The document analyzes the chaotic motions that can occur for tethered satellite systems with low thrust. It describes the system and assumptions, presents the motion equations, and identifies stationary solutions. Orbital eccentricity and out-of-plane oscillations are shown to induce chaos if they cause an unstable equilibrium condition. The choice of thrust level, satellite masses, and tether length must satisfy conditions to ensure regular in-plane motion even in an elliptic orbit.
This document discusses collective nouns, which are nouns that can be singular or plural depending on how the group is acting. It provides examples of collective nouns for groups of people like "class" or "jury" and groups of animals like "flock" or "herd." It explains that collective nouns take singular verbs when the group is acting as a unit and plural verbs when members are acting individually. An exercise tests identifying the correct collective noun for groups like a school of fish or herd of cows. In conclusion, the document provides a definition and examples of common collective nouns.
1. The document analyzes the dynamics of a satellite with an elastic tether system. It develops mathematical models to describe the oscillations of the satellite caused by changes in the magnitude and direction of the tether force.
2. Equations of motion are derived for the rotating tethered satellite system using Lagrange's equations. Approximate analytical solutions are also obtained for oscillations of the satellite under the influence of the elastic tether.
3. The dynamics of the elastic tether itself are also modeled through equations that describe vibrations of the tether near the local vertical.
The document analyzes the chaotic motions that can occur for tethered satellite systems with low thrust. It describes the system and assumptions, presents the motion equations, and identifies stationary solutions. Orbital eccentricity and out-of-plane oscillations are shown to induce chaos if they cause an unstable equilibrium condition. The choice of thrust level, satellite masses, and tether length must satisfy conditions to ensure regular in-plane motion even in an elliptic orbit.
This document discusses collective nouns, which are nouns that can be singular or plural depending on how the group is acting. It provides examples of collective nouns for groups of people like "class" or "jury" and groups of animals like "flock" or "herd." It explains that collective nouns take singular verbs when the group is acting as a unit and plural verbs when members are acting individually. An exercise tests identifying the correct collective noun for groups like a school of fish or herd of cows. In conclusion, the document provides a definition and examples of common collective nouns.
1. The document analyzes the dynamics of a satellite with an elastic tether system. It develops mathematical models to describe the oscillations of the satellite caused by changes in the magnitude and direction of the tether force.
2. Equations of motion are derived for the rotating tethered satellite system using Lagrange's equations. Approximate analytical solutions are also obtained for oscillations of the satellite under the influence of the elastic tether.
3. The dynamics of the elastic tether itself are also modeled through equations that describe vibrations of the tether near the local vertical.
Development of a mathematical model describing the motion of the space tether system.
Creation of the program complex designed to analyze the dynamics of the space tether system.
In this presentation the following topics are covered:
- Active debris removal techniques
- Tethered space tug
- Mathematical model
- Numerical simulation and analysis
- Results and conclusion
Presentation for the 5th Eucass - European Conference for Aerospace Sciences - Munich, Germany, 1-4 July 2013.
The document discusses the attitude dynamics of a re-entry vehicle (RV) in planetary atmospheres. It presents the following:
1) Equations of motion for the RV's angular momentum, unit vectors describing its orientation, and acceleration due to aerodynamic and gravitational forces.
2) Equations of motion for the RV's mass center in terms of its velocity, altitude, trajectory inclination angle, and dynamic pressure.
3) Solutions to the undisturbed equations of motion, including an energy integral and general solutions involving elliptic functions for different forms of the restoring aerodynamic moment.
This paper presents the study of the dynamics and control of an axial variable structure satellite (asymmetric platform and an axisymmetric rotor). Inertia moments of the rotor change slowly over time. The dynamics of the satellite is described by using ordinary differential equations with Serret-Andoyer canonical variables. For undisturbed motion, the stationary solutions are found, and their stability is studied. The control law is obtained for the satellite with variable structure on the basis of the stationary solutions. By means of computer numerical simulations, we have shown that the motion of the satellite controlled by founded internal torque is stable.
The document discusses models and experiments to analyze the tip-off rate dynamics of CubeSats during separation from deployers. A simplified model and complex ADAMS model were developed to simulate the effects of parameters like center of mass position, spring stroke, and gap between guide rails on tip-off rate. Ground experiments using laser sensors to measure angular velocities of a 3U CubeSat mock-up showed results that agreed satisfactorily with simulations. The models and experiments allow estimating tip-off rates to help design CubeSat deployers that minimize initial angular velocities.
