Search

A higher order sliding mode control algorithm is proposed to design and analyze for a class of MIMO nonlinear systems with unknown nonlinearities. The proposed control scheme based on geometric homogeneity and sliding mode control provides a general approach to design controller for near space vehicle system. Simulation example results demonstrate the advantages of the strategy.

Networked Control System (NCS) has been drawn much attention in control field, and the performance of integrating control with network is particularly considered. The co-design of control and network performances of NCSs simultaneously possesses the theoretical and practical significance. In the paper, the main four NCS factors, i.e., network-induced delay, scheduling, sampling period, and packet loss rate, are investigated from the perspective of theoretical analysis and simulation. The simulations, based on the Truetime toolbox, show the effect of each factor on the NCS performance, which could provide a critical research basis for the further research in the co-design of NCS control and scheduling.

Based on the geographic information systems and database technology, this study set up a contaminated sites information and remediation management decision-making system using Beijing sites data, which include a web portal interface and three major modules: site management, risk assessment and remediation decision. People can inter the system to browse and inquiry the information concerned, zoom in and zoom out the map, statistics and analysis the data. This system provided tools for risk assessment, remediation decision and expert review. This system will provide technical support for government departments and technical institutions.