The roof system consists of main purlin, bottom plate, secondary purlin, absorption sound layer, insulating layer and faceplate.
屋面系统由主檩条、底板、次檩条、吸音层、保温层和面板组成。
Its good characteristics include low cost high durability and good property of sound absorption.
它具有成本低、耐久性高、吸声性能好的特点。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.
结果表明材料的平均吸声系数和降噪系数分别达0。58和0。60，且材料的中低频吸声性能优良。
The sound absorption coefficiet of osb was tested by the stationary wave method. the results showed that the osb had good sound absorption property compared with brick and concrete.
采用驻波管法测定定向结构刨花板的吸声系数，分析比较了定向结构刨花板与砖、混凝土吸声性能的差异。结果表明，定向结构刨花板具有良好的吸声性能。
Sound absorption materials is always used in controlling reverberation time in the acoustical design of studios.
对演播厅混响时间的控制，在声学设计上往往通过安装吸声材料来实现。
Adding a back lining at one side of the porous metal material is an effective and workable way to improve its sound absorption properties.
而在多孔金属材料一侧添加背衬是一种提高吸声性能的有效可行的方法。
This paper derives the best range of thickness of the materials by analyzing the main factors influencing the sound absorption properties of porous metal materials.
通过分析影响多孔金属材料吸声性能的主要因素，推导出材料的最佳厚度范围；
A three-dimensional transfer matrix model was presented to simulate the sound absorption coefficients of the graded polyurethanes based on relation of stress and strain of polymers.
根据高分子材料中三维应力应变关系建立了三维传递矩阵数学模型，模拟梯度聚氨酯在不同入射角下的吸声性能。
This dissertation does deep research in sound absorption performance of MR from theory and experiment aspects and indicates the sound absorption and noise reduction property of MR.
本文的研究揭示了金属橡胶材料的吸声降噪性能，对金属橡胶材料吸声特性进行了深入的理论和试验研究。
An adaptive control approach applied to practical active sound absorption systems is presented.
研究了实际系统中有源声吸收自适应控制方案。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
Its good characteristics include low cost, high durability and good property of sound absorption.
它具有成本低、耐久性高、吸声性能好的特点。
In order to make travelers as comfortable as possible, the train utilizes shock absorption, as well as sound insulation to minimize the sounds of standard operation.
为了使旅客尽可能舒适，列车采用吸音、隔声等技术使标准操作的声音最小化。
Sound absorption and insulation is the acoustical characteristic of material. Measurement of sound absorption and insulation has an important significance in noise control and acoustical design.
吸声与隔声是材料的声学特性，吸声与隔声测量对噪声控制与声学设计具有重要意义。
The results show that the appropriate combination of sound absorption materials and sound absorption structures can improve the sound absorption effect, and the absorption broadband is widened.
结果表明，吸声材料与吸声结构的有机结合显著提高了结构的吸声效果，拓宽了吸声频带宽度。
Methods Use a standing wave tube to measure the sound absorption coefficient of many kinds of grain.
采用驻波管法测量了多种粮食的吸声系数。
This article analyses the principle of detecting circuit in TV receiver. and explains theoretically the correct absorption of first sound IF so as to keep the sound from interfering the picture.
本文分析了电视机检波电路的原理，从理论上说明了伴音第一中频应吸收的强度，以使图象不受伴音干扰。
It found that the graphite changed the density of the coating, and improved the sound-absorption coefficient of the coating.
试验结果表明，石墨改变了涂层的密度，提高了涂层的吸声系数。
A novel sound absorption technology, semi-passive piezoelectric sound absorption, is presented and its performance is analyzed used electrical equivalent model in this paper.
提出了一种吸声新技术——半被动压电吸声技术，并对其进行了等效电路模型分析。
Excellent for sound absorption, insulation, gasketing pipe wrap and other applications.
尤其适用于消声、绝缘、包裹填充管等。
The sound absorption properties of foamed aluminum are introduced and the effects of thickness, porosity, compression ratio, air cavity depths on sound absorption property are studied.
介绍了泡沫铝的吸声特性，研究了泡沫铝的厚度、孔隙率、压缩率、空腔对其吸声性能的影响。
In applied acoustics field, the sound absorption measurement of an acoustic material and structure is always an important and basic task.
在应用声学领域，声学材料与结构的吸声测量始终是一项重要的工作。
Elastic mid-strength rock wool board: used for heat preservation, fireproofing and sound absorption for the building wall/roof, such as curtain wall, inner wall partition and elevator hoistway, etc.
有弹性，中等强度岩棉板：适用于建筑墙体/屋顶保温、防火、吸音，如幕墙、内墙隔断、电梯井等。
The paper chooses the appropriate muffler, and experiments with the capability of sound absorption material, and designs the dustproof project.
本文通过选择合适的消声器以及吸声材料实验和防尘方案的设计。
When the non-homogenous layer is divided, the sound absorption performance of the structures is increased in low frequency.
结果表明，对非均匀层进行分层后，结构在低频时的吸声性能有所提高。
When the porosity and pore diameter reduced, the sound absorption curve moved to the low frequency zone and the frequency bandwidth increased at the same time.
随着孔隙率、孔径的减小，多孔铝的共振吸声系数有所下降，吸声频谱曲线向低频方向移动，且频带宽度展宽。
Attenuation was paid to the study on the sound absorption mechanism of water-soluble polymer during dissolving.
研究了水溶性高分子涂料在其溶解过程中的吸声机理。
This research provided a new technique that two procedure foaming technique to produce composite Polyurethane foam, and made a research on its sound absorption property.
采用二次发泡工艺制备出一种声学性能优良的聚氨酯多层复合泡沫吸声材料，并对其吸声性能进行了研究分析。
This research provided a new technique that two procedure foaming technique to produce composite Polyurethane foam, and made a research on its sound absorption property.
采用二次发泡工艺制备出一种声学性能优良的聚氨酯多层复合泡沫吸声材料，并对其吸声性能进行了研究分析。
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