This document discusses spacecraft attitude dynamics and control. It begins by introducing typical modes of spacecraft operation like attitude acquisition and nominal earth pointing. It then covers key topics like reference frames, attitude representation using Euler angles, quaternions and direction cosine matrices, orbital elements, external disturbances, and spacecraft attitude dynamics equations. Quaternion algebra is described for representing attitude and performing successive rotations between frames. Overall, the document provides an overview of fundamental concepts for analyzing and controlling a spacecraft's orientation in space.
This document discusses active suspension systems for vehicles. It provides information on different types of active suspension technologies used by various car manufacturers. These include magnetic ride control used in Cadillacs, electronic air suspension in Range Rovers, and active body control in Mercedes Benz cars. The document also covers quarter car models, optimal control approaches like LQR control, and active suspension control strategies. Key active suspension technologies are described in detail, including how they work and their benefits in improving ride comfort and vehicle handling.
Презентация к семинару кафедры теоретической механики. По материалам статьи “Detumbling Space Debris Using Modified Yo-Yo Mechanism” (Юдинцев В. В.,
Асланов В. С.) Journal of Guidance, Control, and Dynamics, Vol. 40, No. 3. https://arc.aiaa.org/doi/abs/10.2514/1.G000686
(2017), pp. 714-721.
A presentation by Kim Cofino given to Qatar Academy staff in February 2009. Find more details on the presentation wiki: http://the21stcenturylearner.wikispaces.com
A Guide to SlideShare Analytics - Excerpts from Hubspot's Step by Step Guide ...SlideShare
This document provides a summary of the analytics available through SlideShare for monitoring the performance of presentations. It outlines the key metrics that can be viewed such as total views, actions, and traffic sources over different time periods. The analytics help users identify topics and presentation styles that resonate best with audiences based on view and engagement numbers. They also allow users to calculate important metrics like view-to-contact conversion rates. Regular review of the analytics insights helps users improve future presentations and marketing strategies.
Each month, join us as we highlight and discuss hot topics ranging from the future of higher education to wearable technology, best productivity hacks and secrets to hiring top talent. Upload your SlideShares, and share your expertise with the world!
Not sure what to share on SlideShare?
SlideShares that inform, inspire and educate attract the most views. Beyond that, ideas for what you can upload are limitless. We’ve selected a few popular examples to get your creative juices flowing.
SlideShare is a global platform for sharing presentations, infographics, videos and documents. It has over 18 million pieces of professional content uploaded by experts like Eric Schmidt and Guy Kawasaki. The document provides tips for setting up an account on SlideShare, uploading content, optimizing it for searchability, and sharing it on social media to build an audience and reputation as a subject matter expert.
Development of a mathematical model describing the motion of the space tether system.
Creation of the program complex designed to analyze the dynamics of the space tether system.
In this presentation the following topics are covered:
- Active debris removal techniques
- Tethered space tug
- Mathematical model
- Numerical simulation and analysis
- Results and conclusion
Presentation for the 5th Eucass - European Conference for Aerospace Sciences - Munich, Germany, 1-4 July 2013.
The document discusses the attitude dynamics of a re-entry vehicle (RV) in planetary atmospheres. It presents the following:
1) Equations of motion for the RV's angular momentum, unit vectors describing its orientation, and acceleration due to aerodynamic and gravitational forces.
2) Equations of motion for the RV's mass center in terms of its velocity, altitude, trajectory inclination angle, and dynamic pressure.
3) Solutions to the undisturbed equations of motion, including an energy integral and general solutions involving elliptic functions for different forms of the restoring aerodynamic moment.
This paper presents the study of the dynamics and control of an axial variable structure satellite (asymmetric platform and an axisymmetric rotor). Inertia moments of the rotor change slowly over time. The dynamics of the satellite is described by using ordinary differential equations with Serret-Andoyer canonical variables. For undisturbed motion, the stationary solutions are found, and their stability is studied. The control law is obtained for the satellite with variable structure on the basis of the stationary solutions. By means of computer numerical simulations, we have shown that the motion of the satellite controlled by founded internal torque is stable.
The document discusses models and experiments to analyze the tip-off rate dynamics of CubeSats during separation from deployers. A simplified model and complex ADAMS model were developed to simulate the effects of parameters like center of mass position, spring stroke, and gap between guide rails on tip-off rate. Ground experiments using laser sensors to measure angular velocities of a 3U CubeSat mock-up showed results that agreed satisfactorily with simulations. The models and experiments allow estimating tip-off rates to help design CubeSat deployers that minimize initial angular velocities.
