Aerospace最新文献_第2页

Numerical Analysis of the Water Entry Process of the Cabin Structure of the Trans-Domain Morphing Aircraft Considering Structural Deformation 考虑结构变形的跨域变形飞机客舱结构进水过程的数值分析

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-25 DOI: 10.3390/aerospace11080611

Yu Zhang, Ziyi He, Chen Wang, Qi Hu, Songwen Dong, X.X. Shen, Jun Zhang, Taoxi Wang

{"title":"Numerical Analysis of the Water Entry Process of the Cabin Structure of the Trans-Domain Morphing Aircraft Considering Structural Deformation","authors":"Yu Zhang, Ziyi He, Chen Wang, Qi Hu, Songwen Dong, X.X. Shen, Jun Zhang, Taoxi Wang","doi":"10.3390/aerospace11080611","DOIUrl":"https://doi.org/10.3390/aerospace11080611","url":null,"abstract":"During the water entry process of a trans-domain morphing aircraft, significant impact forces are generated when the aircraft hits the water surface, which will potentially cause the deformation of the cabin structure and might damage the structure or onboard devices. Thus, it is necessary to investigate the water entry process of the cabin structure. This paper analyses changes in fluid loads and the corresponding structural responses during the water entry process. Firstly, the numerical model is established for the water entry process and the modeling method is validated by comparing the results to the experimental data. An empirical formula is developed to correlate the impact loads with the water entry velocities. Then, fluid–structure interaction analysis of the water entry process is performed using a two-way coupling approach. The relationship between structural deformation and the water entry process is then investigated. The results are compared with those without considering the structural deformation. The empirical formula is then modified to reflect the effects of the deformation. The results show that structural deformation will disperse the impact load, which represents different responses compared to the rigid cabin structure.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141803368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Restrain Performance of Child Restraint Systems for 1.5-Year-Old Children on Commercial Airplanes: An Experimental Study 商用飞机上 1.5 岁儿童约束系统的约束性能：实验研究

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-25 DOI: 10.3390/aerospace11080609

Xiaopeng Shi, Yifan Zhou, Chen Xiong, Yafeng Wang, Yonglong He, Zhenyu Feng, Jiang Xie

{"title":"Restrain Performance of Child Restraint Systems for 1.5-Year-Old Children on Commercial Airplanes: An Experimental Study","authors":"Xiaopeng Shi, Yifan Zhou, Chen Xiong, Yafeng Wang, Yonglong He, Zhenyu Feng, Jiang Xie","doi":"10.3390/aerospace11080609","DOIUrl":"https://doi.org/10.3390/aerospace11080609","url":null,"abstract":"This study aims to compare the restraint performance of two child restraint systems (CRSs) used on airplanes—a rear-facing child seat (RFCS) and the child aviation restraint system (CARES)—for 1.5-year-old children, along with their compatibility with different types of aircraft seats. 16 g longitudinal dynamic tests were conducted on two types of aircraft seats with CRSs. Results indicate poor compatibility of CARES with Type A seats, significantly increasing the risk of head, neck, and abdominal injuries, with Nij exceeding the acceptable limit. In contrast, CARES exhibited good compatibility with Type B seats and effectively protected children. RFCS tests demonstrated effective injury risk reduction on both types of seats. It can be found that the performance of CARES depends on restraint status and seat dimensions; RFCSs provide adequate protection for 1.5-year-olds. Optimal protection can be achieved with smaller restrain angles of CRS and using thinner seat cushions. Compared to CARES, RFCSs better adapt to various aircraft seat structures, offering superior child protection.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141805234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Arrival and Departure Sequencing, Considering Runway Assignment Preferences and Crossings 考虑跑道分配偏好和交叉路口，确定到达和出发顺序

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-24 DOI: 10.3390/aerospace11080604

