时间恒定的
The Waveform and Spectrum of Input and Output Random Processes of A Linear Time Invariant System. 输入与输出线性非时变系统之随机电压其波形及频谱。
The solvability conditions of the LQ inverse problem for the multivariable linear time invariant system is studied iwth the polynomial matrix method. 利用多项矩阵方法研究了多变量线性定常系统LQ逆问题的可解性条件，得到了一般情形下的LQ逆问题解的充要条件及其代数描述。
The robust fault detection filter（RFDF） design problem for linear time invariant（LTI） system with unknown inputs is studied. 摘要 针对包含未知输入的线性时不变系统，研究了其鲁棒故障检测滤波器设计问题。
A support hyperplane method is presented to find the response set defined for a linear time invariant vibration system under the excitations modeled by some convex sets. 对激励由凸集合建模的线性振动系统提出了响应集的概念，将数学上的微分包含问题简化为求解多自由度振动系统的响应集问题。
If reciprocity and symmetry exist for passive two port networks of linear time invariant under zero intial condition,the circuit parameters will have some important characters. 对于线性非时变的无源二端口网络，在零初始条件下，若存在互易性及对称性，则其电路参数具有一定的特殊性。
Aiming at the linear time invariant system，a characteristic value was proposed and the prediction error of RUL was analyzed under some assumptions for system structure and hidden fault. 针对线性时不变系统构造了预测特征量，并分析了在一定的系统结构假设和故障假设下的剩余有效寿命预测误差。
