噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2015年
2期
222-225
,共4页
声学%空滤器%进气压力%优化%辐射噪声%有限元法
聲學%空濾器%進氣壓力%優化%輻射譟聲%有限元法
성학%공려기%진기압력%우화%복사조성%유한원법
acoustics%air cleaner%intake pressure%optimization%radiation noise%finite element method
针对试验中发现的空滤器壳体辐射噪声大问题，综合运用模态计算、进气压力频谱计算、拓扑优化、形貌优化和声学有限元法解决了该问题。首先，通过模态计算，得出了空滤器外壳的各阶振型和模态频率。接着分析了发动机的进气压力波频谱，找出了进气压力较大的频段，由此可知空滤器辐射噪声大是由于第1阶频率较低引起的。然后，通过拓扑优化和形貌优化，找出了筋的最佳布置位置，使空滤器外壳的第1阶频率得到大幅提高。最后，通过辐射噪声的计算，确认了改进后的空滤器外壳的总声功率级降低了13.8 dB，噪声改进效果非常明显。
針對試驗中髮現的空濾器殼體輻射譟聲大問題，綜閤運用模態計算、進氣壓力頻譜計算、拓撲優化、形貌優化和聲學有限元法解決瞭該問題。首先，通過模態計算，得齣瞭空濾器外殼的各階振型和模態頻率。接著分析瞭髮動機的進氣壓力波頻譜，找齣瞭進氣壓力較大的頻段，由此可知空濾器輻射譟聲大是由于第1階頻率較低引起的。然後，通過拓撲優化和形貌優化，找齣瞭觔的最佳佈置位置，使空濾器外殼的第1階頻率得到大幅提高。最後，通過輻射譟聲的計算，確認瞭改進後的空濾器外殼的總聲功率級降低瞭13.8 dB，譟聲改進效果非常明顯。
침대시험중발현적공려기각체복사조성대문제，종합운용모태계산、진기압력빈보계산、탁복우화、형모우화화성학유한원법해결료해문제。수선，통과모태계산，득출료공려기외각적각계진형화모태빈솔。접착분석료발동궤적진기압력파빈보，조출료진기압력교대적빈단，유차가지공려기복사조성대시유우제1계빈솔교저인기적。연후，통과탁복우화화형모우화，조출료근적최가포치위치，사공려기외각적제1계빈솔득도대폭제고。최후，통과복사조성적계산，학인료개진후적공려기외각적총성공솔급강저료13.8 dB，조성개진효과비상명현。
Modal calculation, frequency spectrum calculation of intake pressure, topology analysis, topography analy-sis and acoustic FEM were employed to solve the serious radiation noise problem of an air cleaner’s shell. Firstly, vibration modes and eigen-frequencies of the air cleaner shell were obtained by modal computation. Secondly, the intake pressure spectrum was analyzed and the frequency zone with large intake pressure was determined. It was found that the large radia-tion noise of the air cleaner was resulted from the low 1st order frequency. Finally, the optimal position of the ribs was dis-covered by topology and topography analysis, so that the 1st order frequency of the air cleaner could be enhanced greatly. The result of the radiation noise computation show that the total sound power level of the air cleaner can be reduced by 13.8 dB after the modification and the improvement effect is very obvious.
