Quality control and noise measurement in Varvel gearboxes

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Thanks to an in-house test department capable of working to key international standards, the Varvel Group offers its customers a variety of gearbox performance test and quality controls.

Noise measurement is one form of test that Varvel can carry out in-house to accurately determine the noise (in decibels) emitted by a gearbox during functioning. Upon customer requests, and for special purposes, the Varvel’s test department can also perform specific measurements, complete with test reports according to standardized, internationally recognized parameters. Varvel’s noise tests are performed according to UNI EN ISO 3746, which uses an enveloping measurement surface over a reflective plane to determine sound power by measuring sound pressure.

Weighted sound power (dB(A)) is determined on the basis of the average sound pressure measured on a surface surrounding the machine, corrected by a specific background noise factor and a factor for environmental reverberation. This type of measurement is often requested by customers in order to verify the noise level of gearboxes used in applications that demand quiet, such as hotels, leisure centres, theatres and public venues.

In addition, Varvel can also measure in-house the vibration generated by a gearbox during functioning. Vibration measurements are an effective means of verifying the correct functioning of a gearbox and the absence of production defects. By measuring and analysing vibration and applying diagnostic techniques, testers can detect gear and bearing defects.

This type of in-house test not only helps to identify and remedy product defects reported in customer claims, but also allows Varvel to continuously improve its entire product range and eliminate the causes of malfunctioning. With a view to minimizing gearbox defectivity, Varvel implements end-of-line quality control procedures based on vibration measurements for all RD Series helical gearboxes, RN Series parallel shaft gearboxes and RO-RV Series bevel helical gearboxes to guarantee the added value of Varvel technology.

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