摘要：The sta.istica. energy a.a.ysis (SEa. wa. used in the a.oustica. design of a. electrica. emergency pla.t to reduce the outdoor noise level. In the pa.t, when the pla.t wa. working, a.high a.noying noise wa. hea.d a.l over the university ca.p. a. a.first gla.ce the principa. wa.s of noise propa.a.ion were the open door of the pla.t which wa. used for the suction of fresh a.r a.d a.va.t hole in the ceiling which wa. used for ga.es outlet. a.so, a.spectra. a.a.ysis of the noise inside the pla.t showed tha. the domina.t frequencies of the noise were in the ra.ge of 120 - 270 Hz. This frequency ra.ge is nea. the critica. frequency of the brick wa.ls tha. is 129 Hz, a. which the wa.ls a.e tra.spa.ent for noise. a.two-block dia.ra. is used for the sta.istica. energy a.a.ysis. Two wa.s of sound tra.smission a.e considered through the inlet a.d outlet holes a.d through the wa.ls a.d ceiling. This a.a.ysis shows tha. the exclusion of holes wouldn’t be sufficient to reduce noise to a. a.cepta.le level in a.low frequency ra.ge but increa.e the noise a.sorption by the wa.l coa.ing ma.eria.. The tra.smission loss is ca.cula.ed for different wa.l coa.ings a.d hole a.ea.. a.la.er of fibergla.s of two-inch width is selected to increa.e the wa.l a.sorption coefficient. Specia. silencers a.e designed a.d put a. the suction of a.r a.d a. the outlet of engine ga.es to reduce the noise propa.a.ion through the holes. The noise mea.urement shows tha. the noise level is considera.ly reduced a.ter implementa.ion of these mea.ures. The reduction of noise is 7 - 8 dB (a., 19 dB (a. a.d 23 dB (a., inside the pla.t, 10 m a.d 15 m a.a. from the pla.t, respectively.