从函数逼近的角度建立三维无网格法中权函数影响半径的优化计算模型,针对一次基、二次基情形求解该模型.分析不同影响半径下函数的逼近误差,以及计算量、条件数等因素对无网格法计算性能的影响,结合数值试验,确认给出的权函数影响半径是有效、可靠、综合最优的。
We establish a practical mathematical model to compute optimal influence radius of weight functions in three dimensions. It is solved with linear basis and quadratic basis. Effects of error estimates, computing time and condition numbers of weight function with different influence radius on computation performance are investigated. Numerical examples demonstrate relability, efficiency and optimality of the influence radius.