Chinese Journal of Aeronautics最新文献_第9页

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IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/S1000-9361(23)00384-9

引用次数: 0

A novel Bayesian-based INS/GNSS integrated positioning method with both adaptability and robustness in urban environments 基于贝叶斯的新型 INS/GNSS 综合定位方法，兼具城市环境中的适应性和鲁棒性

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.11.024

Zhe Yang, Hongbo Zhao

引用次数: 0

Investigation of influence of local cooling/heating on nonlinear instability of high-speed boundary layer with direct numerical simulations 局部冷却/加热对高速边界层非线性不稳定性影响的直接数值模拟研究

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.07.017

Teng ZHOU, Yuhan LU, Chao YAN

{"title":"Investigation of influence of local cooling/heating on nonlinear instability of high-speed boundary layer with direct numerical simulations","authors":"Teng ZHOU, Yuhan LU, Chao YAN","doi":"10.1016/j.cja.2023.07.017","DOIUrl":"10.1016/j.cja.2023.07.017","url":null,"abstract":"<div><p>The influence of local cooling/heating on two types of nonlinear instabilities of the high-speed boundary layer, namely, the First and Second Mode Oblique Breakdown (FMOB and SMOB), is studied using direct numerical simulations. Local cooling and heating are performed at the weak and strong nonlinear stages of the two types of nonlinear instabilities. It is found that for the FMOB, local cooling at the weak nonlinear region will suppress the increase of the fundamental mode, leading to transition delay. Opposite to local cooling, local heating at the weak nonlinear region of the FMOB will promote the growth of the fundamental mode, resulting in the occurrence of more upstream transition onset. However, if local cooling and heating are performed at the strong nonlinear region, the influence of both local cooling and heating on the FMOB can be neglected. Remarkably, both local heating and cooling can delay the SMOB for different mechanisms. Performing local cooling at the weak nonlinear region of the SMOB, the low amplitude of higher spanwise wavenumber steady mode caused by local cooling lies behind transition delay. When local cooling is set at the strong nonlinear region, the low amplitude of harmonic modes around the cooling area can cause transition delay. Additionally, local heating will suppress the SMOB for the slowing amplification rate of various modes caused by the local heating at both the weak and strong nonlinear stages of the SMOB.</p></div>","PeriodicalId":55631,"journal":{"name":"Chinese Journal of Aeronautics","volume":"36 12","pages":"Pages 77-87"},"PeriodicalIF":5.7,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1000936123002479/pdfft?md5=acece91d57323c6bdad6b034cd20ae45&pid=1-s2.0-S1000936123002479-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49007018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robust gain-scheduled missile autopilot design based on multifrequency extended state observers 基于扩展状态观测器的鲁棒增益调度导弹自动驾驶仪设计

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.07.028

Zonghua SUN, Liaoni WU, Yancheng YOU

{"title":"Robust gain-scheduled missile autopilot design based on multifrequency extended state observers","authors":"Zonghua SUN, Liaoni WU, Yancheng YOU","doi":"10.1016/j.cja.2023.07.028","DOIUrl":"10.1016/j.cja.2023.07.028","url":null,"abstract":"<div><p>This paper describes the design and implementation of a three-axis acceleration control autopilot for an asymmetric tail-controlled, skid-to-turn tactical missile. In an earlier flight test, degraded autopilot performance was attributed to multiple disturbances and uncertainties and the presence of hidden coupling terms, giving rise to a miss distance of greater than 20 m. To address these issues, the missile dynamics are decomposed into the angular rate dynamics as fast and the acceleration dynamics as slow subsystem using the singular perturbation theory to analyze a multi-time-scale property. Multifrequency extended state observers are then incorporated into the gain scheduling technique to attenuate disturbances, thus enhancing the control performance significantly. In the proposed engineering/practical design framework for missile autopilot, simple, conventional, and explicit tuning rules are provided. And the proposed control scheme can achieve input-to-state stability across the entire flight envelope under unknown but bounded disturbances. The advantages of the method over existing benchmark approaches are shown through nonlinear numerical simulations. This is supported by evidence from a new flight test result with a miss distance of only 2 m.</p></div>","PeriodicalId":55631,"journal":{"name":"Chinese Journal of Aeronautics","volume":"36 12","pages":"Pages 390-407"},"PeriodicalIF":5.7,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1000936123002649/pdfft?md5=4c29e9e7216080adeafc5020dc8f5f96&pid=1-s2.0-S1000936123002649-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49063631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser welding process and strength enhancement of carbon fiber reinforced thermoplastic composites and metals dissimilar joint: A review 碳纤维增强热塑性复合材料与金属异种接头激光焊接工艺及强度增强研究进展

