Page 33 - PM#102_all

Excessive Noise Levels Shrouding and dampening of materials have been
successfully implemented by many manufactures and
Hydraulic drives and controls are characterized by is an effective approach but usually at a premium cost.
extremely high levels of force which is measured against Even by selecting low-noise components and carrying out
the volume and weight of the components. Where large preventative design and installation measures, the desired
amounts of power are converted in a small area, the result or required levels still may not be attained and may still
can be high and damaging sound levels. Hydraulic system exceed regulatory limits.
noise and leakage are still two of the most fundamental
problems for modern hydraulic systems. Primary and secondary sound protection measures can
be eliminated if a separate hydraulic pit or the hydraulic
Though many manufactures have come up with solutions, power unit is in a separate room from human operations.
providing a simple cost effective resolution has still been
an issue in the industry. Many hydraulic systems still exert Nowadays, noise pollution can be reduced or eliminated
above 85 dBA which is the manufacturing factory average by new and innovative engineering solutions which can
sound level of machines. Systems & machines running customize power units and aid with installations that
above 85 dBA continuously for 8 hours or more exceed effectively reduce noise in manufacturing plants. Selecting
exposure limits for humans and could have long lasting the right components in the early planning stages will assist
consequences to anyone in contact. in noise reduction and identify cost-effective solutions. The
reduction of noise can bring many benefits to a company.
Noise Protection Measures Not only are there state and national standards to comply
with, the morale, health and wellbeing of employees will
There are two forms of noise protection measures: Primary see employees that are willing to work harder for your
& Secondary. company.

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Primary noise protection is more cost-effective, addresses Zelaschi_PM#102.pdf 1 10/25/2559 BE 11:57 61
the sources of the sound and incorporates all measures
used to reduce the sound emissions or sound generation.
The right component selection, such as internal gear
pumps, is the first step towards noise reduction. The
additional investment becomes relative considering the
overall costs where actions taken to improve a completed
setup is a more expensive exercise. For example, when
selecting pumps, noise radiation should be taken into
consideration along with the usual criteria of pressure,
flow and fixed or variable displacement. An estimate of
the emissions from the hydraulic system can be made for
pumps from the values obtained in the sound chamber.
Other examples would be the use of elastic pump mounts
or assembly block construction which are preferable to
C
assembly wall (front panel) construction. The use of
M
control blocks makes the entire system stiffer, less prone
Y
to vibration and keeps dimensions of radiating surfaces
small. CM
MY
Secondary noise protection considers reducing the radiation
CY
and conduction of sound energy. Barriers, absorption
materials or enclosures around hydraulic systems are used
CMY
when low-noise components are insufficient to achieve ENQUIRY NO. 102 666
K
desired results. There is considerable potential for noise
reduction in the area of secondary measures. However,
the extra efforts required in planning, design, assembly
and testing does entail corresponding expenses.

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