How about the anti noise effect of Jinan push-pull canopy membrane structure?

膜结构建筑具有防噪功能很有需要，在一些运动场膜结构，体育场膜结构，球场膜结构，广场膜结构，舞台膜结构等。膜结构建筑防噪功能的实现是通过膜结构声学设计集中围绕两方面的声学品质进行。1，如何屏蔽外部噪声对建筑的影响；2，建筑轮廓对回声作用与混响时间影响。噪声与回声需要考虑的因素截然不同，但两者须同时考虑，井评价建筑声环境综合品质。

Membrane structure building has the function of noise prevention, which is in great need. In some sports fields, stadium membrane structure, stadium membrane structure, square membrane structure, stage membrane structure, etc. The realization of anti noise function of membrane structure building is through the acoustic design of membrane structure, focusing on two aspects of acoustic quality. 1. How to shield the impact of external noise on the building; 2. Influence of building contour on echo effect and reverberation time. Noise and echo need to consider different factors, but they must be considered at the same time to evaluate the comprehensive quality of building acoustic environment.

一、回声1、 Echo

回声时间与建筑体积成正比，与内表面吸声率成反比。好的语音品质要求回声时间短，从而减少声渡间的相互干扰，这对小型会议室一般不会有困难，但大型闭合的建筑空间解决这一问题困难，如体育馆、室内田径场、水上活动中心、体育场等。

The echo time is directly proportional to the building volume and inversely proportional to the sound absorption rate of the inner surface. Good voice quality requires short echo time, so as to reduce the mutual interference between sound crossings, which is generally not difficult for small conference rooms, but it is difficult to solve this problem in large closed building space, such as gymnasium, indoor track and field field field, water sports center, stadium, etc.

根据建筑设计的总体规划、功能、经济预算，选择性价比的膜设计方案：

According to the overall planning, function and economic budget of architectural design, the membrane design scheme with cost performance is selected:

1)双层膜方案。PVC外膜加PVC内膜、PTFE外膜加PVC内膜、PTFE外膜加PTFE内膜，内衬膜主要控制吸声指标，外膜以建筑耐久性、结构性为主。

1) Double membrane scheme. PVC outer membrane plus PVC inner membrane, PTFE outer membrane plus PVC inner membrane, PTFE outer membrane plus PTFE inner membrane. The inner membrane mainly controls the sound absorption index, and the outer membrane is mainly architectural durability and structure.

2)双层膜加隔声层方案。注意隔声材料与隔热保温材料兼容性，以及与透光率的协调。

2) Scheme of double-layer membrane and sound insulation layer. Pay attention to the compatibility between sound insulation materials and thermal insulation materials, as well as the coordination with light transmittance.

3)PTFE、PVC单层膜方案。

3) PTFE and PVC single-layer membrane scheme.

二、外部噪声隔离

2、 External noise isolation

先考虑膜结构的朝向和位置，以便限度地减少噪声渗入。除建筑物的位置外还应考虑隔声设施的设计，以减少地面传输的常见噪声，并将噪声源和结构隔开。一般情况下，将声源与建筑物之间的距离每增加一倍，噪声减少6dB，而利用灌木丛隔离噪声只能减少0.4dB，以可以忽略不计。

First consider the orientation and position of the membrane structure in order to minimize noise infiltration. In addition to the location of common noise transmission facilities, the design of noise transmission facilities on the ground shall also be considered to reduce the noise. In general, the noise will be reduced by 6dB every time the distance between the sound source and the building is doubled, while the noise isolated by bushes can only be reduced by 0.4db, which can be ignored.

增加膜的层数、控箭夹层厚度以及时在膜层上附重都是增加降噪的可用方法。需要仔细考虑膜结构的连接，其密闭性，减少通过空气传播的噪声从缝隙中渗入的可能性。要同时保障在采取这些措施时不应使建筑物的热工性能受到影响。

Increasing the number of layers of the film, the thickness of the rocket control interlayer and the weight on the film are the available methods to increase the noise reduction. It is necessary to carefully consider the connection of membrane structure and its tightness, so as to reduce the possibility of infiltration of air-borne noise from the gap. At the same time, it should be ensured that the thermal performance of the building should not be affected when these measures are taken.

与大多数建筑声学的处理一样，将配套设施和其他噪声源发出的噪声从结论中分离是重要的。室内吸声面的认真设计也很重要，因为吸声减弱室内背景噪声的影响。

As with most architectural acoustics, it is important to separate the noise emitted by supporting facilities and other noise sources from the conclusion. Careful design of indoor sound absorption surface is also important because sound absorption reduces the impact of indoor background noise.

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