محاسبة طول عمر بالستیکی ماهواره توسط روش‌های عددی تحت تأثیر زاویة حمله و گشتاورهای ائرودینامیکی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیات علمی / دانشکدة علوم و فنون نوین، دانشگاه تهران

2 کارشناس ارشد / دانشکدة علوم و فنون نوین، دانشگاه تهران

چکیده

در این مقاله روشی تحلیلی برای محاسبة ضرایب ائرودینامیکی برحسب زاویة حملة ماهواره در مدارهای نزدیک به سطح زمین معرفی شده است. از جمله نیروهای اغتشاشی که بر ماهواره‌های نزدیک به سطح زمین وارد می‌شود، نیروهای ائرودینامیکی است که مدلسازی آنها به‌دلیل وابستگی به اطلاعاتی جامع دربارة مواردی چون هندسة ماهواره، چگالی اتمسفر، دما، زمان مورد نظر، سرعت و ضرایب ائرودینامیکی بسیار دشوار است. در این مقاله طول عمر بالستیکی ماهواره در زوایای حملة متفاوت با استفاده از روش عددی کاوئل، تحت تأثیر گشتاورهای ائرودینامیکی به‌عنوان تابعی از زاویة حمله و محدودة پایداری ماهواره تحت تأثیر نیروهای اختلالی بررسی و محاسبه شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Calculating satellite ballistic lifetime with numerical method due to angle of attack and aerodynamics moments

نویسندگان [English]

  • Amir Reza Kosari 1
  • Marzieh Dolatabadi Farahani 2
  • Mehdi Fakoor 1
  • Mohammad Ali Amiri Atashgah 1
چکیده [English]

This paper describes an analytical solution for calculating the aerodynamic coefficients and forces that are depending on the satellites angle of attack in LEO orbit. Aerodynamics forces are one of the perturbing forces which are government forces in LEO orbit and they can reduce satellite life time. Unfortunately  these forces are function of geometric parameter, density of atmosphere, temperature, time, velocity and force coefficient so simulation of these kinds of forces are too hard and most of method which use for modeling have low Accuracy, because of this we could not predict satellite lifespan correctly.  In this paper we produce new approach for solving this issues which improve Accuracy by solving equations as a function of angle of attack. We calculate satellite ballistic lifetime with numerical method (Cowell method) and aerodynamics torque simulates as function of angle of attack. At the end our simulation validated with STK8 software which shows good similarity of our method with STK8 software.

کلیدواژه‌ها [English]

  • satellite
  • aerodynamic force
  • aerodynamic torque
  • angle of attack
  • ballistic lifetime

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