Aerospace最新文献_第8页

Parametric Design Method and Lift/Drag Characteristics Analysis for a Wide-Range, Wing-Morphing Glide Vehicle 大航程翼型变形滑翔飞行器的参数设计方法和升力/阻力特性分析

Aerospace Pub Date : 2024-03-25 DOI: 10.3390/aerospace11040257

Zikang Jin, Zonghan Yu, Fanshuo Meng, Wei Zhang, Jingzhi Cui, Xiaolong He, Yuedi Lei, Omer Musa

{"title":"Parametric Design Method and Lift/Drag Characteristics Analysis for a Wide-Range, Wing-Morphing Glide Vehicle","authors":"Zikang Jin, Zonghan Yu, Fanshuo Meng, Wei Zhang, Jingzhi Cui, Xiaolong He, Yuedi Lei, Omer Musa","doi":"10.3390/aerospace11040257","DOIUrl":"https://doi.org/10.3390/aerospace11040257","url":null,"abstract":"The parametric design method is widely utilized in the preliminary design stage for hypersonic vehicles; it ensures the fast iteration of configuration, generation, and optimization. This study proposes a novel parametric method for a wide-range, wing-morphing glide vehicle. The whole configuration, including a waverider fuselage, a rotating wing, a blunt leading edge, rudders, etc., can be easily described using 27 key parameters. In contrast to the typical parametric method, the new method takes internal payloads into consideration during the shape optimization process. That is, the vehicle configuration can be flexibly adjusted depending on the internal payloads; these payloads may be of random amounts and have different shapes. The code for the new parametric design method is developed using the secondary development tools of UG (UG 10.0) commercial software. The lift and drag characteristics over a wide operational range (H = 6–25 km, M = 2.5–8.5, AOA = 0–10°) were numerically investigated, as was the influence of the retracting angle of the morphing wings. It was found that, for the mode of the fully deployed wings, the lift-to-drag ratio (L/D) remained at a high level (≥4.7) over a Mach range of 4.0–8.5 and an AOA range of 4–7°. For the mode of the fully retracted wings, the drag coefficient remained smaller than 0.02 over a Mach range of 4.0–8.5 and an AOA range of 0–5°. A wide L/D of 0.3–4.7 could be achieved by controlling the retracting angle of the wings, thus demonstrating a good potential for flight maneuverability. The flexible change in L/D proved to be a combined result of varying pressure distribution and edge-flow spillage. This will aid in the further optimization of lift/drag characteristics.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":" 92","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Nonlinear Beam Finite Element with Bending–Torsion Coupling Formulation for Dynamic Analysis with Geometric Nonlinearities 用于几何非线性动态分析的弯曲扭转耦合非线性梁有限元计算公式

Aerospace Pub Date : 2024-03-25 DOI: 10.3390/aerospace11040255

Cesare Patuelli, Enrico Cestino, G. Frulla

引用次数: 0

An Eight-Node Non-Conforming Generalized Partial Hybrid Element and Its Application in Stress Analysis of Repaired Composite Laminate Structures 八节点非正规广义部分混合单元及其在修复复合材料层压板结构应力分析中的应用

Aerospace Pub Date : 2024-03-25 DOI: 10.3390/aerospace11040256

Ruishan Xing, Gang Li, Fan Wang, Yang Yang

{"title":"An Eight-Node Non-Conforming Generalized Partial Hybrid Element and Its Application in Stress Analysis of Repaired Composite Laminate Structures","authors":"Ruishan Xing, Gang Li, Fan Wang, Yang Yang","doi":"10.3390/aerospace11040256","DOIUrl":"https://doi.org/10.3390/aerospace11040256","url":null,"abstract":"To ensure the overall continuity of displacement and out-of-plane stress in composite laminate structures and to quantitatively analyze the mechanical properties of composite materials after damage or repair, a finite element solution method is applied based on the modified generalized H–R variational principle. This method utilizes an eight-node non-conforming generalized partial hybrid element (NCGPME8). The partial hybrid model established with this hybrid element can accurately satisfy the out-of-plane stress boundary conditions of the structure, ensuring the continuity of out-of-plane stress. Numerical examples are used to validate that this hybrid model can effectively compute thick and thin laminate structures with high accuracy and rapid convergence of out-of-plane stress. Finally, considering the insensitivity to irregular meshes and the accuracy in calculating in-plane stress, this method is propagated by element coefficient deduction or element material replacement, then employed to analyze the in-plane and out-of-plane stress distributions of laminates with damage from stepwise grinding perforations, and laminates repaired in a stepwise fashion. Stress and displacement at different locations on the laminates are compared and analyzed, leading to a quantitative assessment of the impact of damage and repair on the stress distribution of the laminates.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":" 685","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140382741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lunar Rover Collaborated Path Planning with Artificial Potential Field-Based Heuristic on Deep Reinforcement Learning 利用基于深度强化学习的人工势场启发式进行月球车协作路径规划

