Research Article

Development of Adaptive Acoustic Impedance Control Technologies of Acoustic Duct Liner

Figure 12

Effect of mobile reflective plate shift mode on fan noise spectra reduction by adaptive duct liner II of AAC technology I model. Fan speed 4000 rpm; measuring point 60 deg.; mobile reflective plate parallel shift and backward shift, acoustic absorbent material stuck on reflective plate; poal + acousticel.
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