| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a design and planning system for allocating a desired characteristic frequency and length of echoes to a small product. <P>SOLUTION: A design and planning system allocates sound to a small product, and has: means for forming a recess with S mm of an outer diameter or inner diameter to the small product to be set within a range of 0.4S≤D≤0.7S when depth of the recess is considered as D mm, and thickness is considered as T mm; and means for setting values of D and T by using a relational expression of the number of primary mode vibrations f(Hz)=-αS+βT+K<SB POS="POST">0</SB>, length of echoes f(t)=γS+K<SB POS="POST">1</SB>(α, β, γ are coefficients to be determined by materials, the shapes, K<SB POS="POST">0</SB>, K<SB POS="POST">1</SB>are constants). <P>COPYRIGHT: (C)2012,JPO&INPIT |
