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    • 4. 发明授权
    • Perforated acoustical attenuators
    • 穿孔声衰减器
    • US5504281A
    • 1996-04-02
    • US184646
    • 1994-01-21
    • Leland R. WhitneyThomas J. ScanlanCharles A. MarttilaJoseph G. Mandell
    • Leland R. WhitneyThomas J. ScanlanCharles A. MarttilaJoseph G. Mandell
    • A47L9/00F01N1/24G10K11/172H04R1/02E04B1/82
    • H04R1/02
    • The invention provides an acoustical attenuator comprising:a porous material comprised of particles sintered and/or bonded together at their points of contact, having at least a portion of pores continuously connected, wherein said porous material has an interstitial porosity of about 20 to about 60 percent, an average pore diameter of about 5 to about 280 micrometers, a tortuosity of about 1.25 to about 2.5, a density of about 5 to about 60 pounds per cubic foot, a modulus of about 12,000 pounds per square inch or above, wherein said porous material has at least one through hole and wherein said interstitial porosity, average pore diameter, density and modulus values are for the porous material in the absence of any through holes, wherein the average diameter of the through hole is greater than the average pore diameter.
    • 本发明提供了一种声衰减器,其包括:多孔材料,由在其接触点处烧结和/或结合在一起的颗粒组成,其中至少一部分孔连续连接,其中所述多孔材料具有约20至约60的间隙孔隙率 约5至约280微米的平均孔径,约1.25至约2.5的弯曲度,约5至约60磅/立方英尺的密度,约12,000磅/平方英寸或更高的模量,其中所述 多孔材料具有至少一个通孔,并且其中所述间隙孔隙率,平均孔径,密度和模量值是在不存在任何通孔的情况下用于多孔材料,其中通孔的平均直径大于平均孔径 。