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《Numerical Simulation of Vibration and Sound Radiation of Tires》
CHAN LiangG;XIAO Wang-xin;XIE Wei-ping
   2010, 30 (3): 85-90.   DOI: 10.3969/j.issn.1006-1355.2010.03.023
Abstract （2263）      PDF（pc） （302KB）（1656）       Save
Numerical simulations of vibration and sound radiation of the 225/50R17 smoothing tire and longitudinally grooved tire excited by surface load are carried out by using the FEM software ANSYS and the BEM software SYSNOISE. The displacement frequency responses of the tires excited by, respectively, radial contact force, tangential contact force and lateral contact force are calculated using FEM. Then, the result of nodal displacement responses is used as the boundary condition for the BEM model. The radiation sound power, radiation efficiency, and the directivity of sound in far field in three working cases are computed by means of BEM technique.
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《Study on Comfortableness of a Gymnasium under the Condition of Floor Vibration》
XIE Wei-ping;HONG Wen-lin;LI Ting
   2010, 30 (2): 80-83.   DOI: 10.3969/j.issn.1006-1355.2010.02.080
Abstract （2448）      PDF（pc） （1336KB）（1827）       Save
With the development of largespan, lighter and more flexible modern structures, much attention has been paid to the issues of structure vibration and structural comfortableness in vibration environment caused by human activities. Yet there is hardly a unified standard available for evaluation of the structural comfortableness. The issue of the structural comfortableness of a gymnasium under the condition of floor vibration is discussed in the paper. The computation model of a finite large floor is established and its natural frequencies under different boundary conditions and loading conditions are calculated. The natural frequencies and vibration accelerations of the floor under the most unfavorable conditions are measured. The computation result of floors natural frequencies is in consistent with that of site measurement. Thus, the rationality of the numerical calculation model is verified. Based on the measured acceleration values, comfortableness in the floor vibration environment is evaluated by using the international standard ISO 26311997. The evaluation results show that the floor can satisfy the demand of comfort. The method for comfortableness evaluation used in this paper can provide a reference for other engineering structures.
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