Instrumentation & Measurement Magazine 25-2 - 41

Fig. 4. Schematic diagram of piezoelectric actuator and inertial-type electromagnetic actuator.
systems have developed
rapidly in China, where domestic
manufacturers such
as ECON, DONGLING
have gradually occupied
some global markets. The
ES series water-cooled electro-dynamic
vibration test
system from DONGLING
can meet the vibration test
requirements of various
types of products, in which
the exciting force range is
25 to 600 kN, maximum
load is 300 to15000 kg, and
maximum frequency is up
to 2800 Hz. The HVS series
servo-hydraulic vibration
test system from ECON has
a force range from a few
tons to hundreds of tons,
a frequency range of 0.1 to
400 Hz and a maximum
displacement of ±200 mm.
In addition, there are some
series of resonant inertial actuators produced by MOTRAN
have total weight of 4.84 kg, resonant frequency of 114 Hz, output
force of 1334 N at the working frequency and maximum
power consumption of 66 W. In China, the industry of electromagnetic
actuators has also been developed for decades. The
representative Chinese electromagnetic actuator manufacturers
are FUNENG and DONGLING. The inertial actuators
produced by Chinese manufacturers have total weight from
0.8 to 250 kg, working frequency from 10 to 350 Hz, and output
force from 50 to 3500 N.
Application Domain
AVC in Vibration Test
Vibration test is also called Environmental vibration test,
which simulates the vibration environment of the products in
laboratory. It plays an important role in life estimating of products
and discovers weaknesses during the design of products.
This technology has been widely applied in fields such as aerospace,
vehicles, and electronics. The results of vibration testing
can help designers to optimize and improve the vibration resistance
of products in the process of production, packaging,
transportation and service. For example, in the field of aviation,
it is necessary to determine whether the vibration of
spacecraft during transportation will cause damage to equipment
and passengers.
A vibration test system is essentially an AVC system. The
world-famous brands of vibration test system mainly include
LDS (UK), IMV (Japan), DP (USA), and HUTCHINSON
(France) who supply large tonnage shakers and high-performance
vibration controller.s In recent years, vibration test
April 2022
non-standard vibration test systems. For example, a biaxial
vibration test platform specialized for high-speed railway
switch machinery was developed by Xi'an Jiaotong University
(XJTU) and ECON (Fig. 5). Based on this platform, an
active control system has been developed to simulate the random
and impact vibration of the switch machine in horizontal
and vertical directions during operation, which provides significant
feedback to the design process of this product in
laboratory to improve its reliability.
AVC in Civil Engineering
AVC technology is quite popular in civil engineering. In this
field, there are mainly three types of mechanisms for AVC.
They are active tendon mechanisms (ATM), active tendon
mass damper mechanisms (ATMDM), and active aerodynamic
appendage mechanisms (AAAM). Active Mass Driver
(AMD) based on ATMDM is very commonly applied in civil
engineering. In 1989, the first AMD system was installed on
the Kyobashi Seiwa building in Tokyo, Japan, to reduce the
vibration caused by earthquakes and strong winds. The effectiveness
of AMD has been confirmed by observation records
and simulation. Since then, many engineering structures began
to apply AVC technology.
In China, active structural vibration control was first proposed
by Prof. Yao Zhiping in the early 1970s. After nearly
50 years of exploration and research, China has made a great
breakthrough in this field. Aiqun Li et al. from Southeast University
(SEU) first used the active-passive hybrid control
method combining tuned liquid damper (TLD) and AMD to
suppress the wind vibration of Nanjing TV Tower in the 1990s
(Fig. 6), which achieves a good control effect [11]. Weilian Qu
IEEE Instrumentation & Measurement Magazine
41

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