ISSN 1068-798X, Russian Engineering Research, 2017, Vol. 37, No. 7, pp. 615–616. © Allerton Press, Inc., 2017.
Original Russian Text © A.N. Chukarin, A.E. Litvinov, V.V. Novikov, 2017, published in STIN, 2017, No. 2, pp. 11–13.
Reducing the Noise and Operator Injuries Associated
with Circular Saws
A. N. Chukarin
*, A. E. Litvinov
, and V. V. Novikov
Rostov State University of Railroad Transportation, Rostov-on-Don, Russia
Kuban State Technological University, Krasnodar, Russia
Abstract—A new mechanism for use in circular saws not only reduces the operational noise and vibration but
also minimizes operator injuries.
Keywords: circular saws, hard-alloy guides, operator injuries, vibration, noise
Practical measures to reduce the noise level of
machine tools are based on theoretical research into
noise spectra [1–7]. That research is confirmed by
operational measurements, in which the calculated
and experimental octave noise levels are found to be
A system has been developed for reducing the noise
and vibration of circular saws: it consists of additional
saw bearings with vibration-suppressing multilayer
plates introduced in the safety housing, which protects
the operator in the event of saw fracture. This system
reduces the noise intensity of the saw at the source.
The proposed system reduces operator injuries,
lowers noise levels to meet public-health standards,
and also improves cutting precision and quality.
As we see in the Fig. 1, the system consists of a disk
saw 1, protective housing 2, Caprolon plates 3, hard-
alloy plates 4, and springs 5.
The saw equipped with this system operates as fol-
lows. The disk saw, mounted in a protective housing,
is tightly pressed against the two-layer (Caprolon +
hard alloy) plates by the springs. The acoustic pressure
at the source is reduced on account of the excellent
damping properties of Caprolon, which is readily
available, durable, and environmentally safe, absorbs
impact loads, and has a low frictional coefficient. The
hard-alloy plates ensure high wear resistance.
The design of the protective housing makes a great
contribution to the reduction of noise and vibration at
their source (that is, in the tool–workpiece system).
The housing is hollow and filled with a special noise-
absorbing composition. In addition, a special noise-
absorbing coating is applied to its external wall.
By reducing the saw’s acoustic energy at its source,
the levels of noise and vibration will be lowered, and
the cutting precision will be improved.
To ensure that the noise levels meet public-health
standards for the operator, acoustic insulation is pro-
posed. Standard formulas are used in calculation of
the acoustic insulation.
Below the critical frequency, we use the formula
where m is the surface mass of the barrier, kg/m
; w is
the angular frequency, s
; is the angle of incidence
of the sound waves at the internal surface of the bar-
20log 1 ,
Fig. 1. System for reducing noise and vibration levels and
minimizing operator injuries.