Ji Ma, Daniel Delahaye, Man Liang

引用次数: 0

Nonlinear Surrogate Model Design for Aerodynamic Dataset Generation Based on Artificial Neural Networks 基于人工神经网络的空气动力学数据集生成非线性替代模型设计

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-24 DOI: 10.3390/aerospace11080607

Guillermo Suarez , Emre Özkaya , Nicolas R. Gauger , Hans-Jörg Steiner , Michael Schäfer Schäfer , David Naumann

引用次数: 0

Influence of Double-Ducted Serpentine Nozzle Configurations on the Interaction Characteristics between the External and Nozzle Flow of Aircraft 双风道蛇形喷嘴配置对飞机外流和喷嘴流交互特性的影响

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-24 DOI: 10.3390/aerospace11080606

Jilong Zhu, Yi Zhang, Yao-hua Li, Liquan Zeng, Lei Miao, Neng Xiong, Yang Tao

{"title":"Influence of Double-Ducted Serpentine Nozzle Configurations on the Interaction Characteristics between the External and Nozzle Flow of Aircraft","authors":"Jilong Zhu, Yi Zhang, Yao-hua Li, Liquan Zeng, Lei Miao, Neng Xiong, Yang Tao","doi":"10.3390/aerospace11080606","DOIUrl":"https://doi.org/10.3390/aerospace11080606","url":null,"abstract":"To clarify the influence of the serpentine nozzle configurations on the flow characteristics and aerodynamic performance of aircraft, the flow features and aerodynamic performances of the double-ducted serpentine nozzles with different aspect ratios (AR), length–diameter ratios (LDR) and shielding ratios (SR) are numerically investigated. The results show that the asymmetric nozzle flow occurs due to the curved profile of serpentine nozzles, and a local accelerating effect exists at the S-bend, causing the increase in wall shear stress. The unilateral unsymmetrical expansion of the tail jet in the upward direction interacts with the separated external flow of the afterbody, forming an obvious cross-shock wave and shear layer structure. The surface pressure of the afterbody increases along the external flow direction, and decreases sharply in the separation point of the boundary layer. With the increase in AR and LDR, the local accelerating effect of the nozzle flow weakens, while with the increase in SR, the accelerating effect increases. The total pressure recovery coefficient, flow coefficient and axial thrust coefficient all decrease with the increase in AR, LDR, and SR. The thrust vector angle decreases with the increase in AR but is less affected by LDR and SR.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141808429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SE-CBAM-YOLOv7: An Improved Lightweight Attention Mechanism-Based YOLOv7 for Real-Time Detection of Small Aircraft Targets in Microsatellite Remote Sensing Imaging SE-CBAM-YOLOv7：基于轻量级注意机制的改进型 YOLOv7，用于在微卫星遥感成像中实时探测小型飞行器目标

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-24 DOI: 10.3390/aerospace11080605

