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Impulsive Load Destructive Effects Reduction in Launch Vehicles Using Structural Joint 利用结构连接降低运载火箭的冲击载荷破坏效应
Pub Date : 2023-08-23 DOI: 10.30699/jsst.2023.1436
Hamed Kashani
Aerospace systems and subsystems are subjected to impulsive loads due to several reasons like engine start and burnout, separation and so on. These loads may make temporary or permanent failures in some sensitive components or subsystems. To avoid these failures some constraints should be consider in design mechanical process. Another approach can be reducing the load level in transmission path without any change in the source of load and without adding any new component and only with design optimization of available components i.e. , structural joints destructive effects of impulsive loads. This paper uses analytical results of joints behavior to present practical solution for minimizing load transmission through the joint.
航空航天系统和子系统会因发动机启动和熄火、分离等多种原因而受到冲击载荷的影响。这些负载可能会导致一些敏感元件或子系统出现暂时或永久性故障。为了避免这些故障,在机械设计过程中应考虑一些限制因素。另一种方法是在不改变载荷源、不增加任何新部件的情况下降低传输路径中的载荷水平,只对现有部件(即受冲击载荷影响的结构连接件)进行优化设计。本文利用对连接行为的分析结果,提出了将通过连接传递的载荷最小化的实用解决方案。
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引用次数: 0
Study of space weather and its risks on human biologic processes 研究空间气象及其对人类生物过程的风险
Pub Date : 2023-08-23 DOI: 10.30699/jsst.2023.1431
Aida Kazemi Hokmabad, Seyede Elahe Khatoon abadi Kalali, Amir Reza Kosari, Ehsan Kosari, Vahid Bohlouri
This paper investigates solar activities and its phenomena from the perspective of risks to the earth's environment, human health, and space weather risks to space systems. In this article, in addition to a brief explanation about the physics of the sun and space weather phenomena, the effects of these phenomena on human health have been investigated. Moreover, the results of international researches have been studied and analyzed to determine the relationship between heart diseases, brain diseases, cancer, birth rates, health of astronauts, and animal life with space weather phenomena. The results of this article help to predict these events during the occurrence of solar events and by taking the correct actions in addition to preserving biological health, possible damages can also be minimized.
本文从对地球环境、人类健康和空间系统的空间气象风险的角度研究太阳活动及其现象。本文除了简要介绍太阳物理学和空间天气现象外,还研究了这些现象对人类健康的影响。此外,还研究和分析了国际研究成果,以确定心脏病、脑部疾病、癌症、出生率、宇航员健康和动物生命与空间天气现象之间的关系。这篇文章的结果有助于在太阳活动发生时预测这些事件,除了保护生物健康外,还可以通过采取正确的行动将可能造成的损害降至最低。
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引用次数: 0
Growth Mechanism of Matricaria chamomilla Plant Under Space Lighting System: Induction of Pigment Synthesis, Enzyme Defense System, and Antioxidant Metabolites 空间照明系统下洋甘菊的生长机制:色素合成、酶防御系统和抗氧化代谢物的诱导
Pub Date : 2023-08-23 DOI: 10.30699/jsst.2023.1412
H. Hassanpour
Light is a vital factor for plant cultivation in space. In this research, the impact of light spectrums was studied on the growth mechanisms through chlorophyll pigments, enzyme defense system, and antioxidant metabolite analyses. Seeds were cultivated in Murashige and Skoog (MS) medium and exposed to different light spectrums of white, red, blue, and red-blue. Results showed that red-blue lights induced the fresh and dry weight, root length, adventitious roots, relative water content, chlorophyll content, protein, flavonoids, and antioxidant enzymes of superoxide dismutase and catalase. Moreover, the highest amount of hydrogen peroxide was observed in seedlings treated with red light. It seems that red-blue light is a suitable lighting spectrum for M. chamomilla cultivation in the closed life support system.
