پديد آورنده :
لقماني، علي
عنوان :
كنترل فعال آكوستيك سازه اي پوسته استوانه اي با استفاده از وصله هاي پيزوالكتريك
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مكانيك
صفحه شمار :
بيست و دو، 149ص.: مصور
استاد راهنما :
محمد دانش، مهدي كشميري
توصيفگر ها :
ارتعاشات , نويز
استاد داور :
سعيد بهبهاني، حميدرضا ميردامادي، محمد محجوب، روح الله طالبي توتي
تاريخ ورود اطلاعات :
1395/07/05
كد ايرانداك :
ID907 دكتري
چكيده فارسي :
بيست و د چكيده روشها غيرفعال كارايي خود را در حذف نويزها فركانس پـايين از دسـت ـ ـ ميدهند لذا روشها فعال برا كاهش يا حذف چنـين نويزهـايي پيشـنهاد ـ ـ ـ ميشود برا حذف نويز در بازه وسيعي از فركانس لازم است كه روشهـا ـ فعال در كنار روشها غيرفعال به كار برده شود در اين رسـاله كنتـرل ـ ـ فعال ارتعاشات و نويز انتشـار از پوسـته اسـتوانها توسـط وصـلهها ـ ـ ـ ـ ـ پيزوالكتريك به صورت تئور و تجربي مورد مطالعـه قـرار گرفتـه اسـت ـ ـ ـ ـ
چكيده انگليسي :
Active Structural Acoustic Control of a Cylindrical Shell using Piezoelectric Patches Ali Loghmani a loghmani@me iut ac ir Date of Submission 2016 05 23 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree P hD Language Farsi1st Supervisor Mohammad Danesh51 Danesh@cc iut ac ir2nd Supervisor Mehdi Keshmiri52 Mehdik@cc iut ac irAbstract This dissertation investigates the active structural acoustic control ASAC of sound radiated from asmart cylindrical shell The cylinder was equipped with piezoelectric sensors and actuators to estimate andcontrol the sound pressure that radiates from the smart shell Two approaches were studied in this thesis toattenuate the radiated sound The fist approach is based on using virtual microphone and the secondapproach utilized the radiation modes of the cylinder The estimated pressure is referred to as a virtualmicrophone and it can be used in control systems instead of actual microphones to attenuate noise due tostructural vibrations To this end the dynamic model for the smart cylinder was derived using the extendedHamilton s principle the Sanders shell theory and the assumed mode method The simplified Kirchhoff Helmholtz integral estimates the far field sound pressure radiating from the baffled cylindrical shell Amodified higher harmonic controller MHHC that can cope with a harmonic disturbance was designed andexperimentally evaluated The experimental tests were carried out on a baffled cylindrical aluminum shellin an anechoic chamber The frequency response for the theoretical virtual microphone and theexperimental actual microphone are in good agreement with each other and the results show theeffectiveness of the designed virtual microphone and controller in attenuating the radiated sound Radiationmodes and radiation efficiencies were obtained for the cylindrical shell The first radiation mode is theefficient mode in radiating sound to the surrounding environment in low frequency domain therefore byomitting this mode most of the radiated sound can be attenuated This approach was modeled andsimulated and its results were compared with those of the conventional active vibration control Keywords Active structural acoustic control Cylindrical shell piezoelectric Virtual microphone Radiation mode Radiation efficiency Modified higher harmonic control LQG51 Department of Mechanical Engineering Isfahan University of Technology52 Department of Mechanical Engineering Isfahan University of Technology
استاد راهنما :
محمد دانش، مهدي كشميري
استاد داور :
سعيد بهبهاني، حميدرضا ميردامادي، محمد محجوب، روح الله طالبي توتي
