Aiming at the problems of low detection accuracy and large computing resource consumption existing Unmanned Aerial Vehicle (UAV) algorithms for anti-UAV, this paper proposes a lightweight UAV swarm method based on You Only Look Once Version X (YOLOX). This uses depthwise separable convolution to simplify optimize network, greatly simplifies total parameters, while is only partially reduced. Meanwhile, Squeeze-and-Extraction (SE) module introduced into backbone improve model′s ability extract...

An active magnetic bearing (AMB) rotor system has such advantages as no friction and vibration control. However, harmonic current caused by mass imbalance sensor runout of magnetically suspended will lead to vibration. The frequency is changed with the variation rotation speed. suppression at variable speed a challenging research topic. In order suppress in AMB whose frequencies are integer multiples maintain stability, multiple phase-shift notch filters proposed this paper. closed-loop...

Abstract In this study, dynamic formation tracking and interception are performed by controlling multi-agent using a Euler-like Lagrangian model. The purpose is to use the distance-based rigid graph method control multi-agent, ultimately achieve target of multi-agent. Initially, stiffness back-stepping techniques were considered address challenge. This helps initial expected effectively complete mission. Leaders continue chase moving target, while followers stick arrangement. leader then...

<title>Abstract</title> In response to the challenge of insufficient target detection accuracy for UAVs in adverse environments(such as low light, dense fog, and extreme weather), this paper proposes a lightweight multi-modalfusion network, MMT-NET, UAV such conditions. The network significantlyimproves performance complex environments by fusing complementary characteristicsof infrared visible light images, combined with design. MMT-NET is based on RT-DETR framework uses MobileNetV4 backbone...

This paper investigates a hybrid fractional repetitive control (HFRC) scheme for magnetically suspended rotor systems to suppress harmonic current caused by mass imbalance and sensor runout. With parallel structure, HFRC consists of frequency-adaptive dual-mode controller (DMRC) phase-shift notch filter. By introducing delay filters, the proposed DMRC provides frequency adaptability eliminate odd even harmonics independently at fixed sampling rate. Its time is halved compared with...

In recent years, the increasing number of unmanned aerial vehicles (UAVs) in low-altitude airspace have not only brought convenience to people’s work and life, but also great threats challenges. process UAV detection tracking, there are common problems such as target deformation, occlusion, targets being submerged by complex background clutter. This paper proposes an anti-occlusion tracking algorithm for backgrounds integrating attention mechanism that mainly solves occlusion when UAVs....

Magnetically suspended rotor has the characteristics of no friction and active vibration control. The mass unbalance sensor runout induce harmonic current, which will cause vibration. ratio sampling rate to fundamental frequency current is often not an integer. existing repetitive control (RC) for suppression in magnetic bearing applicable integer case. Harmonic performance degraded drastically if fractional. In this paper, combined finite-impulse response (FIR) fractional-order RC proposed....

In recent years, with the rapid development of unmanned aerial vehicles (UAV) technology and swarm intelligence technology, hundreds small-scale low-cost UAV constitute swarms carry out complex combat tasks in form ad hoc networks, which brings great threats challenges to low-altitude airspace defense. Security requirements for defense, using visual detection detect track incoming swarms, is premise anti-UAV strategy. Therefore, this study first collected many videos manually annotated a...

In this paper, a new algorithm based on improved BP (back propagation) neural network for Chinese vehicle license plate recognition (LPR) is described. The proposed approach provides solution the plates (VLP) which were degraded severely. What it remarkably differs from traditional methods application of prior knowledge to procedure location, segmentation and recognition. Color collocation used locate in image. Dimensions each character are constant, segment VLPs. Layout VLP an important...

Magnetic soft microrobots have a wide range of applications in targeted drug therapy, cell manipulation, and other aspects. Currently, the research on magnetic is still exploratory stage, most focuses single helical structure, which has limited space to perform drug-carrying tasks efficiently cannot satisfy specific medical goals terms propulsion speed. Therefore, balancing motion speed performance current challenge overcome. In this paper, magnetically controlled cone-helix microrobot...

Effective path planning is essential for autonomous drone flight to enhance task efficiency. Many researchers have applied swarm intelligence algorithms planning. For instance, the traditional Butterfly Optimization Algorithm (BOA) has been used this purpose. However, BOA faces challenges such as slow convergence and susceptibility being trapped in local optima. An Improved (IBOA) developed identify optimal routes address these limitations. Initially, ICMIC mapping utilized establish...

The use of active materials for the actuators in soft robots allows safe interactions and adaptable locomotion. However, stimulating behavior as well reprogramming them implementing reversible control remains a challenge. Herein, method fabricating soft, bio‐inspired, untethered, infrared‐driven that exhibit reprogrammable behaviors is proposed. By exploiting mismatch thermomechanical responses two constituting bilayered actuator, actuation can be realized. More importantly, shape based on...

Synchronized Switch Damping (SSD) is a semi-active damping technology based on piezoelectric materials. It has advantages such as broadband and no need to tune. Despite the nonlinear governing equations, structures with SSD exhibit quasi-linear behaviour resonant frequencies hardly vary respect energy level of excitation. Inspired by these phenomena, in this paper we propose linearisation method for SSD, where force equivalent frequency-dependent viscous linear stiffness coefficients....

In complex environments such as night, fog, and battlefield camouflage, a single camera sensor is not sufficient to reflect scene information, multisource can raise environmental awareness. A visible light with an infrared efficient combination. However, there are huge differences in the inputs from different sensors, how fuse information two sensors apply it specific task problem that needs be solved. Hence, input detection algorithm combination of cameras proposed this article. Its purpose...

Aiming at the problem of network lifetime wireless sensor (WSN), this paper presents an optimization algorithm based on LEACH algorithm. In algorithm, some nodes in vicinity base station connect to directly, we extend life by increasing energy consumption share with network; after cluster is established, elect secondary head from cluster, collect information and pass head, station. Proved simulation, can approximately twice cycle compared traditional DEEC.

Abstract Underplatform dampers (UPDs) not only dissipate vibration energy of turbine blades, but also generate substantial frictional heat. The heat may potentially elevate the interface temperature beyond melting point. Moreover, increased can alter friction coefficient and contact normal force, significantly affecting damping performance UPDs. Consequently, blade dynamics are highly coupled with thermal effect. corresponding dynamic behaviors (e.g. forced response, nonlinear mode) should...

Abstract Addressing the optimal path planning problem encountered by swarm of unmanned aerial vehicle (UAV) in three-dimensional space under multiple constraints, Multi-population Adaptive Cuckoo Search and Grey Wolf Optimizer (MACSGWO) integrates Multi-Population (MP) strategies adaptive evolutionary optimizer including enhanced (AGWO) search (ACS). The strategically divides initial population into sub-groups, enabling each sub-group to independently iterate. During iteration process,...

This article is the first attempt to examine relationship between Chinese provincial GDP growth and CO 2 emission indicators. The complete Laspeyres index method adopted decompose change of into quantitative influence carbon amount, structure adjustment, productivity improvement. Based on 2001–2009 data, decomposition results reveal three important areas for further improvement productivity: (a) high rate emissions has imposed enormous pressures productivity. Thus, decreasing indispensable....