تحلیل دینامیکی سیستم سورتمه جرم متغیر تحت نیروهای متغیر

نوع مقاله : گرایش دینامیک، ارتعاشات و کنترل

نویسندگان

1 دانشجوی دکتری، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران

2 نویسنده مسئول: دانشیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران

3 دانشجوی کارشناسی ارشد، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران

چکیده

از سیستم سورتمه به‌منظور آزمایش سازه‌های ضد نفوذ، آزمون پرش صندلی خلبان و تجهیزات فضایی استفاده می‌شود که فناوری آن در اختیار تعداد اندکی از کشورهای پیشرفته است. در این پژوهش، تحلیل دینامیکی نیروهای وارد بر یک نمونه از این سیستم، موردبررسی قرار گرفته است. نیروهای مؤثر وارد بر سورتمه شامل نیروی پیشرانه، نیروی پسا و برآ و نیروی اصطکاک است که همگی متغیر می‌باشند. به‌منظور به دست آوردن نیروی پیشرانه با توجه به مشخصات عملکردی و هندسی سورتمه طراحی‌شده، اقدام به طراحی گرین موتور سورتمه جهت رسیدن به سرعت 0/85 ماخ در مدت یک ثانیه شده است. پس از استخراج معادلات حاکم جهت به دست آوردن نیروی پیشرانه، با استفاده از برنامه‌نویسی، تغییرات نیروی پیشرانه در طول زمان سوزش به دست آورده شده و فرموله می‌شود. در مرحله بعد برای به دست آوردن نیروهای برآ و پسا از شبیه‌سازی عددی استفاده‌ شده و پس از صحت‌سنجی روش عددی با پژوهشی تجربی، مقادیر نیروی پسا و برآ در سرعت‌های مختلف استخراج و فرموله می‌گردد. در ادامه با توجه به تغییرات جرم سورتمه در مدت سوزش، نیروی اصطکاک بین ریل و کفشک سورتمه به دست آورده می‌شود. در نهایت معادله دیفرانسیل سیستم استخراج و رفتار دینامیکی سیستم تحلیل می‌شود. نتایج نشان می‌دهد که بیشترین فشار در قسمت داخلی کفشک واردشده که در سرعت‌های بالا می‌تواند منجر به سایش و خرابی سطح ریل شده و منجر به انحراف سورتمه از مسیر ریل گردد. همچنین میزان نیروی اصطکاک در برابر سایر نیروها قابل صرف‌نظر است.

کلیدواژه‌ها


عنوان مقاله [English]

Dynamic Analysis of a Variable Mass Sled System under Variable Forces

نویسندگان [English]

  • Mohammad Reza Najafi 1
  • Saeed Mahjoub Moghadas 2
  • Ali Rahimi 3
1 Ph.D. Student, Department of Mechanical Engineering, Faculty of Technology and Engineering, Imam Hossein University, Tehran, Iran
2 Corresponding author: Associate Professor, Department of Mechanical Engineering, Faculty of Technology and Engineering, Imam Hossein University, Tehran, Iran
3 MSc Student, Department of Mechanical Engineering, Faculty of Technology and Engineering, Imam Hossein University, Tehran, Iran
چکیده [English]

The sled system is used to test anti-penetration structures, ejection seat, and spacecraft equipment that its technology is owned by a few developed countries. In this research, the dynamic analysis of applied forces on the system has been investigated. The effective forces on the sled include propulsive force, drag force, lift force, and friction force, which are all variable. To obtain the propulsive force according to the functional and geometric specifications of the designed sled, the grain engine design has been carried out to reach 0.85 Mach in a second. After extracting the governing equations for extracting the propulsive force, the changes of the propulsive force during the combustion time were obtained and formulated. At the next step, numerical simulation is used to obtain the lift and drag forces and after validating the numerical solution with experimental research, the values of drag and lift forces at different speeds are extracted and formulated. Next, due to sled mass variations during the combustion step, the friction force between the rail and the slipper is obtained. Finally, the differential equation and dynamic behavior of the system are analyzed. The results show that amount of friction force is negligible in comparison with other forces. Also, the highest pressure is applied to the inner part of the slipper, which can lead to wear and damage of the rail surface at high speeds and lead to the sled deviating from the rail track.

کلیدواژه‌ها [English]

  • Sled
  • Drag forces
  • Lift force
  • Dynamic analysis
  • Slipper
  • Trust force

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دوره 18، شماره 1 - شماره پیاپی 67
شماره پیاپی 67، فصلنامه بهار
خرداد 1401
صفحه 123-136
  • تاریخ دریافت: 24 تیر 1400
  • تاریخ بازنگری: 16 آبان 1400
  • تاریخ پذیرش: 23 آبان 1400
  • تاریخ انتشار: 01 اردیبهشت 1401