Proceedings of the Vertical Flight Society 76th Annual Forum最新文献_第7页

Findings in Aero-Acoustic Simulations for Optimizations 气动声学优化模拟研究成果

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16495

G. Wilke

引用次数: 3

The Influence of the Wiring Harness on the System Performance of eVTOL Aircraft on the Example of Common Reference Models 以常用参考模型为例分析线束对eVTOL飞机系统性能的影响

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16404

Sebastian Oberschwendtner, M. Hornung

{"title":"The Influence of the Wiring Harness on the System Performance of eVTOL Aircraft on the Example of Common Reference Models","authors":"Sebastian Oberschwendtner, M. Hornung","doi":"10.4050/f-0076-2020-16404","DOIUrl":"https://doi.org/10.4050/f-0076-2020-16404","url":null,"abstract":"\u0000 This paper deals with the influence of the wiring harness on the system performance of electric vertical take-off and landing (eVTOL) aircraft. The architecture and connections of the wiring harness are formalized using graph theory. The adjacency and incidence matrices provided by algebraic graph theory are used to define the harness connections and links. The current flows within the harness are calculated by applying Kirchhoff’s and Ohm's law to the network equations. Three common reference models are used to simulate and optimize different harness architectures. The harness architectures differ in the kind of connection and number of harness links. The optimization is done using two objectives. One objective is to maximize the range of the aircraft. The other objective, to minimize the harness mass, is used to show the performance difference of such a wiring harness. The influence of the system voltage and the take-off mass are examined as well. The results of the optimizations show, that a wiring harness exists for each configuration which maximizes the range of the aircraft. This optimal wiring harness is not the wiring harness with the lowest mass.\u0000","PeriodicalId":293921,"journal":{"name":"Proceedings of the Vertical Flight Society 76th Annual Forum","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128013635","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

Rotor Fault Detection and Identification on a Hexacopter under Varying Flight States Based on Global Stochastic Models 基于全局随机模型的六旋翼机变飞行状态旋翼故障检测与识别

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16275

A. Dutta, M. McKay, F. Kopsaftopoulos, F. Gandhi

{"title":"Rotor Fault Detection and Identification on a Hexacopter under Varying Flight States Based on Global Stochastic Models","authors":"A. Dutta, M. McKay, F. Kopsaftopoulos, F. Gandhi","doi":"10.4050/f-0076-2020-16275","DOIUrl":"https://doi.org/10.4050/f-0076-2020-16275","url":null,"abstract":"\u0000 This work introduces the use of \"global\" stochastic models to detect and identify rotor failures in multicopters under different operating conditions, turbulence, and uncertainty. The identification of an extended class of time-series models known as Vector-dependent Functionally Pooled AutoRegressive models, which are characterized by parameters that depend on both forward velocity and gross weight, using scalar or vector aircraft response signals under white noise excitation has been described. A concise overview of the residual based statistical decision making schemes for fault detection and identification of rotor failures is provided. The scalar and vector statistical models, along with residual variance and residual uncorrelatedness methods were validated and their effectiveness was assessed by a proof-of-concept application to aircraft flight for healthy and faulty states under severe turbulence and intermediate operating conditions. The results of this study demonstrate the effectiveness of all the proposed residual-based time series methods in terms of prompt rotor fault detection, although the methods based on Vector AutoRegressive models exhibit improved performance compared to their scalar counterparts with respect to their performance in identifying rotor failures in the post-failure controller compensated state.\u0000","PeriodicalId":293921,"journal":{"name":"Proceedings of the Vertical Flight Society 76th Annual Forum","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128528100","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: 5

Real-Time Nonlinear Model Predictive Control of a Helicopter in Autorotation 直升机自旋实时非线性模型预测控制

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16394

Brian F. Eberle, J. Rogers

引用次数: 0

Modal Elastic Component Enhancements for RCAS 模态弹性组件增强的RCAS

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16438

M. Hasbun, R. Blumenstein, H. Saberi

引用次数: 1

Bell 505 Automation at Final Assembly - Project Octopus 贝尔505自动化在最后组装-项目章鱼

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16277

Cédric Roche

{"title":"Bell 505 Automation at Final Assembly - Project Octopus","authors":"Cédric Roche","doi":"10.4050/f-0076-2020-16277","DOIUrl":"https://doi.org/10.4050/f-0076-2020-16277","url":null,"abstract":"\u0000 Functional testing of aircraft systems at final assembly has typically been a manually intensive and time consuming process. With the introduction of sophisticated avionics displays, system checkouts require numerous button presses and significant movement of the technicians in and around the aircraft to verify functionality. To accelerate functional testing, the Bell 505 team set out to eliminate most of the tedious steps by developing an easy to use computer assisted tool called \"Octopus\". In the process, the 505 final assembly team was able to take a fresh look at manual procedures and harvest the experience of \"how things have been done\" to create a better way. Working closely with the employees involved in the chain of functional testing steps, the automated process was commissioned. The resulting \"Octopus\" reflects the knowledge and skills of the engineers responsible for creating the functional test procedure and the technician performing the test. Having placed strong emphasis on getting \"every voice heard,\" the Octopus automatically runs through the procedural steps to verify each function of the aircraft avionics system. As a project, the Octopus was able to remove a bottleneck from final assembly and eliminate 20 labor hours in the process.\u0000","PeriodicalId":293921,"journal":{"name":"Proceedings of the Vertical Flight Society 76th Annual Forum","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126618856","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

