Microgravity Science and Technology最新文献_第5页

Gravity Unloading Control for an Adjustable-Lever-Arm Constant Spring Support Mechanism 一种可调杠杆臂恒弹簧支撑机构的重力卸载控制

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-05-16 DOI: 10.1007/s12217-026-10257-0

Yong-Li Zhang, Wen-Bao Mu, Xiao-Qiang Tang, Ji-Xiang Xu, Guo-Liang Zhao

{"title":"Gravity Unloading Control for an Adjustable-Lever-Arm Constant Spring Support Mechanism","authors":"Yong-Li Zhang, Wen-Bao Mu, Xiao-Qiang Tang, Ji-Xiang Xu, Guo-Liang Zhao","doi":"10.1007/s12217-026-10257-0","DOIUrl":"10.1007/s12217-026-10257-0","url":null,"abstract":"<div>The success of lunar landing missions critically depends on the faithful reproduction of the target celestial body’s mechanical environment through ground simulation tests, particularly during the critical touchdown phase of the lunar lander (LL). To accurately simulate lunar gravity conditions during the dynamic descent of the LL on Earth, this paper proposes an adjustable-lever-arm constant spring support (ALA-CSS). This mechanism achieves dynamic compensation for potential energy changes. A dynamic model of the ALA-CSS is established, and its nonlinear dynamic characteristics are analyzed in detail. An inverse-based feedforward-feedback (IBFF) control strategy, integrated with a force feedback controller, is developed to simulate the entire LL touchdown process. This approach thereby ensures that an 83.3% gravity unloading ratio is maintained throughout the entire sequence, from the free-fall phase to the touchdown damping phase. The LL maintained precise lunar gravity characteristics during a 2m free-fall, followed by touchdown damping at a height of 0.15 m. A smooth transition in the unloading control is achieved between these two phases. Digital experiments demonstrate that in Earth-based dynamic unloading scenarios, the proposed scheme offers high precision and fast response. The results are further validated by a multibody dynamics simulation using ADAMS, confirming the effectiveness of the proposed mechanism and control strategy.</div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938364","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

Numerical Study of Vane Geometry Parameters on Propellant Management Performance of Common Bulkhead Tanks Under Different Microgravity 不同微重力下叶片几何参数对普通舱壁罐推进剂管理性能影响的数值研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-05-11 DOI: 10.1007/s12217-026-10256-1

Tinglan Xiao, Qi Yang, Deyou Li, Xiaolong Fu, Jintao Liu

{"title":"Numerical Study of Vane Geometry Parameters on Propellant Management Performance of Common Bulkhead Tanks Under Different Microgravity","authors":"Tinglan Xiao, Qi Yang, Deyou Li, Xiaolong Fu, Jintao Liu","doi":"10.1007/s12217-026-10256-1","DOIUrl":"10.1007/s12217-026-10256-1","url":null,"abstract":"<div>With its core advantage of greatly improving the structural efficiency of propellant tanks, the common bulkhead structure has become a key development direction for high-performance satellite surface tension propellant tanks. However, previous studies on vane structural parameters have ignored the influence of microgravity acceleration magnitude on flow mechanism and parameter design, leading to a lack of targeted design criteria for surface tension tanks. This study employs numerical simulation methods and monitoring indicators, such as the leading-edge height and transferred volume of the propellant, to explore the effects of the vane thickness, gap distance, and propellant fill ratio on the gas–liquid management performance of common bulkhead tanks. This study reveals the transition of the dominant force balance of capillary-induced motion under microgravity: under 10− 3 g microgravity, the flow is co-dominated by surface tension, inertial force, viscous force and non-negligible acceleration force; under 10− 5 g microgravity, the flow is completely dominated by the balance between surface tension and viscous force. The results demonstrate that increasing the vane thickness significantly enhances management performance while the optimal gap distance is acceleration-dependent. This study offers guidance for designing new-generation common-bulkhead surface tension tanks.</div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938292","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

Correction: Role of Boundary Conditions and Volumetric Heating in Electrothermal Anisotropic Porous Convection 修正：边界条件和体积加热在电热各向异性多孔对流中的作用

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-05-09 DOI: 10.1007/s12217-026-10255-2

C. S. Rachitha, C. E. Nanjundappa, I. S. Shivakumara

引用次数: 0

Thermal Analysis of Vapour Bubble under the Impact of Peristaltic Motion Inside a Vertical Cylindrical Tube 垂直圆柱管内气泡在蠕动运动影响下的热分析

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-05-06 DOI: 10.1007/s12217-026-10254-3

