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PubMed Journal Database | ISA transactions RSS

16:33 EDT 24th August 2019 | BioPortfolio

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Showing PubMed Articles 1–25 of 112 from ISA transactions

APD optimal bias voltage compensation method based on machine learning.

The signal-to-noise ratio (SNR) of avalanche photodiode (APD) in optical detection system is greatly influenced by background radiation and operating temperature, so an APD optimal bias voltage compensation method based on machine learning is designed to accurately judge the current laser emission state and APD working state so that dichotomy compensation can be carried out to make APD work in optimal state. By means of cross-verification, the accuracy of judging laser emission state and APD working state i...

Internet of Things based real-time electric vehicle load forecasting and charging station recommendation.

Electric vehicles (EVs) are emerging as a favorable strategy to meet the increasing environmental concerns and energy insufficiency, and this trend is expected to grow in the near future. However, the inadequate charging infrastructure is becoming a major barrier to the wide acceptance of EVs. Deployment of this infrastructure is expected to maximize the adoption of EVs to facilitate users' range anxiety. Therefore, connectivity between the charging stations (CS) is mandatory. Understanding the real-time st...

Adaptive super-twisting sliding mode observer based robust backstepping sensorless speed control for IPMSM.

This paper proposes a higher-order sliding mode observer based robust backstepping control to realize high-performance sensorless speed regulation for the interior permanent magnet synchronous motor (IPMSM). A new robust adaptive super-twisting higher-order sliding mode based observer is proposed to estimate the rotor position. The proposed observer has advantages of sliding chattering reduction and robustness against uncertainties. And, a new robust integral adaptive backstepping control with sliding mode ...

State of charge estimation of vanadium redox battery based on improved extended Kalman filter.

The accurate state of charge (SOC) estimation can protect the battery from overcharging and over-discharging, and it is useful to make an effective dispatching strategy. The extended Kalman filter (EKF) method is used to estimate SOC widely. But it does not consider the SOC constraints. Moreover, the convergence is influenced by the uncertain initial SOC, which may lead to false alarm, unwanted operation of protection, error dispatching and poor robustness of the system. This paper presents an improved exte...

Uncalibrated dynamic visual servoing via multivariate adaptive regression splines and improved incremental extreme learning machine.

In classical image-based visual servo (IBVS) control systems, image Jacobian matrix estimation depends on target-depth information. To address this concern, the proposed study describes use of a novel control-system approach, wherein multivariate adaptive regression splines (MARS) are first used to select important features of a dataset to reduce training-sample size. Subsequently, a hybrid algorithm introduces random reduced kernel regularization (RKR) parameters based on the use of an incremental extreme ...

Disturbance suppression for quadrotor UAV using sliding-mode-observer-based equivalent-input-disturbance approach.

This paper presents a new control scheme for quadrotor unmanned aerial vehicle attitude control and disturbance suppression. A quadrotor dynamic model is divided into two subsystems: fully-actuated and under-actuated. While the PID method is used to control the fully-actuated subsystem, a sliding-mode-observer-based equivalent-input-disturbance approach is used to control the under-actuated subsystem. The system design is simple, and it is globally uniformly ultimately bounded. Simulations and comparisons d...

Non-dominated solution set based on time-frequency infograms for local damage detection of rotating machines.

The determination of an index to balance the impulsiveness and cyclostationarity of an expected component is an interesting research topic in mechanical health monitoring. Many proposed indices focus on evaluating the impulsiveness or cyclostationarity of an analyzed signal, thus resulting that an expected component cannot dominate other modes using these indices under the interferential circumstance of occasional shocks and harmonic signals. Moreover, several parameters have to be determined in advance, th...

Sampled-data control for linear time-delay distributed parameter systems.

Some real systems have spatiotemporal dynamics and are time-delay distributed parameter systems (DPSs). The existence of time-delay may lead to system instability. The analysis and design of DPSs with time-delay is essentially more complicated. To take into account the factor of time-delay and fully enjoy the benefits of the digital technology in control engineering, it is a theoretical and practical value to consider the sampled-data control (SDC) problem of DPSs with time-delay. However, there are few att...

