Download Analysis of Box Girder and Truss Bridges by Guohao Li PDF

By Guohao Li

This ebook displays the sensible event the authors have won in studying the field girder and the truss utilized in bridge engineering; the instantly and curved field girder bridge, the truss bridge, and the arch-stiffened truss bridge are thought of, wherein bending and torsional stresses, lateral buckling and vibrations are investigated. The authors have confirmed a extra exact thin-walled beam conception of field girder, and, as an extension of the thin-walled beam concept, constructed a idea of bending and torsion of the truss bridge. Many functional examples were analyzed, and from those effects, conclusions beneficial to layout perform were deducted.

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6. Block diagram of system for simulating sound fields in concert halls with two-loudspeakers free signal. p! f ) ---------- X21f) , Anechoic chamber ---- --- --------- ----~ = Xl(w)HI1(w)+X2(W)Hdw) , Fr(w) = X 1(w)Hr1 (w)+X2(w)Hdw). 11) where D(w) = H I1 (w)Hdw)-Hr1 (w)Hdw). 13) where d(t) is the inverse Fourier transform of D( w) -1. The necessary and sufficient condition for a unique solution is D( w) ::j:: 0, for the full frequency range. 2 Simulation of Sound Localization 43 Fig. 7. Block diagram ofthe reproduction filter for two-channel loudspeaker systems (asymmetry): f/(I) and fr(l) are signals to be reproduced at both ears; XI (I) and X2(1) are signals to be supplied to two loudspeakers Fig.

Data from a continuous speech signal of Te = 12 ms are also plotted in the figure. Two reasons can be considered to explain why the preference decreases for 0< LI tl < Tp: r. 1) tone coloration effects occur because of the interference phenomenon in the coherent time region (Appendix C); and 2) the IACC increases, as shown in Fig. 5, for LI tl -+ O. 6], see Fig. 5a. 52 4. r;bd~ . - ;t'''' j Fig. 4. 2 Preferred Direction of a Single Reflection The delay time of the reflection, in an experiment to show the preferred direction of a single reflection, was fixed at 32 ms.

0 kHz), the transfer function of the external canal E(w) is independent of the directions in which sound is incident on the human head for the audiofrequency range. Therefore, interactions between the sound field in the external canal and that of the pinna are insignificant. The transfer function from the free field to the eardrum can be obtained by multiplying the following two functions: (1) the sound source in the free field to the ear-canal entrance - H(e, n, w) - and (2) from the ear-canal entrance to the eardrum - E(w).

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