This document discusses spacecraft attitude dynamics and control. It begins by introducing typical modes of spacecraft operation like attitude acquisition and nominal earth pointing. It then covers key topics like reference frames, attitude representation using Euler angles, quaternions and direction cosine matrices, orbital elements, external disturbances, and spacecraft attitude dynamics equations. Quaternion algebra is described for representing attitude and performing successive rotations between frames. Overall, the document provides an overview of fundamental concepts for analyzing and controlling a spacecraft's orientation in space.
This document discusses active suspension systems for vehicles. It provides information on different types of active suspension technologies used by various car manufacturers. These include magnetic ride control used in Cadillacs, electronic air suspension in Range Rovers, and active body control in Mercedes Benz cars. The document also covers quarter car models, optimal control approaches like LQR control, and active suspension control strategies. Key active suspension technologies are described in detail, including how they work and their benefits in improving ride comfort and vehicle handling.
Презентация к семинару кафедры теоретической механики. По материалам статьи “Detumbling Space Debris Using Modified Yo-Yo Mechanism” (Юдинцев В. В.,
Асланов В. С.) Journal of Guidance, Control, and Dynamics, Vol. 40, No. 3. https://arc.aiaa.org/doi/abs/10.2514/1.G000686
(2017), pp. 714-721.
A presentation by Kim Cofino given to Qatar Academy staff in February 2009. Find more details on the presentation wiki: http://the21stcenturylearner.wikispaces.com
A Guide to SlideShare Analytics - Excerpts from Hubspot's Step by Step Guide ...SlideShare
This document provides a summary of the analytics available through SlideShare for monitoring the performance of presentations. It outlines the key metrics that can be viewed such as total views, actions, and traffic sources over different time periods. The analytics help users identify topics and presentation styles that resonate best with audiences based on view and engagement numbers. They also allow users to calculate important metrics like view-to-contact conversion rates. Regular review of the analytics insights helps users improve future presentations and marketing strategies.
Each month, join us as we highlight and discuss hot topics ranging from the future of higher education to wearable technology, best productivity hacks and secrets to hiring top talent. Upload your SlideShares, and share your expertise with the world!
Not sure what to share on SlideShare?
SlideShares that inform, inspire and educate attract the most views. Beyond that, ideas for what you can upload are limitless. We’ve selected a few popular examples to get your creative juices flowing.
SlideShare is a global platform for sharing presentations, infographics, videos and documents. It has over 18 million pieces of professional content uploaded by experts like Eric Schmidt and Guy Kawasaki. The document provides tips for setting up an account on SlideShare, uploading content, optimizing it for searchability, and sharing it on social media to build an audience and reputation as a subject matter expert.
Обзор работ 7-ой Европейской конференции по космическому мусору (офис центра управления полетами ЕКА, Дармштадт, Германия, 18-21 апреля 2017 г)
Презентация к семинару кафедры теоретической механики Самарского университета (16.05.17)
Основы языка Питон: функции, элементы функционального программирования, списочные выражения, генераторы. Презентация к лекции курса "Технологии и языки программирования".
The document proposes using an Autonomous Docking Module (ADM) attached to a space tug by tether to remove orbital debris. The ADM would use a probe-cone mechanism to dock with the target debris, a spent orbital stage, without its cooperation. A mathematical model is developed to simulate the docking process between the ADM and tumbling target. Further simulation and development of rendezvous scenarios and a testbed mission are recommended to validate the concept.
The document discusses nanosatellite deployers, which isolate CubeSats from the launch vehicle and main payload and deploy them into orbit. It describes several common deployer types, including the P-POD, ISI-POD, X-POD, NANORACKS, RSC-POD, and CSD. The document summarizes simulations and experiments that analyzed factors affecting CubeSats' tip-off rates after deployment, such as their mass properties, spring stroke distances, and clearances between guide rails. Ground and microgravity flight tests indicated 3U CubeSats typically have maximum rotational rates under 10°/s after deployment, while 1U CubeSats' rates
The document describes the chaotic behavior that can occur in a system consisting of a space tug, viscoelastic tether, and space debris. A mathematical model is developed to describe the transverse and longitudinal oscillations of the tether. The model shows that chaos is possible when the longitudinal oscillations are perturbed. Poincare sections are used to reveal a stochastic layer in the system's motion due to damping in the tether. The results suggest that chaos can be observed in the attitude motion of the tethered tug-debris system caused by longitudinal oscillations of the viscoelastic tether.
Презентация для IV Всероссийской научно-технической
конференции "Актуальные проблемы ракетно-космической техники» ("IV Козловские чтения")". г. Самара, 14-17 сентября 2015 г.
