Shahsavari, M., Asgari, M. (2016). Optimization of electronic boards equipped with the BGA package to improve the response in random vibration. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(4), 701-710.
Milad Shahsavari; M. Asgari. "Optimization of electronic boards equipped with the BGA package to improve the response in random vibration". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9, 4, 2016, 701-710.
Shahsavari, M., Asgari, M. (2016). 'Optimization of electronic boards equipped with the BGA package to improve the response in random vibration', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(4), pp. 701-710.
Shahsavari, M., Asgari, M. Optimization of electronic boards equipped with the BGA package to improve the response in random vibration. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2016; 9(4): 701-710.
Optimization of electronic boards equipped with the BGA package to improve the response in random vibration
1MSc Student, Department of Islamic Azad University, Tehran North Branch, Tehran, Iran
2- Assistant Professor, Department of K.N.TOOSI University of technology, Tehran, Iran
Abstract
In this paper deflection and free vibration of sandwich panel is studied. The core of Sandwich panels is made of hexagonal honeycomb and faces are made of two different materials of Carbon Fiber Reinforced Plastic and K-aryl/epoxy covering. The governing equations are deduced from the First order Sheer Deformation Theory (FSDT) and they are solved using Generalized Differential Quadrature Method (GDQM). The classical method in the references is used to verify the DQ method and to show that the applied GDQM method has a good results with compared to the references. Deflection of sandwich panel is investigated with two different load types. Finally natural frequency for the first 4 modes and the two different faces materials are calculated and the effect of various lengths to core thickness ratios and faces to honeycomb core thickness ratios are studied. Further, the effect of foundation stiffness coefficient on deflection and natural frequency are showed.
بهینه سازی بوردهای الکترونیکی مجهز به دو بسته BGA برای بهبود پاسخ در ارتعاشات تصادفی
Authors [Persian]
میلاد شهسواری, مسعود عسگری
Abstract [Persian]
طیف وسیعی از قطعات در طول دوره عمر خود، در بیشتر مواقع تحت بارگذاری دینامیکی و کمتر تحت بارهای استاتیکی قرار می‌گیرند. مهمترین بارگذاری دینامیکی در دوره عمر قطعات، ارتعاشات تصادفی می‌باشد. برای ارزیابی چرخه عمر قطعات، معمولاً تحلیل خستگی انجام شده و مقاومت قطعات در محیط کاری، مورد ارزیابی قرار می‌گیرد. خارج از محدوده قرار گرفتن فرکانس طبیعی قطعات، نسبت به حوزه فرکانسی ارتعاش تصادفی، موجب شده تا از پدیده تشدید فاصله گرفته که این امر موجب بالا بردن عمر کاری آن می‌شود. در این تحقیق یک بورد مدار چاپی که دارای دو قطعه الکترونیکی BGA است، مورد مطالعه قرار گرفته و توسط روش‌های خاص بهینه سازی، مقدار فرکانس طبیعی آن بررسی و بهینه شده است. بهینه سازی با دو الگوریتم مختلف انجام شده و پاسخ های بدست آمده از هر الگوریتم، مقایسه و صحه-گذاری شده است. ضمناً برای بدست آوردن پاسخ در هر طیف ارتعاش، از نرم افزار آباکوس استفاده شده است.
Keywords [Persian]
بورد مدار چاپی، فرکانس طبیعی، ارتعاشات تصادفی، روش پاسخ سطح
References
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