Zhenping Kang, Yurong Liao, Shuhan Du, Haonan Li, Zhaoming Li

{"title":"SE-CBAM-YOLOv7: An Improved Lightweight Attention Mechanism-Based YOLOv7 for Real-Time Detection of Small Aircraft Targets in Microsatellite Remote Sensing Imaging","authors":"Zhenping Kang, Yurong Liao, Shuhan Du, Haonan Li, Zhaoming Li","doi":"10.3390/aerospace11080605","DOIUrl":"https://doi.org/10.3390/aerospace11080605","url":null,"abstract":"Addressing real-time aircraft target detection in microsatellite-based visible light remote sensing video imaging requires considering the limitations of imaging payload resolution, complex ground backgrounds, and the relative positional changes between the platform and aircraft. These factors lead to multi-scale variations in aircraft targets, making high-precision real-time detection of small targets in complex backgrounds a significant challenge for detection algorithms. Hence, this paper introduces a real-time aircraft target detection algorithm for remote sensing imaging using an improved lightweight attention mechanism that relies on the You Only Look Once version 7 (YOLOv7) framework (SE-CBAM-YOLOv7). The proposed algorithm replaces the standard convolution (Conv) with a lightweight convolutional squeeze-and-excitation convolution (SEConv) to reduce the computational parameters and accelerate the detection process of small aircraft targets, thus enhancing real-time onboard processing capabilities. In addition, the SEConv-based spatial pyramid pooling and connected spatial pyramid convolution (SPPCSPC) module extracts image features. It improves detection accuracy while the feature fusion section integrates the convolutional block attention module (CBAM) hybrid attention network, forming the convolutional block attention module Concat (CBAMCAT) module. Furthermore, it optimizes small aircraft target features in channel and spatial dimensions, improving the model’s feature fusion capabilities. Experiments on public remote sensing datasets reveal that the proposed SE-CBAM-YOLOv7 improves detection accuracy by 0.5% and the mAP value by 1.7% compared to YOLOv7, significantly enhancing the detection capability for small-sized aircraft targets in satellite remote sensing imaging.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141807507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of High-Speed Self-Aligned Focusing Schlieren System for Supersonic Flow Velocimetry 在超音速流速度测量中应用高速自对准聚焦雪莲系统

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-24 DOI: 10.3390/aerospace11080603

Philip A. Lax, Sergey B. Leonov

{"title":"Application of High-Speed Self-Aligned Focusing Schlieren System for Supersonic Flow Velocimetry","authors":"Philip A. Lax, Sergey B. Leonov","doi":"10.3390/aerospace11080603","DOIUrl":"https://doi.org/10.3390/aerospace11080603","url":null,"abstract":"A self-aligned focusing schlieren (SAFS) system combines the field of view of a conventional schlieren system with the defocus blur of a focusing schlieren system away from the object plane. It can be assembled in a compact form, measuring 1.2 m (4 ft) in length in the described case. The depth of field is sufficiently shallow to distinguish specific spanwise features in a supersonic flow field within a 76.2 mm (3 in) wide test section. As a result, the boundary-layer perturbations on windows and window-material defects and surface imperfections are blurred. Analytical forms are derived for depth of field and vignetting of the SAFS system. A laser spark velocity measurement in Mach 2 flow is performed by tracking the blast wave of a laser spark using 500 kHz SAFS imaging with a 200 ns optical pulse width. The flow Mach number and stagnation temperature are measured by comparing the blast-wave dynamics to an analytical solution. Additionally, schlieren image velocimetry is performed by analyzing natural flow perturbations in 500 kHz SAFS images using a self-correlation method. Comparing the spectra of gas density perturbations from the core flow and a near-wall region reveals a significant difference, with high-frequency prevalence at the boundary-layer location.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141807443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow-Based Assessment of the Impact of an All-Electric Aircraft on European Air Traffic 基于流量的全电动飞机对欧洲空中交通影响的评估

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-23 DOI: 10.3390/aerospace11080602

Bekir Yildiz, Peter Förster, T. Feuerle, Peter Hecker

{"title":"Flow-Based Assessment of the Impact of an All-Electric Aircraft on European Air Traffic","authors":"Bekir Yildiz, Peter Förster, T. Feuerle, Peter Hecker","doi":"10.3390/aerospace11080602","DOIUrl":"https://doi.org/10.3390/aerospace11080602","url":null,"abstract":"The consequences of new airspace entrants, such as novel aircraft concepts with innovative propulsion systems, on air traffic management operations need to be carefully identified. This paper aims to assess the impact of future aircraft with different performance envelopes on the European air traffic network from a flow-based perspective. The underlying approach assumes that all certification-related questions concerning airworthiness have been resolved and do not take into account any economic factors related to airline operations. For example, for an innovative propulsion system, a short range all-electric aircraft is considered in this study. Aircraft trajectory calculations are based on the dataset of base of aircraft data (BADA), which are developed and maintained by EUROCONTROL. The new design concept is integrated into BADA as well, resulting in a new set of coefficients for the all-electric aircraft. In addition to the adjusted parameters which affect airborne performances, ground-related aspects are also taken into account. This includes assumptions on operational procedures, charging capacities and adaptions in infrastructure. Investigations are carried out at the trajectory level as well as at the airport and the entire network.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141811923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the Design of Aviation and Aerospace Hatch Door Mechanisms and Their Future Bionic Prospects 航空航天舱门机构设计研究及其未来仿生前景

