Modified parametric identification of structural nonlinearities from measured frequency response data

  • سال انتشار: 1393
  • محل انتشار: بیست و دومین کنفرانس سالانه بین المللی مهندسی مکانیک
  • کد COI اختصاصی: ISME22_702
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 1094
دانلود فایل این مقاله

نویسندگان

Seyed Ehsan Haji Agha Mohammad Zarbaf

PhD Student, Iranian Research Organization for Science and Technology

Mohammad Mahdi Malekian

Assistant Professor, Iranian Research Organization for Science and Technology

Hasan Jalali

Assistant Professor, Arak University of Technology

چکیده

Structural nonlinearity is a frequent occurrence in mechanical structures encounter dynamic loading. In several cases, such as the cases where the structure experiences low-amplitude vibration, nonlinear structures can be analyzed using linear theory without losing accuracy in the final results. However, there are cases where nonlinear effects cannot be neglected and using linear theory to analyze a nonlinear system results in significant error in final results and as a result, nonlinear effects and therefore nonlinear analysis become unavoidable. In such circumstances, it becomes necessary to detect, localize and parametrically identify nonlinear elements from measured vibration data. In this study, a recently proposed nonlinear identification method is modified. Although the mentioned method is capable of parametrically identifying nonlinearities from measured frequency response functions, the systems which can be investigated by the method are limited to some tight restrictions. In this paper, it is aimed to identify the limitations of the method and then, modify the method so that it can be applied to a wider range of nonlinear mechanical systems.

کلیدواژه ها

Nonlinear system identification, Modal analysis, Frequency response function

مقالات مرتبط جدید

اطلاعات بیشتر در مورد COI

COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.

کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.