Aerospace最新文献_第4页

Modeling the Transient Dynamics of Arresting Hooks and Cables through the Parameter Inversion Method 通过参数反演法模拟避雷钩和缆绳的瞬态动力学模型

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-25 DOI: 10.3390/aerospace11010020

Long Li, Yiming Peng, Yifeng Wang, Xiaohui Wei, Hong Nie

{"title":"Modeling the Transient Dynamics of Arresting Hooks and Cables through the Parameter Inversion Method","authors":"Long Li, Yiming Peng, Yifeng Wang, Xiaohui Wei, Hong Nie","doi":"10.3390/aerospace11010020","DOIUrl":"https://doi.org/10.3390/aerospace11010020","url":null,"abstract":"Arresting gear systems play a vital role in carrier-based aircraft landing. In order to accurately understand the process of arresting hook and cable, this study introduces a parameter inversion method to model the arresting cable and applies it to the transient dynamics model of the arresting hook and cable. The feasibility of the arresting cable model and its application to the transient dynamics model of the arresting hook and cable are validated through arresting hook and cable impact tests. The study compares three different models of arresting cables for simulation results and concludes that assuming the arresting cable to be a beam with metal elastic parameters during the modeling process cannot ignore the influence of the cable’s torsional and bending stiffness on the modeling. The study also investigates the dynamic response of the arresting hook during the aircraft arrestment and hooking process and concludes that the stress peak of the hook arm is much lower throughout the entire arrestment process than at the moment of hooking the cable. The study further identifies factors that affect the stress on the arresting hook arm, such as the aircraft’s yaw angle, deck angle, cruising speed, and the initial position of the arresting hook and cable before engagement. The research results have significant implications for improving the design optimization of the structural strength of the functional components of the naval aircraft arresting system and provide theoretical guidance and technical reserves for subsequent related studies.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":"31 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139159347","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

A Review of the Current Regulatory Framework for Supersonic Civil Aircraft: Noise and Emissions Regulations 超音速民用飞机现行监管框架回顾：噪声与排放法规

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-25 DOI: 10.3390/aerospace11010019

Thomas Rötger, Chris Eyers, Roberta Fusaro

{"title":"A Review of the Current Regulatory Framework for Supersonic Civil Aircraft: Noise and Emissions Regulations","authors":"Thomas Rötger, Chris Eyers, Roberta Fusaro","doi":"10.3390/aerospace11010019","DOIUrl":"https://doi.org/10.3390/aerospace11010019","url":null,"abstract":"The request for faster and greener civil aviation is urging the worldwide scientific community and aerospace industry to develop a new generation of supersonic aircraft, which are expected to be environmentally sustainable, and to guarantee a high level of protection for citizens. The availability of novel propulsive technologies, together with the development of new civil supersonic passenger aircraft configurations and missions, is pushing international authorities to update the regulatory framework to limit nuisances on the ground and the contribution to climate change. Existing ICAO noise and emissions standards are outdated as they were developed in the 1970s and tailored to Concorde, the only SST that has ever operated in Western airspace. This article provides (i) a comprehensive review of current environmental regulations for SST, encompassing noise and pollutant emissions near airports (LTO cycle) as well as CO2 emissions and sonic booms, and (ii) updated information about the ongoing rulemaking activities by ICAO, FAA and EASA. This review clearly highlights the following findings: (i) the need to revise current rules to better fit future SST design, operations and technologies; (ii) the need to introduce new regulations to cover additional aspects, including stratospheric water vapour emissions and ozone depletion; and (iii) the need to support regulatory activities with solid technical bases, fostering cooperation with academia, research centres and industry in R&D projects. Eventually, a practical example of how SST rulemaking activities are supported by the collaborative research H2020 MORE&LESS is reported.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":"46 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139158671","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 of Unsteady Aerodynamic Characteristics of Electrically Controlled Rotor Airfoils with Trailing-Edge Flaps 带拖尾襟翼的电控转子翼面的非稳态气动特性研究

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-24 DOI: 10.3390/aerospace11010018

