Equilibrium stability analysis by numerical simulations for a linear system with time-delayed control
Journal Title: INCAS BULLETIN - Year 2019, Vol 11, Issue 2
Abstract
The work starts from the linearization of a nonlinear mathematical model of the electrohydraulic servomechanism with structural switching and delayed control. The delay, as well as the switching structure, can lead to instability and to the deterioration of the dynamic system performance. Between the different approaches to the delay problem, this article considers the predictive feedback method. The question of switching structure is herein treated empirically, aiming in the numerical simulation not to impose on the system a magnitude of the disturbance of the zero equilibrium that leads to switching by changing the sign of the state variable which is the displacement of the servovalve spool. Numerical simulations allow to highlight a critical delay, which is attested by comparison to an analytical method.
Authors and Affiliations
George TECUCEANU, Daniela ENCIU, Ioan URSU
Global Optimized Shapes of Flying Configurations Compared with Those of Gliding Birds
The determination of global optimized (GO) shape of a flying configuration (FC) (namely, the simultaneous optimization of its camber, twist and thickness distributions and also of the similarity parameters of its planfor...
ELIE CARAFOLI – PROFESSOR, ENTREPRENEUR and PATRIOT SCIENTIST
Wind Tunnel Testing of Passive High-Lift Systems
This paper presents experimental results obtained with passive high lift systems using a combination of smart flap kinematics and vortex generators. A mid-scale 2.5D wind tunnel model based on DLR-F15 is tested in INCAS...
Aerodynamic study of a small horizontal-axis wind turbine
The wind energy is deemed as one of the most durable energetic variants of the future because the wind resources are immense. Furthermore, one predicts that the small wind turbine will play a vital role in the urban envi...
Issues of Paradigmatic Nature of the Turbulence Origin
The fluid such as deformable continuum, without own shape its motion, must be guided by some physical surfaces/boundaries, which are subjected to an action from fluid under the form of the wall pressure, equal to the rea...