Authors:
Mohamed Haloua,
Abderrahman Iggidr,
Edouard Richard,
Volume: 1, Page 1321 Paper number 1028
Abstract:
In this paper we are interested in the stability properties of a hydraulic
cylinder when no control is applied. We give a nonlinear model that
take into account the leakages and show that the system is Lyapunov
stable.
Authors:
Xavier Brun,
Daniel Thomasset,
Volume: 1, Page 1323 Paper number 9702
Abstract:
The aim of this paper is to propose help for choosing a control strategy
to certain specifications. The system under study is an electropneumatic
actuator. For this, different kinds of linear and nonlinear control
laws have been developed and experimental results have been analysed
and compared in accordance with appropriate benchmarking. Moreover
some new trends are presented. They show the interest of a multi-input
control law in terms of stability and energy consumption due to the
flatness property.
Authors:
Dan Fontaine,
Shengfang Liao,
James Paduano,
Petar V. Kokotović,
Volume: 1, Page 1329 Paper number 2129
Abstract:
A nonlinear control law is designed for a low order model of an axial
flow compressor with a ring of bleed valves after the last compressor
stage. The controller is implemented on a low speed, three stage experimental
compressor. The region of attraction guaranteed by the control law
is experimentally determined and is larger than that of the uncontrolled
compressor.
Authors:
Mazen Alamir,
Volume: 1, Page 1335 Paper number 1211
Abstract:
In this paper, a robust globally asymptotically stabilizing feedback
law is proposed for the control of rotating stall and surge in axial
flow compressors. This is done in two steps. First, a globally asymptotically
stabilizing parameterized feedback is proposed. Then a numerical design
procedure is developed to compute the feedback parameters in accordance
with some pre-specified robustness criterions. Simulations are proposed
to validate the proposed schemes.
Authors:
Jan Tommy Gravdahl,
Frank Willems,
Bram de Jager,
Olav Egeland,
Volume: 1, Page 1341 Paper number 1619
Abstract:
A dynamic model based on the thermo- and fluid-mechanic processes taking
place in a centrifugal compressor is validated. The background for
this is the need for a energy based model including the rotational
speed as a state in order to perform energy based active surge control.
The response of the model is compared with experimental results from
the Energy Technology Laboratory at Eindhoven University of Technology.
Both the calculated compressor characteristic and transient responses
for set point changes and in-surge response were compared to experiment
with good results.
Authors:
Yew-Wen Liang,
Der-Cherng Liaw,
Yung-Chun Wu,
Volume: 1, Page 1347 Paper number 2163
Abstract:
Issues concerning the detection of surge and rotating stall in a compression
system are studied in this paper. It is observed that the plenum pressure
rise and mass flow rate of a compression system exhibit abrupt change
due to the appearance of surge or rotating stall, while those of it's
linearized model do not. With this observation, a linear-based fault
identification filter (FIDF) design technique is proposed to detect
these two instabilities. This is achieved by treating the difference
between the output of the compression system and that of its linearized
model at an unstalled operating point as a fault vector and then investigating
the effect of the fault on the designed FIDF. Simulation results for
Moore and Greitzer's compression model [14] are given to demonstrate
the effectiveness of the proposed scheme. The study may provide a means
of detecting the occurrence of unstable phenomena at the onset so that
a corrective action can be made.
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