Rational Analysis of Aircraft Noise's Main Evaluation Measure in the Vicinity of Airports

The paper expatitates advantages and disadvantages of nowadays aircraft noise's main evaluation measure briefly.Through comparing and analyzing counting weight equivalent continuous perceived noise level L_(WECPN) and day-night equivalent sound level L_(DN) and the mutual internal relationship between them,the dispersion value computing formulae is deduced and according to the two evaluation measures' different criterion value,it's concluded that the result of evaluation from FAA's L_(DN) is lower 8 dB than China's L_(WECPN) at least at present.However this will not indicate that the measures of evaluation is good or bad,in fact what decides evaluation result of aircraft noise's ration is evaluation criterion value.At last,the paper made some more rational suggestions for evaluate the impact of aircraft noises.