光是太空植物栽培的重要因素。本研究通过叶绿素色素、酶防御系统和抗氧化代谢物分析,研究了光谱对植物生长机制的影响。在 Murashige 和 Skoog(MS)培养基中培养种子,并将其置于白光、红光、蓝光和红蓝光等不同光谱下。结果表明,红蓝光诱导了鲜重和干重、根长、不定根、相对含水量、叶绿素含量、蛋白质、类黄酮以及超氧化物歧化酶和过氧化氢酶等抗氧化酶。此外,用红光处理的幼苗过氧化氢含量最高。由此看来,红蓝光是一种适合在封闭生命维持系统中栽培洋甘菊的照明光谱。
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引用次数: 0
Form-Finding and Free Vibration Analysis of a Class-One Triplex Tensegrity Prism 一类三重张弦棱柱的寻形和自由振动分析
Pub Date : 2023-08-23 DOI: 10.30699/jsst.2021.289596.1349
Milad َAzimi, Samad Moradi
This paper deals with form-finding and free vibration analysis of a pre-stressed class-one triplex tensegrity structure. The form-finding is performed via a two-step procedure, the nodal coordinates connectivity matrix, and structural element force density determination. Accordingly, the possible states for the nodal coordinates and the structural force density of the triplex prism have been determined by trial and error (based on topology and member type knowledge) to satisfy the force density, and equilibrium matrices rank requirements. Based on different structural topologies, the equation of the motion in the frequency domain for free vibration analysis of the system is derived using the spectral element approach and dynamic shape functions. Simulations are provided for different system heights and the top-bottom aria ratios and compared with the finite element method. The numerical simulations in the form of a comparative study of the natural frequencies of triplex tensegrity prism with different heights and cross-sections represent the system’s robustness with different topologies for single or
本文论述了预应力一级三重张弦结构的寻形和自由振动分析。通过节点坐标连接矩阵和结构元素力密度确定这两个步骤来进行寻形。因此,三叉棱柱的节点坐标和结构力密度的可能状态是通过试错(基于拓扑和构件类型知识)确定的,以满足力密度和平衡矩阵等级要求。根据不同的结构拓扑,使用谱元法和动态形状函数推导出了系统自由振动分析的频域运动方程。针对不同的系统高度和上下咏叹调比进行了模拟,并与有限元法进行了比较。通过对不同高度和截面的三重张拉实体棱柱的固有频率进行比较研究,数值模拟体现了系统在不同拓扑结构下的稳健性。
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引用次数: 0
Optimized Dimension Design of Catalytic Chamber of a 10 N Thruster 10n推进器催化室尺寸优化设计
Pub Date : 2023-05-22 DOI: 10.30699/jsst.2023.1332
Sajjad Davari, H. Karimaei, Mohammad Reza Salimi, H. Naseh
,
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引用次数: 0
Thermal Modeling of Lidar Payload in a Remote Sensing Satellite under System Level Considerations with a Review on its Challenges 基于系统级考虑的遥感卫星激光雷达有效载荷热建模及其挑战综述
Pub Date : 2023-05-22 DOI: 10.30699/jsst.2023.1429
M. Khoshsima, Mehran Shahriary, Sajjad Ghazanfarinia, S. Emami, Y. Saffar
The results show that the lidar in cold orbital conditions has a temperature increase of about 38 degrees Celsius due to thermal design. Also, the range of temperature fluctuations before applying thermal design in the cold state of temperature changes in a circuit is about 14 degrees and after designing these fluctuations have been reduced to about 5 degrees. In hot conditions, the temperature conditions have improved a lot after the design and the maximum operating temperature is about 27 degrees the average temperature has decreased by about 22 degrees, while the temperature fluctuations have also decreased by 21 degrees. A significant temperature increase has occurred in the receiver after applying the thermal design in cold conditions, which is still within the allowed range. This is despite the fact that in hot conditions, after applying the thermal design, there was no significant change in the temperature of the receiver. In the case of the reflector, the conditions are completely different, so the minimum temperature in cold conditions has increased by 42 degrees and the maximum temperature has decreased by 7 degrees in hot conditions. In addition, temperature changes have become more uniform in both cases.
