Acta Astronautica最新文献_第7页

Spray characteristics of pintle injector with high gas-liquid momentum ratio

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-10 DOI: 10.1016/j.actaastro.2025.02.012

Jiaqi Li , Nanjia Yu , Shutao Han , Chuang Zhou , Bowei Jiao

{"title":"Spray characteristics of pintle injector with high gas-liquid momentum ratio","authors":"Jiaqi Li , Nanjia Yu , Shutao Han , Chuang Zhou , Bowei Jiao","doi":"10.1016/j.actaastro.2025.02.012","DOIUrl":"10.1016/j.actaastro.2025.02.012","url":null,"abstract":"<div><div>Experimental and numerical simulation methods were employed to investigate the spray characteristics of a pintle injector under high gas-liquid momentum ratio conditions. In the experiments, water and nitrogen were used as the working media. The spray angle and spray modes were investigated using background light imaging and dynamic mode decomposition techniques. Numerical simulations were carried out using a three-dimensional Volume of Fluid to Discrete Particle Model (VOF to DPM) to explore the spray field configuration, Sauter Mean Diameter (SMD) of droplets, and droplet distribution. The results indicate that the spray pattern of the high momentum ratio gas-liquid pintle injector is distinct from that of the traditional hollow cone, presenting as a solid cylindrical spray with reduced size and lower turbulence levels in the recirculation zone. An empirical formula was derived for the spray angle, expressed as <span><math><mrow><mi>θ</mi><mo>=</mo><mn>32</mn><msup><mrow><mo>(</mo><mfrac><mi>M</mi><msqrt><mtext>We</mtext></msqrt></mfrac><mo>)</mo></mrow><mrow><mo>−</mo><mn>0.63</mn></mrow></msup></mrow></math></span>, incorporating the Weber number as a significant factor influencing the spray angle. Furthermore, the spray modes were classified into three types based on the gas-liquid momentum ratio (M) and Weber number (We), and their oscillation patterns were analyzed individually. The <em>M</em> was found to significantly influence the droplet diameter and distribution: a higher ratio resulted in a smaller droplet size but also led to droplet accumulation below the injector's central axis, potentially compromising the thermal protection of the pintle tip.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"230 ","pages":"Pages 119-130"},"PeriodicalIF":3.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and optimization of self-sensing voice coil actuator for spacecraft micro-vibration isolation

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-08 DOI: 10.1016/j.actaastro.2025.02.011

Qian Zhang , Bingtao Li , Guoying Zhao , Huihui Miao , Chenxi Wang , Naijin Liu , Jinxin Liu

{"title":"Design and optimization of self-sensing voice coil actuator for spacecraft micro-vibration isolation","authors":"Qian Zhang , Bingtao Li , Guoying Zhao , Huihui Miao , Chenxi Wang , Naijin Liu , Jinxin Liu","doi":"10.1016/j.actaastro.2025.02.011","DOIUrl":"10.1016/j.actaastro.2025.02.011","url":null,"abstract":"<div><div>With the development of spacecraft towards flexibility and complexity, vibration isolators with compact structure, low natural frequency, and high output force have become more and more significant. In this paper, a self-sensing voice coil actuator (SSVCA) with a high output force constant and low natural frequency is proposed for the micro-vibration isolation of the reaction wheel. The overall structure of the SSVCA with low axial stiffness and self-sensing capability is presented first. Then, a magnetic circuit modeling method based on an equivalent current model (MCM-ECM) is proposed, which can be easily embedded into an optimization algorithm for magnetic circuit optimization. The numerical simulation indicates that the proposed method can improve the output force constant of the SSVCA by 14.79 %, compared with the FEM based on the parametric analysis. Finally, experimental verification of the SSVCA is conducted, and the results indicate that (1) the output force constant error between the experiment and the proposed MCM-ECM is 0.78 % (experimental value is 9.13 N/A and MCM-ECM value is 9.05 N/A); (2) the acceleration collected by the self-sensing coil is consistent with the standard accelerometer under different frequencies, with a mean error of 0.0125 g, and the mean square error (MSE) is 0.0064 g; (3) the natural frequency of the SSVCA with 6.2 kg payload mass obtained by sine sweep frequency experiment is 5.335 Hz. The SSVCA used for passive isolation can achieve vibration attenuation of over −30 dB, while active isolation can achieve vibration attenuation of over −50 dB in the frequency range of 3.67–150 Hz, verifying its good low-frequency vibration isolation performance.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"229 ","pages":"Pages 901-917"},"PeriodicalIF":3.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the feasibility of spherical magnetic liquid mirror telescopes

