Control of Noise and Structural Vibration: A MATLAB®-Based by Qibo Mao

By Qibo Mao

Control of Noise and Structural Vibration provides a MATLAB®-based method of fixing the issues of bad noise new release and transmission through buildings and of bad vibration inside constructions based on environmental or operational forces. the basics of acoustics, vibration and coupling among vibrating buildings and the sound fields they generate are brought together with a dialogue of the finite aspect strategy for vibration research. Following this, the therapy of sound and vibration regulate starts, illustrated through instance platforms akin to beams, plates and double partitions. Sensor and actuator placement is defined as is the belief of modal sensor–actuators. The layout of applicable suggestions structures contains attention of easy balance standards and powerful lively structural acoustic regulate. optimistic place suggestions (PPF) and multimode keep an eye on also are defined within the context of loudspeaker–duct and loudspeaker–microphone versions. The layout of varied parts is targeted together with the analog circuit for PPF, adaptive (semi-active) Helmholtz resonators and shunt piezoelectric circuits for noise and vibration suppression. The textual content makes vast use of MATLAB® examples and those could be simulated utilizing documents on hand for obtain from the book’s web site at End-of-chapter workouts may help readers to assimilate the cloth as they growth throughout the ebook. regulate of Noise and Structural Vibration may be of substantial curiosity to the coed of vibration and noise keep watch over and in addition to educational researchers operating within the box. It’s educational positive factors may also help practitioners who desire to replace their wisdom with self-study.

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Example text

Cos . Â/ sin . ///dS S Compare Eq. 75) and Eq. 76). R; Â; / D j! o exp . Â/ cos . Â/ sin . 77) shows the fundamental relationship between far-field radiated pressure and structural wave-number information: the far-field acoustic energy radiated in the direction defined by  and is determined solely by the single structural wave-number component evaluated at wave-number (kx , ky ) defined in Eqs. 79). 80) defines the supersonic region of the wave-number domain; this region is associated with the radiating components of the structural vibration.

J Acoust Soc Am 96(4):2302–2312 17. Naghshineh K, Koopmann GH (1994) An active control strategy for achieving weak radiator structures. ASME Trans J Vib Acoust 116:31–37 18. Naghshineh K, Koopmann GH (1993) Active control of sound power using acoustic basis functions as surface velocity filters. J Acoust Soc Am 93(5):2740–2752 19. Naghshineh K, Koopmann GH (1992) A design method for achieving weak radiator structures using active vibration control. J Acoust Soc Am 92(2):856–871 20. Johnson ME, Elliott SJ (1995) Active control of sound radiation using volume velocity cancellation.

It integrates computation, visualization, and programming in an easy-to-use environment where problems and solutions are expressed in familiar mathematical notation. Use the MATLAB Editor to write program in the MATLAB language and save them for future use. The editor saves your files with the m extension, which is where the name of M-file originates. There are two kinds of M-files: scripts, which do not accept input arguments or return output arguments and operate on data in the workspace, and functions, which can accept input arguments and return output arguments.

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