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۱Structural Vibration Control using Shunted Magnetostrective Materials by Pulse switching Technique
نویسنده(ها): ،
اطلاعات انتشار: دومین کنفرانس بین المللی آکوستیک و ارتعاشات، سال
تعداد صفحات: ۸
Semi–passive vibration control devices using non–linear methods have experienced significant development in recent years, due to their performance and advantages compared with passive and active techniques. More precisely, SSD (Synchronised Switch Damping) or pulse switching technique, lead to a very good trade–off between simplicity, required power supply and performance. This technique which was developed at first in the field ofpiezoelectric damping consists in triggering the inverting switch on each extremum of the piezoelectric voltage which induces an increase of the electromechanical energy conversion.This paper for the first time tries to apply this method on the Magnetostrective material in order to control of structural vibration. Magnetostrective or piezoelectric materials in conjunction with appropriate electric networks can be used as a mechanical energydissipation device. Alternatively, undesired mechanical energy of a structure could be converted into electrical energy that can be dissipated through a shunt network in the form of Joule heating. A significant decrease in vibration energy is demonstrated theoretically in the case of a vibrated clamped beam<\div>

۲Effects of Working Situations on Hybrid Semi–Active\Passive Pulse–Switching Vibration Control Technique
نویسنده(ها): ، ،
اطلاعات انتشار: سومین کنفرانس بین المللی آکوستیک و ارتعاشات، سال
تعداد صفحات: ۸
The hybrid semi–active\passive damping technique as a combination of semi–active pulse–switching technique and PCLD (passive constrained layer damping) technique is a new effec–tive hybrid damping method for all frequency ranges. It compensates the drawbacks of semi–active (low damping in high frequency vibrations) and passive (low damping in low frequen–cy vibrations) methods and prepares significant damping in both low and high frequency ranges. Working temperature and excitation frequency are the environmental factors that af–fect on the viscoelastic damping behavior and consequently on the proposed hybrid method efficiency. In this paper study of the proposed technique under different excitation frequen–cies in a wide range of temperature variations, demonstrates significant damping, in spite of viscoelastic material characteristics dependence on environmental factors.<\div>
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