Control Systems

Stabilization in probability and mean square of controlled stochastic dynamical system with state delay
Although stochastic dynamical systems have received a great deal of attention in terms of stabilization studies, so far there are few works on controlled stochastic dynamical systems with state delay. In this paper, a controlled stochastic dynamical system represented by a stochastic differential equation with state delay is considered. Condition under which the system is exponentially stable i...


Finite-time observers for multi-agent systems without velocity measurements and with input saturations
This paper is devoted to the distributed finite-time observers for multi-agent systems, where the control inputs are required to be bounded and the velocities are assumed to be not available for feedback. An effective framework through defining a class of coordinated saturation functions is introduced, under which both a first-order finite-time observer and a high-order finite-time observer are...
On the existence, uniqueness and nature of Carathéodory and Filippov solutions for bimodal piecewise affine dynamical systems
In this paper, we deal with the well-posedness (in the sense of existence and uniqueness of solutions) and nature of solutions for discontinuous bimodal piecewise affine systems in a differential inclusion setting. First, we show that the conditions guaranteeing uniqueness of Filippov solutions in the context of general differential inclusions are quite restrictive when applied to bimodal piece...


Solvability of indefinite stochastic Riccati equations and linear quadratic optimal control problems
A new approach to study the indefinite stochastic linear quadratic (LQ) optimal control problems, which we called the “equivalent cost functional method”, is introduced by Yu (2013) in the setup of Hamiltonian system. On the other hand, another important issue along this research direction, is the possible state feedback representation of optimal control and the solvability of associated in...
Consequences of thick CCDs on image processing
Astronomers are increasingly using thick (c. 100 micron) CCDs due to their superior red response (e.g. the PanSTARRS, DES, HSC, and LSST cameras). I introduce the signatures of diffusion and both permanent and induced electric fields on the data, and discuss the consequences for the PSF, astrometry, and photometry.


A sub-nanosecond rise time intense electron beam source
This paper presents the design and development of a 75 kV, 55 A, 2 nanosecond duration, ≤ 850 ps rise time, single shot, intense ( ≥ 100 A/cm 2 ) electron beam source and also the measurement technique adopted in sub-nanosecond regime. A 200 kV (nanosecond pulse) coaxial pulse forming line (PFL) based pulser is designed to drive a cold cathode explosive emission electron gun. The electron g...
The TORCH project
TORCH is a DIRC-style detector concept designed for high-precision time-of-flight measurements over large areas. It has been proposed for the upgrade of the LHCb experiment to complement the particle identification capabilities of the RICH detectors, covering the momentum region 1.5–10 GeV/ c for K –π separation. The current status of the detector design and R&D is presented.

Test and simulation of plastic scintillator strips readout by silicon photomultipliers
We studied the light collection in plastic scintillator strips, optimized for the detection of Minimum Ionizing Particles (MIPs). The light is collected by Wave Length Shifter (WLS) fibers and detected by Silicon Photo Multipliers (SiPMs). The study is based on prototypes developed for the muon detector of SuperB experiment. In parallel to measurement made on various type of geometries, a compl...
Ion backflow studies for the ALICE TPC upgrade with GEMs
The ALICE (A Large Ion Collider Experiment at CERN) collaboration plans an upgrade of the detector during the second long shutdown of the LHC, during which the interaction rate will be increased to 50 kHz for Pb-Pb collisions. This demands operation of the Time Projection Chamber (TPC) in an ungated continuous mode. A gating grid can not be used to prevent ions drifting back into the drift volu...

Neural-network-based robot time-varying force control with uncertain manipulator-environment system
This paper considers the problem of time-varying force control for robot manipulators in the presence of uncertainties from both the robotic model and working environment. The position-based impedance control (PBIC) method is employed and in order to achieve accurate time-varying force tracking, an improved PBIC is proposed. A neural-network-based robust controller is proposed to compensate for...
PVTOL maneuvers guided by a high-level nonlinear controller applied to a rotorcraft machine
This work proposes a nonlinear controller, based on the Theory of Lyapunov, to stabilize a quadrotor when accomplishing positioning and trajectory tracking tasks restricted to a vertical plane. The maneuvers here addressed are commonly accomplished by PVTOL (Planar Vertical Take-off and Landing) vehicles, due to the flight constraints: movement restricted to the Z axis or to the XZ/YZ planes. T...

Experimental comparison of backdrivability for time-delayed telerobotics
After stability, transparency is the major goal in teleoperation system design. This transparency goal of the overall system depends on the master/slave manipulator backdrivability. However, time delay in communication channel severely affects the backdrivability of a bilateral teleoperation system in practice. This study investigates the effects of communication delays on the backdrivability o...
Flight envelope protection of aircraft using adaptive neural network and online linearisation
Flight envelope protection algorithm is proposed to improve the safety of an aircraft. Flight envelope protection systems find the control inputs to prevent an aircraft from exceeding structure/aerodynamic limits and maximum control surface deflections. The future values of state variables are predicted using the current states and control inputs based on linearised aircraft model. To apply the...
A simple global asymptotic convergent observer for uncertain mechanical systems
A simple nonlinear observer is proposed for a class of uncertain nonlinear multiple-input–multiple-output mechanical systems whose dynamics are first-order differentiable. The proposed observer is constructed without any detailed model knowledge of the system and the observer gains are easily chosen. Another interesting features of the proposed observer include that it is more immune to noise...
Channel characteristics and coordination in three-echelon dual-channel supply chain
We explore the impact of channel structure on the manufacturer, the distributer, the retailer and the entire supply chain by considering three different channel structures in radiance of with and without coordination. These structures include a traditional retail channel and two manufacturer direct channels with and without consistent pricing. By comparing the performance of the manufacturer, t...