Aerospace Pub Date : 2024-03-24 DOI: 10.3390/aerospace11040253

Siyao Lu, Rui Xu, Zhaoyu Li, Bang Wang, Zhijun Zhao

{"title":"Lunar Rover Collaborated Path Planning with Artificial Potential Field-Based Heuristic on Deep Reinforcement Learning","authors":"Siyao Lu, Rui Xu, Zhaoyu Li, Bang Wang, Zhijun Zhao","doi":"10.3390/aerospace11040253","DOIUrl":"https://doi.org/10.3390/aerospace11040253","url":null,"abstract":"The International Lunar Research Station, to be established around 2030, will equip lunar rovers with robotic arms as constructors. Construction requires lunar soil and lunar rovers, for which rovers must go toward different waypoints without encountering obstacles in a limited time due to the short day, especially near the south pole. Traditional planning methods, such as uploading instructions from the ground, can hardly handle many rovers moving on the moon simultaneously with high efficiency. Therefore, we propose a new collaborative path-planning method based on deep reinforcement learning, where the heuristics are demonstrated by both the target and the obstacles in the artificial potential field. Environments have been randomly generated where small and large obstacles and different waypoints are created to collect resources, train the deep reinforcement learning agent to propose actions, and lead the rovers to move without obstacles, finish rovers’ tasks, and reach different targets. The artificial potential field created by obstacles and other rovers in every step affects the action choice of the rover. Information from the artificial potential field would be transformed into rewards in deep reinforcement learning that helps keep distance and safety. Experiments demonstrate that our method can guide rovers moving more safely without turning into nearby large obstacles or collision with other rovers as well as consuming less energy compared with the multi-agent A-Star path-planning algorithm with improved obstacle avoidance method.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":" 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140385106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative Study of Numerical Schemes for Granular Combustion of Boron Potassium Nitrate 硝酸钾硼颗粒燃烧数值方案比较研究

Aerospace Pub Date : 2024-03-23 DOI: 10.3390/aerospace11040251

Fabrizio Ponti, Filippo Maggi, Annie Rose, Sumit Sarma, T. Jayachandran, P. A. Ramakrishna, Mondeep Borthakur

引用次数: 0

Numerical Investigation and Optimization of a Morphing Airfoil Designed for Lower Reynolds Number 为降低雷诺数而设计的变形机翼的数值研究与优化

Aerospace Pub Date : 2024-03-23 DOI: 10.3390/aerospace11040252

Nebojša Lukić, Toni Ivanov, J. Svorcan, A. Simonović

{"title":"Numerical Investigation and Optimization of a Morphing Airfoil Designed for Lower Reynolds Number","authors":"Nebojša Lukić, Toni Ivanov, J. Svorcan, A. Simonović","doi":"10.3390/aerospace11040252","DOIUrl":"https://doi.org/10.3390/aerospace11040252","url":null,"abstract":"A novel concept of morphing airfoils, capable of changing camber and thickness, is proposed. A variable airfoil shape, defined by six input parameters, is achieved by allowing the three spinal points (at fixed axial positions) to slide vertically, while the upper and lower surfaces are determined by the lengths of the three corresponding ribs that are perpendicular to the spine. Thus, it is possible to find the most appropriate geometric configuration for a wide range of possible operating conditions often present with contemporary unmanned aerial vehicles. Shape optimizations for different Reynolds numbers and different cost functions are performed by coupling a genetic algorithm with simple panel method flow calculations. The obtained airfoils are presented and compared, whereas the proposed concept is validated by more advanced flow simulations. It appears that improvements in aerodynamic performance of nearly 20% can be expected at Re ranging from 0.05 × 106 to 0.1 × 106. The proposed methodology shows promise and can be applied to different types of lifting surfaces, including wing, tail or propeller blade segments. To check the viability of this method for producing airfoils that can be used in a practical sense, structural analysis of one of the obtained geometries using a simplified 1D finite element method as well as a more detailed 3D analysis are performed. The model is then 3D-printed on a fused deposition modeling (FDM) printer with a polyethylene terephthalate glycol (PETG) filament, and the capability of the airfoil to adequately morph between the two desired geometries is experimentally shown.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":"164 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140386924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variational Method-Based Trajectory Optimization for Hybrid Airships 基于变分法的混合动力飞艇轨迹优化

