International Journal of Aerospace Engineering最新文献_第10页

Influence of Different Altitudes on the Solid Rocket Contrail Formation in the Near Field 不同高度对固体火箭近场反弹道形成的影响

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-19 DOI: 10.1155/2023/6577249

Peigao Zeng, Yi Jiang, Lina Yang, Ying Yang, Song Yan

{"title":"Influence of Different Altitudes on the Solid Rocket Contrail Formation in the Near Field","authors":"Peigao Zeng, Yi Jiang, Lina Yang, Ying Yang, Song Yan","doi":"10.1155/2023/6577249","DOIUrl":"https://doi.org/10.1155/2023/6577249","url":null,"abstract":"Detecting the infrared characteristics of the contrails is a reasonable approach to tracing the rocket, and the particle properties of the contrails are the basis of the infrared analysis. The conventional numerical approach to obtaining the particle properties is a Euler/Lagrange method or a simple Euler/Euler method, difficultly obtaining more accurate results because it ignores the particle size distribution in parcels or cells. A modified Euler/Euler method is applied to simulate the contrail formation in the near field of a solid rocket motor at different altitudes, which considers the size distribution by adding the first- to second-order particle radius moments based on the simple Euler/Euler method. The simulation results show that the crystals are generated at altitudes from 10 km to 20 km and that the contrails are visible at altitudes from 10 km to 15 km, where the radii of the crystals are from 0.1 μm to 0.3 μm. The visible contrails indicate that aviation vehicles are cruising at altitudes from 10 km to 15 km, and the smaller crystals indicate that the contrails are generated by rockets, not aircraft. Our work can provide important insight for the follow-up infrared analysis of the contrails based on the obtained particle radii.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48463824","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

Modeling and Invulnerability Analysis of Multilayer Air Traffic Network considering Altitude Layer 考虑高度层的多层空中交通网络建模与抗毁性分析

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-16 DOI: 10.1155/2023/6525201

Guangjian Ren, Yin Liu

引用次数: 0

Color UAV Image Edge Detection Based on Improved Fireworks Algorithm 基于改进Fireworks算法的彩色无人机图像边缘检测

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-16 DOI: 10.1155/2023/5430700

Dujin Liu, Bing Liang, Jie Li

{"title":"Color UAV Image Edge Detection Based on Improved Fireworks Algorithm","authors":"Dujin Liu, Bing Liang, Jie Li","doi":"10.1155/2023/5430700","DOIUrl":"https://doi.org/10.1155/2023/5430700","url":null,"abstract":"Image edge detection plays a crucial role in image analysis and recognition. However, when dealing with color images captured by unmanned aerial vehicles (UAVs), there are certain limitations, such as large operations, multiple noise sources, easy distortion, and missing information in edge detection. To address these shortcomings, this study proposes a UAV color image edge detection method based on an enhanced fireworks algorithm. In this method, the color image pixels of the UAV are represented using quaternions. The explosion amplitude formula of the fireworks is divided into two categories based on the mean value of the number of fireworks explosions. For each category, an explosion formula is proposed, and the explosion mutation operator of the fireworks algorithm is improved accordingly. By applying the proposed algorithm, the preliminary edges of a UAV color image are obtained. Additionally, a novel approach for color image edge refinement is introduced. This approach involves classifying the edge points based on their degree of attachment, which leads to the formation of the edges in a UAV color image. Experimental results demonstrate that the algorithm proposed in this study offers several advantages, including fast calculation, strong denoising capability, and high-quality edge detection.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41532878","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

Computational Technique for Crack Propagation Simulation in Viscoelastic Solid Propellant 粘弹性固体推进剂裂纹扩展模拟的计算技术

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-15 DOI: 10.1155/2023/8827953

