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# Control Systems - Science topic

Explore the latest publications in Control Systems, and find Control Systems experts.

Publications related to Control Systems (10,000)

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In this paper, we discuss the approximate controllability for mixed type non-autonomous fractional differential equations. By using the Schauder fixed point theorem and two parameters β-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepac...

Elevator is very important in the real life, and it is considered as an interesting and wonderful means of transportation. This paper designs and implements a prototype of an elevator control system. The mechanical design of this prototype is presented, where the dimensions, sizes, weights, calculations, and analysis of each part are considered. Ba...

The present quality control method of Chinese medicinal materials (CMM) has obvious deficiency, which cannot be compatible with the multi-target and multi-component characteristics and production process of CMM. Plant metabolomics with a huge impetus to comprehensively characterize the metabolites and clarify the complexity and integrity of CMM, ha...

This paper presents the design of a geometric trajectory tracking controller for an underactuated multi-body system describing the cooperative task of two quadrotor UAVs (unmanned aerial vehicles) carrying and transporting a rigid bar, which is attached to the quadrotors via inflexible elastic cables. The elasticity of the cables together with tech...

For the formal verification and design of control systems, abstractions with quantified accuracy are crucial. This is especially the case when considering accurate deviation bounds between a stochastic continuous-state model and its finite (reduced-order) abstraction. In this work, we introduce a coupling compensator to parameterize the set of rele...

Electric vehicles require fast, economical and reliable charging systems for efficient performance. Wireless charging systems remove the hassle to plug in the device to be charged when compared with the conventional wired charging systems. Moreover, wireless charging is considered to be environment and user friendly as the wires and mechanical conn...

Supplementary energy dissipation has extensively proven, through research studies and practical applications, to be a viable strategy for protecting new and existing structures against non-structural and structural damage for low-to-high seismic intensity levels, so avoiding devastating economic and social consequences in the aftermath of an earthq...

Most railways use fixed block technology, which could be replaced with moving block technology with associated high cost. It is therefore interesting to gradually upgrade the signalling system exploiting hybrid technologies. This paper aims to investigate the impact on capacity of various signalling systems (including fixed block technology and hyb...

We introduce two new notions to describe the topological complexity of control systems. We first introduce a notion called entropy point to characterize zero and positive outer invariance entropy systems, then we introduce a notion called metric mean dimension to characterize the growth of infinite outer invariance entropy systems and establish a v...

The present paper shows that the closure of the bounded control set of a linear control system contains all the bounded orbits of the system. As a consequence, we prove that the closure of this control set is the continuous image of the cartesian product of the set of control functions by the central subgroup associated with the drift of the system...

Due to the modularity of modular multilevel converter (MMC), therefore it
has been considered as a substitute for the diode-clamp multilevel inverter in
applications of high-voltage high-power. Where it can obtain any level of
voltage without imposing complexity on the control system. This study
analyses in detail the operation principle and balanc...

Software companies commonly develop and maintain variants of systems, with different feature combinations for different customers. Thus, they must cope with variability in space. Software companies further must cope with variability in time, when updating system variants by revising existing software features. Inevitably, variants evolve orthogonal...

This paper addresses the main goal of using reset control in precision motion control systems, breaking of the well-known “Waterbed effect”. A new architecture for reset elements will be introduced which has a continuous output signal as opposed to conventional reset elements. A steady-state precision study is presented, showing the steady-state pr...

A practical tuning method is proposed via frequency response or even cut-off frequency for active disturbance rejection control (ADRC) of distributed parameter systems (DPSs), whose models are hard to get but frequency characteristics are easy to measure. Moreover, a novel control structure, feedforward compensation ADRC (FC-ADRC), is presented to...

This research uses modelling and simulation tools to investigate a vehicle ethical steering control system (ESCS) for autonomous vehicles (AVs). The ESCS would be activated when unavoidable collisions are detected and an ethical decision in regard to the selection of a collision target needs to be made. The ESCS involves three stages with these bei...

The article is devoted to the topical problem of education and modern society interaction. The theoretical analysis made it possible to determine the trends of modern education in the changing socio-economic conditions. Domestic and foreign researchers consider the process of education and modern society interaction as the development of educationa...

