مجله علمی صوت و ارتعاش

مجله علمی صوت و ارتعاش

تحلیل ارتعاشات آزاد یک پوسته استوانه‌ای با روش‌های تجربی و عددی تحت تاثیر افزایش دما

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی مکانیک. دانشگاه پیام نور .تهران. ایران
2 گروه مهندسی مکانیک، دانشگاه بوعلی سینا، همدان،ایران
3 گروه مهندسی مکانیک، دانشگاه پیام نور، تهران، ایران
4 گروه مهندسی مکانیک، دانشگاه بوعلی سینا، همدان، ایران
چکیده
پوسته­های استوانه­ای در بسیاری از کاربردهای صنعتی در طول عمر خود تحت تأثیر شرایط دمایی مختلفی قرار می­گیرند که این امر باعث ایجاد تنش­های حرارتی و اثرگذاری بر روی مشخصات ارتعاشی و مقادیر فرکانس­های طبیعی سازه­ می­گردد. لذا در این تحقیق تأثیرات افزایش دما بر روی فرکانس­های طبیعی پوسته استوانه­ای از طریق آزمون آکوستیک بصورت تجربی مورد بررسی قرار گرفته است. به همین منظور ابتدا فرکانس­های طبیعی یک پوسته استوانه‌ای شکل با استفاده از نرم­افزار کامسول استخراج می‌گردد. سپس با استفاده از آزمون ضربه چکش، فرکانس­های طبیعی پوسته تعیین می‌شوند. در ادامه پوسته استوانه­ای در داخل اتاق آکوستیک قرار گرفته و به وسیله یک بلندگو در داخل اتاق آکوستیک تحریک می‌شود. در این حالت تراز فشار صوتی[i] توسط میکروفون داخل پوسته اندازه­گیری شده و با آنالیز فرکانسی، مقدار فرکانس­های طبیعی سیستم در دمای محیط اندازه­گیری می­شود. اعتبار روش آزمون آکوستیک ارائه شده در این مقاله با نتایج آزمون مودال و حل عددی در دمای محیط مورد ارزیابی و تأیید قرار می­گیرد. نهایتاً پوسته در یک محفظه حرارتی تا دمای بیش از 80 درجه سانتی‌گراد گرم شده و مجدداً آزمون آکوستیک تکرار می‌شود. نتایج بیانگر کاهش فرکانس­های طبیعی سیستم بر اثر افزایش دما می­باشند.
 
[i]  Sound pressure level, SPL
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Free vibration analysis of a cylindrical shell by experimental and numerical methods under the influence of temperature increase

نویسندگان English

Reza Ahmadi 1
Maisam Parhikhteh 2
omid mohammadpou 3
Mahdi karimi 4
1 Department of Mechanical Engineering. payame Noor University (PNU).Tehran.Iran
2 Department of Mechanical Engineering. Bu-Ali Sina University, Hamedan, Iran
3 Department of Mechanical Engineering. payame Noor University(PNU).Tehran.Iran
4 Department of Mechanical Engineering. Bu-Ali Sina University, Hamedan, Iran
چکیده English

In many industrial applications, cylindrical shells are affected by different temperature conditions during their lifetime, yielding to the thermal stresses and variation of structural vibration characteristics and natural frequencies. Therefore, in this research, the effects of temperature increase on the natural frequencies of the cylindrical shell have been investigated experimentally through acoustic testing. For this purpose, first, the natural frequencies of a cylindrical shell are extracted utilizing Comsol software. Then, the natural frequencies of the shell are determined by the impact hammer test. Next, the cylindrical shell is placed into the acoustic room and is stimulated by a speaker inside the acoustic room. In this case, the sound pressure level is measured by the microphone inside the shell, and the natural frequencies of the system are measured by the frequency analysis at ambient temperature. Validation of the acoustic test presented in this article is evaluated and verified by modal test and numerical solution at ambient temperature. Finally, the shell is heated in a thermal chamber to a temperature of more than 80ºC and the acoustic test is repeated again. The results indicate that the natural frequencies of the system decrease as the temperature increases.

کلیدواژه‌ها English

Acoustic test
Natural frequency of the system
Cylindrical shell
Modal analysis
Sound pressure level
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