超前项 meaning in English

advance item
leading phase
leading-in phase

For the nonlinear two - point boundary value problem with both time - delay terms and time - advanced terms driven by the optimal control theory , we build a sequence of nonhomogeneous linear two - point boundary value problems according to the successive approximation approach of constant differential equation
再利用常微分方程的逐次逼近法，将由系统的最优控制问题得到的即含有时滞项又含有超前项的非线性两点边值问题化为非齐次线性两点边值问题族。
For a nonlinear system with time - delay , the optimal control problem based on quadratic performance indexes is usually transformed to a nonlinear two - point boundary value problem with not only time - delay terms but also time - advance terms . therefore , this kind of optimal control problem is especially difficult to be solved , no matter exact solutions or numeral solutions
对于带时滞的非线性控制系统，其基于二次型性能指标的最优控制问题往往转化为一个既有时间滞后项又有时间超前项的非线性两点边值问题，因此解决这一类控制问题尤其困难，不论是求其精确解还是数值解。