Saliha Zafar, Ambreen Afsar Khan

引用次数: 0

Stability of the Cattaneo–Christov–Jordan–Mariano Model for Thermal Convection in a Porous Medium with Variable Gravity 变重力多孔介质热对流Cattaneo-Christov-Jordan-Mariano模型的稳定性

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-04-22 DOI: 10.1007/s12217-026-10252-5

Amit Mahajan, Sonali Dagar

{"title":"Stability of the Cattaneo–Christov–Jordan–Mariano Model for Thermal Convection in a Porous Medium with Variable Gravity","authors":"Amit Mahajan, Sonali Dagar","doi":"10.1007/s12217-026-10252-5","DOIUrl":"10.1007/s12217-026-10252-5","url":null,"abstract":"<div>\u0000 \u0000 This study examines thermally induced convective flow in a fluid-saturated porous medium, where momentum transport follows extended Darcy’s law and thermal transport is governed by the Cattaneo–Christov–Jordan–Mariano (CCJM) model, allowing for variations in the gravitational field. The CCJM framework generalizes the classical Fourier heat conduction model to include thermal diffusion, finite thermal relaxation, and inertial effects, while the momentum equation accounts for the presence of a spatially varying gravitational field. Collectively, these effects provide a more physically consistent depiction of heat transport and convective behavior in porous media. The onset of convection is examined through a combined linear analysis, encompassing stationary and oscillatory modes, together with a nonlinear stability framework. Linear stability is evaluated using the normal-mode technique, while the nonlinear stability equations are obtained through the energy method. Numerical simulations are performed using MATLAB to determine the critical stability parameters, and the corresponding plots depict the resulting stability characteristics. The Galerkin single-term approach is used to measure the critical Rayleigh number and the corresponding wavenumber. Four distinct gravity-variation profiles are examined, revealing that the gravity-modulation parameter (gamma ) may exert either a stabilizing or destabilizing influence depending on the specific profile considered. The numerical illustrations further highlight the roles of the parameters (zeta ), (Sg), and (Va) in shaping the overall stability behavior of the system. Collectively, these results highlight the joint influence of gravity modulation and material parameters on the initiation of convection, offering enhanced insight into the thermal stability of viscoelastic porous media within the Cattaneo–Christov–Jordan–Mariano (CCJM) framework.\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738522","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

Simulation of Multiphase Flows in Porous Media Under Microgravity Conditions 微重力条件下多孔介质中多相流动的模拟

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-04-17 DOI: 10.1007/s12217-026-10250-7

Nickolay Smirnov, Evgeniya Skryleva, Lusine Paremskaya, Mikhail Paremski, Anastasia Manakhova, Elena Mikhalchenko, Fang Wang

引用次数: 0

Hfq Positively Regulated the Proliferation Ability of Escherichia coli K-12 Under Simulated Microgravity Condition Hfq正调控模拟微重力条件下大肠杆菌K-12的增殖能力

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-04-06 DOI: 10.1007/s12217-026-10249-0

Xinxin Li, Ya Li, Huaxian Li, Quanxian Guo, Wentian Zhang, Manzhi Gao, Sumin Li, Hanxiao Zhang, Weiwei Yan, Yong Liu, Peijun Han, Wenlan Wang

{"title":"Hfq Positively Regulated the Proliferation Ability of Escherichia coli K-12 Under Simulated Microgravity Condition","authors":"Xinxin Li, Ya Li, Huaxian Li, Quanxian Guo, Wentian Zhang, Manzhi Gao, Sumin Li, Hanxiao Zhang, Weiwei Yan, Yong Liu, Peijun Han, Wenlan Wang","doi":"10.1007/s12217-026-10249-0","DOIUrl":"10.1007/s12217-026-10249-0","url":null,"abstract":"<div>\u0000 \u0000 Simulated microgravity enhances Escherichia coli (E. coli) proliferation ability, but the underlying mechanisms remain unclear. In this study, we cultured E. coli in a three-dimensional rotational environment for 14 days to establish simulated microgravity strains (SMG). Compared to normal gravity strains (NG), SMG exhibited enhanced growth rate, and motility. Hfq plays a crucial role in proliferation ability in terms of growth rate and motility in E. coli. And it is worth noting that, compared with the NG, the expression of hfq in E. coli was upregulated in SMG. The expression of genes including minD, minE, flhC and flhD upregulated in SMG. To investigate the effect of hfq on E. coli proliferation ability, we knocked out hfq in E. coli to establish a Δhfq E. coli strain and cultured it under simulated microgravity conditions for 14 days (Δhfq SMG). The Δhfq SMG exhibited reduced growth rate and motility compared to SMG. Meanwhile, the expression levels of minD, minE, flhC and flhD were downregulated. Replenishing hfq to Δhfq SMG could restore growth rate and motility, and re-activate the downregulated genes. In conclusion, it is demonstrated that hfq played a significant role in the proliferation ability of E. coli under simulated microgravity condition and this effect might be closely related to the proliferation ability -related genes of E. coli. This study may provide a new idea for preventing and controlling opportunistic pathogenic bacterial infections during aerospace missions.\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642736","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

