Frontiers in Aerospace Engineering最新文献_第3页

A review on the socio-environmental impacts of lithium supply for electric aircraft 电动飞机锂供应的社会环境影响综述

Frontiers in Aerospace Engineering Pub Date : 2022-12-02 DOI: 10.3389/fpace.2022.1058940

Melodie Chen-Glasser, S. DeCaluwe

{"title":"A review on the socio-environmental impacts of lithium supply for electric aircraft","authors":"Melodie Chen-Glasser, S. DeCaluwe","doi":"10.3389/fpace.2022.1058940","DOIUrl":"https://doi.org/10.3389/fpace.2022.1058940","url":null,"abstract":"Electrified aircraft have gained traction as a promising approach to emissions abatement in the aviation sector. This transition will require overcoming numerous technical challenges related to increasing battery energy density, as well as logistic challenges related to the lithium supply chain, which is already stressed due to high demand for electric vehicles. We have estimated that lithium demand for electrified aviation may raise lithium demand in the range of 10–250%. The uncertainty in these estimates show the importance of quantifying the impacts of electrified aviation and designing batteries to mitigate additional demand. In addition, most reviews on electrified aviation do not include information on the localized social and environmental impacts caused by lithium demand, despite their importance to enabling technology necessary for emissions reductions. This review seeks to fill this gap by presenting an overview of environmental and social research in context with one another to encourage researchers in the field to consider these dynamics as part of electrified aircraft design. Given that the high energy density batteries necessary to enable large-scale electrification of aircraft are still under development, continued progress in this field should emphasize sustainable governance for lithium extraction and a circular battery economy to reduce social and environmental stressors.","PeriodicalId":365813,"journal":{"name":"Frontiers in Aerospace Engineering","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127108149","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

Wind-optimal lateral trajectories for a multirotor aircraft in urban air mobility 城市空中机动多旋翼飞机的风最优横向轨迹

Frontiers in Aerospace Engineering Pub Date : 2022-11-30 DOI: 10.3389/fpace.2022.1064142

Priyank Pradeep, G. Chatterji, T. Lauderdale, K. Sheth, C. Lai, H. Erzberger, B. Sridhar

{"title":"Wind-optimal lateral trajectories for a multirotor aircraft in urban air mobility","authors":"Priyank Pradeep, G. Chatterji, T. Lauderdale, K. Sheth, C. Lai, H. Erzberger, B. Sridhar","doi":"10.3389/fpace.2022.1064142","DOIUrl":"https://doi.org/10.3389/fpace.2022.1064142","url":null,"abstract":"The primary motivation for this paper is to quantify the operational benefits (energy consumption and flight duration) of flying wind-optimal lateral trajectories for short flights (less than 60 miles) anticipated in the urban environment. The optimal control model presented includes a wind model for quantifying the effect of wind on the lateral trajectory. The optimal control problem is numerically solved using the direct collocation method. Energy consumption and flight duration flying wind-optimal lateral trajectories are compared with corresponding values obtained flying great-circle paths between the same origin and destination pairs to determine the operational benefits of wind-optimal routing for short flights. The flight duration results for different scenarios are validated using a simulation tool designed and developed at NASA for exploring advanced air traffic management concepts. This research study suggests that for short flights in an urban environment, operational benefits of the wind-optimal lateral trajectories over the corresponding great-circle trajectories in terms of energy consumption and flight duration per flight are dependent on: i) wind field’s spatial variability, ii) wind magnitude, iii) the direction of route relative to the wind field, and iv) cruise segment length. The operational benefits observed in realistic flyable wind scenarios are less than 2.5%; these could be translated to an equivalent of a maximum of 2 min of cruise flight duration savings in the urban air mobility environment. As expected, headwinds and tailwinds along the flight route most significantly impact energy consumption and flight duration.","PeriodicalId":365813,"journal":{"name":"Frontiers in Aerospace Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114397506","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: 1

Bayesian state estimation in partially-observed dynamic multidisciplinary systems 部分观测动态多学科系统的贝叶斯状态估计

Frontiers in Aerospace Engineering Pub Date : 2022-11-25 DOI: 10.3389/fpace.2022.1036642

Negar Asadi, S. F. Ghoreishi

引用次数: 1

Review of experimental investigations of wings in ground effect at low Reynolds numbers 低雷诺数下机翼地面效应实验研究综述

Frontiers in Aerospace Engineering Pub Date : 2022-11-15 DOI: 10.3389/fpace.2022.975158

T. Lee, G. Lin

引用次数: 3

Characterization of the low-noise drone propeller with serrated Gurney flap 具有锯齿状轮尼襟翼的低噪声无人机螺旋桨的特性研究