In the present work, a state‐dependent switching controller design approach for controlled systems under control constraints is proposed. First, the controlled system with control gain parameters is converted into a single‐degree‐of‐freedom vibration system by using an invertible transform. Second, based on the physical significance of the single‐d...

Complex time-dependent Lyapunov equation (CTDLE), as an important means of stability analysis of control systems, has been extensively employed in mathematics and engineering application fields. Recursive neural networks (RNNs) have been reported as an effective method for solving CTDLE. In the previous work, zeroing neural networks (ZNNs) have bee...

Migration policies have divided the world in two groups: the walled world of Western countries and the rest. The EU system of migration control is the most extensive, given that Europe is surrounded by a series of regions with high migration potential. Migration restrictions do not enhance and may serve to reduce the opportunities of the worse-off...

Passenger waiting time is a significant issue related to the quality of service of a multiple lift system; however, energy consumption reduction is also an important concern in the lift industry. In this paper, we evaluate different versions of a genetic algorithm (GA) published previously by the authors with several relevant adjustments for the li...

The application of Distraction Osteogenesis (DO) techniques in the reconstruction of skeletal deficiencies is a relatively new topic in the fields of oral and maxillofacial surgeries. In many reconstruction applications, using DO is the preferred technique, as opposed to conventional reconstruction techniques, as there are more advantages and fewer...

Resumen En este estudio se analiza el comportamiento local del flujo en sistemas dinámi-cos lineales no homogéneos que conmutan bajo una banda de histéresis, a través de la teoría cualitativa de los sistemas dinámicos suaves a trozos [1, 2, 3, 4], enél se determina el estado estacionario del sistema para distinta configuración de sus parámetros y c...

The strong coupling effect between the torque system and the suspension system of the single‐winding bearingless switched reluctance motor (SWBSRM) would result in continuous interference to the system and bring difficulties to the design of the control system. Moreover, strong external disturbances will further reduce the stability of the control...

The present study using active vibration control system (AVCS) attempts to actively reduce the airframe vibration responses of
a lift-offset compound helicopter at 250 knots. An 11% scaled airframe structure of the Sikorsky X2 Technology Demonstrator
(TD) is used for the AVCS test and simulation and this small-scale airframe model is designed and m...

En este trabajo se presenta el desarrollo
de un prototipo para el monitoreo de humedad
y el control de la temperatura del
secado del café en la Institución Educativa
Agropecuaria La Capilla (Cajibío, Cauca).
El prototipo fue desarrollado usando instrumentación
electrónica y diseño asistido
por computador. El sistema de control
diseñado permite real...

In this paper, we study the exact boundary controllability of the linear fourth-order Schrödinger equation, with variable physical parameters and clamped boundary conditions on a bounded interval. The control acts on the first spatial derivative at the right endpoint. We prove that this control system is exactly controllable at any time T>0\documen...

Hydraulics is a promising technology for robots. However, traditional hydraulic infrastructures are often large and power-inefficient, with large power sources that hinder mobility. In contrast, electro-hydrostatic actuators are relatively power efficient, but their cost and weight can be excessive in systems with a higher number of degrees of free...

Accurate position signals are essential for a vector control system. To obtain accurate position signals, high‐precision position sensors such as optical encoder and resolver are employed. However, they are usually restricted by the environmental condition and cost. Linear Hall‐effect sensors, possessing tiny size, light weight and low cost, are us...

The current study investigated the role of both involuntary motor activations and voluntary stimulus-response (S-R) mappings (i.e., the subjects voluntarily learned altered S-R mappings) in perception-action processing. Involuntary motor activations were triggered by graspable objects, and voluntary S-R mappings were manipulated by adjusting the pr...

This paper presents an inexpensive, high-performance STM32-based software phase-locked loop (PLL) system suitable for series-resonant inverters (SRIs) with various control methods. The paper shows how to achieve high resolution in setting the voltage-current time-shift with the proposed PLL using the microcontroller of the STM32G4x4 line, and shows...

This paper introduces an anti-slip controller for a quarter vehicle traction control system. By applying the direct Lyapunov method, the single-loop anti-slip control is formulated. However, in the presence of disturbances and parameter uncertainties such as the tire-road interaction and aerodynamic forces, the standard direct Lyapunov method canno...