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-23 DOI: 10.3390/aerospace11080601

Zhiwu Cui, Haochang Wu, Ming Zhou, Zhihe Cui, Hao Huang, Ziyu Liu

{"title":"Research on the Design of Aviation and Aerospace Hatch Door Mechanisms and Their Future Bionic Prospects","authors":"Zhiwu Cui, Haochang Wu, Ming Zhou, Zhihe Cui, Hao Huang, Ziyu Liu","doi":"10.3390/aerospace11080601","DOIUrl":"https://doi.org/10.3390/aerospace11080601","url":null,"abstract":"The design of the space hatch door mechanisms is crucial in the aerospace field, impacting not only durability and reliability but also the life safety of astronauts during space missions. This review extensively researches vehicle doors and hatches in civil and military systems across various environments, including land, sea, deep sea, aviation, aerospace, and extreme conditions. Specially, it focuses on the structural design of hatches and related mechanisms in civil aviation and military aerospace environments, such as opening and closing mechanisms, release mechanisms, locking mechanisms, sealing mechanisms, and the ergonomic design of door structures. The review highlights the integration of bionic design principles with hatch mechanisms to explore future solutions. By systematically examining these aeras, this review addresses the lack of comprehensive studies in previous reviews, which often overlook the interconnectivity and applicability of hatch mechanisms across different fields. The absence of such holistic reviews has led to fragmented knowledge and missed opportunities for cross-industry innovation. This review aims to fill these gaps by providing a wide range of design solutions and offering insights that can enhance the development of more reliable, efficient, and safe hatch mechanisms in aerospace and other high-stakes environments.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141811051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated Waverider Forebody/Inlet Fusion Method Based on Discrete Point Cloud Reconstruction 基于离散点云重构的波浪机前体/进水口综合融合方法

IF 2.1 3区工程技术

Aerospace Pub Date : 2024-07-22 DOI: 10.3390/aerospace11070597

Zhiqi Liu, Geling Yin, Mingqiang Luo, Jinrong Zhang, Cheekeat Heng

{"title":"Integrated Waverider Forebody/Inlet Fusion Method Based on Discrete Point Cloud Reconstruction","authors":"Zhiqi Liu, Geling Yin, Mingqiang Luo, Jinrong Zhang, Cheekeat Heng","doi":"10.3390/aerospace11070597","DOIUrl":"https://doi.org/10.3390/aerospace11070597","url":null,"abstract":"The integrated design of waverider forebodies and inlets is considered a critical challenge in high Mach number vehicle development. To facilitate the rapid construction of integrated geometrical models for waverider forebodies and inlets during the conceptual design phase, a method based on discrete point cloud reconstruction has been proposed. In this method, the geometries of the waverider body and inlet are used as inputs and decomposed into the point cloud under discrete rules. This point cloud is refitted to generate new section lines, which are then lofted into an integrated shape under the constraints of guide curves. By modifying the coordinates of the point cloud positions, the geometric configuration of the integrated shape can be rapidly adjusted, providing initial support for subsequent aerodynamic optimization and thermal protection. Using this method, an integrated approach was applied to a waverider forebody and inward-turning inlet in a tandem configuration. This achieved body-inlet matching and integration, resulting in a 15.6% improvement in the inlet’s total pressure recovery coefficient. The integration time was reduced to just 3.18% of the time required for traditional manual adjustments. Additionally, optimization based on the discrete point cloud enhanced the lift-to-drag ratio by 7.83%, demonstrating the feasibility of the proposed method.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141817759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0