In this paper, we explore a novel modeling technique to investigate parafoil flying in wind environments by using computational fluid dynamics. Further, apply an eight-degree-of-freedom dynamic model of the environment based on utilizing revised aerodynamic equations. Given that traditional control methods cannot always tackle trajectory tracking effects properly, propose accurate method active disturbance rejection controller. Semiphysical simulation and airdrop experiments are conducted...

This brief proposes a novel chaotic fractional-order beetle swarm optimization (CFBSO) algorithm that combines chaos concepts and fractional derivative structure with the algorithm. The proposed CFBSO was compared other advanced meta-heuristic algorithms on 23 benchmark functions single-peak, multi-peak, fixed-dimensional multi-peak problems, effectiveness superiority of were verified. then used to optimize parameters active disturbance rejection controller (ADRC). CFBSO-based ADRC further...

Abstract Towing is a widely used mode of transportation in offshore engineering, and towing unpowered platforms particular significance. However, the addition facilities has increased difficulty ship maneuvering. Moreover, marine environment complex changeable, sudden winds or waves can have unpredictable effects on process. Therefore, it great significance to overcome influence harsh while navigating system following planned course target sea area. To tackle time‐varying disturbances,...

Summary For achieving the accurate trajectory tracking of flexible wing unmanned aerial vehicle in complicated missions, especially vertical component, a feedforward compensation unit–based active disturbance rejection control (ADRC) is proposed. In ADRC, internal dynamics and influence total will be estimated dynamically compensated by extended state observer (ESO). It puts very high request on observation ability ESO with unpredictable external disturbance, complex coupling influence,...

Parafoil delivery systems play an irreplaceable role in the area of airdrop supply and aircraft recovery. Their main function is to transport payload target position. The system applies a large flexible parafoil provide lift force control flight direction. strongly nonlinear vulnerable wind disturbance. To solve this problem, study, we explore novel modeling method homing methodology for parafoil. First, 8-degree-of-freedom dynamic model built. By clarifying functions different aerodynamic...

To ensure the safe operation of an interconnected power system, it is necessary to maintain stability frequency and tie-line exchanged power. This one hottest issues in system field usually called load control. overcome influences disturbances on multi-source systems containing thermal plants, hydropower gas turbine we design a linear active disturbance rejection control (LADRC) based bias mode. For LADRC, parameter selection controller directly affects response performance entire not...

Load frequency control (LFC) is necessary to guarantee the safe operation of power systems. Aiming at and stability problems caused by load disturbances in interconnected systems, active disturbance rejection (ADRC) was designed. There are eight parameters that need be adjusted for an ADRC, which challenging adjust manually, thus limiting development this approach industrial applications. Regardless theory or application, there still no unified efficient parameter optimization method. The...

Parachute design is challenging to achieve innovative progress if the dominant role of testing continues, as it will be an increasingly expensive and time-consuming work. The aim this study establish a reliable efficient tool using existing advanced numerical modeling methods. This paper presents method based on two-way coupled fluid-structure interaction (FSI) strategies for predicting aerodynamic flight performance parafoil optimization. nonlinear finite element was used canopy fabric...

Electric vertical takeoff and landing (eVTOL) vehicles possess high payload transportation capabilities compact design features. The traditional method of increasing propeller size to cope with is no longer applicable. Therefore, this study proposes the use coaxial counter-rotating propellers as lift system for eVTOL vehicles, consisting two coaxially mounted, bi-blade propellers. However, if a single rotating linearly increased without considering loss caused by downwash airflow generated...

A parafoil delivery system has usually been used in the fields of military and civilian airdrop supply aircraft recovery recent years. However, since altitude unpowered is monotonically decreasing, it limited by initial flight altitude. Thus, combining multiple constraints, such as ground obstacle avoidance time, puts forward a more stringent standard for real-time performance trajectory planning system. to enhance performance, we propose new method based on an improved twin delayed deep...

When the Pump-turbine operates in S-shaped curve, difficulty loading rejection process and unusual increase water pressure will occur, which is caused by machine vibration. Misaligned Guide Vanes(MGV) can improve stability of pump-turbine no-load condition. In order to explore feasible effective way pre-opening guide vanes, four kinds programs are given for full three-dimensional numerical simulation flow analysis model test then should be performed optimal model. From CFD calculations...

Accurate calculation of canopy aerodynamic parameters is a prerequisite for precise modeling parafoil airdrop system. This investigation analyses the performance in testing combining leading-edge incision and trailing-edge deflection. Aerodynamic are obtained using computational fluid dynamic simulations, then, output data used to estimate deflection factors. The estimated lift drag coefficients instead traditional based on lifting-line theory incorporated into eight degrees freedom model an...

In this article, the proposed method first evaluates effects on aerodynamic force caused by flight velocity and angular of parafoil delivery system performs an active disturbance rejection control in horizontal direction. Moreover, a glide-ratio controller is designed based characteristics symmetrical flap deflection. For resisting its disturbance, feedforward compensation unit with controller. The performance effectively validated through hardware-in-the-loop simulation.