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период свободных колебаний stresses
el.	free oscillation period
geophys.	free-swing period; natural period of oscillation
Makarov.	free period (маятника); free-swing period (маятника)
nautic.	period of free oscillation; period of free oscillations
tech.	free period; natural period
период свободных колебании
Makarov.	natural period
период свободных собственных колебаний
auto.	free period of motion

период свободных колебаний: 5 phrases in 5 subjects

Acoustics	1
Insurance	1
Nautical	1
Oil / petroleum	1
Seismology	1