AIAA Journal最新文献_第9页

Multifidelity Methodology for Reduced-Order Models with High-Dimensional Inputs 具有高维输入的降序模型的多保真度方法学

IF 2.5 3区工程技术

AIAA Journal Pub Date : 2024-07-23 DOI: 10.2514/1.j064110

Bilal Mufti, Christian Perron, Dimitri N. Mavris

引用次数: 0

Unsteady Pressure Gradients in Wind Tunnels with Time-Varying Freestreams 具有时变自由流的风洞中的非稳态压力梯度

IF 2.1 3区工程技术

AIAA Journal Pub Date : 2024-07-15 DOI: 10.2514/1.j063971

D. Gloutak, Daniel Eichner, Jaylon McGhee, Kenneth E. Jansen, John A. Farnsworth

引用次数: 0

Dynamic Model Reduction for Viscously Damped Structures with Statically Determinate Interfaces 具有静力确定界面的粘性阻尼结构的动态模型还原

IF 2.1 3区工程技术

AIAA Journal Pub Date : 2024-07-15 DOI: 10.2514/1.j064199

Lian-Kai Xu, Wei Wang, Wang-Bai Pan, Guo-An Tang

{"title":"Dynamic Model Reduction for Viscously Damped Structures with Statically Determinate Interfaces","authors":"Lian-Kai Xu, Wei Wang, Wang-Bai Pan, Guo-An Tang","doi":"10.2514/1.j064199","DOIUrl":"https://doi.org/10.2514/1.j064199","url":null,"abstract":"A novel model reduction method for viscously damped structures with statically determinate interfaces, such as spacecraft flexible appendages, is proposed. The paper presents a derivation of the complete complex modal expansion of the interface dynamic stiffness of these structures. Based on the identity relation for all complex modes, which is obtained during the derivation, it is found that the interface acceleration impedance can be expressed as a rational fraction with high accuracy using only low-order complex modes. Using this rational fraction as an approximation model, numerical results of the frequency response can be fitted. The fitted interface acceleration impedance can be applied to real-time control as a reduced model in the form of a transfer function. Furthermore, it can be transformed into the form of system matrices by introducing auxiliary variables, which then participate in the dynamic analysis of the assembly. The reduction process circumvents complex modal analysis and necessitates only the results of frequency responses. Thanks to the powerful ability of conventional finite element software to perform frequency response analysis, this reduction method can be used for large-scale complex models in actual engineering applications.","PeriodicalId":7722,"journal":{"name":"AIAA Journal","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141646641","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

Closed-Loop Control of Dynamic Oblique Shock with Arc Plasma 利用电弧等离子体对动态斜向冲击进行闭环控制

IF 2.1 3区工程技术

AIAA Journal Pub Date : 2024-07-15 DOI: 10.2514/1.j064031

Fan Liu, Bo Wang, Hongchao Huang, Hong Yan

{"title":"Closed-Loop Control of Dynamic Oblique Shock with Arc Plasma","authors":"Fan Liu, Bo Wang, Hongchao Huang, Hong Yan","doi":"10.2514/1.j064031","DOIUrl":"https://doi.org/10.2514/1.j064031","url":null,"abstract":"The fluctuations caused by the dynamic shock wave and its interaction with the boundary layer bring formidable challenges for aerodynamic design and stable control of supersonic aircraft. The mechanism of closed-loop control for dynamic oblique shock stabilizing with arc plasma is numerically studied. Two types of dynamic oblique shocks are formed in supersonic airflow by a compression ramp rotation and incoming Mach number variation, respectively. A closed-loop controller is established to connect the arc plasma deposited power with the pressure ratio across the dynamic shock by using the proportional-integral method. It realizes the shock pressure ratio stabilized in the desired target value with a local overshoot appearing at the initial excitation and a more stable flow downstream of the oblique shock during excitation state for both types of dynamic shock control. The effects of arc plasma length and ramp rotating speed on the closed-loop control for the dynamic shocks induced by ramp rotation are further discussed. Results show that the arc plasma with longer length is more favorable to the dynamic oblique shock control with lower energy consumption and total pressure loss. The pressure ratio fluctuation is increased at higher ramp rotation speed, but its standard deviation is still limited to 0.3% of the desired target value during excitation state.","PeriodicalId":7722,"journal":{"name":"AIAA Journal","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141644117","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

Fatigue Assessment of Inclined Film Cooling Holes in Nickel-Based Single-Crystal Superalloy 镍基单晶超级合金斜膜冷却孔的疲劳评估

IF 2.1 3区工程技术

AIAA Journal Pub Date : 2024-07-14 DOI: 10.2514/1.j064178

Huanbo Weng, Cheng Luo, H. Yuan, Yuanxing Gu

引用次数: 0

Introduction to Advancement in Thermal Power Generation and Propulsion with Low/Zero [math] Emission Virtual Collection 低/零[数学]排放火力发电和推进技术进展虚拟文集介绍

IF 2.5 3区工程技术

AIAA Journal Pub Date : 2024-07-09 DOI: 10.2514/1.j063542@aiaaj.2024.virtual_collection.issue-5

Dan Zhao, Tom I-P. Shih

引用次数: 0

Numerical Investigation of Electrodeless Plasma Thruster with Rotating Electric Field 带旋转电场的无电极等离子体推进器的数值研究