In computer numerical control systems, linear segments generated by computer-aided manufacturing software are the most widely used toolpath format. Since the linear toolpath is discontinuous at the junction of two adjacent segments, the fluctuations on velocity, acceleration and jerk are inevitable. Local corner smoothing is widely used to address...

Large-scale photovoltaic (PV) generation grid connection causes lack of inertia and insufficient frequency regulation capacity of power system. To solve this problem, this study proposed the active power-frequency droop control (APFDC) and virtual inertia control (VIC) for single-stage PV generation. PV generation is able to participate in the grid...

An online sequential fuzzy dropout scheme is proposed to track the position of robot manipulators in this paper. The scheme is based on the extreme learning machine–inherited sliding-mode control (OSFDELMISMC). In this scheme, an improved extreme learning machine, called the online sequential fuzzy dropout extreme learning machine (OSFDELM), is uti...

In the present work, some generalizations of the boundary crossing theorem and the zero exclusion principle are given for fractional order initialized systems. A new guardian map for the maximal stability interval is proposed as well as its relation with the boundary theorems is established. An extension of the technique for linear time invariant f...

In this article we fully describe the domain of the infinitesimal generator of the optimal state semigroup which arises in the theory of the linear-quadratic problem for a specific class of boundary control systems. This represents an improvement over earlier work of the authors, joint with I. Lasiecka, where a set inclusion was established, but no...

A robot control system is a multivariable, nonlinear automatic control system, as well as a dynamic coupling system. To address the difficult problem of data prediction under a chaotic system, a data-driven physical law learning model (DPM) is proposed, which can learn the underlying physical rules that the data follow. First, two independent autoe...

An execution time estimation model is proposed to accurately estimate the execution time in a robotic assembly workcell. The current study exploits a trajectory generation, which is based on cubic splines in particular, because of their natural characteristics, i.e., joint scalability and computational simplicity. It takes into account task specifi...

This paper studied the sliding mode preview tracking control of one-sided Lipschitz nonlinear discrete-time systems. First, an augmented system including tracking error and preview information is constructed by introducing a difference operator. Then, a sliding surface is designed, and a sufficient condition of asymptotic stability is derived for t...

Investigating the dynamical behavior of a system is an effective method to predict and control its future behavior. Studying the dynamic behavior of a virus can prevent the pathogenicity of a virus and save human lives during the disease epidemic. If the transmission of information from the virus genome to the environment is locked, the pathogenici...

The concept of a fractional derivative is not at all intuitive, starting with not having a clear geometrical interpretation. Many different definitions have appeared, to the point that the need for order has arisen in the field. The diversity of potential applications is even more overwhelming. When modeling a problem, one must think carefully abou...

In this section, initially, I mention that definition of the Laplace transform. After that, calculus of the images [1], Laplace Transforms of the Riemann-Liouville Fractional derivative, Caputo derivative, Grünwald-Letnikov and Miller-Ross Sequential Fractional derivatives [2] are mentioned in our thesis. Since, this definitions have many applicati...

With the increased dependence on the renewable sources in the production of electrical energy; the induction generator get more importance as a basic generation unit in such systems, especially those systems which deals with wind turbine. The main reasons for that usage is the excellent properties of induction generators like low maintains, rigid,...

Microgrid stability issues are classified into three categories: transient, voltage, and small signal stability (SSS). Small variations in the load demand and small perturbations in the control system and line impedance parameters can cause instability, which can be avoided by performing an SSS analysis. This paper focuses on investigating the impa...

Fractional calculus is widely used in biology, control systems, and engineering, so it has been highly valued by scientists. Fractional differential equations are considered an important mathematical model that is widely used in science and technology to describe physical phenomena more accurately in terms of time memory and spatial interactions. T...

In this study, an active overtopping control system [AWOC] that could effectively supress the flooding caused by storm surge was presented, and numerical simulations to verify the overtopping control effect of AWOC were also carried out using OlaFlow, an OpenFoam-based toolbox. In the AWOC, the floating structure that works as the overtopping contr...

