Abstract
Demand of design low noise and vibration products become higher in recent years. It is however difficult to manage vibration thorough broad band frequency and in the early stage for developing new products. To reduce noise and vibration levels we have two choices; one is controlling natural frequency characteristics which is referred to “mode” and the other is controlling base line of frequency response which is described by “wave”. Then it is important to have these two viewpoints to control the noise and vibration. This paper proposes a two-step design for designing low-vibration structures based on both views of vibration. In first step base line (average) behavior of structures is considered by using the view of wave and the design based on modal behavior is used in second step. Also, noise and vibration analysis methods for employing in each step design is discussed. Moreover, it is demonstrated that the proposed two step design is useful to design low-vibration structure through broadband frequency by using vibration energy propagation analysis such as Statistical Energy Analysis and Structural Intensity Method (SEA and SI), in which analytical SEA for the first step design and SI for the second step design.
