CN113858726B - 一种内嵌散射体及空腔的指数梯度声学覆盖层 - Google Patents
一种内嵌散射体及空腔的指数梯度声学覆盖层 Download PDFInfo
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Abstract
本发明公开了一种内嵌散射体及空腔的指数梯度声学覆盖层,包括匹配层(1)、吸声层(2)和钢背衬(3)。匹配层由玻璃钢制成,吸声层由多个矩形单元阵列排列而成,每个单元以密度为1000kg/m3的硅橡胶为基体,内部嵌入两层钢圆柱散射体和两层圆柱空腔,内嵌的钢圆柱散射体和圆柱空腔沿单元中线位置垂直排列,每层散射体或空腔具有不同的等效密度,整体呈指数形式梯度分布,吸声两侧做封口处理。钢背衬用来模拟水下航行器壳体。吸声层单元之间涂抹粘接剂经冷压粘接在一起,匹配层、吸声层和钢背衬三者之间同样涂抹粘接剂经冷压组合成一体。本发明中的梯度设计,能够有效拓宽低频吸声带宽,解决了声学覆盖层低频吸声频带窄的问题。
Description
技术领域
本发明涉及减振吸声技术领域,具体涉及一种内嵌散射体及空腔的指数梯度声学覆盖层。
背景技术
随着水下探测技术的发展,对潜艇等水下航行器的声隐身性能要求越来越高。在低中速航行下,机械噪声是最主要的噪声源,机械设备引起的声辐射主要处于低频范围。高速航行工况中,螺旋桨噪声和水动力噪声成为主要噪声源,而高频信号随着传播距离增加,衰减十分迅速,不易被声呐设备远距离探测。加之声呐工作频率逐渐向低频发展,因此控制低频辐射噪声是提高水下航行器声隐身性能的首要环节。“二战”中德国人将被称为阿尔贝里奇(Alberich)的吸声覆盖层应用到潜艇上,其具有优良的声隐身性能,大大提高了海中对抗作战能力。这种最早的吸声覆盖层,是一种背部附有圆柱空腔的橡胶类吸声材料。许多国家在阿尔贝里奇的基础上,对吸声覆盖层展开了研究。
目前国内外提出了多种复杂形状声腔结构的吸声覆盖层,如圆台型、指数型、倒锥型等空腔,利用空腔谐振的原理达到吸声效果,但普遍存在低频吸声频带窄的缺点。文献“Sound absorption behaviors of metamaterials with periodic multi-resonatorand voids in water”中提出一种内部嵌入多谐振器和空腔的组合结构,结果表明由于多谐振器和空腔之间的耦合共振,可以有效拓宽吸声频带,但在低频范围并不明显。文献“Sound absorption by rubber coatings with periodic voids and hard inclusions”中提出一了种吸声层内部具有周期性分布的硬夹杂物及空腔组合结构,利用与硬夹杂物及空腔有关的偶极共振和法布里-珀罗共振控制吸声,最终实现在500Hz处出现一个吸收峰,但低频吸收峰单一,同样存在吸声频带窄的问题。
发明内容
本发明要解决的技术问题是,针对现有技术存在的缺陷,提出一种内嵌散射体及空腔的指数梯度声学覆盖层,通过在硅橡胶基体中内嵌钢圆柱散射体或圆柱空腔,改变整体的密度分布,使整个吸声层的密度以阶跃形式呈现指数形式梯度变化,能够有效拓宽低频吸声频带,明显提高低频范围声学覆盖层的吸声性能并在中高频范围具有良好的吸声性能,有效降低水下结构的目标强度和辐射噪声。
本发明中所述声学覆盖层的设计通过以下所述技术方案来实现:
参见图1,本发明所述的一种内嵌散射体及空腔的指数梯度声学覆盖层,由匹配层、吸声层和钢背衬组成。匹配层由玻璃钢制成,其密度与水接近,特性声阻抗与水匹配,可以使水中的声波无反射的进入吸声层。吸声层由多个矩形单元阵列排列而成,每个单元以密度为1000kg/m3的硅橡胶为基体,内部嵌入两层钢圆柱散射体和两层圆柱空腔,内嵌的钢圆柱散射体和圆柱空腔沿单元中线位置垂直排列,每层散射体或空腔具有不同的等效密度,整体呈指数形式梯度分布,吸声两侧做封口处理。钢背衬用来模拟水下航行器壳体。吸声层单元之间涂抹粘接剂经冷压粘接在一起,匹配层、吸声层和钢背衬三者之间同样涂抹粘接剂经冷压组合成一体。
所述吸声层的每个单元中,钢圆柱散射体和圆柱空腔的长度均为1000mm,其轴线与单元的每个面平行,可以根据实际使用要求选择单元的数量自行制造。
