研究了用于声场分析的直接边界元法。
The direct boundary element method used in sound field analysis is studied.
在用直接边界元法解决弹性问题时，当场点与加载点重合时，边界积分方程将出现奇异。
When the direct boundary element method (DBEM) is used to solve an elastic problem and the field point coincides with the load point, the boundary integral will be strange.
本文采用直接边界元法，研究了土的弹塑性、粘塑性（含蠕变）及温度应力等非弹性状的边界积分方程求解摸式。
With direct B. E. M. the boundary integral equations of soil for elastoplasticity, viscoplasticity cluding creep and temperature stress are researched and soluted.
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