The present paper illastrates the random vibration of nonlinear systems with their stiffness and damping nonlinearity,and obtains the response moments of single degree -of-freedom to a random exitation by perturbation methods.

Research on groundwater management model and its application based on unit pulse saline intrusion response matrix;

In view of demands of the optimum design on deep excavation(pit) dewatering under complicated hydrogeological condition,the pulse and response relation and principle between the state variable,and controlled variable in groundwater system as well as how to construct groundwater table response matrix are introduced.

A method that fit the measured response matrix to the model response matrix is developed to calibrate the linear optics.

A new strategy of fast transient torque response is proposed in this paper,which improves the torque response in dynamic processes.