COMPACTION FORCES
Amplitude. Total vertical distance the vibrating baseplate or roller travels is called the
amplitude. The amplitude of any given machine will vary depending on soil conditions.
The amplitude will gradually increase as the soil becomes denser and more compacted.
The amplitudes of a mounted compactor are substantially greater than other machine
types.
The high amplitudes of NPK Compactors are
especially effective on materials which require a
high compactive effort, such as coarse rock fill and
dry clay soils.
Static Pressure. Static pressure is the pressing
force the machine plate or foot exerts on the soil.
The forces are from the weight of the machine; and
from the carrier if the machine is a boom mounted
compactor.
The downforce produced from the weight of the
carrier machine is a principle reason mounted
compactors significantly outperform rammers,
jumping jacks, walk behind plate compactors and
even much larger self-propelled compactors.
Frequency. Frequency is the number of cycles of the
vibrating mechanism per minute. Each cycle
corresponds to one revolution of an eccentric mass.
Centrifugal force (Impulse force). A high-speed
hydraulic motor rotates an eccentric mass to produce
impulse force. Impulse force is a function of the
dynamic parameters of eccentric moment and
vibrational frequency.
81 = Center of Gravity
82 = Centerline of Rotation to
the Center of Gravity
Impulse force = eccentric moment x frequency
2
x constant
= wr x rpm
2
x .0000284
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