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Hydraulic Equipment Noise Reduction for Original Hydraulic Equipment and Retrofitting

| Editor: Dr. Jörg Kempf

Hydraulics specialist R+L Hydraulics GmbH offers a system for reducing hydraulic equipment noise emissions. Consisting of a textile shrouding for hydraulic unit bell housings, the patented NRS system can reduce the total acoustic power output by up to 50 percent i.e. the equivalent of about 10 dB. The NRS system can be fitted without dismantling the hydraulic unit and is a cost-effective solution as original equipment and for retrofitting to existing hydraulic equipment.

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The NRS system from R+L Hydraulics reduces the noise emission level of hydraulic equipment and is available in four widths and three lengths as both original equipment and as a retrofitting kit.
The NRS system from R+L Hydraulics reduces the noise emission level of hydraulic equipment and is available in four widths and three lengths as both original equipment and as a retrofitting kit.
(Picture: R+L Hydraulics)

The pulsation of hydraulic pumps generates very strong vibrations that are not damped sufficiently by the aluminium bell housings commonly used today. Moreover, rigid bell housings do not provide acoustic insulation against structure-borne sound between the electric motor and the hydraulic pump. In unfavourable circumstances the thin-walled aluminium bell housing even acts as a resonance chamber that further increases the oscillation amplitude and thereby amplifies the pump’s running noise.

R+L Hydraulics was involved in a joint project aimed at developing a solution to this problem. The brief was to develop a practical, cost-effective system that could also be retrofitted to existing equipment with poor sound and vibration insulation. In tests, the NRS system — which has now been patented — reduced noise levels by 50 percent or the equivalent of up to 10 dB.

The housing consists of a novel recyclable 3D “high distance” polyester fabric that is tear resistant, resistant against all commercially available hydraulic fluids and temperature resistant from -40°C to +120°C. The NRS system is available in four different widths and three lengths both as original equipment and as a retrofitting kit.

In addition to the NRS system, R+L Hydraulics produces and distributes a comprehensive range of hydraulics accessories, such as heat exchangers, oil-air coolers, offline cooling units, rigid and damped bellhousings, aluminium and steel tanks, power transmission couplings and sintered metal products.

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