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Numerical Simulation and Contour Design of Aerospike Nozzle: a Behavioural Study on Truncation Effects of Nozzle 气钉喷嘴的数值模拟与外形设计——喷嘴截断效应的行为研究
Pub Date : 2020-08-31 DOI: 10.15866/irease.v13i4.17343
K. C. Udaiyakumar, K. Iyer, V. Akhil, Anshul Motwani, Vibhor Rajesh Bhaise
The objective of this paper is to present a design and an analysis procedure for a highly efficient aerospike nozzle that uses Liquid Oxygen and Liquid Hydrogen (LOX/LH2) as fuel for a Single Stage to Orbit (SSTO) spacecraft. This paper provides a simple method to design an aerospike nozzle contour in addition to the results of the Computational Fluid Dynamics (CFD) analysis carried out for this nozzle with and without truncation. The results have been compared with the theoretical values, and the changes in specific thrust with different level of truncation have been shown. The geometry of the nozzle has been created using the method of characteristics and python codes, and flow analysis have been carried out using ANSYS FLUENT for the optimum working condition of the nozzle. The nozzles have been able to achieve excellent altitude compensation, and the nozzle with 40% truncation has come out to be the most efficient.
摘要介绍了一种以液氧和液态氢(LOX/LH2)为燃料,用于单级入轨(SSTO)航天器的高效气动喷管的设计和分析过程。本文提供了一种简单的设计方法,并对该喷嘴进行了计算流体力学(CFD)分析,结果表明该喷嘴有截断和无截断。将计算结果与理论值进行了比较,得到了不同截尾水平下比推力的变化规律。利用特征法和python代码建立了喷嘴的几何形状,并利用ANSYS FLUENT对喷嘴的最佳工作状态进行了流动分析。结果表明,采用截断量为40%的高度补偿喷嘴的高度补偿效率最高。
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引用次数: 0
System Identification of a 6 m2 Kite Power System in Fixed-Tether Length Operation 固定系绳长度运行中6 m2风筝动力系统的系统识别
Pub Date : 2020-08-31 DOI: 10.15866/irease.v13i4.18897
Mostafa A. Rushdi, Tarek N. Dief, A. M. Halawa, S. Yoshida
The traction force of a kite system can be utilized for extracting energy from high-altitude wind. This paper discusses a system identification algorithm derived to obtain real-time governing equations for the kite system based on real-flight data, obtained from a 6 m2 kite power system developed in Kyushu University as an airborne wind energy project. The paper presents the system set-up, the design, the experimental results, a system identification algorithm, and the parameters identified for the kite used. The current stage of the project considers the kite application as a fixed-tether length system with a ground kite control unit. The control strategy is designed to work as a hardware-in the-loop to keep receiving the data and controlling the kite in real time. The experimental tests employed are divided into four distinct ones, and the data of the kite’s attitude, position, and tension forces are recorded. The tension forces resulted from these tests are presented for different wind speeds and flight modes. Ultimately, a novel system identification algorithm that evaluates the correlation between the tension force and the kite’s rolling angle over the four tests is applied, thereby enabling to study the kite behavior as a preliminary step for the achievement of autonomous flight.
风筝系统的牵引力可以用来从高空风中提取能量。本文讨论了基于九州大学机载风能项目中6 m2风筝动力系统的实际飞行数据,推导出的系统识别算法,以获得风筝系统的实时控制方程。本文介绍了该系统的组成、设计、实验结果、系统辨识算法以及所用风筝的参数辨识。项目的当前阶段将风筝应用视为具有地面风筝控制单元的固定系绳长度系统。控制策略被设计为硬件在环,以保持接收数据和实时控制风筝。所采用的实验测试分为四个不同的测试,并记录了风筝的姿态、位置和张力的数据。在不同的风速和飞行模式下,给出了这些试验所得到的张力。最后,应用了一种新的系统识别算法来评估四种测试中张力与风筝滚动角度之间的相关性,从而能够研究风筝的行为,作为实现自主飞行的初步步骤。
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引用次数: 2
Aeroelastic Analysis for Side-Booms of a Coplanar Twin-Rotor Wind Turbine 共面双转子风力机侧臂气动弹性分析
Pub Date : 2020-08-31 DOI: 10.15866/irease.v13i4.18355
A. Ismaiel, S. Yoshida
As an extension to a previous research made by the authors, this paper represents an aeroelastic analysis for the side-booms supporting the two rotors of a coplanar twin-rotor wind turbine. For a better understanding of the turbine dynamic behavior, the inhouse aeroelastic tool developed by the authors, which is considered as the first approach to study the aeroelasticity of multi-rotor wind turbines, has been extended to model the side-booms and compare three different configurations of the boom size during the analysis. The model is based on deterministic models, where aerodynamic loads are calculated using blade element momentum theory, and virtual work method with a modal approach is used for structure analysis. The three configurations of the side-booms have three different diameters while all other geometrical parameters are kept constant. The bigger the boom diameter, the higher the bending stiffness becomes. It was found that the weight of the rotor is dominant over the fluctuating aerodynamic loads in the in-plane direction, while the deflection is highly affected by the turbulence in the out-of-plane direction. It was also found that the relation between the stiffness and the mean side-boom deflection is of second order, hence, a thorough compromise between weight and strength should be done when designing the side-booms.
