Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Adaptive vibration suppression system: An iterative control law for a
  piezoelectric actuator shunted by a negative capacitor   An adaptive system for the suppression of vibration transmission using a
single piezoelectric actuator shunted by a negative capacitance circuit is
presented. It is known that using negative capacitance shunt, the spring
constant of piezoelectric actuator can be controlled to extreme values of zero
or infinity. Since the value of spring constant controls a force transmitted
through an elastic element, it is possible to achieve a reduction of
transmissibility of vibrations through a piezoelectric actuator by reducing its
effective spring constant. The narrow frequency range and broad frequency range
vibration isolation systems are analyzed, modeled, and experimentally
investigated. The problem of high sensitivity of the vibration control system
to varying operational conditions is resolved by applying an adaptive control
to the circuit parameters of the negative capacitor. A control law that is
based on the estimation of the value of effective spring constant of shunted
piezoelectric actuator is presented. An adaptive system, which achieves a
self-adjustment of the negative capacitor parameters is presented. It is shown
that such an arrangement allows a design of a simple electronic system, which,
however, offers a great vibration isolation efficiency in variable vibration
conditions.

12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex