The random fluctuations in inlet flow represent a common uncertainty aero-engine compressors, necessitating the control of its effects through blade optimization design. To account for impact on performance design optimization, an efficient multi-objective adaptive robust aerodynamic (ARADO) method is proposed. employs novel sparse polynomial chaos expansion (PCE) and advanced noisy Gaussian process regression (NGPR) technique used to establish initial stochastic surrogate model (SSM)...

Albatrosses can make use of the dynamic soaring technique extracting energy from wind field to achieve large-scale movement without a flap, which stimulates interest in effortless flight with small unmanned aerial vehicles (UAVs). However, mechanisms harvesting terms transfer flyer (albatross or UAV) are still indeterminate and controversial when using different reference frames previous studies. In this paper, classical four-phase Rayleigh cycle, includes sequentially upwind climb, downwind...

Abstract Introduction This article presents a case study of invasive pulmonary aspergillosis (IPA) characterized by atypical symptoms, specifically pain in the left upper limb. It delineates clinical manifestations exhibited patient, diagnostic procedures undertaken, and therapeutic interventions experienced. Case presentation A 75-year-old male patient has been afflicted with spontaneous discomfort scapular region, medial aspect arm, ulnar forearm since March 2023. The initial diagnosis was...

Purpose – The purpose of this paper is to propose a methodology determine the designing parameters for solar powered high‐altitude, long‐endurance (HALE) unmanned aerial vehicles (UAV).

Nowadays, unmanned aerial vehicles (UAVs) pose a significant challenge to air defense systems. Unmanned combat (UCAVs) have been proven be an effective method counter the threat of UAVs in application. Therefore, maneuver decision-making has become crucial technology achieve autonomous for UCAVs. In order solve problem decision-making, model UCAVs based on deep reinforcement learning was proposed this paper. Firstly, six-degree-of-freedom (DoF) dynamic built three-dimensional space, and...

This communication presents the design of a wideband circularly polarized (CP) antenna array based on sequential rotation (SR) technique that is excited by substrate integrated coaxial line (SICL) with mature and stable processing technology for millimeter-wave (mm-wave) applications. Initially, influence amplitude phase errors feeding network axial ratio CP analyzed, detailed scheme SR summarized, which can be used to wide bandwidth high polarization purity. Then, an SICL-fed...

Gravitational gliding during night without electric power is an efficient method to enhance the endurance of high-altitude solar-powered unmanned aerial vehicles. The properties maximum path gravitational are studied in this article. problem formulated as can be sustained by unit altitude difference with constraints dynamic equations and aerodynamic parameters. generated Gauss pseudo-spectral method, a new way estimate co-state variables Hamiltonian proposed. In order analyze sensitivity...

It is important to find the shortest path for manoeuvres of UAV, since power consumed during tightly coupled with length flight path.In this paper, an algorithm that can and improve performance UAV follow waypoints described.The derived firstly by theory Dubins curve.Secondly, in order ability optimal path, a real-time planning designed transforming constraints curve into dynamic equation.To demonstrate applicability proposed algorithm, two numerical examples are presented.The results show...

Like albatross, unmanned aerial vehicles can significantly make use of wind gradient to extract energy by the flight technique named dynamic soaring. The research aims develop a general optimization method compute all possible patterns soaring with small vehicle. A direct collocation approach based on Runge-Kutta integrator is proposed solve trajectory problem for optimal trajectories are classified into two patterns: closed pattern and travelling applying terminal constraints zero...

The environment of the steel factory workshop is complex, and there may be a variety unexpected potential dangers, so wearing helmet to enter prerequisite for factory. In order supervise this situation, it necessary employees wear helmets testing, which key part overall intelligent monitoring system plant personnel. paper, through crawler collect high-definition no pictures, using manual labeling, proposed detection framework based on computer vision deep learning Faster-RCNN. actual testing...

The design parameters of high-altitude solar-powered aircraft are highly correlative with its flight trajectory. However, it is not an easy work to jointly optimize them in the concept stage. This paper considers joint optimization problem battery mass and trajectory for aircraft. system model including dynamic model, aerodynamic parameters, thrust presented. Then be optimized formulated a new method, which uses particle swarm Gauss pseudo-spectral proposed. method employed generate minimal...

The design of guidance and control strategies is a promising study trend dynamic soaring for small unmanned aerial vehicles, which the flight modeling simulation specifically soaring-capable vehicles significant necessary. aim this paper to propose platform soaring. In order do so, firstly, two different sets equations motion have been derived their characteristics are compared: one expressed in body-fixed frame other air-relative path frame. Secondly, latter set used energy analysis...

This paper presents a review of research works related to the application dynamic soaring for extracting and collecting energy from certain structures in wind using small unmanned aerial vehicles (UAVs). By soaring, UAVs can extract shear produce electrical power or conduct high-speed, long-endurance mission without adding extra weight. Combined with rapid technological development UAVs, might become new way explore nature's energy; extracted source renewable sustainable energy. In this...

This article introduces a rapid interception trajectory generation algorithm tailored for the mitigation of malicious drone activities and other high-speed airborne threats. The proposed method facilitates high degree flexibility in defining terminal state parameters, including position, velocity, acceleration, as well anticipated duration maneuvers, thereby enabling fulfillment variety mission objectives. approach employed this study linearizes aerodynamic resistance model computes an...

Abstract Purpose The purpose of this study is to present a methodology for parameters' sensitivity analysis solar-powered airplanes. Design/methodology/approach focuses on preliminary design and relations heavier-than-air, solar-powered, high-altitude long-endurance unmanned aerial vehicle. founded the balance energy production requirement. An analytic expression with four generalized parameters derived determine airplane flying specific altitude. sensitivities altitude are then analyzed....

Over the last decade, many flight tests of conventional/canard/flying-wing layout UAVs (unmanned aerial vehicle) have proven that trailing-edge circulation control (CC) is an effective method to generate a significant rolling moment for control. However, Coanda jet’s three-dimensional effects, especially jet direction, on design UCAVs combat air not been revealed and discussed clearly yet. In order solve this problem, effects direction swept wing’s aerodynamics flow physics are investigated...