噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2015年
1期
114-118
,共5页
欧阳联格%易步回%葛晓宏
歐暘聯格%易步迴%葛曉宏
구양련격%역보회%갈효굉
声学%边界元法%面板贡献量%履带式沙滩清洁车
聲學%邊界元法%麵闆貢獻量%履帶式沙灘清潔車
성학%변계원법%면판공헌량%리대식사탄청길차
acoustics%boundary element method%panel contribution%crawler beach cleaner
利用履带式沙滩清洁车驾驶室有限元模型进行了自由模态计算,将结果与试验模态对比;确认建模的精确性,用LMS Virtual. Lab软件进行模态叠加;然后得到驾驶室的频率响应。再将结构振动速度作为边界条件进行驾驶室室内声场仿真计算,获得了2 Hz~200 Hz频率激励下的驾驶员左右耳处的声压值。通过板件贡献量分析找出对场点声压峰值贡献较大的板件,最后依据国标对驾驶室室内声场特性作出评价;表明该驾驶室具有良好的动态声学设计。
利用履帶式沙灘清潔車駕駛室有限元模型進行瞭自由模態計算,將結果與試驗模態對比;確認建模的精確性,用LMS Virtual. Lab軟件進行模態疊加;然後得到駕駛室的頻率響應。再將結構振動速度作為邊界條件進行駕駛室室內聲場倣真計算,穫得瞭2 Hz~200 Hz頻率激勵下的駕駛員左右耳處的聲壓值。通過闆件貢獻量分析找齣對場點聲壓峰值貢獻較大的闆件,最後依據國標對駕駛室室內聲場特性作齣評價;錶明該駕駛室具有良好的動態聲學設計。
이용리대식사탄청길차가사실유한원모형진행료자유모태계산,장결과여시험모태대비;학인건모적정학성,용LMS Virtual. Lab연건진행모태첩가;연후득도가사실적빈솔향응。재장결구진동속도작위변계조건진행가사실실내성장방진계산,획득료2 Hz~200 Hz빈솔격려하적가사원좌우이처적성압치。통과판건공헌량분석조출대장점성압봉치공헌교대적판건,최후의거국표대가사실실내성장특성작출평개;표명해가사실구유량호적동태성학설계。
The finite element model for a Crawler Beach Cleaner’s cab was established and a free modal analysis was made by means of OPTISTRUCT code. Mutual comparison of calculated modals and tested modals proved the accuracy of the finite element model. The modal superposition was done by means of LMS Virtual.Lab software and the frequency re-sponse of the cab was obtained. Then, the velocity of structure vibration was used as a boundary condition for cab interior acoustic simulation, and the sound pressure levels at the driver’s ears were obtained in the frequency range from 2 Hz to 200 Hz. Panel acoustic contribution analysis was applied to find the cab panels which make great contribution to the interior noise. Finally, according to the national standards, the acoustic field characteristic inside the cab was evaluated. The results show that the dynamic acoustic design of the cab is good. This work has provided a reference method for noise reduction de-sign of engineering vehicles.