Aerospace Systems最新文献_第5页

Numerical studies on uncontrolled and controlled shock wave/boundary layer interactions in hypersonic intake 高超音速进气中的非受控和受控冲击波/边界层相互作用的数值研究

Aerospace Systems Pub Date : 2023-10-31 DOI: 10.1007/s42401-023-00252-3

Dorbala Sai Naga Bharghava, Amit Krishnat Mali, Tamal Jana, Mrinal Kaushik

{"title":"Numerical studies on uncontrolled and controlled shock wave/boundary layer interactions in hypersonic intake","authors":"Dorbala Sai Naga Bharghava, Amit Krishnat Mali, Tamal Jana, Mrinal Kaushik","doi":"10.1007/s42401-023-00252-3","DOIUrl":"10.1007/s42401-023-00252-3","url":null,"abstract":"<div><p>Understanding the phenomenon of Shock Wave/Boundary Layer Interaction (SBLI) is critical in developing hypersonic aircraft as it is associated with several penalties, such as huge total pressure loss, boundary layer separation, tremendous temperature rise, fluctuating pressure, and thermal load. The consequences become severe, particularly at hypersonic speeds. Thus, it is essential to control the occurrence of SBLIs to minimize these repercussions. With this in mind, the current study numerically investigates the efficacy of an array of Micro-Vortex Generators (MVGs) placed upstream and at the interaction region in the Mach 5.7 intake. The computational analysis was performed using the finite volume solver Ansys fluent and a 3-dimensional numerical model. MVGs of three different heights (0.5 mm, 0.7 mm, and 1.0 mm) were considered to understand the detailed impact of MVGs height on controlling interactions. The steady-state analysis was carried out using shear stress transport (SST) <i>k</i>–<i>ω</i> turbulence model. Besides, Delayed Detached Eddy Simulation (DES) combined with SST k-omega is specifically considered for unsteady analysis to observe the flow evolution. The quantitative and qualitative analysis has been conducted by examining the static pressure and velocity distributions over the ramp surface and visualizing the shock structures. A maximum of 9.84% reduction in wall static pressure is observed for the MVGs of 1.0 mm height when stationed at the interaction region. The MVGs of 0.7 mm height, placed upstream of the interaction region, are proved to be more efficient than other MVGs. However, pressure recovery and turbulence intensity are maximum for 0.5 mm MVGs, when deployed upstream of the interaction zone.</p></div>","PeriodicalId":36309,"journal":{"name":"Aerospace Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135870040","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

Doppler collision analysis and mitigation using hybrid approach for NavIC system 基于混合方法的导航系统多普勒碰撞分析与缓解

Aerospace Systems Pub Date : 2023-10-20 DOI: 10.1007/s42401-023-00251-4

P. Sathish, D. Krishna Reddy, V. Lokendra Kumar, A. D. Sarma

{"title":"Doppler collision analysis and mitigation using hybrid approach for NavIC system","authors":"P. Sathish, D. Krishna Reddy, V. Lokendra Kumar, A. D. Sarma","doi":"10.1007/s42401-023-00251-4","DOIUrl":"10.1007/s42401-023-00251-4","url":null,"abstract":"<div><p>Doppler collision has a very important issue in satellite-based navigation systems. Navigation with the Indian Constellation (NavIC) comprises seven operational satellites, among which three are geo-stationary (GEO) satellites, and the rest are geosynchronous satellites. Due to the 'small line of sight velocities' of GEO satellites, estimated ranges suffer from the unique challenge of Doppler collision (DC). In this study, we present an analysis of DC events in both static and dynamic conditions, particularly in aerospace applications. We utilize experimental data acquired from the Indian Regional Navigation Satellite System (IRNSS)-GPS-Satellite Based Augmentation System (SBAS) (IGS) receiver located at a low altitude station to develop algorithms for the prediction, avoidance, and mitigation of DC events. The prediction of DC is based on the moving average method. We have devised an efficient algorithm to avoid the occurrence of DC, considering all possible combinations of IRNSS GEO satellites. Additionally, we perform the mitigation of DC using a proposed hybrid approach that involves both the space segment and user segment. The approach is based on repositioning the IRNSS 1C satellite and varying the loop bandwidth of the Delay Locked Loop (DLL). With the implementation of this proposed hybrid approach, the time duration of DC is reduced by 59.16% in static conditions and 16% in dynamic conditions.</p></div>","PeriodicalId":36309,"journal":{"name":"Aerospace Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135617581","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

Group motion control for UAV swarm confrontation using distributed dynamic target assignment 基于分布式动态目标分配的无人机群对抗群运动控制