Changwu Liang, Hong Li, Taoyong Su, Caleb Alistair Frank, Kewei Li

{"title":"Research of Unsteady Aerodynamic Characteristics of Electrically Controlled Rotor Airfoils with Trailing-Edge Flaps","authors":"Changwu Liang, Hong Li, Taoyong Su, Caleb Alistair Frank, Kewei Li","doi":"10.3390/aerospace11010018","DOIUrl":"https://doi.org/10.3390/aerospace11010018","url":null,"abstract":"An electrically controlled rotor (ECR), also known as a swashplateless rotor, eliminates the swashplate system to implement the primary control via the trailing-edge flaps (TEFs), which can result in enhancements in rotor performance, as well as substantial reductions in weight, drag, and cost. In this paper, the unsteady aerodynamic characteristics of the airfoil with TEF of a sample ECR under unsteady freestream condition are investigated. The CFD results are obtained with sliding and overset grid techniques that simulate the airfoil pitching and flap deflection. Comparative analysis of the aerodynamic characteristics under steady and unsteady freestream conditions at different advance ratios is conducted. At various advance ratios, the lift and drag coefficients are higher at a small angle of attack under unsteady freestream condition; however, it is the opposite at a large angle of attack. The peak values of the lift and drag coefficients show an increased trend with the increase in the advance ratio. On the contrary, the pitch moment and flap hinge moment coefficients demonstrate minor variation under unsteady freestream condition. Furthermore, the aerodynamic characteristics of airfoils become more unsteady with variation in the freestream. Therefore, the lift and drag coefficients of the ECR airfoil with TEF show significant differences between steady and unsteady freestream conditions; however, the pitch moment and the flap hinge moment coefficients show little difference.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":"558 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139160693","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

An Unsteady Reynolds–Averaged Navier–Stokes–Large Eddy Simulation Study of Propeller–Airframe Interaction in Distributed Electric Propulsion 分布式电力推进中螺旋桨与机身相互作用的非稳态雷诺平均纳维-斯托克斯-大涡流模拟研究

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-24 DOI: 10.3390/aerospace11010017

Omkar Walvekar, Satyanarayanan Chakravarthy

{"title":"An Unsteady Reynolds–Averaged Navier–Stokes–Large Eddy Simulation Study of Propeller–Airframe Interaction in Distributed Electric Propulsion","authors":"Omkar Walvekar, Satyanarayanan Chakravarthy","doi":"10.3390/aerospace11010017","DOIUrl":"https://doi.org/10.3390/aerospace11010017","url":null,"abstract":"A conceptual framework is presented to determine the improvement in the aerodynamic performance of a canard aircraft fitted with distributed propellers along its main wing. A preliminary study is described with four airframe–propeller configurations predominantly studied in academic and commercial designs. The leading edge–based tractors and trailing edge–based pushers are identified as configurations of interest for the main study. Subsequently, a Navier–Stokes solver is used to simulate the flow using two numerical approaches–a modified steady-state actuator disk and an unsteady rotating propeller profile. Moving meshes with rotating sub-domains are used with a hybrid RANS-LES-based turbulence model while the actuator disks are modified to include viscous swirl effects. The preliminary study shows a local minimum in the change in CL and CD at 10∘ for the pusher and tractor configurations. The main study then demonstrates the outperformance of the pushers over tractors quantified using CL and CL/CD. There is a clear preference for the pushers as they increase the lifting capacity of the aircraft without disproportionately increasing the drag due to the flow smoothening by the suction of the pusher propellers over the main wing. The pushers also delay the separation of the boundary layer whereas the tractors are unable to prevent the formation of the separation bubble despite injecting momentum through their slipstreams into the flow. The results from the two numerical approaches are then compared for accuracy in designing DEP configurations for an airframe.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":"1974 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139160546","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

Analyzing Multi-Mode Fatigue Information from Speech and Gaze Data from Air Traffic Controllers 从空中交通管制员的语音和目光数据中分析多模式疲劳信息

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-24 DOI: 10.3390/aerospace11010015

Lin Xu, Shanxiu Ma, Zhiyuan Shen, Shiyu Huang, Ying Nan

引用次数: 0

Flight-Validated Electric Powertrain Efficiency Models for Small UASs 经飞行验证的小型无人机系统电动动力总成效率模型

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-24 DOI: 10.3390/aerospace11010016

