lecture0－CH1-Introduction.ppt

* * * * * * * * * * Mechanical Vibration Theory Professor Chen Qian 陈 前 教授 College of Aerospace Engineering NUAA Lecture Arrangement: Introduction S-DOF systems (4 Lectures)practical requirements from engineering practice, fundamentals of SDOF systems 2DOF Systems (6 Lectures) undamped and damped systems under free and forced (harmonic) excitation; superposition of vibration, transfer function, frequency response function, vibration measurement and applications Multi-DOF Systems (10 Lectures) EOM, damping, modal theory, response evaluation Continuous Systems (18 Lectures)transverse vibration of a string, lateral vibration of beams, Rayleigh and Rayleigh-Ritz methods. Random Vibration (10 Lectures) random processes, probability distribution, power spectral density, response of a SDOF system Viscoelastic Damping (2 Lecture)viscoelastic materials, frequency dependent complex modulus, standard model, damping treatments, EVC structure dynamicsNon-linear Vibrations (2 Lectures)Geometrical/physical nonlinearity, phase plane, Analysis methods Engineering Applications (5 lectures)fluid-flow induced vibration, vehicle vibration, vibration isolation, vibration in rotating machines and gearboxesExamination: 2 hours, 4 to 6 problems to solve Main Text Books W. T. Thomson-“Theory of Vibration with Applications”, 4th edition, London,1993. S. S. Rao-“Mechanical Vibration”, 3rd edition, Addison-Wesley Publishing Company, 1995. Communication means: /accounts/ManageAccount Email: MechVibTheory@G , Password: Note: Please don’t do anything to this mailbox! Just login and download whatever you are interested in. Should you have any questions for me, please mail to Q.Chen@, I’ll respond as soon as possible. INTRODUCTION Tacoma Narrows Bridge Disaster On November 7, 1940, at approximately 11:00 AM, the first Tacoma Narrows suspension bridge collapsed due to wind-induced vibrations. Situated on the Tacoma Narrows in Puget Sound, near the city of Ta