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-08 DOI: 10.1016/j.actaastro.2025.01.066

Eric A. Comstock, Hugh Chen, Tianyang Hu, Álvaro Romero-Calvo

{"title":"On the feasibility of spherical magnetic liquid mirror telescopes","authors":"Eric A. Comstock, Hugh Chen, Tianyang Hu, Álvaro Romero-Calvo","doi":"10.1016/j.actaastro.2025.01.066","DOIUrl":"10.1016/j.actaastro.2025.01.066","url":null,"abstract":"<div><div>Liquid mirror telescopes exploit the rotation of a reflective fluid to generate diffraction-limited parabolic surfaces. They are economical and scalable but limited to zenith pointing. To expand their field of view, liquid mirror surfaces may be actuated into a spherical cap by means of magnetically susceptible liquids and electromagnetic coils, allowing the optics to rotate without actuating the mirror. However, the practical implementation of the concept remains largely unexplored. This paper adopts a nonlinear ferrohydrodynamic model to explore the technical feasibility of spherical liquid mirror telescopes. Surface deviations for a limited number of coils are extrapolated to determine the magnetic configuration requirements for a given optical wavelength, leading to an expected necessary coil count of <span><math><mrow><mn>16</mn><mo>±</mo><mn>12</mn></mrow></math></span> for a mirror capable of operation in the visible spectrum, and <span><math><mrow><mn>13</mn><mo>±</mo><mn>10</mn></mrow></math></span> for one operating in the mid-infrared. Tolerances of <span><math><mrow><mn>7</mn><mo>.</mo><mn>3</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> for coil positioning, 6.0 A for coil currents, and 9.1 nrad s<sup>−1</sup> for mirror spinning speed are required with coil currents of up to 20 MA to achieve the optical performance metrics using low-density ferrofluids. The results indicate that, although mathematically achievable, the required precision exceeds current technological capabilities, motivating alternative approaches to the problem.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"230 ","pages":"Pages 30-38"},"PeriodicalIF":3.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Autonomous station keeping of satellites in areostationary Mars orbit: A predictive control approach

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-08 DOI: 10.1016/j.actaastro.2025.01.064

Robert D. Halverson , Avishai Weiss , Gabriel Lundin , Ryan J. Caverly

{"title":"Autonomous station keeping of satellites in areostationary Mars orbit: A predictive control approach","authors":"Robert D. Halverson , Avishai Weiss , Gabriel Lundin , Ryan J. Caverly","doi":"10.1016/j.actaastro.2025.01.064","DOIUrl":"10.1016/j.actaastro.2025.01.064","url":null,"abstract":"<div><div>The continued exploration of Mars will require a greater number of in-space assets to aid interplanetary communications. Future missions to the surface of Mars may be augmented with stationary satellites that remain overhead at all times as a means of sending data back to Earth from fixed antennae on the surface. These areostationary satellites will experience several important disturbances that push and pull the spacecraft off of its desired orbit. Thus, a station-keeping control strategy must be put into place to ensure the satellite remains overhead while minimizing the fuel required to elongate mission lifetime. This paper develops a model predictive control policy for areostationary station keeping that exploits knowledge of non-Keplerian perturbations in order to minimize the required annual station-keeping <span><math><mrow><mi>Δ</mi><mi>v</mi></mrow></math></span>. The station-keeping policy is applied to a satellite placed at various longitudes, and simulations are performed for an example mission at a longitude of a potential future crewed landing site. Through careful tuning of the controller constraints, and proper placement of the satellite at stable longitudes, the annual station-keeping <span><math><mrow><mi>Δ</mi><mi>v</mi></mrow></math></span> can be reduced relative to a naïve mission design.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"230 ","pages":"Pages 1-15"},"PeriodicalIF":3.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Balancing commercialization and sustainability in outer space: Addressing new challenges