Frontiers in Aerospace Engineering Pub Date : 2022-10-14 DOI: 10.3389/fpace.2022.1004828

R. Noda, Teruaki Ikeda, T. Nakata, Hao Liu

引用次数: 1

Efficacy of an elasto-flexible morphing wing at high lift using fluid-structure-interaction simulations 基于流固耦合模拟的高升力弹柔变形翼效能研究

Frontiers in Aerospace Engineering Pub Date : 2022-10-13 DOI: 10.3389/fpace.2022.975600

J. Pflüger, M. Von Langsdorff, C. Breitsamter

{"title":"Efficacy of an elasto-flexible morphing wing at high lift using fluid-structure-interaction simulations","authors":"J. Pflüger, M. Von Langsdorff, C. Breitsamter ","doi":"10.3389/fpace.2022.975600","DOIUrl":"https://doi.org/10.3389/fpace.2022.975600","url":null,"abstract":"The wide field of applications is the driving force behind the scientific interest in unmanned and micro air vehicles. For these aircraft, morphing wing technologies offer the possibility to adapt the aerodynamics to different flight stages. A morphing wing configuration with two elasto-flexible membrane wings is investigated numerically at a low Reynolds number of Re = 264000. The concept enables wing folding over a wide range and it allows the wing to adapt to changing aerodynamic loads. The focus is set on the benefits of the membrane in the high lift regime. Therefore, fluid-structure-interaction simulations are performed for the model equipped with a flexible and with a rigid wing. The comparison of the numerical results to data from previous experimental measurements show a good agreement. Compared with the rigid wing, the elasto-flexible membrane increases the gradient in the linear region and the maximum lift coefficient. In addition, the maximum lift coefficient is shifted to higher angles of attack. For selected wing positions and angles of attack, the aerodynamic behavior of the flexible and the rigid wing are investigated by means of the lift coefficient, the deformation of the membrane, the wall shear stresses and the wing surface pressure distribution. The deformation of the wing surface directly influences the area of flow separation at the extended wing and the separating leading-edge vortex at the folded wing. Both effects increase the generated lift of the wing with a flexible membrane.","PeriodicalId":365813,"journal":{"name":"Frontiers in Aerospace Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124183729","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

Minimal length multi-segment clothoid return paths for vehicles with turn rate constraints 具有转弯率约束的车辆的最小长度多段线型返回路径

Frontiers in Aerospace Engineering Pub Date : 2022-10-10 DOI: 10.3389/fpace.2022.982808

Theodore Tuttle, Jay Wilhelm

引用次数: 1

Grand challenges in aerospace propulsion 航天推进的巨大挑战

Frontiers in Aerospace Engineering Pub Date : 2022-09-15 DOI: 10.3389/fpace.2022.1027943

M. Oehlschlaeger

{"title":"Grand challenges in aerospace propulsion","authors":"M. Oehlschlaeger","doi":"10.3389/fpace.2022.1027943","DOIUrl":"https://doi.org/10.3389/fpace.2022.1027943","url":null,"abstract":"Aerospace propulsion technologies are well established and commercialized for lowspeed to supersonic air flight, payload launch to space, and missions within space. However, present aerospace propulsion systems have a number of shortcomings, including their environmental impact, performance, and mission capabilities, which represent grand challenges to the aerospace engineering research and development communities. These and other shortcomings will need to be addressed through fundamental and applied research that seeks to improve current technologies and develop understanding of the underlying physics, new engineering methods, and new aerospace propulsion concepts and technologies. With increased public interest in aerospace engineering, resulting from the wide access to air travel and increased number of space launches per year, and the increased economic activity and opportunity for scientific discovery that these activities have provided, the field of aerospace propulsion has a bright future. The grand challenges that our field faces, described in part here, offer great opportunities for the current and future generation of researchers. The Energetics and Propulsion section of Frontiers in Aerospace Engineering looks forward to supporting and disseminating research that addresses the current and future challenges in aerospace propulsion and energetics.","PeriodicalId":365813,"journal":{"name":"Frontiers in Aerospace Engineering","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131811702","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: 1

Structural energy storage composites for aviation applications 航空用结构储能复合材料

Frontiers in Aerospace Engineering Pub Date : 2022-09-09 DOI: 10.3389/fpace.2022.1002258

Kit-Ying Chan, B. Demir, K. Lau, Xisheng Shen

引用次数: 0

Design and test a converging and de Laval nozzle using additive manufacturing 使用增材制造设计和测试一个会聚和德拉瓦尔喷嘴

Frontiers in Aerospace Engineering Pub Date : 2022-08-22 DOI: 10.3389/fpace.2022.951987

Mingtai Chen, Ruksana Baby , Seth Dillard , Yi Tsung Lee , Srinath Ekkad

引用次数: 1