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
Keywords
Related Articles
- EP ID EP585304
- DOI 10.13111/2066-8201.2019.11.2.15
- Views 75
- Downloads 0
Unified formulation for URANS and LES in DxUNSp code
The aim of this work is to find a unified and efficient implementation of a LES turbulence model in an existing URANS CFD code, initially based on unsteady RANS equations with a k-ε turbulence model. This code has the ca...
Air quality assessment based on road traffic pollutants dispersion modelling: Giurgiu – Ruse Bridge Case study
The paper presents a case study related to air quality assessment along an important high traffic bridge (Giurgiu - Ruse), by dispersion modelling of the main pollutants. In order to estimate the level of pollution cause...
Computing Method of Forces on Rivet
This article aims to provide a quick methodology of forces calculation on rivet in single shear using the finite element method (FEM) – NASTRAN/PATRAN. These forces can be used for the calculus of bearing, inter rivet bu...
Nanocomposites as Advanced Materials for Aerospace Industry
Polymer nanocomposites, consisting of nanoparticles dispersed in polymer matrix, have gained interest due to the attractive properties of nanostructured fillers, as carbon nanotubes and layered silicates. Low volume addi...
Constant-Power Engines in Flights to L[sub]4[/sub] point of the Earth-Moon System
The transfer is studied in the context of the classical Circular Restricted Three-Body Problem. The initial state is on a geosinchronous orbit and the terminal state is the L4 triangular Lagrangian point. The use of cont...