Abstract
The quietness of mechanical products is an important product value. In the future, it is considered that the target frequency band will be higher and wider. The vibration problem in the high frequency range is affected by multiple natural frequencies. It is difficult to take measures only by paying attention to single peak. Therefore, a design method effective for broadband vibration problems is necessary. We propose a two-step design as a design method effective for broadband vibration problem. This paper is shown application examples of two-step design using both wave motion and mode viewpoint. For the first step of the research, the concept of two step design, perspective and detailed design is proposed in this paper. Perspective design means based on wave theory and it grasps global tendency of the structure with Analytical Statistical Energy Analysis. On the other hand, detailed design more focus on modal shape to reduce vibration at specific frequencies with Finite Element Method. To demonstrate the feasibility of proposed method, vibration energy propagation analysis of coupled suspension cross member is performed through numerical simulation. As a result, the two-step design shows that the vibration of the object can be further reduced in addition to the broadband vibration.
