数值微分 meaning in English

numerical differentiation

The numerical differentiation of first and second order with tikhonov regularization
正则化方法求一阶和两阶的数值微分
In the text , differential coefficient method and numerical value differential coefficient method have been introduced for crank slide block machine accuracy analysis , and influence of the fitting clearance of moving pair to component moving error has been given
文章介绍了微分法及数值微分法曲柄滑块机构精度分析，说明了运动副的配合间隙对构件运动误差的影响。
The accuracy of reliability calculation was improved in the derivative sfem method . the local derivatives of fem and numerical method were used to obtain the iterative formulas of the performance function ' s local derivatives . the procedure is relatively simple and adaptable to engineering application as the stiffness matrix formed and decomposed only once
偏导sfem可靠度法求解构件疲劳可靠度，可靠度计算精度得到改善，通过有限元求偏导，结合数值微分技术，推导出了功能函数的偏导迭代格式，只需一次形成和分解总纲，计算较简便，适合工程应用。