作为作者前人研究的延伸,本文对共面双转子风力机支撑双转子的侧臂进行了气动弹性分析。为了更好地理解涡轮机的动力特性,作者开发的内部气动弹性工具被认为是研究多转子风力发电机气动弹性的第一个方法,已经扩展到对侧臂进行建模,并在分析过程中比较了三种不同配置的臂架尺寸。该模型基于确定性模型,采用叶片单元动量理论计算气动载荷,采用模态方法进行结构分析。侧臂的三种结构有三种不同的直径,而所有其他几何参数保持不变。臂架直径越大,弯曲刚度越大。结果表明,在面内方向上,旋翼的重量对波动气动载荷起主导作用,而在面外方向上,旋翼的偏转受湍流的影响较大。刚度与侧臂平均挠度之间的关系是二阶的,因此在设计侧臂时应充分考虑重量与强度之间的关系。
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引用次数: 2
Launch Environment Ground Test Evaluation with Multi-axis Vibration and Shock for Pouch Solid-State-Ceramic Battery Advanced Energy Storage 先进储能袋式固态陶瓷电池多轴振动与冲击发射环境地面试验评价
Pub Date : 2020-08-31 DOI: 10.15866/irease.v13i4.18949
Lakhdar Limam, K. Hatanaka, J. Gonzalez-Llorente, Masayuki Miyazaki, Takeya Chikashi, Kei-Ichi Okuyama
Satellites must endure the hostile environement during their launching to space via rocket; therefore, they should be exposed to the real launch conditions for ground testing, including all subsystems and components which should be carefully tested. Several solid-state-ceramic batteries have been selected to be evaluated under the launch environment after been evaluated under the space environment, which has shown so far good results. This paper focuses on the physical degradation and the electrical performances of the batteries based on the discharge capacity, the open-circuit voltage, and charge/discharge modes. Batteries have been exposed to shock, then tested under vibration within different frequencies’ levels with sinewave, sine burst, and random. Before and after the test, the physical properties of all batteries have been checked, several cycles of discharge and charge have been performed to check their performances and survivability after the evaluation test. With 95% of capacity, batteries could demonstrate their ability to withstand the launch conditions successfully, they could be able to operate during several cycles after the test, so far, showing no degradation on their performances within the limits. Also, the paper is providing the main requirements and criteria for batteries’ launch ground testing for the small satellite project.
