In recent years, among various urban noises, the average level of urban road traffic noise is about 72 dB. According to the regulations, the ambient noise limit in general residential areas should not exceed 55 dB during the day and 45 dB at night. If you can't control the noise attack, you just need to reduce the noise. Noise insulation panels are a common method of noise reduction.
Sound insulation panels consist mainly of steel structural columns and acoustic screens. The column is the main force-bearing member of the sound insulation panel, which is fixed to the pre-built steel plate on the road crash wall or track side by bolting or welding; the acoustic screen is the main sound insulation and sound absorption component, which is fixed in the H-shaped column slot by high-strength safety clips to form a sound barrier. Sound insulation panels The following are the environmental requirements for road sound insulation panel installation sites.
Whether the sound source surface is too wide. Traffic noise is usually regarded as a linear source. Nowadays there are four, six, eight and even twelve lanes on the highway. Such a sound source cannot be treated as a linear sound source. If the sound source surface is too wide, the noise component in contact with the sound insulation panel will be greatly reduced and its sound insulation effectiveness will be greatly reduced.
Whether there is a sound-reflecting surface in the surroundings. If there are sound-reflecting surfaces in the surroundings, the design of the sound insulation panel becomes very difficult. Since the noise reflected by the reflective surface will not come into contact with the sound insulation panel, the noise reduction effect of the panel will be greatly reduced. For example, installing sound insulation panels at the edge of a city street is not effective. Since the buildings on both sides of the street are reflective surfaces, the reflected sound greatly reduces the effectiveness of the sound insulation panels.
Puncturing a data-dense panel or wall between the sound source and the sound reception point, consistent with area density, gives significant additional attenuation of sound wave propagation. This punctured third party is called a sound insulation panel, also known as a sound insulation wall, and is an important way to reduce traffic noise and can be used to isolate noise sources such as highways and elevated composite roads.
There are three main links in any acoustic system, namely the sound source, the transmission method and the receiver. In the process of propagation, sound waves will reflect, transmit and diffract when they encounter sound insulation panels. The sound insulation panel can block the straight line propagation of sound, make a satisfactory attenuation of diffracted sound, and have negligible effect on the propagation of sound.