Qiangqiang Jiang, Xuan-xuan Lv, Huiru Cui, Teng Ma

{"title":"Computational Technique for Crack Propagation Simulation in Viscoelastic Solid Propellant","authors":"Qiangqiang Jiang, Xuan-xuan Lv, Huiru Cui, Teng Ma","doi":"10.1155/2023/8827953","DOIUrl":"https://doi.org/10.1155/2023/8827953","url":null,"abstract":"To further investigate the fracture response in propellant grain, numerical methodology is proposed to cope with crack propagation simulation especially for the mixed mode condition. The numerical discrete scheme of the propellant linear viscoelastic constitutive model is proposed, which provides a key means for the simulation of crack propagation. In order to simulate the cohesive traction distribution on the new crack surface, the extrinsic Park-Paulino-Roesler (PPR) cohesive zone model (CZM) is introduced. To let the crack propagate along any direction determined, element splitting technique and its corresponding topological operations are proposed step by step. Then, computational simulation implementation process is explained in greater detail. Typical fracture problem, single edge-notched tension test (SENT) is solved to demonstrate the efficiency and accuracy of the proposed method. In addition, double edge-notched tension test (DENT) as well as plate tension test with a slant crack is conducted to show the special fracture characters in viscoelastic solid propellant, like time dependence. Computational results reveal that the method proposed can be utilized in further fracture investigation in solid propellant combined with the experimental findings.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45582685","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

Investigation of the Effect of Axial Gap on the Mechanical Response of a Cartridge-Loaded CMDB Propellant Grain under Vibration Loads 轴向间隙对装填CMDB推进剂药柱在振动载荷下力学响应影响的研究

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-15 DOI: 10.1155/2023/2451808

Yiming Zhang, Ning-fei Wang, Xiaoxu Chen, Ran Wang, Long Bai, Jinfeng Dang, Yi Wu

{"title":"Investigation of the Effect of Axial Gap on the Mechanical Response of a Cartridge-Loaded CMDB Propellant Grain under Vibration Loads","authors":"Yiming Zhang, Ning-fei Wang, Xiaoxu Chen, Ran Wang, Long Bai, Jinfeng Dang, Yi Wu","doi":"10.1155/2023/2451808","DOIUrl":"https://doi.org/10.1155/2023/2451808","url":null,"abstract":"In this study, the effect of the axial gap on the mechanical response of a cartridge-loaded propellant grain under vibration loads is investigated. The wide strain rate range of uniaxial compression tests (\u0000 \u0000 1.7\u0000 ×\u0000 \u0000 \u0000 10\u0000 \u0000 \u0000 −\u0000 3\u0000 \u0000 \u0000 ~\u0000 4\u0000 ×\u0000 \u0000 \u0000 10\u0000 \u0000 \u0000 3\u0000 \u0000 \u0000 \u0000 \u0000 \u0000 s\u0000 \u0000 \u0000 −\u0000 1\u0000 \u0000 \u0000 \u0000 ) on the composite modified double base (CMDB) propellant was carried out by using a universal testing machine, a hydraulic testing machine, and a split Hopkinson pressure bar system, respectively. A linear viscoelastic constitutive model of the CMDB propellant was developed by using the experimental measurements. The results show the studied CMDB propellant has a strong strain rate dependence, exhibiting an initial linear elasticity followed by a strain hardening region. The dynamic process of collision between the propellant grain and the motor case in the axial direction induced by vibration loads was simulated with the developed constitutive model by using the finite element method. The effects of the gap size between the propellant grain and the case and the vibration frequency on the mechanical response of the grain were studied. This shows that with a constant vibration frequency, the stress of the grain increases first and then decreases with increasing gap size. Moreover, the stress increases with increasing vibration loads.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43129591","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: 1

Random Error Estimation and Propagation Analysis for Satellites’ Initial Positions 卫星初始位置随机误差估计与传播分析

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-15 DOI: 10.1155/2023/7246520

Huanqin Wu, Maocai Wang, Zhiming Song, Xiaoyu Chen, Guangming Dai

引用次数: 1

Heat Transfer Analysis and Structural Optimization for Spiral Channel Regenerative Cooling Thrust Chamber 螺旋通道蓄热式推力室的传热分析与结构优化

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-14 DOI: 10.1155/2023/8628107

