JCQ depurant-muffler is adopted on 49ZQ engine using small rare-earth element balls as catalyst and took the method of quadrature frequency band optimization to opetmize the configuration parameters.
用于492Q发动机的JCQ净化消声器采用稀土小球为催化剂，用正交频带加权优化法优选消声器结构参数，
得良好的消声、净化
能。
OFDM (Orthogonal Frequency Division Multiplexing) is a method that can combat multipaths, fully use the frequency band and has high data rate, and has a promising future in UWA communication.
摘要正交频
复用(OFDM)技术具有抗多径、频带利用充、传输数据率高的优点，在水声通信中具有重要的发展前景。
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