吸声层密度分布满足曲线:
其中,y表示吸声层上某点到x轴的距离,单位为mm。吸声层厚度D=100mm,调节吸声层密度变化的系数λ=-1/40,单位为mm-1。为限制声学覆盖层的密度变化范围,需要设定ρ1和ρ2的值,这里ρ1=3000kg/m3,ρ2=500kg/m3。当y为0时,ρ(y)=ρ2,当y为D时,ρ(y)=ρ1。
将每个吸声层单元等厚分为4层,分层方式如图3所示,具体的等效密度在图3中标出。沿y轴方向所选取的4层介质的等效密度分别为582kg/m3、847.3kg/m3、1343kg/m3、2269kg/m3,每层介质内嵌散射体或空腔的半径通过均匀化计算等效密度来确定,等效密度等于总质量除以其排水体积。若等效密度大于1000kg/m3,则内嵌钢圆柱散射体来增加此层等效密度,若等效密度小于1000kg/m3,则内嵌圆柱空腔来降低此层等效密度。经均匀化方法计算得到4层介质的内嵌结构半径分别为9.12mm(空腔)、5.51mm(空腔)、3.15mm(钢圆柱)、6.05mm(钢圆柱)。每层具有不同的等效密度,使整个吸声层的密度呈现指数形式梯度分布。
所述吸声层每个单元中散射体和空腔的圆心距均为c=25mm,第一层散射体和第四层空腔的圆心距离顶端和底端均为d1=12.5mm,距离两端均为d2=12.5mm。
每个单元的尺寸相同,宽度t=25mm,匹配层厚度h=10mm,吸声总厚度D=100mm,钢背衬厚度s=20mm。
本发明提出了一种内嵌散射体及空腔的指数梯度声学覆盖层,可达到的有益技术效果:
通过在基体中内嵌钢圆柱散射体或圆柱空腔,改变整体的密度分布,使整个声学覆盖层具有梯度特性,并通过散射体和空腔共振实现低频吸声,出现多吸收峰且吸收峰向低频偏移的特点,有效拓宽了低频吸声带宽,解决了声学覆盖层低频吸声频带窄的问题。本发明具有良好的水下低频吸声效果,相比于均匀介质硅橡胶声学覆盖层在0-1000Hz范围内吸声性能得到明显提升,具有结构简单、制造工艺简单的特点。本发明所述声学覆盖层可以有效降低水下结构的目标强度和辐射噪声,可以铺设在船舶、舰艇或水下航行器等壳体外部提升其声隐身性能。
附图说明
图1本发明声学覆盖层整体结构示意图;
图2本发明吸声层的一个单元结构示意图;
图3本发明实施例1中吸声层等效分层方式;
图4本发明吸声层的单元截面示意图;
图5本发明实施例1中声学覆盖层的吸声系数曲线;
图6本发明实施例2中声学覆盖层的吸声系数曲线;
其中:1-匹配层;2-吸声层;3-钢背衬;4-圆柱空腔;5-钢圆柱散射体
具体实施方式
通过下述的附图和实施例作对本发明进一步说明。
结合图1所示的一种内嵌散射体及空腔的指数梯度声学覆盖层,由匹配层(1)、吸声层(2)和钢背衬(3)组成。匹配层的材料采用玻璃钢。吸声层有多个相同的单元阵列排列而成,每个单元以密度为1000kg/m3的硅橡胶为基体,内部嵌入圆柱空腔(4)和钢圆柱散射体(5),内嵌的钢圆柱散射体和圆柱空腔沿单元中线位置垂直排列,每层散射体或空腔的等效密度呈指数形式梯度分布,吸声层两侧做封口处理。每个单元中,钢圆柱散射体和圆柱空腔的长度均为1000mm,其轴线与单元的每个面平行。每个单元的尺寸相同,宽度t=25mm,匹配层厚度h=10mm,吸声层总厚度D=100mm,钢背衬厚度s=20mm。钢背衬用来模拟水下航行器壳体。吸声层单元之间涂抹粘接剂经冷压成型粘接在一起,匹配层、吸声层和钢背衬三者之间同样涂抹粘接剂经冷压成型组合成一体。吸声层采用一种硅橡胶材料作为基体,这种硅橡胶的密度为1000kg/m3,泊松比为0.4997,复杨氏模量为(1.879+0.540i)MPa。钢背衬的密度为7890kg/m3,泊松比为0.3,杨氏模量为210GPa。
吸声层密度分布满足曲线
其中,y表示吸声层上某点到x轴的距离,单位为mm。D=100mm。调节吸声层密度变化的系数λ=-1/40,单位为mm-1。采用一种等厚分层的方法设计吸声层的密度分布呈现指数梯度变化。将吸声层分为等厚的几层,通过在每层嵌入钢圆柱散射体或圆柱空腔得到不同的等效密度,这样使整个吸声层的密度以阶跃的形式呈现梯度变化。假设每层介质的等效密度为ρi,若ρi>ρ0,则需要嵌入钢圆柱,若ρi<ρ0,则需要嵌入空腔。每层介质内嵌散射体或空腔的半径通过均匀化计算等效密度来确定,等效密度等于总质量除以其排水体积。