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.02.025

Junke JIAO , Jihao XU , Chenghu JING , Liyuan SHENG , Haolei RU , Hongbo XIA

{"title":"Laser welding process and strength enhancement of carbon fiber reinforced thermoplastic composites and metals dissimilar joint: A review","authors":"Junke JIAO , Jihao XU , Chenghu JING , Liyuan SHENG , Haolei RU , Hongbo XIA","doi":"10.1016/j.cja.2023.02.025","DOIUrl":"10.1016/j.cja.2023.02.025","url":null,"abstract":"<div><p>Carbon fiber reinforced thermoplastic composites (CFRTP) and metals hybrid structures have been widely used in aircraft lightweight manufacturing. However, due to the significant difference in physical and chemical properties between CFRTP and metals, there are lots of challenges to connect them with high quality. Laser welding has a good application prospect in CFRTP and metals connection, and a significant research progress has been made in the exploration of CFRTP-metal laser joining mechanism, joining process optimization, joining strength improvement and joining defects controlling. However, there are still some problems need to be solved for this technology application. In this paper, the research progress of CFRTP-metal laser joining was summarized in three major aspects: theoretical modeling and simulation analysis, process exploration and parameter optimization, joint performance improvement and process innovation. And, problems and challenges of this technology were discussed, and the outlook of this research was provided.</p></div>","PeriodicalId":55631,"journal":{"name":"Chinese Journal of Aeronautics","volume":"36 12","pages":"Pages 13-31"},"PeriodicalIF":5.7,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1000936123000468/pdfft?md5=bfda36619613f3759ecf955b00a8d990&pid=1-s2.0-S1000936123000468-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47063620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Rigorous and integrated self-calibration model for a large-field-of-view camera using a star image 基于星图的大视场相机严格集成自标定模型

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.06.013

Yinhu ZHAN, Shaojie CHEN, Chao ZHANG, Ruopu WANG

{"title":"Rigorous and integrated self-calibration model for a large-field-of-view camera using a star image","authors":"Yinhu ZHAN, Shaojie CHEN, Chao ZHANG, Ruopu WANG","doi":"10.1016/j.cja.2023.06.013","DOIUrl":"10.1016/j.cja.2023.06.013","url":null,"abstract":"<div><p>This paper proposes a novel self-calibration method for a large-FoV (Field-of-View) camera using a real star image. First, based on the classic equisolid-angle projection model and polynomial distortion model, the inclination of the optical axis is thoroughly considered with respect to the image plane, and a rigorous imaging model including 8 unknown intrinsic parameters is built. Second, the basic calibration equation based on star vector observations is presented. Third, the partial derivative expressions of all 11 camera parameters for linearizing the calibration equation are deduced in detail, and an iterative solution using the least squares method is given. Furtherly, simulation experiment is designed, results of which shows the new model has a better performance than the old model. At last, three experiments were conducted at night in central China and 671 valid star images were collected. The results indicate that the new method obtains a mean magnitude of reprojection error of 0.251 pixels at a 120° FoV, which improves the calibration accuracy by 38.6% compared with the old calibration model (not considering the inclination of the optical axis). When the FoV drops below 20°, the mean magnitude of the reprojection error decreases to 0.15 pixels for both the new model and the old model. Since stars instead of manual control points are used, the new method can realize self-calibration, which might be significant for the long-duration navigation of vehicles in some unfamiliar or extreme environments, such as those of Mars or Earth’s moon.</p></div>","PeriodicalId":55631,"journal":{"name":"Chinese Journal of Aeronautics","volume":"36 12","pages":"Pages 375-389"},"PeriodicalIF":5.7,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1000936123001991/pdfft?md5=cf37848223c6c084bb3b7ac54df5d98a&pid=1-s2.0-S1000936123001991-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41330902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strict finite-time sliding mode control for a tethered space net robot 系留空间网机器人的严格有限时间滑模控制

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.07.027

Chen WANG , Fan ZHANG

{"title":"Strict finite-time sliding mode control for a tethered space net robot","authors":"Chen WANG , Fan ZHANG","doi":"10.1016/j.cja.2023.07.027","DOIUrl":"10.1016/j.cja.2023.07.027","url":null,"abstract":"<div><p>Tethered Space Net Robot (TSNR) is considered to be a promising approach for space debris removal, and accordingly it is also an interesting control problem due to its time-varying disturbances caused by an elastic and flexible net and a main connected tether. In this situation, the control scheme should be robust enough, low-frequency, and finite-time convergent in presence of external disturbances. In this paper, a robust controller with an advanced adaptive scheme is proposed. To improve robustness, the disturbance is skillfully involved in the adaptive scheme. It is strictly proven that the closed-loop system can converge to the desired trajectory in finite time in both reaching and sliding processes. Based on the theoretical proof, adaptive gains and corresponding dynamic stability characteristics are further discussed. Finally, the efficiency of the proposed control scheme is numerically proven via a TSNR. The proposed control scheme utilizes small and continuous control forces to compensate for the disturbance efficiently and track the desired trajectory quickly.</p></div>","PeriodicalId":55631,"journal":{"name":"Chinese Journal of Aeronautics","volume":"36 12","pages":"Pages 325-335"},"PeriodicalIF":5.7,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1000936123002571/pdfft?md5=85a28cacbdc04008c5a62f53546c8738&pid=1-s2.0-S1000936123002571-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48385761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forming process chain for manufacturing complex conical-section profiled rings: On a co-design method 用于制造复杂锥形截面异型环的成型工艺链：共同设计方法

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.12.024

Lei Liang, Chaojiang Zou, Lianggang Guo

引用次数: 0

Topology optimization of modular structures with multiple assemblies and applications to airborne shelves 多组件模块结构拓扑优化及机载货架应用

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.12.014

Jie Wang, T. Gao, Ming Li, Jihong Zhu, Longlong Song, Weihong Zhang

引用次数: 0

Design-space adaptation method for multiobjective and multidisciplinary optimization 多目标和多学科优化的设计空间适应方法

IF 5.7 1区工程技术

Chinese Journal of Aeronautics Pub Date : 2023-12-01 DOI: 10.1016/j.cja.2023.12.029

Jongho Jung, Kwanjung Yee, Shinkyu Jeong

引用次数: 0