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Cholerny Spammer
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 Posted: Sun 6:49, 02 Jan 2011 Post subject: moncler jacken Acoustic cone structure and propert |
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Acoustic cone structure and properties of wedge
the shorter the transition part of the z reflection coefficient increases, resulting in reduced absorption coefficient. Vice versa. The longer the transition part of the reflection coefficient is reduced, leading to enhanced absorption properties. In addition. Certain cone wedge length. Different frequency sound waves in the reflection coefficient is different, the higher the frequency, the shorter the required length, and vice versa, the lower the frequency, the longer the required length. Under a certain length L, L and L, there is an optimal ratio is generally 0.7 to 0.9. The above rules, but also for the acoustic cone wedge structure provides the basis for the selection of parameters. V. Conclusion: 1, grew up in the park when crossing the horizontal line of the cone degree split before absorption layers with the gradient theory to study the cone of reflection coefficient of Wedge 2, the table value and Zmz zm and adult values proportional, and L0 is inversely proportional,[link widoczny dla zalogowanych], that is, select a low voice speed. And density similar to high-loss materials. Can improve the absorption effect. It should be noted that when the loss is too large, verify that also meets to consider w. K. B criterion condition,[link widoczny dla zalogowanych], see Appendix (1) 3, when the meet w. K. B criteria, and meet (pl / kp) \Can be in a wide frequency range, in the presence of conical bottom thickness (L-L) case, the use of mesh cone split the approximation R = e - ko (z-+ z,[link widoczny dla zalogowanych],) 'I. Calculation of the reflection coefficient. See Appendix . 4, can be seen from the approximate expression, acoustic cone wedge part of the transition was decisive for the absorption effect. Cone wedge length changes directly affect the reflection coefficient. And even the sound absorption coefficient. There Cone appropriate thickness [L-L). Can be absorbed in the transition part of the sound can not attenuate 5, the maximum sound absorption of the required length of cone wedge to determine the frequency the higher the frequency right foot, the shorter the required length of the cone wedge a certain length of sound waves of different frequencies The absorption coefficient is different. Or when the value of a given absorption coefficient. Sound waves of different frequencies should be used in different products store in 1994, split cone length. VI Conclusion: In this paper, a cone with the tip to solve the split of the reflection coefficient of acoustic parameters with the material,[link widoczny dla zalogowanych], structural parameters and operating frequency from the relationship. Acoustic parameters of the known material to complete the case. Easy to study the performance of the work of the sound absorbing structure. Further simplify the analysis and estimation to the cone wedge absorption effect purposes. As the level is limited. There is inevitably wrong,[link widoczny dla zalogowanych], and hope those who criticized the correction read. In this study, it has been the guidance of Comrade Zhang Jianguo help grateful! Reference grams offer still Erchang l (Acoustics '0 No. 4 (1985) 2, Sun Li Hua (underwater acoustic communications' 4 (1983) 3, where for Yong, ZHAO Yu-fang 'acoustic theory' against publishing Yu Mu (198J), the Rong Chong and other 'manual on acoustic, Science Press, 0983) of Appendix with King 1 . W.K.B Discussion on criteria for use W.K.B approximation, must meet the criteria l1 �� five dkf \order, according to the formula derived: a 12K �� f = hit koL �� 2I so u Au Ru Hua Hui tlB2udx1l [(+10 + Bl). + (A2 + ') 0) Simulium blow w (u) To facilitate the use of W. K. B criterion. Have w (u) compiled into a table (this is abbreviated) can be seen from the table, w. K. Criterion B in w (u) Look increases with q, with the CO decreases. This is a good sound absorption properties of the phase when the required speed with a low voice, but with high losses and vice versa. It can not alone improve the material performance and blindly consider raising at the expense must meet the prerequisite criteria in Appendix discussion (p, /) L_ \when the cone wedge. Need to be on the (p, / Kp) L1 to judge, only in (pr/K0) L \W. K. B cone under the condition of the reflection coefficient near wedge-type f only applies to xLI ~ uniform basis at the then part of the park bond wedge. Of (pr / ~ o) L judge, in fact, to judge their model. The model order obtained by the formula: f hit. Korea: Hyun 'Y To facilitate judging, the preparation of the Y into a table (this is abbreviated), can be seen from the table. Y value is the embroidery \Sound performance is good law and the end of the end of the sound when the violation of the requirements of medium density and water table near the line, but with high losses and vice versa. This also shows that q to increase with the increase of the absorption properties of sound absorption material is limited.
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