结果表明,在冷轨道条件下,由于热设计,激光雷达的温度升高了约38摄氏度。此外,在应用热设计之前,电路在温度变化的冷状态下的温度波动范围约为14度,设计后这些波动已减少到约5度。在高温工况下,设计后温度条件有了很大改善,最高工作温度约为27度,平均温度下降约22度,温度波动也下降了21度。在寒冷条件下应用热设计后,接收器温度显著升高,但仍在允许范围内。尽管在高温条件下,应用热设计后,接收器的温度没有显著变化。以反射镜为例,条件完全不同,因此寒冷条件下的最低温度提高了42度,炎热条件下的最高温度降低了7度。此外,这两种情况下的温度变化变得更加均匀。
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引用次数: 0
Determination of the sensitive volume and critical charge for induction of SEU in nanometer SRAMs 纳米sram中诱导SEU的敏感体积和临界电荷的测定
Pub Date : 2023-05-22 DOI: 10.30699/jsst.2023.1423
Gholamreza Raisali, Masume Soleimaninia, Amir Moslehi
در این پژوهش، حجم حساس و بار بحرانی یک حافظه SRAM با تکنولوژی 65 نانومتری CMOS، به عنوان دو کمیت مهم در محاسبات ترابرد پرتو در رخداد به‌هم‌ریختگی‌ تک‌حادثه‌ای (SEU) که رایج‌ترین رخداد در تحقیقات فضایی محسوب می‌شود، تعیین شد. بدین منظور، ابتدا یک سلول حافظه متشکل از ترانزیستورهای NMOS و PMOS با استفاده از نرم‌افزار Silvaco TCAD شبیه‌سازی شد. برای تعیین دو کمیت مذکور، پرتو با مقادیر مختلف از انتقال خطی انرژی (LET) به نواحی گوناگون ترانزیستورها تابانده شد و ولتاژ خروجی مورد بررسی قرار گرفت. بار بحرانی به عنوان کمترین بار لازم برای تغییر وضعیت منطقی سلول، با انتگرال‌گیری از جریان درین در لحظه تغییر وضعیت ولتاژ خروجی حاصل شد. برای تعیین حجم حساس نیز کمینه LET که در هر نقطه منجر به تغییر در وضعیت منطقی خروجی‌ها می‌شود، معیاری از حساسیت در نظر گرفته شد. نتایج ضمن تطابق با مراجع، مقادیر حجم حساس و بار بحرانی را به ترتیب µm3 054/0 و fC 48/1 نشان دادند.
در این پژوهش، حجم حساس و بار بحرانی یک حافظه Sram با تکنولوژی 65 نانومتری cmos، به عنوان دو کمیت مهم در محاسبات ترابردپرتو در رخداد بههمریختگی تکحادثهای (seu) که رایجترین رخداد در تحقیقات فضای محسوب میشود، تعین ش.بدین منظور، ابتدا یک سلول حافظه متشکل از ترانزیستورهای NMOS و PMOS با استفاده از نرمافزار Silvaco TCAD شبیهسازی شد.برای تعین دو کمیت مذکور، پرتو با مقادیر مختلف از انتقال خطی انرژی (let) به نواحی گوناگون ترانزیستورها تابانده شد و ولتاژ خروجی مورد برسی قرار گرفت.بار بحرانی به عنوان کمترین بار لازم برای تغیر وضعیت منطقی سلول، با انتگرالگیری از جریان درین در لحظه تغیر وضعیت ولتاژ خروجی حاصل شد.برای تعین حجم حساس نیزک مینه let هک در هر نقطه منجر به تغیر در وضعیت منطقی خروجیها میشود، معیاری از حساسیت در نظر گرفته شد.نتایج ضمن تطابق با مراجع، مقادیر حجم حساس و بار بحرانی را به ترتیب µm3 054/0 و fC 48/1 نشان دادند.
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引用次数: 0
Implementation and Comparison of Attitude Estimation Algorithms Using Low-Cost Sensors 基于低成本传感器的姿态估计算法的实现与比较
Pub Date : 2023-05-22 DOI: 10.30699/jsst.2023.1392
M. Navabi, M. Salehi
In a flying system, attitude control is one of the essential subsystems. In this subsystem, estimating the current state is very important to control the state, which is achieved by considering the attitude sensors. Comprehensive research is being done today to reduce the cost of Attitude sensors in applications such as drones, satellite simulation platforms, etc. For this purpose, sensors based on Micro-electromechanical Systems have received much attention due to their small size and low energy consumption. This model of sensors, despite its many advantages, has various noises and disturbances that require the application of fusion and estimation algorithms to obtain an acceptable output. In this research, to determine the attitude of the test platform, data fusion algorithms including complementary filter, Kalman filter, and Extended Kalman filter are implemented on a low-cost sensor. The mentioned estimation methods were implemented on the test platform and by determining the effective parameters in the estimation algorithms, the desired accuracy was obtained. The module obtained in these experiments is comparable to more expensive sensors.