Aerospace Pub Date : 2024-03-22 DOI: 10.3390/aerospace11040250

Wen Gao, Yan-Qiang Bi, Xi-Yuan Li, Apeng Dong, Jing Wang, Xiao-Ning Yang

{"title":"Variational Method-Based Trajectory Optimization for Hybrid Airships","authors":"Wen Gao, Yan-Qiang Bi, Xi-Yuan Li, Apeng Dong, Jing Wang, Xiao-Ning Yang","doi":"10.3390/aerospace11040250","DOIUrl":"https://doi.org/10.3390/aerospace11040250","url":null,"abstract":"Hybrid airships, combining aerodynamic lift and buoyant lift, are efficient near-space aircraft for scientific exploration, observation, and surveillance. Compared to conventional airplanes and airships, hybrid airships offer unique advantages, including stationary hovering and rapid deployment. Due to the different task requirements and strong coupling between flight and environment, trajectory-optimization methods for traditional aircraft are difficult to apply to hybrid airships directly. We propose a trajectory-optimization model based on the variational method to calculate the optimal time and energy paths under weak, uniform, and latitudinal linear wind fields. Our model shows that the influencing factors for the optimization path can be categorized into three types: airship design parameters, wind field parameters, and departure parameters. The result indicates that the optimal time paths are generally straight lines, and the optimal energy paths are piecewise curves with a 24-h cycle under typical hybrid airship design parameters. This work has provided new insight into the trajectory optimization and parameter design of future hybrid airships.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140387346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Uncertain Flight Time on Heterogeneous UAVs’ Task Planning with Temporal Constraints 飞行时间不确定对具有时间约束条件的异构无人机任务规划的影响

Aerospace Pub Date : 2024-03-09 DOI: 10.3390/aerospace11030214

Jianfeng Wang, Gaowei Jia, Zheng Guo, Zhongxi Hou

{"title":"Impact of Uncertain Flight Time on Heterogeneous UAVs’ Task Planning with Temporal Constraints","authors":"Jianfeng Wang, Gaowei Jia, Zheng Guo, Zhongxi Hou","doi":"10.3390/aerospace11030214","DOIUrl":"https://doi.org/10.3390/aerospace11030214","url":null,"abstract":"Heterogeneous multi-UAV systems offer distinct advantages through their complementary and coordinated use of their diverse capabilities. However, this complexity poses significant challenges in task planning, particularly in considering temporal constraints among tasks. As task dependencies evolve from simple linear chains to complex networked associations, uncertainties in flight times can have a substantial impact on the overall schedule. To address these challenges, this study introduces a rapid estimation method that recursively calculates task completion times, derives their probability distributions, and assesses the robustness of the plan. Furthermore, a neighborhood search algorithm guided by dynamic time windows is designed to effectively evaluate the consequences of task insertions, precisely to adjust high-risk tasks, and reduce blindness in enumerative neighborhood exploration. Simulation results demonstrate that the proposed approach effectively accounts for inherent randomness in the problem and exhibits strong adaptability to changes in the problem scale, flight time fluctuations, and variations in time window constraints.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":"3 1‐6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140396542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modelling and Simulation in High-Fidelity Crash Analysis of NGCTR-TD Composite Wing NGCTR-TD 复合翼高保真碰撞分析中的建模与仿真

Aerospace Pub Date : 2024-02-29 DOI: 10.3390/aerospace11030196

L. Di Palma, M. Nardone, C. Pezzella, M. Belardo

引用次数: 0

A Decentralized Voting and Monitoring Flight Control Actuation System for eVTOL Aircraft 用于 eVTOL 飞机的分散式表决和监控飞行控制执行系统

Aerospace Pub Date : 2024-02-29 DOI: 10.3390/aerospace11030195

Ruichen He, Florian Holzapfel, Johannes Bröcker, Yi Lai, Shuguang Zhang

{"title":"A Decentralized Voting and Monitoring Flight Control Actuation System for eVTOL Aircraft","authors":"Ruichen He, Florian Holzapfel, Johannes Bröcker, Yi Lai, Shuguang Zhang","doi":"10.3390/aerospace11030195","DOIUrl":"https://doi.org/10.3390/aerospace11030195","url":null,"abstract":"The emergence of eVTOL (electrical Vertical Takeoff and Landing) aircraft necessitates the development of safe and efficient systems to meet stringent certification and operational requirements. The primary state-of-the-art technology for flight control actuation in eVTOL aircraft is electro-mechanical actuators (EMAs), which heavily rely on multiple redundancies of critical components to achieve fault tolerance. However, challenges persist in terms of insufficient reliability, immaturity, and a lack of a measurable evaluation method. This research addresses these issues by elucidating the design requirements for EMAs in eVTOL aircraft and proposing a systematic design and evaluation approach for EMA architecture. A key enhancement involves the incorporation of decentralized voting and monitoring (VoDeMo) mechanisms within the Electronic Control Units (ECUs) to improve the overall safety of the EMA. The paper introduces an innovative triple-dual redundant architecture for aircraft control effectors, comprising three dissimilar lanes of ECUs and two similar redundant parallel channels of power electronics and motors. The design is synergistically supported by a comprehensive evaluation that incorporates quantifiable Model-Based Safety Assessment (MBSA), utilizing both physical simulation and logical safety models. Hardware-In-the-Loop (HIL) tests are conducted on a constructed prototype to validate the proposed architecture.","PeriodicalId":505273,"journal":{"name":"Aerospace","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140412078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0