Abstract
This paper presents a study on a rattle noise by comparison between experimental results and numerical analysis results as to a vibro-acoustic model by FEM. It was difficult to examine the phenomena of rattle noise from experimental results for influence of background noise at low frequency regions. Simulating a rattle noise, the vibration model is constructed with a contact state by putting two pieces of strip-formed sheets made of the plastic on top of one another. As an input waveform, random vibration and sweep vibration are used, displacement excitation method is applied on a node which is pinned support. As a result, the influence of contact could be confirmed from the vibration and acoustic time history response analysis results by FEM with contact and without contact. Also, the effectiveness of the vibration and acoustic model with the influence of rattle noise is examined through calculations employing a FEM model with contact and without contact in the power spectral results of the analytical and the experimental results, it can be seen that the analytical acoustic results indicate the phenomena of rattle noise at low frequency regions.