We consider the problem of an enhanced evasion for linear discrete-time systems, where there are two conflicting bounded controls and the aim of one of them is to be guaranteed to avoid the trajectory hitting a given target set at a given final time and also at intermediate instants. First we outline a common solution scheme based on the constructi...

Using the technique of generalized inequalities of the Hamilton--Jacobi--Bellman type, we study here the state estimation problem for a control system which operates under conditions of uncertainty and nonlinearity of a special kind, when the dynamic equations describing the studied system simultaneously contain the different forms of nonlinearity...

Nowadays, air conditioning consumes, on average, around one-fifth of the total power used in buildings globally. The present paper aims to provide the present status on the employment of Earth-to-Air Heat eXchangers (EAHX) to contain the consumption of energy and to reduce the effect on the environment in response to the Montreal and Kyoto protocol...

The main objective of this paper is to design a robust multi-objective H_2/H_∞ delayed feedback controller for load frequency control of a multi-area interconnected power system by taking into account all theoretical and practical constraints. To achieve more precise modelling and analysis, the limitation of valve position, governor, and transmissi...

Nonlinear control systems presented as differential inclusions with positional impulse controls are investigated. By such a control we mean some abstract operator with the Dirac function concentrated at each time. Such a control ("running impulse"), as a generalized function, has no meaning and is formalized as a sequence of correcting impulse acti...

Mechanical flight control systems (Cessna used as reference) and hydraulic flight control systems (F-15 used as reference)

In order to solve the application problems in motor automation control, a motor automation control system based on sensor technology is proposed. Sensor technology has been widely used in the field of automation. Therefore, when studying sensor technology, we should also study its specific application in the process of motor automation control. Thi...

This paper presents a novel approach to adapt a behavioral model in order to satisfy a requirement in Hennessy-Milner Logic, including an additional box modality operator, expressing an invariant formula. Control system synthesis, as defined in this way, retains all non-invalidating behavior, and thereby guarantees maximal permissiveness for superv...

This paper proposes a control system for a quadratic boost DC/DC converter in a wide range of operations, based on an inner loop with a sliding mode controller, for reaching a desired equilibrium state, and an outer loop with integral-type controller, for assuring robustness against load and input voltage variations and converter parameter uncertai...

This paper indicates the importance and advantages of the application of hybrid models in the control of water supply systems. A range of possibilities provided by this scientific approach is presented in the practical examples related to the fault diagnostics and fault-tolerant control in the pumping station (PS) control systems. It is presented t...

This article describes the results of comparative analysis of the dynamics of the incidence of pulmonary tuberculosis (TBP), extrapulmonary extrarespiratory tuberculosis (TBER) and respiratory extrapulmonary tuberculosis (TBREP) in St. Petersburg (Leningrad) from 1970 to 2019. Over the 50 years of observation, the incidence of the TBP, especially f...

Future production environments that are part of the drive towards Industry 4.0 require efficient, reliable and scalable shop floor control systems (SFCS). Many promising approaches have been presented over the years with varying degrees of success. One big hurdle in the development of future SFCS is designing a negotiation procedure that is abstrac...

The service-sales interaction should be aligned within and outside the organization, but many companies are not harvesting the benefits of this technique. In line with the conservation of resources (COR) theory, the current research investigates the impact of the salesforce control system on salesforce ambidexterity (service and sales interface), w...

Untethered helical magnetic devices (UHMDs)
have the potential to navigate bodily fluids using permanentmagnet
robotic systems for minimally invasive diagnostic
and surgical procedures. These devices can be actuated by
robotically moving rotating permanent magnets (RPMs) to
achieve controllable steering and propulsion simultaneously
in a wireless m...

Active noise control represents a valid solution whenever it is necessary to attenuate a disturbing noise in the low-frequency range. One example of application is the case of tractors, in which the agricultural operators are exposed for several hours per day to loud low-frequency noise, mainly associated with the harmonic components of the engine...

Lessons from implementing quality control systems in an academic research consortium to improve Good Scientific Practice and reproducibility.

We introduce the concept of "consistently negative feedback" (CNF) in a control system. This is a generalisation of the property of a linear system where the feedback is negative at all frequencies. A number of properties of CNF systems are derived.