acoustic field distribution modes的用法和样例：
- Based on the acoustic radi-ation modes and the acoustic field distribution modes, the formula for determining the acoustic power radiated from any vibrating surface is derived. The modal analysis in the acoustic radiation problems is enriched.
- The paper focuses on the immersion line-focusing ultrasonic transducer with cylinder curved acoustic lens used in intelligent pig,establishes a mathematical model of acoustic fields,calculates its acoustic field distribution and focal length.
- Owing to the differences of structural material's properties, the effects and distribution of acoustic field in buildings generated by traffic and neighbor noise are different.
- All guided modes in this PCF are nondegenerate.The field distribution of guided modes reflects the structural symmetry of the waveguide.