Applied Mathematics and Computation 270 (2015) 648–653
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Applied Mathematics and Computation
journal homepage: www.elsevier.com/locate/amc
Stabilization of an Euler–Bernoulli beam equation via
a corrupted boundary position feedback
✩
Lei Li
∗
, Xinchun Jia, Jiankang Liu
School of Mathematical Sciences, Shanxi University, Taiyuan, Shanxi 030006, People’s Republic of China
article info
Keywords:
Boundary control
Disturbance
Euler–Bernoulli beam equation
abstract
In this paper, we are concerned with the stabilization of an Euler–Bernoulli beam equation
with a constant disturbance on the boundary observation. A dynamic boundary controller is
designed by using only the displacement measurement. We obtain that the resulting closed-
loop system is asymptotically stable. Meanwhile, the estimated function is shown to be con-
vergent to the unknown disturbance as time goes to infinite.
© 2015 Elsevier Inc. All rights reserved.
1. Introduction and motivation
Consider the following Euler–Bernoulli beam equation:
⎧
⎪
⎪
⎪
⎪
⎨
⎪
⎪
⎪
⎪
⎩
u
tt
(x, t) + u
xxxx
(x, t) = 0, x ∈ (0, 1), t > 0,
u
(0, t) = u
x
(0, t) = u
xx
(1, t) = 0, t ≥ 0,
u
xxx
(1, t) = U(t), t ≥ 0,
u
(x, 0) = u
0
(x), u
t
(x, 0) = u
1
(x), x ∈ [0, 1],
Y
(t) = u(1, t) + d,
(1.1)
where and henceforth u
or u
x
denotes the derivative of u with respect to x and
˙
u or u
t
the derivative with respect to t, U(t)isthe
input, Y(t)istheoutput,d is unknown constant disturbance and (u
0
, u
1
) is the initial value.
It is well known that system (1.1) can be stabilized by boundary velocity feedback U
(t) = ku
t
(1, t), k > 0. (see [1]). In [2],
Morgül proposed a finite-dimensional dynamic boundary controller for system (1.1). Although the dynamic boundary controller
can be exploited in solving a variety of control problems, such as disturbance rejection, pole assignment, etc., the velocity mea-
surement is still used for the design of the controller. Since the velocity is relatively difficult to measure directly, and the velocity
transducers tend to be heavy and expensive (see [3, pp. 17–18]), it is very necessary to establish the stabilization of system (1.1)
by using only the displacement measurement. On the other hand, it is also very necessary to establish the stabilization of system
(1.1) in the presence of disturbance, because the disturbance is almost everywhere in real world systems. For the stabilization of
beam equation with disturbance, we refer the reader to [4].
✩
This work was carried out with the support of National Natural Science Foundation of China under Grants (61374059, 61403240); the International S&T
Cooperation Program of Shanxi Province (2013081040); the National Natural Science Foundation of China (61403239); the Scientific and Technological Innovation
Programs of Higher Education Institutions in Shanxi (STIP 2014101); Science Council of Shanxi Province (2015021010).
∗
Corresponding author. Tel: +86-351-7010555, +8613834242751; fax: +86-351-7010979.
E-mail address: 85541978@qq.com (L. Li).
http://dx.doi.org/10.1016/j.amc.2015.08.071
0096-3003/© 2015 Elsevier Inc. All rights reserved.