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《Sound Intensity Analysis of Shell Structures Subjected to Dynamic Loading》
ZENG Guo-ying;ZHAO Deng-feng
   2010, 30 (3): 60-63.   DOI: 10.3969/j.issn.1006-1355.2010.03.016
Abstract （1914）      PDF（pc） （229KB）（1835）       Save
Structural sound intensity vector diagrams present directly and visually the energy distribution and propagation of the points on shells surface. First of all, the formula for calculating structural sound intensity in local coordinate systems is deduced. By using coordinate transformation, the expression of the structural sound intensity in the global coordinate system is obtained. The sound intensity of a composite shell structure is calculated using FEM, and the sound intensity diagrams are obtained. The results show that the FEM used in this paper is very effective for analysis of the sound intensities of shell structures.
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《Analysis of Vibration Simulation of BoltsFlange Connection Structure》
GAO Xu;ZENG Guo-ying
   2010, 30 (3): 38-40.   DOI: 10.3969/j.issn.1006-1355.2010.03.011
Abstract （2188）      PDF（pc） （174KB）（1974）       Save
Using ANSYS code, a 1/8cycle symmetric 3D nonlinear finite element model of boltsflange connection structure is established. Nonlinear transient dynamic analysis is done for the model with three different tightening torques under sinusoidal excitation. Using ANSYS postprocessing, the acceleration signals and signal differences of the pairs of nodes on the top and at the bottom of the flange near the bolt are obtained. The simulation data is compared with experimental data and the relationship between the tightening torques and the signals is acquired. The comparison result ensures the reliability of the finite element model.
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