噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2013年
3期
90-92
,共3页
邱群麟%闵益峰%刘军%李博%朱廉洁%刘湃
邱群麟%閔益峰%劉軍%李博%硃廉潔%劉湃
구군린%민익봉%류군%리박%주렴길%류배
声学%驻波%GT-power%排气系统%尾管噪声
聲學%駐波%GT-power%排氣繫統%尾管譟聲
성학%주파%GT-power%배기계통%미관조성
acoustics%standing wave%GT-power%exhaust system%tail pipe noise
研究目的是从理论和模拟计算两方面研究驻波的形成机理和解决措施,其过程是应用GT-power软件建立某项目排气尾管噪声声学模型,分析其排气系统尾管噪音各阶次噪声声学特征,确定某一共同频率的波峰是由长尾管的驻波引起的,提出两种解决方案。方案一是改变排气尾管长度,避开激励频率,弱化驻波波峰的效果,降低波峰处的噪音;方案二是设计针对此共同频率的谐振腔,消除此频率的噪音,从根本上解决驻波产生的噪音;最后通过模型再次模拟分析验证,结果表明两种方案都有明显的效果,达到预期目的。
研究目的是從理論和模擬計算兩方麵研究駐波的形成機理和解決措施,其過程是應用GT-power軟件建立某項目排氣尾管譟聲聲學模型,分析其排氣繫統尾管譟音各階次譟聲聲學特徵,確定某一共同頻率的波峰是由長尾管的駐波引起的,提齣兩種解決方案。方案一是改變排氣尾管長度,避開激勵頻率,弱化駐波波峰的效果,降低波峰處的譟音;方案二是設計針對此共同頻率的諧振腔,消除此頻率的譟音,從根本上解決駐波產生的譟音;最後通過模型再次模擬分析驗證,結果錶明兩種方案都有明顯的效果,達到預期目的。
연구목적시종이론화모의계산량방면연구주파적형성궤리화해결조시,기과정시응용GT-power연건건립모항목배기미관조성성학모형,분석기배기계통미관조음각계차조성성학특정,학정모일공동빈솔적파봉시유장미관적주파인기적,제출량충해결방안。방안일시개변배기미관장도,피개격려빈솔,약화주파파봉적효과,강저파봉처적조음;방안이시설계침대차공동빈솔적해진강,소제차빈솔적조음,종근본상해결주파산생적조음;최후통과모형재차모의분석험증,결과표명량충방안도유명현적효과,체도예기목적。
The mechanism and elimination methodology of standing waves of exhaust systems were studied. The acoustic model for analyzing the noise of exhaust tailpipe was established with GT-power software. The acoustic characteristics of the exhaust tailpipe noise of different orders were obtained. It was found that the wave peak of a common frequency was caused by the standing wave of the long tailpipe of the system. Therefore, two schemes were proposed for solving the problem. One was to change the tailpipe length so that the natural frequencies of the tailpipe can avoid from the common frequency of the excitation source, the effect of the peak of the standing wave can be weakened, and the noise at the wave peak can be reduced. The other is to design a resonator to suppress this common frequency so that the noise of this frequency can be eliminated. Results of simulation show that both schemes have obvious effects for improvement of the acoustic performance of the exhaust system.