卫星在通过火箭发射到太空的过程中必须忍受恶劣的环境;因此,它们应该暴露在真实的发射条件下进行地面测试,包括所有子系统和组件都应该仔细测试。在空间环境下进行评价后,又选择了几种固态陶瓷电池在发射环境下进行评价,目前取得了较好的效果。本文从电池的放电容量、开路电压和充放电方式三个方面对电池的物理退化和电性能进行了研究。电池受到冲击,然后在不同频率的正弦波、正弦波和随机振动水平下进行测试。在测试前后,对所有电池的物理性能进行了检查,并在评估测试后进行了多次循环放电和充电,以检查其性能和生存能力。在95%的容量下,电池可以成功地证明它们能够承受发射条件,它们可以在测试后的几个循环中运行,到目前为止,在限制范围内它们的性能没有下降。同时,提出了小卫星工程中电池地面试验的主要要求和标准。
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引用次数: 2
Autonomous Water Sampling Payload Design 自主水采样有效载荷设计
Pub Date : 2020-06-30 DOI: 10.15866/irease.v13i3.18374
S. A. Salman, Muzoun Al Dhaheri, Peter J. Dawson, S. Anavatti
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引用次数: 0
A Thermo-Fluid Model of Droplet Evaporation and Pressure Variation in Venturi Liquid-Gas Mixers 文丘里液气混合器液滴蒸发和压力变化的热流体模型
Pub Date : 2020-06-30 DOI: 10.15866/irease.v13i3.18758
Adwaith Ravichandran, J. Storey, D. Kirk
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引用次数: 1
In Orbit Operations of an Educational Cubesat: the e-st@r-II Experience 教育立方体卫星在轨运行:e-st@r-II经验
Pub Date : 2020-04-30 DOI: 10.15866/irease.v13i2.18317
F. Stesina, S. Corpino
CubeSats have achieved a place of relevance in the modern space missions. However, CubeSats need improvements in terms of new technologies, mission and system reliability, and management of the entire product life cycle. A major lack of knowledge exists about the operations of past and current CubeSats in orbit. Operations planning and re-planning, failures and anomalies management, step-by-step procedures and rules of execution are crucial but poorly analyzed aspects that can increase the success rate of a mission. Moreover, information about the programmatic and technical achievements and lessons learned during the operation phases is often not available or incomplete. However, the sharing of the results, especially for educational programs, becomes fundamental to improve the quality of missions and to prevent mistakes. This paper aims at reducing this gap of knowledge and at sharing the experience and the lessons learned gained by the CubeSat Team of Politecnico di Torino over the three years of in-orbit operations of the E-ST@R-II mission. The flexible approach adopted for the operations planning, the management of anomalies and the re-planning of the operations are presented. Simple yet effective tools have been developed for mission planning and root causes identification, and they are presented through the discussion of the main technical and educational results. The paper provides also a list of good practices and recommendations applicable to future CubeSat missions.
立方体卫星在现代空间任务中占有重要地位。然而,立方体卫星在新技术、任务和系统可靠性以及整个产品生命周期管理方面需要改进。人们对过去和现在在轨立方体卫星的运行情况缺乏了解。行动规划和重新规划、故障和异常管理、分步程序和执行规则是至关重要的,但分析不善的方面可以提高任务的成功率。此外,关于在行动阶段取得的方案和技术成就以及吸取的教训的资料往往得不到或不完整。然而,分享成果,特别是教育项目的成果,对于提高任务质量和防止错误至关重要。本文的目的是缩小这一知识差距,并分享都灵理工大学立方体卫星小组在E-ST@R-II任务的三年在轨运行中所获得的经验和教训。提出了在作业计划、异常管理和作业再规划等方面采用灵活的方法。已经为任务规划和查明根本原因开发了简单而有效的工具,并通过对主要技术和教育成果的讨论提出了这些工具。该文件还列出了适用于未来立方体卫星任务的良好做法和建议。
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引用次数: 0
Space Environment Evaluation Test of Solid-State-Ceramic Battery Advanced Energy Storage Under Vacuum and Thermal Vacuum 真空和热真空下固态陶瓷电池先进储能空间环境评价试验
Pub Date : 2020-04-30 DOI: 10.15866/irease.v13i2.18582
Lakhdar Limam, K. Hatanaka, J. Gonzalez-Llorente, Maeda Chihiro, Takeya Chikashi, Kei-Ichi Okuyama
The desired capabilities of small satellites to enable their applications in communication, earth observation, and new scientific instruments require advanced energy storage to face the design’s challenges with the constraints of volume and mass. Small batteries with high energy density may be the solution. New lithium-ion battery technologies areimproved in order to meet these requirements by bringing higher energy density and a wide temperature range than the commercially available ones as well as a lower risk of explosion. In this paper, the ability of solid-state-ceramic batteries to withstand the vacuum and thermal vacuum for low earth orbit applications has been demonstrated, with a minimum safety issue. So far, this technology has never been flown in space. This paper also provides a guideline for the battery evaluation test where the main lines are represented. Batteries are tested under vacuum and thermal vacuum, where they are discharged and charged during several cycles between two temperatures limits. The evaluation focuses on analyzing the physical degradation, the discharge capacity, and the internal resistance before and after each test. Batteries have showed promising results regarding their survivability to thermal vacuum. After several cycles, they have kept almost the same performances, with the same internal resistance and 98% of capacity.
