A Complete description of intensity fields of thin isotropic plates for flexural waves in general field conditions
journal contributionposted on 06.12.2017, 00:00 by Nirmal MandalNirmal Mandal
In engineering practice, structural intensity gives valuable information of sources and sinks of vibration excitations as well as a detailed knowledge of energy propagation through structures. As a result, proper damping treatment can be employed to mitigate noise and vibration harness (NVH) problems. In this paper, a complete description of general vibration intensity fields (W/m) in the frequency domain for isotropic plates is formulated considering flexural waves which is not based on some approximation such as far-field conditions. An 8-point transducer array is required to get an intensity vector in a particular direction taking into account as many as fifteen cross-spectra of field signals. A multi-channel FFT analyser is useful for this measurement. However, one transducer frequency response method is also employed to estimate these cross-spectra alternately. It gives the measurements free from phase mismatch errors.