J. Lv, Guanquan Du, Ping Jin, Ruizhi Li

{"title":"Heat Transfer Analysis and Structural Optimization for Spiral Channel Regenerative Cooling Thrust Chamber","authors":"J. Lv, Guanquan Du, Ping Jin, Ruizhi Li","doi":"10.1155/2023/8628107","DOIUrl":"https://doi.org/10.1155/2023/8628107","url":null,"abstract":"There is currently a lack of efficient heat transfer analysis methodologies for spiral channel regenerative cooling that has been increasingly applied in liquid rocket engines. To figure out the heat transfer characteristics of the spiral channel regenerative cooling thrust chamber, a simple 1D method based on the traditional semi-empirical formula after correcting the flow velocity is proposed. The accuracy of this approach is verified by the 3D numerical simulation. The verified method is further used to analyze the distribution of inner wall temperature in the test case and optimize the channel’s parameters. The research shows that the maximum inner wall temperature cooled by the spiral channel is 8.5% lower than that of the straight channel under the same channel size and boundary condition, indicating that the application of the spiral channel significantly improves the cooling effect. In addition, the 1D model combined with the second-order response surface model is employed to optimize the channel width, channel height, pitch, and inner wall thickness aiming for the best cooling effect. The calculated maximum temperature of the inner wall after the structure optimization is 586.6 K, which is 29.8% lower than the initial structure before optimization.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47784729","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

Homing Guidance Law Design against Maneuvering Targets Based on DDPG 基于DDPG的机动目标寻的制导律设计

IF 1.4 4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-06-13 DOI: 10.1155/2023/4188037

Yan Liang, Jin Tang, Zhihui Bai, Kebo Li

{"title":"Homing Guidance Law Design against Maneuvering Targets Based on DDPG","authors":"Yan Liang, Jin Tang, Zhihui Bai, Kebo Li","doi":"10.1155/2023/4188037","DOIUrl":"https://doi.org/10.1155/2023/4188037","url":null,"abstract":"A novel homing guidance law against maneuvering targets based on the deep deterministic policy gradient (DDPG) is proposed. The proposed guidance law directly maps the engagement state information to the acceleration of the interceptor, which is an end-to-end guidance policy. Firstly, the kinematic model of the interception process is described as a Markov decision process (MDP) that is applied to the deep reinforcement learning (DRL) algorithm. Then, an environment of training, state, action, and network structure is reasonably designed. Only the measurements of line-of-sight (LOS) angles and LOS rotational rates are used as state inputs, which can greatly simplify the problem of state estimation. Then, considering the LOS rotational rate and zero-effort-miss (ZEM), the Gaussian reward and terminal reward are designed to build a complete training and testing simulation environment. DDPG is used to deal with the RL problem to obtain a guidance law. Finally, the proposed RL guidance law’s performance has been validated using numerical simulation examples. The proposed RL guidance law demonstrated improved performance compared to the classical true proportional navigation (TPN) method and the RL guidance policy using deep-Q-network (DQN).","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43929612","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

Review on Creep Phenomenon and Its Model in Aircraft Engines 航空发动机蠕变现象及其模型研究进展

4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-05-29 DOI: 10.1155/2023/4465565

Lin Yuan, Wang Chenglong, Sun Yongchao, Sun Mingbo, Yuan Yu, Gao Zhan, Xiao Yiwen

{"title":"Review on Creep Phenomenon and Its Model in Aircraft Engines","authors":"Lin Yuan, Wang Chenglong, Sun Yongchao, Sun Mingbo, Yuan Yu, Gao Zhan, Xiao Yiwen","doi":"10.1155/2023/4465565","DOIUrl":"https://doi.org/10.1155/2023/4465565","url":null,"abstract":"The aircraft is subjected to high-temperature and high-pressure conditions during flight, which renders it susceptible to the occurrence of creep phenomenon. Several academics have conducted extensive research on this issue. This research paper provides a comprehensive overview of the existing literature on creep phenomena in aircraft engines. First, several classical creep calculation models are enumerated and categorized as creep life calculation, creep-fatigue life calculation, and creep deformation calculation. Studies on creep phenomena are conducted in various components of aircraft engines, such as the engine’s turbine blades, turbine disks, and combustion chambers. The creep behavior of turbine blades in aircraft engines has been extensively researched. Furthermore, the protective measures aimed at mitigating creep are presented. Materials with high creep resistance can be used, and alternative fuels could be implemented. This paper provides an in-depth analysis of the advantages of creep in aircraft, presented in a favorable perspective. Finally, the prospective future research direction is discussed.","PeriodicalId":13748,"journal":{"name":"International Journal of Aerospace Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135831772","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 Weight-Generating Approach of a Deep Neural Network for the Parameter Identification of Dynamic Systems 基于深度神经网络的动态系统参数辨识权值生成方法

4区工程技术

International Journal of Aerospace Engineering Pub Date : 2023-05-29 DOI: 10.1155/2023/6610971

Weimeng Chu, Shunan Wu, Fangzhou Fu, Zhe Ye, Zhigang Wu

引用次数: 0