实施例1
将每个吸声层单元等厚分为4层,分层方式如图3所示,具体的等效密度在图3中标出。沿y轴方向所选取的4层介质的等效密度分别为582kg/m3、847.3kg/m3、1343kg/m3、2269kg/m3,经均匀化方法计算的到4层介质的内嵌结构半径由下往上分别为9.12mm(空腔)、5.51mm(空腔)、3.15mm(钢圆柱)、6.05mm(钢圆柱)。每个单元中散射体和空腔的圆心距均为c=25mm,第一层散射体和第四层空腔的圆心距离顶端和底端均为d1=12.5mm,距离两端均为d2=12.5mm。图5给出了本发明所述梯度介质声学覆盖层和均匀介质声学覆盖层的吸声系数曲线。可以看出,4层梯度介质声学覆盖层吸收峰明显向低频偏移,并且在0-1000Hz内出现两个明显的吸收峰,第一个吸收峰出现在80Hz,峰值为0.54,第二个吸收峰出现在760Hz,峰值为0.67,明显拓宽了低频吸声频带,有效提升了低频吸声性能。
实施例2
不同于实施例1,实施例2中将吸声层等厚分成5层,分层方式与实施例1中方法相同。沿y轴方向所选取的5层介质的等效密度分别为564kg/m3、749.7kg/m3、1056.8kg/m3、1563kg/m3、2397.5kg/m3,经均匀化方法计算的到5层介质的内嵌结构半径由下往上分别为8.33mm(空腔)、6.31mm(空腔)、1.15mm(钢圆柱)、3.61mm(钢圆柱)、5.68mm(钢圆柱)。每个单元中散射体和空腔的圆心距均为c=20mm,第一层散射体和第四层空腔的圆心距离顶端和底端均为d1=10mm,距离两端均为d2=12.5mm。图5给出了本发明所述梯度介质声学覆盖层和均匀介质声学覆盖层的吸声系数曲线。可以看出,5层梯度介质声学覆盖层吸收峰明显向低频偏移,同样也在0-1000Hz内出现两个明显的吸收峰,第一个吸收峰出现在80Hz,峰值为0.53,第二个吸收峰出现在720Hz,峰值为0.64,明显拓宽了低频吸声频带,有效提升了低频吸声性能。
Claims (4)
1.一种内嵌散射体及空腔的指数梯度声学覆盖层,其特征在于,包括匹配层(1)、吸声层(2)和钢背衬(3);匹配层由玻璃钢制成,其密度与水接近,特性声阻抗与水匹配,可以使水中的声波无反射的进入吸声层;吸声层由多个矩形单元阵列排列而成,每个单元以密度为1000kg/m3的硅橡胶为基体,从钢背衬向匹配层方向依次嵌入两层圆柱空腔和两层钢圆柱散射体,其圆心沿单元中线位置垂直排列,等效密度递增且呈指数梯度分布;吸声层两端做封口处理;钢背衬用来模拟水下航行器壳体;吸声层单元之间涂抹粘接剂经冷压粘接在一起,匹配层、吸声层和钢背衬三者之间同样涂抹粘接剂经冷压组合成一体。
2.根据权利要求1所述的一种内嵌散射体及空腔的指数梯度声学覆盖层,其特征在于,每个单元中,钢圆柱散射体和圆柱空腔的长度均为1000mm,其轴线与单元的每个面平行,可以根据实际使用要求选择单元的数量自行拼接。
3.根据权利要求1所述的一种内嵌散射体及空腔的指数梯度声学覆盖层,其特征在于,吸声层每个单元中,等厚分成4层,每层介质内嵌散射体或空腔的半径通过均匀化计算等效密度来确定,等效密度等于总质量除以其排水体积;从匹配层向钢背衬方向依次第一层和第二层均为钢圆柱散射体,半径分别为a1=6.05mm、a2=3.15mm;第三层和第四层均为圆柱空腔,半径分别为a3=5.51mm、a4=9.12mm;每层具有不同的等效密度,使整个吸声层的密度以阶跃函数的形式呈现指数形式梯度分布。
4.根据权利要求3所述的一种内嵌散射体及空腔的指数梯度声学覆盖层,其特征在于,所述每个单元中散射体和空腔的圆心距均为c=25mm,第一层散射体的圆心距离顶端和第四层空腔的圆心距离底端均为d1=12.5mm,距离两端均为d2=12.5mm;宽度t=25mm,匹配层厚度h=10mm,吸声层总厚度D=100mm,钢背衬厚度s=20mm。
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