International Journal of Aerospace Engineering最新文献_第5页

Strain Prediction of Grain in Solid Rocket Motor under the Pressure Curing Molding Technology 压力固化成型技术下固体火箭发动机晶粒的应变预测

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-23 DOI: 10.1155/2023/8107966

Kaining Zhang, Chunguang Wang, Qun Li, Zhenyu Guo

{"title":"Strain Prediction of Grain in Solid Rocket Motor under the Pressure Curing Molding Technology","authors":"Kaining Zhang, Chunguang Wang, Qun Li, Zhenyu Guo","doi":"10.1155/2023/8107966","DOIUrl":"https://doi.org/10.1155/2023/8107966","url":null,"abstract":"The residual strain generated in grains during the propellant manufacturing process can significantly impact the safety and stability of solid rocket motors. Pressure curing molding technology has been employed as an effective approach to mitigate residual strain. This research paper focuses on deriving a strain prediction function for grains based on continuum mechanics, taking into account the influence of pressure curing molding technology. The accuracy of the prediction function is verified through finite element analysis. The results show that the proposed function accurately predicts strain distribution at critical positions within the grains. And the effects of curing pressure and the elastic modulus of the case on residual strain are analysed. Specifically, for a given material of case, an optimal curing pressure is identified that minimizes residual strain in the grains. Moreover, it is observed that materials with lower hoop elastic modulus, such as composites, tend to require lower optimal curing pressures. The outcomes of this study provide valuable guidance for grain shape design and the selection of optimal curing pressure.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":"12 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139030451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Adaptive Distributed Fixed-Time Cooperative Three-Dimensional Guidance Law for Multimissiles against Manoeuvring Target 针对机动目标的多导弹自适应分布式固定时间合作三维制导法

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-21 DOI: 10.1155/2023/4692840

Jiwei Gao, Xiaojing Li, Shaofei Zang, Jianwei Ma, Jinpeng Zhang

引用次数: 0

Numerical Simulations of Vertical Discrete Gusts Driven by Trailing Edge Blowing 由后缘吹风驱动的垂直离散阵风的数值模拟

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-20 DOI: 10.1155/2023/5520443

Yang Shi, Bo Lu, Peng Guo, Binbin Lv, Hongtao Guo, Li Yu

{"title":"Numerical Simulations of Vertical Discrete Gusts Driven by Trailing Edge Blowing","authors":"Yang Shi, Bo Lu, Peng Guo, Binbin Lv, Hongtao Guo, Li Yu","doi":"10.1155/2023/5520443","DOIUrl":"https://doi.org/10.1155/2023/5520443","url":null,"abstract":"A new type of gust generator generates the airflow oscillation in the wind tunnel through the Coanda effect of the unsteady trailing edge blowing, which has been shown to have strong potential for accurately simulating discrete gusts. It is necessary to study the relationship between the generated gust characteristics and the control parameters of such devices in order to optimize the design performance and improve gust simulation capabilities. By solving the compressible unsteady Reynolds-averaged Navier–Stokes (URANS) equations, the computational fluid dynamics model of the subsonic airflow past the gust generator in the wind tunnel was presented. The effects of jet momentum, frequency, and spanwise blowing ratio on gust intensity, shape, and spatial uniformity were investigated. Results indicate that the intensity of gusts is positively correlated with jet momentum and frequency. The gust shape matches well with the normalized jet momentum coefficient curve. However, when the frequency increases to above 10 Hz, the gust shape differs significantly from expectation due to the appearance of reverse wave peaks. In addition, the mechanism of the impact of the sidewall and partial spanwise blowing on gusts was revealed. In the three-dimensional situation, streamwise vortices are formed on the sidewall and at the spanwise position where the blowing stops, respectively. This results in an increase and noticeable nonuniformity in gust amplitude. When the blowing with a 15% spanwise length near the sidewall is turned off, the gust amplitude at the symmetry plane increases by nearly 40% due to the main vortex being closer to the main flow. The result provides a physical explanation for the availability of this operation to reduce gust attenuation.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":"57 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138821122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications 基于脉冲星矢量观测的 X 射线通信链路获取方法

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-14 DOI: 10.1155/2023/5541338

Shibin Song, Xiao Lu, Haixia Wang

引用次数: 0

An Efficient Trajectory Negotiation and Verification Method Based on Spatiotemporal Pattern Mining 基于时空模式挖掘的高效轨迹协商与验证方法

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-12 DOI: 10.1155/2023/5530977

