توسعه مدل عددی میله سوخت مجازی تحت شبکه‌های نگهدارنده‌ جدید و قیدهای انتهایی به کمک تحلیل تجربی مودال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران.

2 پژوهشکده راکتور و ایمنی هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، تهران، ایران.

چکیده

یکی از مهم‌ترین پارامترها در تحلیل رفتار ارتعاشی میله سوخت خصوصیات الاستیک شبکه‌های نگهدارنده است. در این پژوهش برای تعیین ضرایب فنریت این نگهدارندهها که مربوط به یک مجتمع سوخت با طرح دایره‌ای است از ترکیب تست‌های آزمایشگاهی و فرمول تئوری بهره گرفته شده است. به منظور صحه‌گذاری مدل عددی یک سامانه تست مودال ویژه این پژوهش طراحی، ساخته و راه‌اندازی شده است. نتایج تست مودال بیانگر آن است که چگالی معادل میله سوخت مجازی به شکل مود طبیعی میله وابسته است. سپس ضریب‌های فنریت نگهدارنده‌های میانی و قیدهای انتهایی به کمک مقایسه نتایج شبیه‌سازی عددی با نتایج تست‌های مودال تعریف شده در حالت‌های مختلف قیدگذاری میله توخالی، اصلاح شده است. نتایج شبیه‌سازی بیانگر این موضوع است که علاوه بر نگهدارنده‌های میانی، قیدهای انتهایی نیز تأثیر بسزایی بر فرکانس‌های طبیعی میله دارد. نتایج تحلیل حساسیت نشان می‌دهد که این ضرایب به شکل مود طبیعی میله وابسته است. همچنین نتایج نشان می‌دهد که با بروزرسانی ضرایب فنریت نگهدارنده‌های میانی و انتهایی به مقدار قابل ملاحظه‌ای خطای تخمین فرکانس‌های طبیعی کاهش و تخمین شکل مودهای طبیعی بر اساس معیار اطمینان مودال بهبود یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Model Development of Dummy Fuel Rod Under New Spacer Grids and End Constraints Using Experimental Modal Analysis

نویسندگان [English]

  • Reza Amirian 1
  • Gholamreza Zarepoor 1
  • Mansour Talebi 2
1 Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran
2 Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute, Tehran
چکیده [English]

One of the most important parameters in the analysis of the vibration behavior of the fuel rod is the elastic properties of spacer grids. In this research the combination of laboratory tests and theoretical formula was used to determine the elastic coefficients of these spacers that is related to fuel assembly with circular design. In order to validate the numerical model a spatial modal test set-up has been designed, constructed and set up to perform the modal test. The modal test results indicate that equivalent density of the dummy fuel rod depends on the natural mode of the rod. Then, the spring coefficients of the middle spacers and end constraints have been modified by comparing the results of numerical simulation with the results of modal tests defined in different supporting states of the hollow rod. The simulation results show that in addition to the middle spacers, also the end constraints have a significant effect on the natural frequencies of the rod. The Sensitivity Analysis results show that these coefficients depend on the natural mode of the rod. In addition, the results show that by updating the spring coefficients of the middle spacers and end constraints the estimation error of natural frequencies has been significantly reduced and the estimation of natural mode shapes based on the modal assurance criterion has been significantly improved.

کلیدواژه‌ها [English]

  • Numerical and Experimental Modal Analysis
  • Fuel Rod
  • Spacer Grid
  • Natural Frequency and Mode Shape
  • Sensitivity Analysis

مراجع

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