Under the background of dual carbon, retrofitting equipment operation system a refrigeration station and optimization combination its control are significant for efficient energy saving. The single-direction variable flow technology is often used in chilled water stations nowadays. However, cannot achieve both thermal balance chiller system, which unfavorable improving efficiency reliability. To improve reliability equipment, bidirectional primary secondary pumps was presented. Meanwhile,...

Reactions of [Zn(L)(H2O)] precursor and EuCl3 with the aid CO32− ions derived from atmospheric CO2 affording an unusual heteropolynuclear cluster [Zn4L4Eu4(CO3)6]·EtOH. In core cluster, four hetero-binuclear [ZnLEu] units linked by six anions forms a well defined [Zn4Eu4] skeleton good planarity, which plays important role in stabilizing cluster.

This paper explores lane changing trajectory planning and tracking control for intelligent vehicle on curved road. A novel arcs is planned the desired trajectory. kinematic controller a dynamics are designed to implement control. Firstly, model of with non-holonomic constraint established. Secondly, two constraints road in practice (LCCP) proposed. Thirdly, same curvature constructed According geometrical characteristics trajectory, equations state can be calculated. Finally, backstepping...

This article deals with collision-risk-based event-triggered optimal formation control problems for mobile multiagent systems. First, several collision-risk-related definitions, such as collision-free margin, moving direction angle, collision risk and level, are proposed the agents. Then, a collision-risk dependent, time-varying, heterogeneous communication network topology is developed, where agent starts obtaining information of neighboring agents only when risks occur among them. Third,...

The performance of the three-dimensional orthogonal woven composites (3DOWC) under high-velocity impact is studied in a combined experimental and numerical way. velocity ranges from 155 to 1499 m/s. processes are also simulated with mesoscopic point model material method (MPM). results agree well both residual configuration. Four failure patterns observed for perforated specimens. An empirical formula constructed based on results.

The life loss of batteries caused by the daily operation implies a reduction in capital value, which is essential for economic performance storage-containing systems. Most current studies rarely considered it or simplified to be proportional throughput electricity, due its multi-factor dependence and complexity incorporated into dispatch models. This study presents dynamic evaluation model that considers cumulative effect state charge (SOC) changes. First, based on results battery aging...

This paper presents a complete control strategy of the active return-to-center (RTC) for electric power steering (EPS) systems. We first establish mathematical model EPS system and analyze source influence self-aligning torque (SAT). Second, based on feedback signals column wheel angle, we give trigger conditions state switch between assist RTC state. In order to avoid sudden change output driving motor when switches frequently state, design an undisturbed switching logic algorithm....

The trajectory tracking control of wheeled mobile robots is considered. kinematics and dynamics model a robot derived by using the Lagrange's equations. Since values parameters are difficult to determine accurately, physical were assumed be unknown except wheel radius distance between two driving wheels. An integrated controller based on with parameter uncertainty proposed approximation capacity fuzzy system. Simulation results show effectiveness method.

This paper proposes a successive approximation design approach of observer-based optimal tracking controllers for time-delay systems with external disturbances. To solve two-point boundary value problem and time-advance terms obtain the control law, two sequences vector differential equations are constructed first. Second, convergence is proved to guarantee existence uniqueness law. Third, algorithm law presented physically realisable addressed by designing disturbance state observer...

Aiming at the problem of transformer vibration in DC biasing operation, relationship between excitation characteristics and is studied. The electromagnetic coupling state equation operation established. Then, dynamic inductance time‐domain current are calculated based on energy disturbance principle. On this basis, identification method exciting studied to present saturation state. excitation–vibration harmonic response model constructed analyse variation law core under different levels....

To deal with the disturbances of wave and current in heading control Autonomous Underwater Vehicles (AUVs), an optimal rejection (ODRC) approach for AUVs shallow water environment is designed to realize this application. Based on quadratic theory, problem can be expressed as a coupled two‐point boundary value (TPBV) problem. Using recently developed successive approximation approach, TPBV transformed into solving decoupled linear state equation sequence adjoint sequence. By iteratively two...

Adaptive control methods are suitable for offshore steel structures subject to harmful vibrations, as they employ reference models adapt coastal and nearshore physics. To decrease the dependence on accurate characteristics of platform, a compensating measure containing ocean environment is proposed in adaptive scheme. With incomplete states driving input, external loads approximated using wavelet neural network frame. Numerical experiments conducted platform model with varying parameters...

A High temperature superconducting (HTS) double pancake coil for electric machine was fabricated with Bi-2223 tapes. The tested at different by conduction-cooled method. I-V character and variation under charging current studied. curve also calculated an ANSYS program using algorithm which considered the inhomogeneous density distribution inside tape. result fit well one, suggested that prepared.

This paper presents an optimal internal model control (OIMC) algorithm for heading problem of Autonomous Underwater Vehicle (AUV) affected by irregular wave forces. Firstly, the AUV system is proposed, and exosystem forces obtained based on Morison equation. Secondly, disturbances compensator designed using model. And a new augmented constructed, taking in series. Then nonlinear transformed into regulator design system. The OIMC law according to theory quadratic stability degree constraint....

In deepwater-drilling engineering, it is necessary to disconnect the bottom equipment of lower marine-riser package from blowout preventer when encountering multi-hazard environmental factors. order reduce impact recoil on drilling platform after sudden disconnection riser, in this paper, an optimal guaranteed cost H∞ control problem considered for riser. First, a three-element mass-damper-spring riser model subject fluid discharge and heave motion offshore given. Then, controller (OGCHC)...

This paper is concerned with the damping control problem for linear systems sinusoidal disturbances. For disturbances, a state feedback algorithm second-order dynamic characteristics proposed. The law constructed in two parts. First using internal model principle, mode of disturbance embedded controller such that disturbances rejected to zero steady-state error. Then by designing parameters controller, poles closed-loop system can be arbitrarily assigned, so exponential asymptotic stability...

This paper considers the optimal tracking control problem of position and flight trajectory for unmanned aerial vehicles (UAVs). First, nonlinear dynamic model UAV is obtained by Newton's second law. In order to analyze system characteristics design law, reduced a linear variable substitution. Then using total thrust angles as inputs, algorithm controller proposed. Simulation result shows proposed strategy effective easy implement.

A point-based modeling scheme for the mesostructure of a two-step three-dimensional (3D) braided composite is proposed. The yarn path and section profile are more realistic than traditional mesh-based model, influence braiding process on reflected in model. Owing to point feature, discretization matrix very convenient after reinforced structure generated. deformation failure composites can be directly simulated from Several examples, which include calculating macroscopic elastic modulus...