小型卫星在通信、地球观测和新型科学仪器方面的应用需要先进的能量存储,以应对体积和质量限制下的设计挑战。具有高能量密度的小型电池可能是解决方案。为了满足这些要求,新的锂离子电池技术得到了改进,比市售电池具有更高的能量密度和更宽的温度范围,而且爆炸风险更低。在本文中,固态陶瓷电池在低地球轨道应用中承受真空和热真空的能力已经得到证明,并且存在最小的安全问题。到目前为止,这项技术还没有在太空中飞行过。本文还提供了一个指导方针,电池的评估试验,其中主要线路表示。电池在真空和热真空下进行测试,在两个温度极限之间的几个循环中进行放电和充电。评估的重点是分析每次测试前后的物理退化、放电容量和内阻。电池在热真空环境下的生存能力显示出了令人鼓舞的结果。经过几次循环,它们几乎保持相同的性能,具有相同的内阻和98%的容量。
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引用次数: 3
Fault-Tolerant Electric Motors with Permanent Magnets and Electromagnetic Shunting 永磁体和电磁分流容错电动机
Pub Date : 2020-04-30 DOI: 10.15866/irease.v13i2.17751
F. Ismagilov, V. Vavilov, I. Yamalov, R. Karimov
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引用次数: 1
Study of the Mechanics of the Spacesuit Gloves 太空服手套的力学研究
Pub Date : 2020-04-30 DOI: 10.15866/irease.v13i2.18077
E. O. Bykova, G. R. Kamaletdinova, A. Sorokin
Human safety and ergonomics are the key aspects for engineers working on the design of flight suits. The most important is the prevention of skin damage, the protection of the entire human body, especially from an aggressive environment, and the provision of comfort comparable to everyday clothes. The study is conducted by the Moscow Aviation Institute (National Research University) and is aimed to identify the main problems of modern design of flight suits, which can then be compared and applied to spacesuits. Different spacesuits have been analyzed to prove an importance of high flexibility of the spacesuit’s elements. Pre- and postflight tests stressed high risk of human body injuries in more flexible places comparing to solid ones. At the same time, the bending elements of the suit play crucial role in the operational performance. Based on these overviews a specific glove for spacesuits has been selected and analyzed in details, as an example of the most flexible and important part of the flight kit. This study is aimed to find the most effective way to allow flexibility of the elements of the glove and, as a result, to improve safety and ergonomic markers of the whole spacesuit. For this reason, a mathematical model of human performance (in different operations as bending, holding etc.) has been created and a comparative analysis of joints has been made based on quantitative data on the number of elements, including adhesion, tightening, etc. The experiments have been carried out using tests with a probability level of 0.05. As a result, this article discusses methodological recommendations and safety requirements as well as ways to improve modern gloves. It can potentially affect the direction of its further development identifying a general approach to the flight suit design. This paper also gives an overview of potential spin-off of selected technology.
对于从事飞行服设计的工程师来说,人体安全和人体工程学是关键的方面。最重要的是防止皮肤损伤,保护整个人体,特别是免受恶劣环境的侵害,并提供与日常衣服相当的舒适度。这项研究是由莫斯科航空研究所(国立研究大学)进行的,旨在确定现代飞行服设计的主要问题,然后可以比较并应用于航天服。对不同的宇航服进行了分析,证明了宇航服元件的高灵活性的重要性。飞行前和飞行后的测试强调,与固体相比,在更灵活的地方,人体受伤的风险更高。同时,宇航服的弯曲元件对其使用性能起着至关重要的作用。在这些概述的基础上,我们选择了一种特殊的宇航服手套,并对其进行了详细的分析,作为飞行装备中最灵活、最重要的部分。这项研究的目的是找到最有效的方法,使手套的元素具有灵活性,从而提高整个航天服的安全性和人体工程学标志。因此,建立了人体行为的数学模型(在不同的操作中,如弯曲、握住等),并根据粘合、拧紧等要素数量的定量数据对关节进行了比较分析。本实验采用概率水平为0.05的检验进行。因此,本文讨论了方法建议和安全要求以及改进现代手套的方法。它可以潜在地影响其进一步发展的方向,确定飞行服设计的通用方法。本文还概述了所选技术的潜在衍生产品。
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引用次数: 0
期刊
International Review of Aerospace Engineering
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