ISSN 1068-798X, Russian Engineering Research, 2018, Vol. 38, No. 2, pp. 86–90. © Allerton Press, Inc., 2018.
Original Russian Text © Yu.S. Sergeev, S.V. Sergeev, A.A. D’yakonov, A.V. Kononistov, G.E. Karpov, A.A. Mikryukov, 2017, published in Vestnik Mashinostroeniya, 2017, No. 11,
Automated Monitoring System
for Self-Synchronizing Vibrational Drives
Yu. S. Sergeev*, S. V. Sergeev, A. A. D’yakonov, A. V. Kononistov,
G. E. Karpov, and A. A. Mikryukov
South Ural State University, Chelyabinsk, Russia
Abstract—An automated monitoring system has been designed to maintain stable operation of self-synchro-
nizing vibrational drives. By means of the system, information is collected and automatically processed.
A built-in electrical feedback loop ensures synchronous drive operation.
Keywords: self-synchronizing systems, vibrational drives, automation, monitoring systems, synchronous
In vibrational mechanics, the synchronization of
electromagnetic systems must be maintained [1, 2].
The option of most interest is parametric control of
the self-synchronizing rotary and vibrational motion
of electromechanical components, so as to ensure the
synchronization, for example, of two rotary electric
drives on a common base. As shown by extensive
research, the synchronization of rotary motion is gen-
erally based on electrical methods or on feedback
[3‒5]. Another approach is to use switches with f lexi-
ble logic . Self-synchronizing systems may include
relatively complex components whose rotation gener-
ates various vibrations: for example, yoked electrovi-
brational drives based on switched-induction motors
; and multiply imbalanced [1, 2], multirotor [8, 9],
or imbalanced rotary inertial vibrational drives .
Many self-synchronizing systems have yet to be
adequately studied and so cannot be effectively con-
trolled. Examples include self-synchronization in the
operation of a group of multiblade metal-working
tools (bits, countersinks, reamers, mills, etc.)  or in
situations where the rotation of transverse and longi-
tudinal vibrations undergoes self-synchronization in
the course of machining . Similar behavior is
observed in the drilling of boreholes by multiblade
cutting and chipping tools .
In self-synchronization, each object generates a
particular vibration at specific frequency but, once
combined into a system, they collectively generate a
vibration with the same frequency or vibrations with
related frequencies n
, …, n
the synchronous frequency, while n
, …, n
Note that, even if their coupling is weak, the
objects generating vibrations with different frequen-
cies are self-synchronized to such a degree that remov-
ing one of them does not disrupt the overall effect .
In order to control the self-synchronization of sys-
tems, automated monitoring of their parameters is
required. Today, numerous vibrational monitoring
systems based on different effects are available. Each
one has particular advantages and disadvantages. Cer-
tain difficulties arise in the theoretical analysis and
simulation of such systems. Two groups of measuring
methods for vibrational parameters are known:
(1) contact methods, in which the sensor is mechani-
cally coupled to the object being monitored; (2) con-
tactless methods, without such mechanical coupling.
In the first case, vibrations with low frequency and rel-
atively large amplitude are measured with high accu-
racy—for example, by means of piezoelectric sensors.
However, the high inertia distorts the form of the sig-
nals, and hence it is not possible to measure vibrations
with high frequency and small amplitude, especially in
the case of self-synchronizing vibrational drives.
With small vibrational amplitude, the displacement
is recorded by an amplitude method: the open-reso-
nator method. The change in output power is mea-
sured in the case of pass-through switching, while the
reflected power is measured in the case of window
switching [3, 4]. That entails constant power to the
resonator and high stability of the exciting frequency.
In the second group of methods, acoustic and elec-
tromagnetic waves are used. An example is ultrasound
phase measurement, in which the phase difference of
an ultrasonic reference signal and the signal reflected