Brushless doubly fed induction generators (BDFIGs) are promising alternatives to due high reliability and low maintenance cost for the absence of brushes slip rings. As a typical application in offshore wind energy generation, feedforward method is applied grid-voltage oriented vector control make active reactive power decoupled. Another challenge practice how meet demanding requirements grid codes. The dynamic behavior BDFIG analyzed detail under unbalanced conditions with proposal four...

To improve the performance and integration of power train electric vehicles power, a dual three-phase permanent magnet synchronous machine (PMSM) drive is investigated to achieve hybrid energy storage system management. Two sets motor windings are connected with ultracapacitors battery, respectively, through inverters. First, operation modes integrated studied by modeling vector diagram analysis. A new control scheme then established enhance regulation for unbalanced winding distribution....

Abstract Hydrogel actuators have shown great promise in underwater robotic applications as they can generate controllable shape transformations upon stimulation due to their ability absorb and release water reversibly. Herein, a photoresponsive anisotropic hydrogel actuator is developed from poly(N‐isopropylacrylamide) (PNIPAM) gold‐decorated carbon nitride (Au/g‐C 3 N 4 ) nanoparticles. Carbon nanoparticles endow with photocatalytic properties, while reorientation mobility driven by the...

In this paper, a miniature electric field probe with an ultrawideband of 9 kHz-20 GHz is proposed, fabricated, and tested. The fabricated on four-layer printed circuit board using high-performance low-loss Rogers material (ε <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> = 3.48 tanδ 0.0037). Coax-thru-hole via array used to control the signal impedance achieve 50 Ω match over whole working band, reducing harmful influence probe's...

This paper proposed a simple strategy for parameters identification of switched reluctance motor (SRM) direct instantaneous torque control. without rotor locking includes measuring and calculating steps. In the step, flux linkage curves with current at three critical positions are obtained. At intermediate position, curve is measured under chopper control (CCC). aligned unaligned when winding given voltage pulse. whole flux-linkage characteristics position can be calculated based on curves....

In this paper, a hierarchical and robust framework for learning bipedal locomotion is presented successfully implemented on the 3D biped robot Digit built by Agility Robotics. We propose cascade-structure controller that combines process with intuitive feedback regulations. This design allows to realize stable walking reduced-dimensional state action spaces of policy, significantly simplifying increasing sampling efficiency method. The inclusion regulation into improves robustness learned...

Abstract The interface properties between surface grown carbon nanotubes fiber (CNTs‐CF) and epoxy resin were investigated by different modification methods. X‐ray photoelectron spectrometer probations show that the pristine CNTs‐CF has very low contents of both oxygen element active element. Taking naked (CF) without CNTs as a reference, interfacial shear strength (IFSS) CNTs‐CF/epoxy is only 5.6% higher. After heat treatment, chemical sizing treatments, activity improved considerably. In...

In high-voltage dc power systems of advanced aircraft, most the electrical motor drives and electronic converters behave as constant loads (CPLs) when tightly regulated usually cause negative impedance instability problems. This paper presents stability criteria for an system constituted a supply, multistage <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$LC$</tex></formula> filters, ideal CPL. The...

Anticipating tumor metastasis by circulating cells captured acoustic microstreaming.

We demonstrate a controllable bubble-based acoustofluidic device that enables mode-switchable manipulation of micro-objects, including transportation, rotation, and revolution.

In view of the magnetically actuated capsule robot applications in diagnoses human stomach disease, challenges that are associated with degrees-of-freedom (DOF), environmental adaptability, and size entire system must be addressed. this study, a new electromagnetic coil is based on adaptive magnetic levitation presented; it mainly composed an independent orientation control coil. The designed to perform motion capsule, including 3-DOF levitating translational control, pitch yaw levitation....

With the rapid development of electric vehicle industry, motor bearings have higher requirements for friction reduction and electrical conductivity grease. The addition lubricant additives to improve interfacial state is an effective method enhancing both lubrication conductivity. In this study, graphene (G) silver nanoparticles (AG) were modified using ionic liquids (ILs) prepare additive liquid/graphene/silver (GILAG) with good performance. GILAG was incorporated into grease,...

Preventing and controlling agricultural non-point-source pollution, advancing the industry, facilitating cation–π interaction to address cation instability fertilizer loss are crucial for sustainability. Due unique π-bond characteristics of GO (graphene oxide), it was selected as a carrier improve anti-loss capabilities facilitate effective release nutrient ions. By adjusting interface properties GO, RGO (rippled graphene oxide) CGO (crumpled were successfully prepared, their interactions...

With the ongoing urbanisation, subway has become a vital component of modern cities, catering to escalating demands mobile population. However, increasing complexity passenger flows within stations poses challenges operations management. To optimise and enhance safety, researchers focus on extracting analysing pedestrian trajectories stations. Traditional trajectory extraction methods face limitations due manual feature design multi-stage processing. Leveraging advancements in deep learning,...

The convergence of art and technology represents an emerging trend, it has become crucial to apply advanced technologies traditional forms in order drive innovation the way is created, experienced, understood. aim this paper explore new paths for integration through development a symmetric dual-arm collaborative ceramics robot, thereby facilitating automation technologization creation. This study utilizes machine vision techniques path planning algorithms. Specifically, utilized identify...

The aircraft electric actuator is one of the most important kind loads future more aircraft. power characteristic an possesses feature rapidly varying in a wide range, and it shows constant load nature small-signal sense. In this paper, novel dc-bus voltage switched control method three-phase source pulsewidth-modulated rectifiers (VSRs), which aims to solve problem flexible regulating under dynamic loads, proposed cascade structure rotating synchronous coordinates d−q . Several linear...

Axial field flux-switching permanent magnet machine (AFFSPMM) is a novel stator PM with high torque density and efficiency. The cogging in AFFSPMM larger than that the traditional because of double salient structure. In order to decrease torque, analytical expression deduced reduction method by adding magnetic bridge adjacent tooth proposed. Based on 3-D finite-element (FE) method, influence thickness output analyzed compared rotor skewing notching methods. pole width studied. FE analysis...

Abstract This article aims to improve the shear delamination resistance of composite laminate and minimize implantation damage on fiber orientation by using fine z‐pins. The z‐pins with diameters as small 0.1 0.2 mm were prepared different carbon fibers. results show that z‐pinning method significantly improves mode II interlaminar fracture toughness, G IIC value becomes larger decrease in z‐pin diameter. Compared control sample, precracked values (carbon fiber‐reinforced polymer composite)...

The Bayesian uncertainty quantification technique has become well-established in turbulence modeling over the past few years. However, it is computationally expensive to construct a globally accurate surrogate model for inference high-dimensional design space, which limits complex flow configurations. Borrowing ideas from stratified sampling and inherited sampling, an adaptive refinement approach proposed this work, concentrates on asymptotically improving local accuracy of...