A systematic procedure for performance assessment and PI/PID controller design based on modified relay feedback test is proposed in this paper. It can estimate the gain and phase margins of unknown systems on-line to indicate the appropriateness of the controller parameters. When the retuning of controller is found necessary, the proposed modified relay feedback scheme can be applied to tune th...

The main purpose of this study is to compare two different feedback controllers for the stabilization of quiet standing in humans, taking into account that the intrinsic ankle stiffness is insufficient and that there is a large delay inducing instability in the feedback loop: 1) a standard linear, continuous-time PD controller and 2) an intermittent PD controller characterized by a switching fu...

The fundamental solution of the system of differential equations in bio-thermoelasticity with dual phase lag (DPL) in case of steady oscillations in terms of elementary function is constructed and basic property is established. The tissue is considered as an isotropic medium and the propagation of plane harmonic waves is studied. The Christoffel equations are obtained and modified with the ther...

A new control approach to achieve robust hopping against perturbations in the sagittal plane is presented in this paper. In perturbed hopping, vertical body alignment has a significant role for stability. Our approach is based on the virtual pendulum concept, recently proposed, based on experimental findings in human and animal locomotion. In this concept, the ground reaction forces are pointed...

CSTR plays a vital role in almost all the chemical industries. Continuous Stirred Tank Reactor (CSTR) is a highly nonlinear process. The CSTR process is analysed for stability conditions by investigating the eigen values. Also Phase plane trajectory is constructed to analyse the CSTR. CSTR exhibits stable and unstable steady state at different regions. Control of CSTR in the complete range is a...

This paper concerns the swing-up control of a two-link robot moving in vertical plane, which has single actuator at second joint and linear torsional spring first joint. First, we present necessary sufficient condition such that is linearly controllable upright equilibrium point (UEP, where two links are both upright). Second, prove without any assumption an provided its actuated angle constant...

The nonlinear air vehicles can be linearized about desired equilibrium points and a linear controller can be designed which stabilizes the aircraft about that equilibrium point. A mission planning is considered as taking the nonlinear system through different equilibrium points. Thus there will be different linear systems for each equilibrium point. To design a controller that drives the system...

Software Defined Networking (SDN) is a new emerging network architecture, which allows, among other things, an efficient convergence between circuit switching and packet switching. However, this convergence imposes a trade-off between control plane load and data plane efficiency: while the SDN controller needs to establish one or more paths (circuits) that can deliver the required bandwidth wit...

Information-centric networking (ICN) separates the identifier and locator of network entities, providing a natural advantage in supporting mobility. To gain ICN to support mobility, an urgent challenge is problem practical implementation with performance optimization. Software-defined (SDN) can be regarded as infrastructure implement However, it difficult for centralized SDN controller quickly ...

We consider the following problem: Given a device, how does it work? How does it accomplish its purpose? In this paper we focus on controllers of dynamic systems. For example, given a controller for a dynamic system, like a crane or a plane, find an explanation of how the controller achieves its goal? We assume that the controlled dynamic system can be observed, either in reality or through sim...