Aimed at the jet noise which is induced by the expand structure and tail tube in the resistant muffler, a finite element model at low Mach number was developed.
针对抗性消声器中扩张结构和尾管引起的射流噪声问题，建立了低马赫数射流噪声有限元分析模型。
2
The above method can expand variety of the parts manufactured by tube preform. Part quality also can be improved.
采用上述方法可显著扩大用管坯制造零件的品种，并可提高制品的质量。
3
In general a sealing technology involving welding in combination with expand jointing is used for connecting a pipe column to a tube plate in a tubulature type heat ex- changer.