Correction: A Comprehensive Review of Flashing Phenomena and Evaporation Wave Propagation in Superheated Liquids 修正：过热液体中闪蒸现象和蒸发波传播的综合综述

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-04-01 DOI: 10.1007/s12217-026-10251-6

Kush Kumar Dewangan, Ojas Satbhai, Satish Kumar Gavel, Kiran Kumar Rokhade

引用次数: 0

Numerical Research on the Sloshing Suppression Performance of Baffles in Partially Filled Liquid Storage Tanks 部分充液储罐挡板抑制晃动性能的数值研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-03-27 DOI: 10.1007/s12217-026-10248-1

Lie Wei, Xiao Zhao, Hai Lin, Kai Li, Yu Liu

{"title":"Numerical Research on the Sloshing Suppression Performance of Baffles in Partially Filled Liquid Storage Tanks","authors":"Lie Wei, Xiao Zhao, Hai Lin, Kai Li, Yu Liu","doi":"10.1007/s12217-026-10248-1","DOIUrl":"10.1007/s12217-026-10248-1","url":null,"abstract":"<div>\u0000 \u0000 Numerical simulations were conducted to examine the effects of various anti-sloshing structures on the hydrodynamic behavior of liquid sloshing in tanks. The analysis systematically evaluated free-surface evolution, centroid motion, and force responses over a range of filling ratios. The results indicate that the filling ratio is a dominant factor governing sloshing intensity, with increased liquid mass leading to higher peak forces and slower decay rates. Moreover, internal structures substantially alter liquid migration patterns, thereby modifying the dominant frequency, peak force magnitude, and damping characteristics. Among the configurations considered, the sidewall partition (Configuration 2) exhibited superior mitigation performance at low and high filling ratios, yielding the lowest force and frequency in conjunction with the highest damping ratio. Conversely, the double-side perforated structure (Configuration 4) promoted enhanced momentum exchange, resulting in the highest force and frequency, albeit accompanied by rapid initial attenuation. The single-side perforated configuration (Configuration 3) displayed pronounced nonlinear behavior, characterized by rapid early decay followed by a marked reduction in attenuation rate. Collectively, these findings offer valuable guidance for the design and optimization of effective slosh-mitigation systems.\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561436","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

Mechanism and Propagation Mode of Upward Flame Spread on Solid Material Surface Under Gravity Effects 重力作用下固体材料表面火焰向上传播的机理与传播模式

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2026-03-25 DOI: 10.1007/s12217-026-10247-2

Yuhan Jiang, Feng Zhu, Shuangfeng Wang

{"title":"Mechanism and Propagation Mode of Upward Flame Spread on Solid Material Surface Under Gravity Effects","authors":"Yuhan Jiang, Feng Zhu, Shuangfeng Wang","doi":"10.1007/s12217-026-10247-2","DOIUrl":"10.1007/s12217-026-10247-2","url":null,"abstract":"<div>\u0000 \u0000 The mechanism and steady propagation of upward flame is key aspects of the solid materials flammability. The controlling mechanisms of upward flame spread over solid fuels were studied through a numerical modeling. The objective of the present study is to gain insight into the intrinsic mechanisms of the steady spread process of a solid fuel, as well as to gain a more comprehensive understanding of the critical conditions for the steady spread process. For this purpose, a two-dimensional numerical model has been developed using the Fire Dynamic Simulator (FDS6) code, in which both solid-phase and gas-phase reactions are calculated. Flame spread process with a series of gravity levels were studied, and the buoyant flow effects were discussed. The simulation results show that with the decrease of the buoyant flow, three distinct flame spread modes are identified, namely the skipping mode and splitting mode due to advanced pyrolysis of downstream fuel, and steady spread mode for subcritical gravity. When the buoyancy is weak enough, the flame can spread upward with a steady rate, which is dominated by the constant air supply caused by the backflow zone aside the flame. Under these conditions, the flame spread rate increases linearly with the increased gravity. Reduced-pressure experiments were carried out to examine the flame spread modes under suppressed buoyancy conditions, which shows good agreements with numerical results.\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 2","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561683","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