Semi-global stabilization of discrete-time linear systems with unsymmetrical saturation.

This paper deals with the stabilization problem for discrete-time linear system with unsymmetric saturation. To handle the structural properties of the unsymmetric saturation nonlinearity, the description of the transformation carries from the symmetric case to the unsymmetric case is employed. By using the parametric Lyapunov equation-based low gain feedback design approach, linear matrix inequality formulations for the state feedback and output feedback control design are given. The effectiveness of the p...

Stable force control and contact transition of a single link flexible robot using a fractional-order controller.

The control of robots that interact with the environment is an open area of research. Two applications that benefit from this study are: the control of the force exerted by a robot on an object, which allows the robot to perform complex tasks like assembly operations, and the control of collisions, which allows the robot safely collaborate with humans. Robot control is difficult in these cases because: (1) bouncing between free and constrained motion appears that may cause instability, (2) switching between...

Command filter based adaptive control of asymmetric output-constrained switched stochastic nonlinear systems.

In this paper, adaptive tracking control problem is investigated for a class of switched stochastic nonlinear systems with an asymmetric output constraint. By introducing a nonlinear mapping (NM), the asymmetric output-constrained switched stochastic system is first transformed into a new system without any constraint, which achieves the equivalent control objective. The command filter technique is employed to handle the "explosion of complexity" in traditional backstepping design, and neural networks (NNs)...

Robust optimal predictive control of heavy haul train under imperfect communication.

With the rapid developments in communication technology, the bidirectional wireless communication channel is widely used to exchange information between the train and wayside control center. As an emerging technology, the communication based heavy haul train control (CBHHTC) system is becoming a better alternative for administrative department to provide the greater transport capacity. In order to put the latest automatic control methods into the practice, this paper investigates the robust optimal control ...

An improved complementary ensemble empirical mode decomposition with adaptive noise and its application to rolling element bearing fault diagnosis.

A novel time-frequency analysis method called complementary complete ensemble empirical mode decomposition (EEMD) with adaptive noise (CCEEMDAN) is proposed to analyze nonstationary vibration signals. CCEEMDAN combines the advantages of improved EEMD with adaptive noise and complementary EEMD, and it improves decomposition performance by reducing reconstruction error and mitigating the effect of mode mixing. However, because white noise mixed in with the raw vibration signal covers the whole frequency bandw...

Avoiding obstacles in cooperative load transportation.

This work deals with load transportation by quadrotors, when the load is attached to the vehicles through flexible cables. More specifically, two quadrotors are used to carry a single load, which is attached to both vehicles, through such kind of cables. The idea of using two quadrotors working cooperatively to carry the load is adopted to suppress any load oscillation in the direction of movement, what would happen if just one UAV were used. As a consequence of using two UAVs (or more than two) it can happ...

Analytical fractional PID controller design based on Bode's ideal transfer function plus time delay.

In this paper, a fractional order PID controller cascaded with a fractional filter is proposed for higher order processes. In this analytical design methodology, one or two reduced fractional orders plus time delay models are used to represent higher order system transfer functions. The controller parameters are determined so as to meet certain frequency domain specifications. A unity feedback reference model is employed where Bode's ideal loop transfer function plus time delay of the fractional order model...

Chance-constrained optimization for nonconvex programs using scenario-based methods.

This paper presents a scenario-based method to solve the chance-constrained optimization for the nonconvex program. The sample complexity is first developed to guarantee the probabilistic feasibility. Then through the sampling on uncertain parameters, many scenarios are generated to form a large-scale deterministic approximation for the original chance-constrained program. Solving the resulting scenario-based nonconvex optimization is usually time-consuming. To overcome this challenge, we propose a sequenti...

Optimal power allocation for multiple DoS attackers in wireless networked control systems.