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-07 DOI: 10.1016/j.actaastro.2025.02.010

Anish Dey, Jithin Jagadanandan

{"title":"Balancing commercialization and sustainability in outer space: Addressing new challenges","authors":"Anish Dey, Jithin Jagadanandan","doi":"10.1016/j.actaastro.2025.02.010","DOIUrl":"10.1016/j.actaastro.2025.02.010","url":null,"abstract":"<div><div>One notable aspect of NewSpace is the growing influence of private non-state actors. Nation-states have also implemented policies that facilitate the involvement of private non-state players in space activities. The lack of progress in international space law since the Moon Agreement of 1979 highlights the need to reconsider and update the existing legal system. Therefore, it is necessary to create a different framework based on the concept of commercial reality. The article emphasises the impact of NewSpace on the technological and commercial aspects of the outer space industry. An analysis is conducted on the crucial requirement for regulatory reform in the field of outer space law and policy, which arises from these advancements in the future. The persistent obstacle in addressing the commercial development of NewSpace is the lack of clarity surrounding property rights in outer space, particularly concerning the ownership and utilisation of space resources. This article examines the issue presented by the national space laws, which have conflicting and inconsistent views on property rights in outer space. The article also aims to investigate the practicality of establishing an international framework for space cooperation. The importance of the New Age institutional mechanism for international collaboration and the agenda for the proposed mechanism are emphasized. The proposed institutional framework aims to achieve a balance between commercialization and profit-driven market pressures, considering their potential negative effects on the sustainable usage of outer space. In conclusion, the article discusses India's appropriate course of action in response to the emerging problems in the field of space exploration.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"229 ","pages":"Pages 895-900"},"PeriodicalIF":3.1,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Joint observation and transmission scheduling of multiple agile satellites with energy constraint using improved ACO algorithm 使用改进的 ACO 算法对具有能量约束的多颗敏捷卫星进行联合观测和传输调度

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-06 DOI: 10.1016/j.actaastro.2025.02.008

Minghao Shang , Ronggang Yuan , Bin Song , Xuxing Huang , Bin Yang , Shuang Li

引用次数: 0

Thermal stability of hafnia-containing ceramics for high temperature coatings

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-06 DOI: 10.1016/j.actaastro.2025.02.007

Valentina L. Stolyarova , Viktor A. Vorozhtcov

{"title":"Thermal stability of hafnia-containing ceramics for high temperature coatings","authors":"Valentina L. Stolyarova , Viktor A. Vorozhtcov","doi":"10.1016/j.actaastro.2025.02.007","DOIUrl":"10.1016/j.actaastro.2025.02.007","url":null,"abstract":"<div><div>Ceramics containing oxides of hafnium, zirconium, and rare earth metals can be considered as a base for development of thermal protection systems, which are in urgent demand for use at high temperature operation of aircraft and space vehicles. However, limited information on evaporation processes greatly limits the prospects of their applications as the operation temperatures are increasing. In this investigation, the information about the processes of evaporation and thermodynamic data determined by Knudsen effusion mass spectrometry in binary, ternary, and quaternary compositions based on oxides of hafnium, zirconium, and rare earth metals, which can be regarded as really important for such consideration, is discussed. A systematic comparison of rates of evaporation of samples in Sm<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-HfO<sub>2</sub>, La<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-HfO<sub>2</sub>, La<sub>2</sub>O<sub>3</sub>-Sm<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub>-HfO<sub>2</sub>, La<sub>2</sub>O<sub>3</sub>-Sm<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-HfO<sub>2</sub>, Gd<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub>-HfO<sub>2</sub>, and Gd<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-HfO<sub>2</sub> systems at 2373 K is presented. The main factors influencing the evaporation rates of the hafnia- and zirconia-based ceramics are determined, including the chemical nature of the oxides, their content, temperature, and existence of the condensed phase compounds. The data of this investigation are of exceptional significance in preparation of the refractory systems, for example using physical vapor deposition, as well as the development of protective coating with unique physicochemical properties, which are valuable for application at high temperatures up to 3000 K.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"229 ","pages":"Pages 866-873"},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interpersonal dynamics in spaceflight: An archival study