Investigation of the Interactional Aerodynamics of the XV-15 Tiltrotor Aircraft XV-15倾转旋翼机相互作用空气动力学研究

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16464

S. Tran, Joon W. Lim

{"title":"Investigation of the Interactional Aerodynamics of the XV-15 Tiltrotor Aircraft","authors":"S. Tran, Joon W. Lim","doi":"10.4050/f-0076-2020-16464","DOIUrl":"https://doi.org/10.4050/f-0076-2020-16464","url":null,"abstract":"\u0000 The high fidelity computational fluid dynamics (CFD) tool CREATE™-AV HELIOS is used to investigate the interactional aerodynamics of the XV-15 tiltrotor in this work. The full vehicle is studied in a quasi-static manner with various airspeeds, nacelle angles, and vehicle attitudes to simulate hover-to-forward flight transition. The rotor is trimmed using CFD/CSD coupling with CAMRADII. Significant wing-on-rotor interactions are observed where the thickness and loading effects of the wing create an impulsive doublet loading on the rotor as it passes over the wings. Furthermore, the wing is shown to alter the blade-vortex interactions of the rotor at high nacelle angles. The rotor in turn noticeably alters the lift and drag characteristics of the wing. At moderate to low nacelle angles, the rotor downwash enhances the dynamic pressure primarily on the upper surface of the wing, increasing the wing lift by up to 13%. The effect on the drag varies depending on the nacelle angle. At high nacelle angles, the rotor is shown to decrease the both lift and drag of the wing by 15%. Overall, this work serves to illuminate and quantify some of the complex aerodynamic interactions that occur during the conversion maneuver of tiltrotor aircraft.\u0000","PeriodicalId":293921,"journal":{"name":"Proceedings of the Vertical Flight Society 76th Annual Forum","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126144614","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: 4

U.S. Army Rotary-wing Airframe Defect Trending, Modeling, and Analysis 美国陆军旋转翼机身缺陷趋势、建模和分析

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16313

Jared Peltier, Prasant Chhotu

引用次数: 0

Fatigue Life Improvement in Hierarchically Organized Nanocomposites for Application to Rotorcrafts 用于旋翼飞机的分层组织纳米复合材料的疲劳寿命改进

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16355

Mithil Kamble, N. Koratkar, A. Lakhnot, C. Picu

{"title":"Fatigue Life Improvement in Hierarchically Organized Nanocomposites for Application to Rotorcrafts","authors":"Mithil Kamble, N. Koratkar, A. Lakhnot, C. Picu","doi":"10.4050/f-0076-2020-16355","DOIUrl":"https://doi.org/10.4050/f-0076-2020-16355","url":null,"abstract":"\u0000 Carbon fiber reinforced polymer composites (CFRP) are extensively used as structural components in rotorcraft applications. Here, we report considerable improvement in the fatigue life of CFRP through the infiltration of nanoscale silica particles into the epoxy resin matrix (nanoCFRP). Fumed silica nanoparticles were initially added to the epoxy resin to prepare epoxy-silica nanocomposites, which were demonstrated to have superior fracture and fatigue properties. Fractographic analysis indicated presence of various key toughening mechanisms including crack deflection, plastic void growth as well as a hitherto unreported heterogeneity induced mesoscale toughening effect. The epoxy-silica nanocomposite resin was then used as the matrix material to fabricate nanoCFRP. Cyclic flexural bending tests indicate significant fatigue life enhancement for the nanoCFRP. The enhancement is especially pronounced in the high cycle fatigue regime. This enhancement in high cycle fatigue is indicative of transfer of small-scale toughening mechanisms from the silica-epoxy nanocomposite resin to the nanoCFRP system. Such nanoCFRP show promise to improve the fatigue life and reduce the operational/maintenance cost for next generation rotorcraft.\u0000","PeriodicalId":293921,"journal":{"name":"Proceedings of the Vertical Flight Society 76th Annual Forum","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126347775","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

UAV Dynamics and Electric Power System Modeling and Visualization using Modelica and FMI 基于Modelica和FMI的无人机动力学与电力系统建模与可视化

Proceedings of the Vertical Flight Society 76th Annual Forum Pub Date : 2020-10-05 DOI: 10.4050/f-0076-2020-16289

Meaghan Podlaski, L. Vanfretti, H. Nademi, Hao-Hsiang Chang

引用次数: 1