In this paper, an optimal power allocation strategy for multiple denial-of-service attackers is investigated in a wireless networked control system with stochastic disturbances. In the presence of denial-of-service attackers, effective signals sent by a transmitter are interfered with causing degradation of signal-to-interference-plus-noise ratio and even packet loss. The effect of multiple attacks on the wireless networked control system is maximized by cooperative game. An H minimax controller is also des...

A class of cooperative relay analysis of multi-agent systems with tracking number switching and time delays.

This paper investigates a complicated class of cooperative tracking problems with time-varying number of tracking agents and communication time delays. During the entire tracking process, tracking agents are dynamically changing and the number is not fixed. This results in jumping of tracking errors and dynamic dimensions of the corresponding Laplacian matrices. Consequently, the stability analysis turns to be difficult especially when the effect of communication time delays is taken into consideration. In ...

The Coriolis mass flow meter as a volume meter for the custody transfer in liquid hydrocarbons logistics.

In recent years, the Coriolis mass flow meters (CMF), devices based on the Coriolis effect over a vibrating pipe, have developed better metrological performance and they are now a reasonable alternative for the custody transfer measurements. Nowadays, many custody transfer operations require measurement of the net volume (volume measured at a certain reference temperature) and, therefore, it is not feasible to use the CMF as a mass flow meter. However, the actual CMF can be used as net volume meters because...

Proportional myoelectric and compensating control of a cable-conduit mechanism-driven upper limb exoskeleton.

Recent studies have indicated that human motion recognition based on surface electromyography (sEMG) is a reliable and natural method for achieving motion intention. However, achieving accurate estimates of intended motion using a low computational cost is the main challenge in this scenario. In this study, a proportional myoelectric and compensating control method for estimating and assisting human motion intention with a cable-conduit mechanism-driven upper limb exoskeleton was proposed. The integral sign...

Distributed adaptive containment control of uncertain QUAV multiagents with time-varying payloads and multiple variable constraints.

This paper considers the containment control problem for uncertain QUAV (Quadrotor Unmanned Aerial Vehicle) multiagents with time-varying payloads under a fixed topology graph, and a distributed adaptive containment control protocol with multiple variable constraints is proposed. Generally, the control framework is classified into two layers. In the first layer, the desired trajectories are determined for followers by the communication topology and initial values of leaders. For the second layer, the ith QU...

Dynamic output feedback H control for 2D fuzzy systems.

In this paper, the dynamic output feedback H control problem is considered for two-dimensional discrete fuzzy systems described by the second Fornasini-Marchesini state-space model. By introducing novel slacked matrices, sufficient criteria are established to guarantee an H noise attenuation of the resulting closed-loop system. Then the proposed output feedback H controller design method is applied to one-dimensional discrete-time fuzzy systems. It is worth mentioning that there is no rank constraints to sy...

Linear estimation for discrete-time periodic systems with unknown measurement input and missing measurements.

This paper considers the estimation problem for periodic systems with unknown measurement input and missing measurements. The missing measurements phenomenon is described by an independent and identically distributed Bernoulli process. The quality of the estimation achieved by an admissible filter is measured by a performance criterion described by the Cesaro limit of the mean square of the deviation between the remote signal and the estimated signal. By employing the minimum variance unbiased estimation te...

Design and experimental realization of a robust decentralized PI controller for a coupled tank system.

This paper presents design and realization of a robust decentralized PI controller for regulating the level of a coupled tank system. The proposed controller is designed based on a predefined reference transfer function model in which we adopt a frequency matching of actual and reference models. Realization of control algorithms for a multivariable system is often complicated owing to uncertainties in the process dynamics. In this paper, initially a frequency response fitting model reduction technique is ad...

Sensor scheduling for relay-assisted wireless control systems with limited power resources.

In this paper, we investigate the transmission scheduling problem for wireless control systems (WCSs) with limited power resources. Different from the existing works, for a discrete-time linear process, we consider a more practical WCS, where a relay is introduced into the framework for remote transmission and control. To achieve the best control performance of the system, we propose a global optimal offline scheduling algorithm. Then, based on ACK-feedback framework, two different online scheduling schemes...


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