Aerospace Systems Pub Date : 2023-10-15 DOI: 10.1007/s42401-023-00250-5

Ziqi Guo, Yuankai Li, Yuan Wang, Lianxing Wang

{"title":"Group motion control for UAV swarm confrontation using distributed dynamic target assignment","authors":"Ziqi Guo, Yuankai Li, Yuan Wang, Lianxing Wang","doi":"10.1007/s42401-023-00250-5","DOIUrl":"10.1007/s42401-023-00250-5","url":null,"abstract":"<div><p>For UAV swarm confrontation, group motion control is the key of UAV swarm to accomplish the assigned task, in which target assignment is the premise of group movement of UAVs. Most of the target assignment algorithms used in the traditional unmanned aerial vehicle (UAV) swarm confrontation are centralized, which can match and optimize targets in the static environment of limited aircraft units. However, many limitations will be generated if applied to the dynamic confrontation tasks of large-scale UAV clusters. Moreover, the countermeasures of the traditional UAV swarm countermeasure model are relatively simple and not suitable for the complex countermeasures task requirements in reality. To solve the above problems, a group motion control method using the extend consensus-based bundle algorithm (ECBBA) algorithm is proposed in this paper to carry out the dynamic grouping behavior of UAV swarm. The distributed target assignment algorithm is assembled to improve the efficiency of grouping, supporting the UAV dynamic real-time target assignment, for implementing large-scale group dynamic confrontation. The proposed group motion control strategy of UAV swarm is designed, based on the control of single-group motion and the setting of confrontation behavior. The effectiveness of the proposed ECBBA-based group motion control strategy is verified by simulation experiments.</p></div>","PeriodicalId":36309,"journal":{"name":"Aerospace Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136185264","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

Unerroric of assessment of professional competence for aviation personnel 航空人员专业能力评估的误差

Aerospace Systems Pub Date : 2023-10-13 DOI: 10.1007/s42401-023-00249-y

Andrey E. Sorokin, Adeliya Yu. Burova

{"title":"Unerroric of assessment of professional competence for aviation personnel","authors":"Andrey E. Sorokin, Adeliya Yu. Burova","doi":"10.1007/s42401-023-00249-y","DOIUrl":"10.1007/s42401-023-00249-y","url":null,"abstract":"<div><p>The questions connected with automation of testing of professional skills for aviation personnel on aircraft on-board facilities taking into account psychophysiological peculiarities of all tested persons are considered. The aim of the study is to find additional means of tightening the quality control of professional training for aviation personnel, taking into account the psychophysiological aspect of this control. To achieve the above-mentioned goal, the issues of tightening control for aviation personnel competence level during their training on computer simulators in conditions as close as possible to the real operating conditions of aviation equipment were solved. The research material is the obtained and processed information about the number of recorded changes in operating conditions of aviation equipment, the maximum speed for aviation personnel reaction to changes in its operating conditions, the median speed for aviation personnel reaction to changes in these conditions, the minimum speed of its reaction to changes in the same conditions, the number of decisions made by aviation personnel, the number of correctly made decisions, the number of incorrectly made decisions, and the maximum speed of decision-making by aviation personnel. In the process of research, the procedures of directed enumeration and comparative analysis for aviation personnel training results on computer simulators. When conducting the research, methods of software and hardware-software modeling for aviation personnel operation procedures on aircraft on-board facilities were used. The use of the so-called FLIGHTESTS as a set of individual tasks with control questions and electronic forms for the report on the performance of these tasks and answers to control questions is proposed. These FLIGHTESTS can and should be considered the basis for unerroric to assess the professional competence for aviation personnel. This unerroric will provide additional opportunities to tighten the quality control of professional training for aviation personnel.</p></div>","PeriodicalId":36309,"journal":{"name":"Aerospace Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135853652","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

Transient state flow and heat transfer performance over the flat tip of HP turbine 高压涡轮机平顶上的瞬态流动和传热性能

Aerospace Systems Pub Date : 2023-09-12 DOI: 10.1007/s42401-023-00247-0

Jiuchun Li, Jinfang Teng, Shaopeng Lu

引用次数: 0

Integrity performance characterization of BeiDou B1C and B2a signal-in-space error 北斗B1C和B2a空间信号误差的完整性性能表征

