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

膜結構建筑具有防噪功能很有需要，在一些運動場膜結構，體育場膜結構，球場膜結構，廣場膜結構，舞臺膜結構等。膜結構建筑防噪功能的實現是通過膜結構聲學設計集中圍繞兩方面的聲學品質進行。1，如何屏蔽外部噪聲對建筑的影響；2，建筑輪廓對回聲作用與混響時間影響。噪聲與回聲需要考慮的因素截然不同，但兩者須同時考慮，井評價建筑聲環境綜合品質。

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、回聲1、 Echo

回聲時間與建筑體積成正比，與內表面吸聲率成反比。好的語音品質要求回聲時間短，從而減少聲渡間的相互干擾，這對小型會議室一般不會有困難，但大型閉合的建筑空間解決這一問題困難，如體育館、室內田徑場、水上活動中心、體育場等。

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.

根據建筑設計的總體規劃、功能、經濟預算，選擇性價比的膜設計方案：

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

1)雙層膜方案。PVC外膜加PVC內膜、PTFE外膜加PVC內膜、PTFE外膜加PTFE內膜，內襯膜主要控制吸聲指標，外膜以建筑耐久性、結構性為主。

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)雙層膜加隔聲層方案。注意隔聲材料與隔熱保溫材料兼容性，以及與透光率的協調。

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單層膜方案。

3) PTFE and PVC single-layer membrane scheme.

二、外部噪聲隔離

2、 External noise isolation

先考慮膜結構的朝向和位置，以便限度地減少噪聲滲入。除建筑物的位置外還應考慮隔聲設施的設計，以減少地面傳輸的常見噪聲，并將噪聲源和結構隔開。一般情況下，將聲源與建筑物之間的距離每增加一倍，噪聲減少6dB，而利用灌木叢隔離噪聲只能減少0.4dB，以可以忽略不計。

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.

增加膜的層數、控箭夾層厚度以及時在膜層上附重都是增加降噪的可用方法。需要仔細考慮膜結構的連接，其密閉性，減少通過空氣傳播的噪聲從縫隙中滲入的可能性。要同時保障在采取這些措施時不應使建筑物的熱工性能受到影響。

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.

與大多數建筑聲學的處理一樣，將配套設施和其他噪聲源發出的噪聲從結論中分離是重要的。室內吸聲面的認真設計也很重要，因為吸聲減弱室內背景噪聲的影響。

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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