Farid Saemi, Moble Benedict

{"title":"Flight-Validated Electric Powertrain Efficiency Models for Small UASs","authors":"Farid Saemi, Moble Benedict","doi":"10.3390/aerospace11010016","DOIUrl":"https://doi.org/10.3390/aerospace11010016","url":null,"abstract":"Minimizing electric losses is critical to the success of battery-powered small unmanned aerial systems (SUASs) that weigh less than 25 kgf (55 lb). Losses increase energy and battery weight requirements which hinder the vehicle’s range and endurance. However, engineers do not have appropriate models to estimate the losses of a motor, motor controller, or battery. The aerospace literature often assumes an ideal electrical efficiency or describes modeling approaches that are more suitable for controls engineers. The electrical literature describes detailed design tools that target the motor designer. We developed SUAS powertrain models targeted for vehicle designers and systems engineers. The analytical models predict each component’s losses using high-level specifications readily published in SUAS component datasheets. We validated the models against parametric experimental studies involving novel powertrain flight data from a specially instrumented quadcopter. Given propeller torque and speed, our integrated models predicted a quadcopter’s battery voltage within 5% of experimental data for a 5+ min mission despite motor and controller efficiency errors up to 10%. The models can reduce development costs and timelines for different stakeholders. Users can evaluate notional or existing powertrain configurations over entire missions without testing any physical hardware.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":"1990 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139160461","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

Simulation and Validation of an Incremental Bending Process for Cylindrical Fuselage Components 圆柱形机身部件增量式弯曲工艺的模拟与验证

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-24 DOI: 10.3390/aerospace11010014

Jan Jepkens, P. Müller, H. Wester, S. Hübner, Simon Wehrmann, Bernd-Arno Behrens

引用次数: 0

Research on the Motion and Dynamic Characteristics of the Hose-and-Drogue System under Bow Wave 弓形波下软管和代管系统的运动和动态特性研究

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-23 DOI: 10.3390/aerospace11010013

Chunjie Zheng, Haitao Wang, Lanxiang Hu, Yuanli Cai

引用次数: 0

Toward Zero Carbon Emissions: Investigating the Combustion Performance of Shaped Microcombustors Using H2/Air and NH3/Air Mixtures 实现零碳排放：研究使用 H2/Air 和 NH3/Air 混合物的异型微型燃烧器的燃烧性能

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-22 DOI: 10.3390/aerospace11010012

Giacomo Cinieri, Zubair Ali Shah, Guido Marseglia, M. D. De Giorgi

{"title":"Toward Zero Carbon Emissions: Investigating the Combustion Performance of Shaped Microcombustors Using H2/Air and NH3/Air Mixtures","authors":"Giacomo Cinieri, Zubair Ali Shah, Guido Marseglia, M. D. De Giorgi","doi":"10.3390/aerospace11010012","DOIUrl":"https://doi.org/10.3390/aerospace11010012","url":null,"abstract":"The research effort in the microcombustor field has recently increased due to the demand for high-performance systems in microelectromechanical and micro power generation devices. To address rising concerns about pollutants from fossil sources, zero-carbon fuels such as hydrogen (H2) and ammonia (NH3) have been considered as an alternative in microcombustion processes. In a microcombustor, the surface area-to-volume ratio is much higher compared to conventional combustion systems, resulting in faster heat transfer rates and more intense combustion reactions. However, achieving efficient mixing of fuel and an oxidizer in a microcombustor can be challenging due to its small size, particularly for highly reactive fuels like H2. For NH3, challenges in microcombustion involve a low reactive, high ignition temperature (923 K vs. 793 K of H2) and high concentration of NOx combustion products. Therefore, studying the performance of these fuels in microcombustors is important for developing clean energy technologies. In this paper, to explore features of non-premixed NH3/air and H2/air combustion in micro-scale combustors, an Ansys Fluent numerical investigation was conducted on a Y-shaped microcombustor. Results show that for combustion with H2, stationary flames can be achieved even at lower equivalence ratios. Additionally, the pollutants generated from H2 in the flame are generally twice those of NH3. The overall efficiency of the microcombustor is two times greater for NH3 conditions than for H2 conditions.","PeriodicalId":48525,"journal":{"name":"Aerospace","volume":"60 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138945911","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

Untangling Complexity in ASEAN Air Traffic Management through Time-Varying Queuing Models 通过时变排队模型解开东盟空中交通管理的复杂性

IF 2.6 3区工程技术

Aerospace Pub Date : 2023-12-22 DOI: 10.3390/aerospace11010011

Eri Itoh, Koji Tominaga, Michael Schultz, Vu N. Duong

引用次数: 0