Aerospace Systems Pub Date : 2023-09-11 DOI: 10.1007/s42401-023-00248-z

Liying Huo, Jiawen Shen, Shizhuang Wang, Yawei Zhai, Xingqun Zhan

{"title":"Integrity performance characterization of BeiDou B1C and B2a signal-in-space error","authors":"Liying Huo, Jiawen Shen, Shizhuang Wang, Yawei Zhai, Xingqun Zhan","doi":"10.1007/s42401-023-00248-z","DOIUrl":"10.1007/s42401-023-00248-z","url":null,"abstract":"<div><p>Global Navigation Satellite System (GNSS) Signal-In-Space (SIS) quality directly affects positioning integrity, which is an important metric for safety–critical applications. BeiDou Global Navigation Satellite System (BDS-3) broadcasts two new signals interoperable with GPS and Galileo, i.e., B1C and B2a. They are expected to serve civil aviation applications, following the Standards and Recommended Practices (SARPs) released by International Civil Aviation Organization (ICAO). Therefore, the SIS accuracy and integrity performance of BDS-3 B1C and B2a are evaluated in this work. The SIS Range Errors (SISREs) are achieved by comparing the broadcast satellite positions and clock offsets derived from Civil Navigation Message (CNAV) with the precise products from International GNSS Service (IGS). Specifically, given that the IGS precise products are referring to the equivalent phase center of BeiDou Regional System (BDS-2) B1I + B3I ionosphere-free combination, Differential Code Bias (DCB) from IGS is applied to realize time synchronization. This synchronization method is also meaningful to different frequencies in other constellations and supports the en-route, approaching, and landing phases. By analyzing 1-year data, an overall SIS characteristic picture of the 18 BDS-3 MEO satellites is presented here. The results show that most BDS-3 satellites are subject to an overbounding User Range Accuracy (URA) of 0.5 m to 0.85 m and a fault probability of <span>(1.4953times {10}^{-5})</span> to <span>(1.1975times {10}^{-4})</span>, with an integrity performance much better than that of BDS-2 and comparable to that of GPS. BDS-3 is now ready to serve civil aviation and other safety–critical applications.</p></div>","PeriodicalId":36309,"journal":{"name":"Aerospace Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135981764","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

Methodology for determining the takeoff mass of all-electric aircraft at the early stages of design 在设计初期确定全电动飞机起飞质量的方法

Aerospace Systems Pub Date : 2023-09-08 DOI: 10.1007/s42401-023-00242-5

Denis Dukhnovskiy

引用次数: 0

Conceptual design for returning KITSAT-1 返回KITSAT-1的概念设计

Aerospace Systems Pub Date : 2023-09-04 DOI: 10.1007/s42401-023-00246-1

Taejin Chung, Yehyun Kim, Songoo Kim, Sejin Kwon

引用次数: 0

Numerical research on near stall characteristics of a transonic axial compressor based on wavelet analysis 基于小波分析的跨音速轴流压缩机近失速特性数值研究

Aerospace Systems Pub Date : 2023-08-28 DOI: 10.1007/s42401-023-00245-2

Kailong Xia, Mingmin Zhu, Junda Feng, Hefang Deng, Xiaoqing Qiang, Jinfang Teng

{"title":"Numerical research on near stall characteristics of a transonic axial compressor based on wavelet analysis","authors":"Kailong Xia, Mingmin Zhu, Junda Feng, Hefang Deng, Xiaoqing Qiang, Jinfang Teng","doi":"10.1007/s42401-023-00245-2","DOIUrl":"10.1007/s42401-023-00245-2","url":null,"abstract":"<div><p>An axial single-stage high-speed test rig is numerically studied in this paper with half-annulus URANS simulations to describe the flow characteristics at the near stall condition. Wavelet analysis is applied to demonstrate the time–frequency characteristics of the near-tip pressure signals captured by the numerical probes at different circumferential and axial positions. The detailed tip flow fields and wavelet transform results are combined to depict the generation and propagation of the spike-type stall inception. According to the wavelet spectrum, characteristic frequencies correspond to the temporal and spatial features of the rotating stall, such as the fluctuation of the shock wave, self-oscillation and propagation of tip leakage vortex et al. Consequently, the detection of typical spike stall inception can be significantly brought forward by identifying the crucial rotating disturbance and its development for the onset of stall inception. Then, the specific tip flow fields are also discussed to reveal the flow mechanism of stall inception evolution, including the leading edge spillage and the trailing edge backflow. Further investigation shows that the stall inception with smooth casing corresponds to the radial separation vortex caused by the tip leading edge spillage, which continues to develop and propagate in the circumferential direction and finally induces the stall.</p></div>","PeriodicalId":36309,"journal":{"name":"Aerospace Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76547884","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

Approach to determine the circulation and vorticity around supersonic airfoil with spoiler 确定带扰流板的超音速机翼周围环流和涡流的方法

Aerospace Systems Pub Date : 2023-08-21 DOI: 10.1007/s42401-023-00244-3

Abrar Hoque, Zahangir Alam, Ashabul Hoque

引用次数: 0