Aiming at efficient recognition of large-scale closed space graph,an overall scheme of recognition based on turning is given,considering the various stages related to recognition.

In order to solve the problem of calculating area of closed picture of many lines that can t be simply done by cutting apart picture,and get area of closed picture rapidly and accurately,a method that can automatic calculating area of closed picture with computer is provided.

In this paper,a theoretical study on active control of within enclosed space surrounded by flexiblestructure is accomplished.

Based on the basic theory of ANC within the enclosed space,this paper models the enclosed space with the COMSOL software,and presents the simulation and analysis effects of noise reduction which is derived from the numbers and location of the secondary noise resources.

The result of the numerical simulation of heat dissipation in a closed cavity is compared with the experiment result.

By applying the basic principle of thermodynamics, the expression of characteristic index B to the humidity control in a closed space is derived and is analysed and explained from the angle of two phase equilibrium.

Optimal strategy for the second source in enclosure under active noise control

Active control of structural acoustic radiation into an enclosure based on radiation modes