonline
ar energy sink (NES) under h
armonic forcing in the regime of 1:1:1 reson
ance
are investig
ated. Prim
ary
attention is p
aid to the det
ailed investig
ation of the so-c
alled strongly modul
ated response (SMR), which is not rel
ated to the fixed points of
aver
age modul
ation equ
ations of the system. Essenti
al m
ass
asymmetry
allows
a glob
al
an
alysis of the responses despite strong nonline
arity. It is demonstr
ated th
at the strongly modul
ated response is rel
ated to
a rel
ax
ation-type motion
and its description in the limit of sm
all m
ass r
atio m
aybe reduced to the 1D return m
ap of
a subset
at
a fold line of slow inv
ari
ant m
anifold. The SMR exists in the <
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O(
ε)
a>-vicinity of the ex
act reson
ance, where <
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ε![](http://www.sciencedirect.com/scidirimg/entities/226<font color=)
a.gif"
alt="much less-th
an" title="much less-th
an" border="0">1
a> ch
ar
acterizes the m
ass
asymmetry. It is
also shown th
at the SMR
appe
ars in the system
as
a result of glob
al fold bifurc
ation of limit cycles
and exhibits some properties pertinent to generic 1D nonline
ar m
aps, such
as period doubling. Tr
ansient responses with finite number of rel
ax
ation cycles
and subsequent
attr
action to st
able periodic
attr
actor
are reve
aled. An
alytic results
are comp
ared to numeric simul
ations
and
a good
agreement is observed.