Yongqi Liu, Miao Wang, Zhaohua Zhong, Kelin Zhong, Guoqing Wang

{"title":"An Efficient Trajectory Negotiation and Verification Method Based on Spatiotemporal Pattern Mining","authors":"Yongqi Liu, Miao Wang, Zhaohua Zhong, Kelin Zhong, Guoqing Wang","doi":"10.1155/2023/5530977","DOIUrl":"https://doi.org/10.1155/2023/5530977","url":null,"abstract":"In trajectory-based operations, trajectory negotiation and verification are conducive to using airspace resources fairly, reducing flight delay, and ensuring flight safety. However, most of the current methods are based on route negotiation, making it difficult to accommodate airspace user-initiated trajectory requests and dynamic flight environments. Therefore, this paper develops a framework for trajectory negotiation and verification and describes the trajectory prediction, negotiation, and verification processes based on a four-dimensional trajectory. Secondly, users predict flight trajectories based on aircraft performance and flight plans and submit them as requested flight trajectories to the air traffic management (ATM) system for negotiation in the airspace. Then, a spatiotemporal weighted pattern mining algorithm is proposed, which accurately identifies flight combinations that violate the minimum flight separation constraint from four-dimensional flight trajectories proposed by users, as well as flight combinations with close flight intervals and long flight delays in the airspace. Finally, the experimental results demonstrate that the algorithm efficiently verifies the user-proposed flight trajectory and promptly identifies flight conflicts during the trajectory negotiation and verification processes. The algorithm then analyzes the flight trajectories of aircrafts by applying various constraints based on the specific traffic environment; the flight combinations which satisfy constraints can be identified. Then, based on the results identified by the algorithm, the air traffic management system can negotiate with users to adjust the flight trajectory, so as to reduce flight delay and ensure flight safety.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":"18 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138575746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Distributed Formation Control with Obstacle and Collision Avoidance for Hypersonic Gliding Vehicles Subject to Multiple Constraints 高超音速滑翔飞行器的分布式编队控制与障碍物和碰撞规避

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-12 DOI: 10.1155/2023/9973653

Zhen Zhang, Yifan Luo, Yaohong Qu

{"title":"Distributed Formation Control with Obstacle and Collision Avoidance for Hypersonic Gliding Vehicles Subject to Multiple Constraints","authors":"Zhen Zhang, Yifan Luo, Yaohong Qu","doi":"10.1155/2023/9973653","DOIUrl":"https://doi.org/10.1155/2023/9973653","url":null,"abstract":"Multiple hypersonic gliding vehicles’ (HGVs’) formation control problems with obstacle and collision avoidance are investigated in this paper, which is addressed in the stage of entry gliding. The originality of this paper stems from the formation control algorithm where constraints of dynamic pressure, heating rate, total aerodynamic load, control inputs, collision avoidance, obstacle avoidance, and the terminal states are considered simultaneously. The algorithm implements a control framework designed to be of two terms: distributed virtual controller and actual control input solver. The distributed virtual controller is based on distributed model predictive control with synchronous update strategy, where the virtual control signals are derived by the optimization simultaneously at each time step for each HGV under directed communication topology. Subsequently, according to the virtual control signals obtained, a coupled nonlinear equation set is solved to get actual control signals: each HGV’s bank angle together with the angle of attack. The actual control input solver adopts a feasible solution process to calculate the actual control signals while dealing with constraints. Finally, extensive numerical simulations are implemented to unveil the proposed algorithm’s performance and superiority.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":"154 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138575744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Aerodynamic Analysis of a Logistics UAV with Foldable Bi-wing Configuration 可折叠双翼物流无人机气动特性分析

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-12-05 DOI: 10.1155/2023/3304048

Xiaolu Wang, Wenlong Lu, Weiwei Liu, Changning Chen, Liangyu Zhao

{"title":"Aerodynamic Analysis of a Logistics UAV with Foldable Bi-wing Configuration","authors":"Xiaolu Wang, Wenlong Lu, Weiwei Liu, Changning Chen, Liangyu Zhao","doi":"10.1155/2023/3304048","DOIUrl":"https://doi.org/10.1155/2023/3304048","url":null,"abstract":"Herein, a twin-boom, inverted V-tailed unmanned aerial vehicle (UAV) featuring a foldable bi-wing configuration is proposed for logistics and transportation applications. We employed the Navier–Stokes solver to numerically simulate steady, incompressible flow conditions. By examining the effects of key design parameters on aerodynamic characteristics and bypass flow fields in a two-dimensional state, we were able to suggest a more optimized foldable wing design. Building on the two-dimensional analysis, we performed aerodynamic assessments of the three-dimensional aircraft geometry. Our results indicated that appropriate wing and gap parameters can significantly enhance lift characteristics, maintaining high lift even during large-angle flights. Specifically, when compared to a mono-wing, the lift coefficient of the bi-wing increased by 27.1% at a 14° angle of attack, demonstrating the effectiveness of our wing-and-gap design. Optimal aerodynamic performance was achieved when the gap distance equalled the chord length in both flow and vertical directions. Further, the right combination of airfoil configuration, wing axes angle, and wingspan can improve flow field aerodynamic characteristics, while also enhancing the wing’s stall capacity. The lift coefficient reached its maximum value at an angle of attack of 15°, which has the potential to reduce takeoff and landing distances, thereby enhancing the UAV’s overall safety.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" 4","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138493035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Two-Level Iterative Node Importance Evaluation of Aircraft Function Modules Based on Influence Matrix 基于影响矩阵的飞机功能模块两级迭代节点重要性评估

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-11-22 DOI: 10.1155/2023/2316511

Chang Liu, Jinyan Wang, Kangxing Wang

引用次数: 0

Flow-Based 6D Pose Tracking of Uncooperative Spacecrafts 基于流的非合作航天器6D姿态跟踪

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-11-22 DOI: 10.1155/2023/9631895

Yu Su, Zexu Zhang, Mengmeng Yuan, Yishi Wang

引用次数: 0

Research on Image Super-Resolution Reconstruction Technology Based on Unsupervised Learning 基于无监督学习的图像超分辨率重建技术研究