کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
565571 875783 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of damping on the nonlinear modal characteristics of a piecewice-smooth system through harmonic forced response
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
پیش نمایش صفحه اول مقاله
Effect of damping on the nonlinear modal characteristics of a piecewice-smooth system through harmonic forced response
چکیده انگلیسی

Several engineering systems present piecewise-linear characteristics, among them, the damaged beams with breathing cracks are of particular interest. The dynamics of such systems exhibits bifurcations at internal resonances characterized by the onset of superabundant nonlinear normal modes with their individual modal shapes. In this paper, a 2-DOF system with piecewise linear stiffness, representative of a damaged system with a breathing crack, is analyzed by means of a numerical and theoretical investigation. The oscillator is forced by a harmonic base excitation and the role of damping on the modification of the nonlinear modal characteristics is investigated. The outcomes are compared with the reference behavior of the undamped system which allows for semi-analytical solution. It is found that the damping, on one hand, softens the abrupt transitions from one behavior to another, typical of undamped systems, on the other, affects the bifurcations of the nonlinear modes causing some of them to completely disappear and leaving others largely unaffected.


► Damping affects the nonlinear characteristics of the forced response in different ways.
► Small damping causes some bifurcations to completely disappear and leaves others unaffected.
► Some operating modal shapes disappear only as a critical value of damping is reached.
► The harmonic forced response does not reflect all the nonlinear characteristics of the system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 36, Issue 2, April 2013, Pages 540–548
نویسندگان
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