Abstract
Complex structure assembled by many components need to reduce vibration and noise caused by the vibration considering not one part but all part of components. This paper pays attention to structural modification for the noise and the vibration reduction based on transmitted force between components under operating condition. First, frequency response functions of main component, which includes vibration source, and sub-components, which do not include vibration source are measured by modal analysis. Each component is connected at a few points and some sub-components are assumed to cause problem of the noise and the vibration. Second, a location where the transmitted force from the main component to the sub-component decreases is investigated by using mass struc-tural modification, furthermore it is confirmed that this method can reduce not only the vibration but also the noise caused by the vibration.
