How much can weather conditions influence the effectiveness of automatic monitoring of noise? And is it necessary to carry on synchronous meteorological monitoring for the noise automatic monitoring? In order to answer these questions, a deep analysis is required. Based on the monitoring data and related information, the correlation between sound level and wind speed is analyzed. The results indicate that wind speed should be measured simultaneously in noise automatic monitoring to ensure the reasonableness and accuracy of the data. The noise monitoring data must be modified or validated according to wind speed monitoring data.

A new method, which combines impedancemobility modeling method with matrix transmission modeling method, is presented for the study of activeflexible coupled isolation system. The mathematical model of flexible coupled isolation system is constructed, including isolated equipment, electromagnetic activepassive isolator, and flexible base. The linear quadratic Gaussian method (LQG) is applied to design the active controller of the isolation system. Simulation results show that this control method is effective.

Focusing on flexible coupled isolation system widely being in real engineering, a state space equation realization method is presented suitable for project control application. Aim at frequence characteristic of flexible coupled isolation system, least squares method, equation synthesis menthod and balanced truncation method are applied for obtaining state space equation in this paper. Obtained state space model provided a theoretical base for studying active control algorithm.