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-04 DOI: 10.1016/j.actaastro.2025.01.065

Tripp Driskell , C. Shawn Burke , James E. Driskell

引用次数: 0

3D printing of flexible parts out of lunar regolith simulant

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-04 DOI: 10.1016/j.actaastro.2025.02.003

Miranda Fateri , Achim Frick , Constantin Schuler , Tim Schubert , Jochen Hoffmann , Jacobus van der Walt , Michael Salinas

{"title":"3D printing of flexible parts out of lunar regolith simulant","authors":"Miranda Fateri , Achim Frick , Constantin Schuler , Tim Schubert , Jochen Hoffmann , Jacobus van der Walt , Michael Salinas","doi":"10.1016/j.actaastro.2025.02.003","DOIUrl":"10.1016/j.actaastro.2025.02.003","url":null,"abstract":"<div><div>On-site manufacturing using lunar regolith holds significant importance for lunar explorations. Concerning the lunar on-site manufacturing, the layer-wise material extrusion approach enables an automated method for fabricating components from lunar regolith blends. In this study, several samples of Thermoplastic Elastomer (TPU) mixed with lunar regolith simulant (10 %, 20 %, and 30 % by weight) were 3D printed using ARBURG Plastic Freeforming (APF) technology within a feasibility study. The mixture ratio and homogeneity of the lunar regolith simulant distribution within the 3D printed samples was assessed using Thermogravimetric Analysis (TGA) and X-Ray Microscopy (XRM). Mechanical properties of the 3D printed TPU samples as well as the mixed TPU with different mixture ratios of lunar regolith simulant were examined using a universal tensile testing machine. Moreover, the internal structures of the 3D printed samples were analysed using XRM. Finally, several functional samples, such as flexible tubes for lunar applications, were 3D printed to demonstrate the capabilities of the APF process.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"229 ","pages":"Pages 779-786"},"PeriodicalIF":3.1,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143368334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D printing of regolith-based epoxy composites with excellent temperature resistance and mechanical strength

IF 3.1 2区物理与天体物理

Acta Astronautica Pub Date : 2025-02-03 DOI: 10.1016/j.actaastro.2025.02.001

Chengwei Bao , Yanen Wang , Garth Pearce , Pan Zhao , Minyan Liu , Ray Tahir Mushtaq

{"title":"3D printing of regolith-based epoxy composites with excellent temperature resistance and mechanical strength","authors":"Chengwei Bao , Yanen Wang , Garth Pearce , Pan Zhao , Minyan Liu , Ray Tahir Mushtaq","doi":"10.1016/j.actaastro.2025.02.001","DOIUrl":"10.1016/j.actaastro.2025.02.001","url":null,"abstract":"<div><div>Preparing regolith-based composites for 3D printing is crucial in lunar base construction, leveraging cost-effective and mechanically favorable materials for lunar construction by utilizing lunar regolith as the reinforcing phase. This research focuses on developing lunar regolith simulant as a matrix for 3D printing, which is crucial for in-situ resource utilization on the Moon. Resin-based composites, well-established in aerospace, are explored for their simple manufacturing and robust properties. The formulation involves simulated regolith-based polymer for direct ink writing printing. Rheological properties, including yield stress and plastic viscosity, are characterized across various cementite-sand ratios and printing temperatures. The relationship between extrudability, the time interval of the printing material and its rheological attributes is investigated. Quantitative assessment of material buildability employs three-dimensional scanning of the printed parts. Freeze-thaw cycle tests explore its temperature resilience. The influence of varying the printing infill rate on printing efficiency and the performance of the printed parts was assessed. It was found that modulating the printing infill rate affects the efficiency and performance of parts, with a 1:4 cementite-sand ratio and a 40 <span><math><mrow><mo>°C</mo></mrow></math></span> print temperature demonstrating optimal printing workability. These findings offer an efficient scheme for the automated production of regolith-based epoxy composites with precise structural, temperature-resistant, and favorable mechanical properties.</div></div>","PeriodicalId":44971,"journal":{"name":"Acta Astronautica","volume":"229 ","pages":"Pages 787-803"},"PeriodicalIF":3.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143368333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0