پديد آورنده :
دارابي، كاوه
عنوان :
پيش بيني نويز ضربه اي در طبقات مختلف ساختمان
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
هفت، 164ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
سعيد ضيايي راد
توصيفگر ها :
آكوستيك , آناليز هارمونيك , آناليز گذرا , روش المان محدود
تاريخ نمايه سازي :
27/10/90
استاد داور :
حميدرضا ميردامادي، محمدرضا فروزان
تاريخ ورود اطلاعات :
1396/10/12
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
165 Impact Noise Prediction on the Floors of Structures Kaveh Darabi darabi kaveh@gmail com July 23 2011 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiS Ziaie Rad szrad@cc iut ac irAbstractIn this thesis a prediction model based on Finite Element Method has been presented for impact noise indifferent floors of a building Expensive experiments will be gradually replaced by prediction models whichconsist of three parts excitation system and response Source of excitation is standard ISO tapping machine Inthis research different methods for calculating the applied forced by ISO tapping machine to a building floorhave been investigated and an appropriate one has been selected for calculating the applied force to the lightweight building floor In the selected method force is obtained using the mobility of excitation point Theobtained force in time domain can be transformed to the frequency domain by means of Fourier transform Inthis prediction model system consists of the building floor the air filling the rooms and rooms boundaries Themodel is simulated using structural and acoustical elements of ANSYS software In modeling the system it hasbeen tried to use material properties and geometrical dimensions of an actual test sample After defining thesystem and the excitation force the third part of a prediction model i e system response to the excitation sourceshould be determined The response in this research is the average acoustic pressure level in the test room afteran impact is applied on the building floor To obtain this response harmonic and transient analyses are used Frequency and time domain values of the force calculated from previous step are used as excitation source inharmonic and transient analysis respectively Because of the high computational cost in harmonic analysis anoptimized algorithm for analysis of the problem has been recommended For reaching the desired responsedifferent methods have been used for calculating the average acoustic pressure level of the room in each of theharmonic and transient analyses In the first method radiated power to the noise receiving room and in thesecond method time and spatial average of pressure in different points of the room are used to evaluate thedesired responses Results obtained by these methods have been compared For verifying the simulation itsresults should be compared with actual test results Results of a test carried out in a laboratory in Sweden havebeen used for this purpose Comparison of simulation and test results shows that in a big portion of thefrequency range there is a good agreement between these results and error is less than three percents Infrequency ranges where simulation and test results are different reasons of this disparity are discussed Theproblem was also solved by transient analysis and results were compared with harmonic analysis In a bigportion of the frequency range there was a reasonable accordance between results obtained by two methods Key wordsAcoustics Impact Noise Harmonic Analysis Transient Analysis Finite Element Method
استاد راهنما :
سعيد ضيايي راد
استاد داور :
حميدرضا ميردامادي، محمدرضا فروزان
