cut-and-try

By using the equivalence between the solution of boundary problem for differential equation and functional extreme value, cut-and-try methods are used for the finite element methods ( FEM), solution of unstable temperature-field inside grain-layer in the process of grain drying.

利用求解微分方程的边值问题和泛函求极值问题的等价性，进行了谷物干燥过程中谷物层内部非稳态温度场的有限元解尝试。

According to the non-backlash meshing basic relation ship and the requirement of equality of addendum reducing coefficients, the paper applies computational methods of computer programming and cut-and-try to determine the modification coefficient of idle gear in ordinary gear train.

本文依据无侧隙啮合基本关系和齿顶降低系数相等的要求，应用计算机编程计算和计算器试凑计算方法，确定定轴轮系惰轮的变位系数。

In light of traditional PID controller parameters optimization with manual cut-and-try method, a novel kind of PID parameters optimization strategy based on ACA ( Ant Colony Algorithm) was proposed.

针对传统的PID控制器参数多采用试验加试凑的方式由人工进行优化，提出了一种新型的基于蚁群算法的PID参数优化策略。