The technology of controlling noise in the outlet-designing and applying the silencing tower is mainly introduced.

The ventilation and sound attenuation system are introduced to the standard building acoustic sound insulation lab to meet the requirement of sound power level measure of chair outlet′s airflow noise for China National Grand Theater.

The noise reduction mechanism of porous asphalt pavement is analyzed from the mechanisms of porous sound absorption, as well as resonance sound attenuation and noise reduction.

Research on the influence of complex on the noise elimination;

A new eguipment of noise elimination aeration and dust contrel;

The principle & the measurements of noise elimination &vibration isolation of the air condition mechanical room;

Through researching the quality of noise abatement, resistance and uniform compression, etc, it indicates that static pressure tank's noise abatement characteristic relates with noise frequency, ratio of dilation and length of itself.

Then the directions of research & development are pointed out while the gas noise reduction technologys in commom use are summarized.

Presents the design methods of air conditioning water system, air distribution of rendition hall,air exhaust system, noise reduction, vibration isolation and automatic control.

Through practical analysis and noise measurement on civilian building, analysis on the reason of noise occurred, three air conditioning regions are divided: air conditioner room,the front and terminal of air supply system, based on noise reduction manner.