To increase the efficiency of hydraulic systems by eliminating valve throttling losses, a direct displacement open circuit is proposed to control a single rod hydraulic actuator. The circuit provides three control inputs, including the displacement of a variable displacement pump, the opening area of a proportional valve, and the position of a directional valve. Pump control has a low bandwidth...

surge is one of the two destructive factors in compressors. surge is the stream instability phenomenon in compressor that imposes severe damages to the compressors. nowadays, suppressingsurge phenomenon is one of the most important issues in oil and gas industries, especially when flow reduction or gas reflux is considered. according to moore-greitzer compressor model, this paper designs an act...

Least costly closed-loop performance diagnosis and plant re-identification A. Mesbaha,∗, X. Bomboisb, M. Forgioneb, H. Hjalmarssonc and P.M.J. Van den Hofd Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA; Laboratoire Ampère UMR CNRS, Ecole Centrale de Lyon, Ecully Cedex, France; The Automatic Control Laboratory, ACCESS Linnaeus Center, School of ...

LINKÖPING Technical reports from the Automatic Control group in Linkk oping are available as UNIX-compressed Postscript les by anonymous ftp at the address ftp.control.isy.liu.se. Abstract We consider the problem of moving the system state between different equilibrium points. For systems whose linearizations are exponentially stable along a curve connecting the given points we show that the tr...

State-of-the-art, uni-processor linear matrix equation solvers for automatic control computations are investigated and compared for various problem sizes. Generalpurpose SLICOT solvers are the most efficient ones for small-size problems, but they cannot compete for larger problems with specialized solvers designed for certain problem classes. Copyright c ©2004 IFAC

In this brief note we provide a new analysis of the transient behavior of the clear-a-fraction policy of Perkins and Kumar. In addition, we show that a new “clear-average-oldest-buffer” policy and a “random part selection” policy (of which “first-come-first-served” is a special case) are stable. Finally, we introduce a stable and efficient “stream modifier” that can be used to obtain network le...

ABSTRACT The pressurized water reactor type power plant has a sophisticated automatic control systems. On the primary side, The Control rod system and the Soluble boron control the core neutron flux. On the secondary side, output steam is controlled by the turbine control valve and steam dump system. During the automatic control mode, the two sides work in a synchronized way so that transition ...

In this study, a nonlinear sliding-mode controller is designed for force tracking of a piezoelectric-hydraulic pump (PHP)-based actuation system, which is developed to replace the current electro-hydraulic actuation systems for automatic transmission (AT) friction elements, such as band brakes or clutches. By utilizing the PHP, one can eliminate the various hydraulic components (oil pump, regul...