تحلیل تجربی و عددی تأثیر کاهش دما روی فرکانس‌های طبیعی پوسته استوانه‌ای با استفاده از تست آکوستیکی

نوع مقاله : گرایش دینامیک، ارتعاشات و کنترل

نویسندگان

1 دانشجوی دکتری، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه بوعلی سینا ، همدان، ایران

2 نویسنده مسئول: استادیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه بوعلی سینا ، همدان، ایران

3 استادیار، گروه مهندسی مکانیک، دانشگاه پیام نور، تهران، ایران

چکیده

با توجه به اهمیت تأثیر کاهش دما در سازه‌های گوناگون صنعتی به‌ویژه صنایع هوافضا، در این مقاله به تحلیل تجربی و عددی اثر سرما روی فرکانس‌های طبیعی یک پوسته استوانه‌ای پرداخته‌شده است. پس از ساخت یک نمونه پوسته استوانه‌ای فولادی، ابتدا به روش غیر تماسی و با استفاده از اتاق تست آکوستیک و با ارسال امواج آکوستیکی، سازه مذکور تحریک‌شده و فرکانس‌های طبیعی آن با آنالیز فرکانسی سطح فشار صوتی اندازه‌گیری شده در دمای محیط استخراج شدند. همچنین برای صحه‌گذاری روش تست، مقایسه نتایج حاصله با نتایج به‌دست‌آمده از روش تماسی چکش مودال و نتایج شبیه‌سازی المان محدود در نرم‌افزار کامسول انجام شد و تطابق مناسبی بین آن‌ها مشاهده گردید. سپس پوسته به محفظه حرارتی سرد منتقل‌شده تا به دمای کمتر از منفی 70 درجه سانتی‌گراد برسد و مجدداً آزمایش در اتاق آکوستیک تکرار شده و تأثیر افت دما روی مقادیر فرکانس‌های طبیعی سازه به دو روش تجربی و عددی موردمطالعه قرار گرفت. نتایج نشان می‌دهند که با کاهش دما، مقدار فرکانس‌های طبیعی سازه، افزایش می‌یابند. همچنین از نتایج حل عددی مشاهده می‌شود که میزان حساسیت هر یک از فرکانس‌های طبیعی سازه نسبت به تغییرات دما یکسان نمی‌باشد. به‌طور مثال بیشترین حساسیت به دما مربوط به مودهای پنجم و هفتم و کمترین حساسیت مربوط به مودهای هشتم و ششم می‌باشد.

چکیده تصویری

تحلیل تجربی و عددی تأثیر کاهش دما روی فرکانس‌های طبیعی پوسته استوانه‌ای با استفاده از تست آکوستیکی

تازه های تحقیق

  • فرکانس‌های طبیعی
  • پوسته استوانه‌ای
  • آنالیز آکوستیکی پوسته
  • کاهش دما

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and Numerical Analysis of the Effects of Temperature Reduction on the Natural Frequencies of Cylindrical Shell Using Acoustic Test

نویسندگان [English]

  • Maisam Parhikhteh 1
  • Mahdi Karimi 2
  • Reza Ahmadi 3
  • Omid Mohammadpour 3
1 Ph.D. Student, Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
2 Corresponding author: Assistant Professor, Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
3 Assistant Professor, Department of Mechanical Engineering, Payame Noor University, Hamedan, Iran
چکیده [English]

Considering the importance of the effect of temperature reduction in many industrial structures, especially aerospace industries, in this article, the experimental and numerical analysis of the effect of cold on the natural frequencies of a cylindrical shell has been discussed. After the construction of a cylindrical steel shell, first it was excited by non-contact method and using the acoustic test room and by sending acoustic waves, and its natural frequencies were measured by frequency analysis of the sound pressure level at environmental temperature. Also, to validate the test method, the results were compared with the results obtained by the modal hammer contact method and the finite element simulation results in COMSOL software and it was shown a good adaptation between them. Next, the shell was transferred to the cold thermal chamber to reach a temperature of less than minus 70 degrees Celsius, and the test was repeated in the acoustic room and the effect of temperature drop on the values of the natural frequencies of the structure were studied by both experimental and numerical methods. The results show that as the temperature decreases, the natural frequencies of the structure increase. It can also be seen from the results of the numerical solution that the sensitivity of each of the natural frequencies of the structure is not the same to temperature changes. For example, the highest sensitivity to temperature is related to the fifth and seventh modes and the lowest sensitivity is related to the eighth and sixth modes.

کلیدواژه‌ها [English]

  • Cylindrical shell
  • Acoustic
  • Natural frequencies
  • Modal analysis
  • Sound pressure level


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مکانیک هوافضا
دوره 20، شماره 4 - شماره پیاپی 78
شماره پیاپی 78، فصلنامه زمستان
اسفند 1403
صفحه 87-102

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سابقه مقاله

  • تاریخ دریافت: 25 شهریور 1403
  • تاریخ بازنگری: 27 مهر 1403
  • تاریخ پذیرش: 13 آبان 1403
  • تاریخ انتشار: 01 اسفند 1403

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