The document discusses active debris removal in space using tethered towing. The authors have developed a mathematical model of the attitude motion of a debris-tether-tug system. The model accounts for factors such as flexible appendages on the debris, fuel residuals, tether properties, and environmental forces. The authors aim to further study the capture dynamics of debris and stabilization after capture, and create a comprehensive model covering all stages from initial capture to atmospheric reentry.
Определение параметров средств отделения створок головного обтекателя ракеты-носителя. Презентация к лекции курса "Основы синтеза механических систем".
1. Асланов Владимир Степанович
aslanov_vs@mail.ru
http://aslanov.ssau.ru
Написание научной статьи
на английском языке
Личный взгляд
Кафедра теоретической механики
www.termech.ru
Самарский государственный аэрокосмический университет
им. академика С. П. Королѐва
www.ssau.ru
2013 год
2. 1. Основные положения
1. Цель написания статьи
Чтобы читали?
Чтобы напечатали?
2. Статья - это товар
Лучший по всем показателям
и статья будет иметь успех у читателей.
3. Показатели качества
Научные результаты.
Простота и логичность изложения.
Наглядные и честные иллюстрации.
Дизайн статьи.
3. 2. Язык написания статьи
1. Хотите иметь аудиторию читателей, равную 80-90 %
ученых в Вашей области знаний в мире,
пишите на английском языке.
2. Аналоги
Латынь - язык всех медиков.
Математические символы - едины для всех.
Химические формулы - едины для всех.
3. Английский язык
Единый язык общения ученых в мире.
4. Пишите статью на английском языке самостоятельно
Иначе никогда не научишься.
4. 3. Выбор журнала
1. Журналы делятся на открытые и закрытые.
2. Открытые журналы
Платные для автора статьи.
Открытые для читателей статью.
3. Закрытые журналы
Бесплатные для автора статьи (платные с
дополнительными свойствами).
Закрытые для читателей (~35 euro).
Имеют, как правило, более высокий рейтинг.
4. Выберите свой журнал
Близкий Вам по стилю.
Отвечающий Вашему уровню.
5. 4. Особенности ангоязычных журналов
1. Журналы издаются крупными издательствами:
Springer, Elsiever, The American Institute of
Aeronautics and Astronautics (AIAA)…
2. Требования практически одинаковые
Статья подается по интернету.
Статьи не редактируются.
Срок опубликования составляет 6-9 месяцев.
Рецензентов выбирает автор: 2- 8 известных
по публикациям ученых.
3. Отрицательная рецензия приближает автора к истине.
6. 5. Как повысить рейтинг статьи
1. Напишите хорошую статью.
2.1. Напишите статью с ошибками
2.2. Плагиат недопустим
2.3. Не повторяйте в статьях ранее опубликованное.
Будет много ссылок ==> A note, a comment.
3. Делайте много ссылок
На чужие современные статьи.
На свои англоязычные статьи.
4. Рейтинг статьи не самоцель.
7. 6. Структура статьи
1. Название (Title)
Короткое и точно отражающее содержание,
и статья будет доставлена потенциальному читателю.
2. Введение (Abstract)
Отдельное произведение, всегда в открытом доступе.
Бесплатная реклама статьи (товара).
Хорошо написанное будет привлекать читателей.
3. Ключевые слова (Keywords)
Пароль для поисковых систем.
8. 6. Структура статьи
4. Введение (Introduction)
Первая часть: состояние проблемы – много ссылок.
Вторая часть : актуальность и цель статьи.
Третья часть : структура статьи по разделам (Guide).
По написанию - самая сложная часть статьи.
5. Основное тело статьи (Main body)
Ничего лишнего, уводящего от цели статьи.
Материал не должен вызывать сомнения в
достоверности Ваших результатов.
6. Заключение (Conclusion)
О решения поставленной проблемы.
Пишется весьма кратко.
9. 6. Структура статьи
7. Благодарности (Acknowledgments)
8. Ссылки на литературы (References)
Должно быть много ==> Вы владеете необходимыми
знаниями в этой области.
Должно быть много ==> оказываете уважение
к коллегам, в том числе рецензентам.
Включите статьи последних лет ==> подчеркивает
актуальность Вашей работы.
9. Иллюстрации (Illustrations)
Наглядные, содержащие все исходные данные,
необходимые для проверки расчетов или для
выполнения повторного эксперимента.
10. 7. Заключение
1. Все вышесказанное относится к понятию «форма»
Написание статьи – это ремесло.
2. Научный результат относится к понятию «содержание»
Получение новых знаний – это искусство.
_________________________________________
Большое спасибо за Ваше внимание!
Асланов Владимир Степанович
aslanov_vs@mail.ru
http://aslanov.ssau.ru