在飞行系统中,姿态控制是重要的子系统之一。在该子系统中,对当前状态的估计是控制系统状态的关键,通过考虑姿态传感器来实现。目前正在进行全面的研究,以降低姿态传感器在无人机、卫星模拟平台等应用中的成本。为此,基于微机电系统的传感器因其体积小、能耗低而备受关注。这种传感器模型,尽管有许多优点,但有各种各样的噪声和干扰,需要应用融合和估计算法来获得可接受的输出。在本研究中,为了确定测试平台的姿态,在低成本传感器上实现了包括互补滤波、卡尔曼滤波和扩展卡尔曼滤波在内的数据融合算法。在测试平台上实现了上述估计方法,通过确定估计算法中的有效参数,获得了所需的精度。在这些实验中获得的模块可与更昂贵的传感器相媲美。
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引用次数: 0
Studying the effects of multi-layer shielding in reducing space radiations exposure of human and electrical components in space missions 研究多层屏蔽在减少空间任务中人体和电气部件的空间辐射暴露中的作用
Pub Date : 2023-05-22 DOI: 10.30699/jsst.2023.1422
S. Shoorian, S. Amir, Hossein Feghhi, H. Jafari, Reza Amjadifard
Protection of astronauts and electronic components in satellites and spacecraft against space rays is one of the most important primary requirements in space missions. In this work, the effect of three materials, aluminum, as the most common material, polyethylene, and a graded-z structure, in the protection of space radiations has been evaluated. The calculations of the dose caused by these radiations on the human body and a silicon piece have been carried out by MCNPX Monte Carlo code. The dose caused by cosmic rays has been calculated after applying shields of aluminum, graded-z structure
保护宇航员和卫星和航天器中的电子元件免受空间射线的伤害是空间任务中最重要的基本要求之一。在这项工作中,评估了三种材料(铝,作为最常见的材料,聚乙烯和z级结构)在保护空间辐射方面的效果。用MCNPX蒙特卡洛程序计算了这些辐射对人体和硅片造成的剂量。在应用z级结构的铝屏蔽层后,计算了宇宙射线引起的剂量
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引用次数: 0
A review of the applications of artificial intelligence in improving the performance of integrated space- air and ground networks 综述了人工智能在提高空间-空气和地面综合网络性能方面的应用
Pub Date : 2023-05-22 DOI: 10.30699/jsst.2023.1405
P. Hajipour, Roghieh Karimzadeh Baee, H. Zarrabi, Roghayeh Doost, L. Mohammadi
According to the technical specifications of the future generations of telecommunication (the fifth generation and later), which should provide new services with very high data rates in the minimum time and wide coverage, as well as the exponential increase in traffic, the use of combined space-air networks Land is essential. It should be noted that the management of this type of combined network has major challenges in providing such services. Meanwhile, the intelligent management of resources in satellite-based hybrid networks will lead to increased capacity and improved service quality. For this purpose, in this article, a comprehensive review of the use of artificial intelligence in the field of satellite communications will be discussed. In the field of intelligent increase of capacity, various factors such as how to configure the network, and how to allocate resources such as spectrum, energy, and power will be investigated with consideration of intelligent interference management. Finally, in the field of service quality improvement, factors such as how to model and intelligently predict traffic, as well as how to deal with harmful environmental conditions, will be presented.
根据未来几代电信(第五代及以后)的技术规范,应该在最短的时间内提供非常高的数据速率和广泛的覆盖范围的新业务,以及业务量的指数增长,使用天空联合网络陆地是必不可少的。应当指出,管理这类综合网络在提供这类服务方面面临重大挑战。同时,基于卫星的混合网络资源的智能化管理将带来容量的增加和服务质量的提高。为此,本文将全面回顾人工智能在卫星通信领域的应用。在智能扩容领域,如何配置网络,如何分配频谱、能源、电力等资源等因素将在智能干扰管理的基础上进行研究。最后,在服务质量改善领域,如何建模和智能预测交通,以及如何处理有害的环境条件等因素将被提出。
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引用次数: 0
期刊
Journal of Space Science and Technology
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