噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2013年
3期
34-38
,共5页
霍新祥%杨新文%张小安%李奇
霍新祥%楊新文%張小安%李奇
곽신상%양신문%장소안%리기
声学%隔声量%矩形薄板%全频段%有限元法
聲學%隔聲量%矩形薄闆%全頻段%有限元法
성학%격성량%구형박판%전빈단%유한원법
acoustics%transmission loss%rectangular plate%full frequency band%finite element method
建筑声学中质量作用定律等理论不满足于轻质薄板隔声量的计算,解析法只能粗略描绘隔声特性曲线,不能满足于实际工程需要。利用有限元软件ACTRAN建立薄板隔声量计算模型,得到不同材料属性、几何参数及边界条件下矩形薄板在全频段的隔声量,分析薄板的材料属性、几何参数及边界条件对隔声量的影响规律。研究结果表明:(1)与解析法结果对比,有限元法计算的隔声量曲线很好的符合解析法所体现的规律性并弥补了解析法的一些不足;(2)对于薄板,阻尼控制区与质量控制区没有明显界限,其模态共振的影响延伸到整个质量控制区;(3)薄板振动模态与隔声量曲线中“低谷”一一对应;(4)在薄板的高阶模态区,其最大振动位移在板面上朝某一方向移动,有波的趋势。
建築聲學中質量作用定律等理論不滿足于輕質薄闆隔聲量的計算,解析法隻能粗略描繪隔聲特性麯線,不能滿足于實際工程需要。利用有限元軟件ACTRAN建立薄闆隔聲量計算模型,得到不同材料屬性、幾何參數及邊界條件下矩形薄闆在全頻段的隔聲量,分析薄闆的材料屬性、幾何參數及邊界條件對隔聲量的影響規律。研究結果錶明:(1)與解析法結果對比,有限元法計算的隔聲量麯線很好的符閤解析法所體現的規律性併瀰補瞭解析法的一些不足;(2)對于薄闆,阻尼控製區與質量控製區沒有明顯界限,其模態共振的影響延伸到整箇質量控製區;(3)薄闆振動模態與隔聲量麯線中“低穀”一一對應;(4)在薄闆的高階模態區,其最大振動位移在闆麵上朝某一方嚮移動,有波的趨勢。
건축성학중질량작용정률등이론불만족우경질박판격성량적계산,해석법지능조략묘회격성특성곡선,불능만족우실제공정수요。이용유한원연건ACTRAN건립박판격성량계산모형,득도불동재료속성、궤하삼수급변계조건하구형박판재전빈단적격성량,분석박판적재료속성、궤하삼수급변계조건대격성량적영향규률。연구결과표명:(1)여해석법결과대비,유한원법계산적격성량곡선흔호적부합해석법소체현적규률성병미보료해석법적일사불족;(2)대우박판,조니공제구여질량공제구몰유명현계한,기모태공진적영향연신도정개질량공제구;(3)박판진동모태여격성량곡선중“저곡”일일대응;(4)재박판적고계모태구,기최대진동위이재판면상조모일방향이동,유파적추세。
Since the theory of mass action law in architectural acoustics can not meet the need of transmission loss (TL) calculation for light sheets, the analytical method can only roughly describe the characteristic of the TL and can not satisfy the requirement of actual engineering projects. In this paper, a model for computation of a sheet’s transmission loss was developed by means of the finite element software ACTRAN. The TL curves of a rectangular sheet in full frequency band were plotted for different material parameters, different geometrical parameters, and different boundary conditions. It was found that the TL curves obtained by FEM can match with the common laws obtained by analytical method well, and make up for some defects of the analytical method. The TL curves of a simply supported sheet show that there is no obvious interface between the damping control zone and the mass control zone, and the influence of the modal resonance on TL can be extended to the whole quality control zone. The valleys of the curves of the vibration modes and the TL correspond to each other. In the area of high order vibration modes, the positions of maximum displacement moves in a same direction of the sheet and the tendency of vibration wave can be found.