CAJ | 학술논문

弹性板式结构具有良好的消声性能，在低频宽带消声性能上有优于传统的共振腔式抗性或多孔吸声材料阻性被动消声器的潜力。文章计算分析了弹性板及其背腔几何和材料参数对消声器性能的影响。研究表明：弹性板一阶固有频率越低其低频消声性能越好，因此应选择较大面积弹性板、低刚度质量比的弹性板材料；充液背腔对弹性板约束越小，弹性板弹性振动越强烈，板振动引起的声反射效果越好，因此空气背腔低频宽带消声性能优于充水背腔。在实现相同低频宽带消声性能的情况下，空气背腔尺寸相对于充水背腔更为紧凑，适用于消声器允许安装空间较小的环境。此外，通海水管路系统工作于不同水深条件，背腔充气压力应与管内背景压力持平；对不同充气压力下消声性能的计算对比显示：充气背腔消声器在大背景压力下仍能获得良好的低频宽带消声性能，且由于背腔空气附加质量影响低频消声性能略有提升。
탄성판식결구구유량호적소성성능，재저빈관대소성성능상유우우전통적공진강식항성혹다공흡성재료조성피동소성기적잠력。문장계산분석료탄성판급기배강궤하화재료삼수대소성기성능적영향。연구표명：탄성판일계고유빈솔월저기저빈소성성능월호，인차응선택교대면적탄성판、저강도질량비적탄성판재료；충액배강대탄성판약속월소，탄성판탄성진동월강렬，판진동인기적성반사효과월호，인차공기배강저빈관대소성성능우우충수배강。재실현상동저빈관대소성성능적정황하，공기배강척촌상대우충수배강경위긴주，괄용우소성기윤허안장공간교소적배경。차외，통해수관로계통공작우불동수심조건，배강충기압력응여관내배경압력지평；대불동충기압력하소성성능적계산대비현시：충기배강소성기재대배경압력하잉능획득량호적저빈관대소성성능，차유우배강공기부가질량영향저빈소성성능략유제승。
Plate-silencer possesses low frequency and broadband noise attenuation characteristics, which is potentially better than conventional holmholtz resonators and porous sound absorbing materials. In this paper, material and geometric coefficients of plate and cavity are analyzed. The study shows that the less cavity restraining on plate is, the more effective silencers is and the lower plate first resonate frequency is, the lower noise attenuation frequency is. Therefore, low spring-mass-ratio plate with large area is preferred;more compact geometric silencer can be realized with air cavity other than water cavity for retaining low frequency and broadband noise attenuation characteristics. Influence of pressured air cavity on TL is an-alyzed and the results indicate that plate silencers retain low frequency broadband noise attenuation char-acteristics under higher pressure conditions, and the noise attenuation broadband expanded and shift to low frequency.