市政工程施工合同订立的管理

本文从法律的角度，结合市政工程的特点及实例，对合同订立阶段的管理作了一些浅略的分析，提出严格依法订立合同，是切实有效保障市政工程施工合同全面履行的先决条件。     

New algorithm for robust H2/H∞ filtering with error variance assignment

We consider the robust H2/H∞ filtering problem for linear perturbed systems with steady-state error variance assignment. The generalized inverse technique of matrix is introduced, and a new algorithm is developed. After two Riccati equations are solved, the filter can be obtained directly, and the following three performance requirements are simultaneously satisfied: The filtering process is asymptotically stable; the steady-state variance of the estimation error of each state is not more than the individual prespecified upper bound; the transfer function from exogenous noise inputs to error state outputs meets the prespecified H∞ norm upper bound constraint. A numerical example is provided to demonstrate the flexibility of the proposed design approach.     

磁悬浮列车的PID控制器设计

利用间隙传感器和加速度计作为敏感元件,对磁悬浮系统设计了带有加速度反馈的PID控制器,研究了H∞状态滤波器的设计,仿真结果表明,该控制系统具有较好的动态和稳态性能.