In modern cities, rail transit systems are like the pulse of the city, providing millions of residents with fast and convenient ways to travel. However, with the continuous expansion of the track network and the increase in the frequency of trains running, the problem of noise pollution has also intensified. This noise not only affects the quality of life of residents along the route, but also poses a potential threat to the health of rail transit staff. According to research by the World Health Organization (WHO), long-term exposure to high noise environments can lead to hearing damage, sleep disorders, and psychological stress. <\/p>\n
Noise pollution mainly comes from mechanical friction, wheel and rail contact and aerodynamic effects when trains are running. For example, the vortex of airflow generated when a high-speed train passes will create a sharp whistling sound, while the high-frequency vibration between the wheels and the rails will produce a harsh metallic sound. In addition, noise during braking or acceleration of the train can also significantly increase the sound pressure level in the environment. These noises are particularly prominent in enclosed urban spaces, as buildings and ground reflections further amplify the sound intensity. <\/p>\n
To address this challenge, scientists and engineers are exploring innovative materials and technologies to reduce noise pollution. Among them, polyimide foam stabilizer, as a new sound insulation material, has gradually become a new favorite in the field of urban rail transit due to its excellent sound absorption performance and lightweight properties. It not only effectively absorbs high-frequency noise, but also maintains stability and durability for a long time, providing new possibilities for solving noise problems. <\/p>\n
Next, we will explore in-depth the working principle of polyimide foam stabilizers and their specific application in the field of rail transit, and analyze how it can help create a quieter and more comfortable travel environment. <\/p>\n
Before exploring how polyimide foam stabilizers become the “sound insulation pioneer” in urban rail transit, we need to understand the unique properties of this material and the scientific principles behind it. Polyimide foam stabilizer is a high-performance polymer material known for its excellent thermal stability, chemical resistance and mechanical strength. These characteristics allow them to maintain excellent performance in extreme environments, making them ideal for applications where long-term stability is required. <\/p>\n
First, let’s look at why polyimide foam stabilizers are so special from the perspective of molecular structure. Polyimide is a polymer formed by polycondensation reaction of aromatic dianhydride and aromatic diamine, and its molecular chains contain a large number of ring structures. This highly rigid molecular framework imparts excellent thermal stability and mechanical strength to the polyimide. At the same time, due to the strong hydrogen bonding between its molecular chains, polyimide also exhibits excellent chemical stability and can resist the erosion of most solvents and chemicals. <\/p>\n
Secondly, foaming treatment is a key step in achieving efficient sound insulation for polyimide materials. By introducing gas into the polyimide matrix, a large number of tiny and uniform can be formedDistributed bubbles. These bubbles not only significantly reduce the overall density of the material, but also greatly enhance their sound absorption capacity. When sound waves enter the foam structure, multiple reflections and scatterings occur on the bubble wall, which are effectively converted into heat energy consumption. Therefore, polyimide foam stabilizers can significantly reduce noise propagation, especially the noise reduction effect in the high frequency range is particularly obvious. <\/p>\n
In addition, the polyimide foam stabilizer also has good damping properties, which means it can effectively suppress the transmission of vibration energy. This characteristic is particularly important for reducing mechanical noise generated during train operation. By applying polyimide foam stabilizer to sound insulation barriers inside the car or next to the track, the noise level can be significantly reduced and the living comfort of passengers and surrounding residents can be improved. <\/p>\n
To sum up, the reason why polyimide foam stabilizers can stand out in the field of urban rail transit is due to their unique molecular structure, efficient foaming treatment process and excellent physical and chemical properties. Together, these features ensure its excellent performance in practical applications and provide a powerful tool for solving the problem of noise pollution. <\/p>\n
The polyimide foam stabilizer has a wide range of applications, especially in the field of urban rail transit. Its versatility and high efficiency make it an ideal choice for reducing noise pollution. Below we will discuss several main application scenarios in detail and analyze their effects and advantages in actual use through specific cases. <\/p>\n
Inside the train compartment, polyimide foam stabilizer is used as the lining material to reduce the transmission of noise inside and outside the compartment. For example, in a subway project, after using polyimide foam as the lining material for the side walls and ceiling of the car, the noise level in the car dropped significantly by about 20 decibels. This not only improves passengers’ ride comfort, but also reduces the occupational risk of drivers due to long-term exposure to high noise environments. <\/p>\n
| Application Scenario<\/th>\n | Material Thickness (mm)<\/th>\n | Frequency Range (Hz)<\/th>\n | Noise Reduction Effect (dB)<\/th>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Car lining<\/td>\n | 5-10<\/td>\n | 1000-4000<\/td>\n | 15-20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n2. Soundproofing barrier beside the track<\/h4>\nInstalling sound insulation barriers next to the track is another effective noise reduction measure. Polyimide foam stabilizers have become an ideal material for the manufacture of sound insulation barriers due to their lightweight and high strength. For example, a polyimide foam sound insulation barrier installed next to a light rail line successfully transformed the residential areas along the route.The noise level was reduced by about 15 decibels, significantly improving the quality of life of residents. <\/p>\n
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