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Rail Transit Exhibition News The Korea Railroad Technology Research Institute (hereinafter referred to as the "Railroad Research Institute") recently announced that it has successfully developed a new technology to reduce the noise of high-speed railway vehicles using lightweight materials. This technology is expected to significantly improve ride comfort by reducing vehicle weight and reducing energy consumption while effectively suppressing noise transmitted into the cabin.
In December last year, the institute released the research results of the core technology of the next-generation high-speed train (EMU-370), which is the result of the Ministry of Land, Infrastructure, Transport and Tourism's national research and development project. The EMU-370 is designed to operate at a speed of 370 kilometers per hour, and it is planned to start vehicle manufacturing this year and start trial operation from 2030.
Although the speed of the train can effectively shorten the travel time, the resulting external noise may be transmitted into the carriage, which may lead to a decrease in ride comfort, so related technical research continues to be paid attention to. Traditional noise reduction solutions mostly use the method of filling the car body with sound-absorbing materials, but this will increase the weight of the car body, making it difficult to take into account the needs of lightweight.
In order to solve the problem of noise in the train caused by the increase in speed, the railway research institute embedded lightweight acrylic material in the internal cavity of the aluminum alloy extruded profile, the main structural material of the train body, so as to greatly improve the sound insulation performance (i.e., through loss).
In order to achieve lightweight, existing railway vehicles generally use hollow double-layer plate structure aluminum alloy extrusion profiles. However, this structure is prone to cavity resonance in a specific frequency range, resulting in significant shortcomings in sound insulation performance.
The new technology developed by the Railway Research Institute fills acrylic plastic, which is 44% less dense than aluminum alloy, in the optimal form of the profile cavity. This solution breaks through the traditional idea of "thickening the siding and increasing weight", which can not only improve the rigidity of the structure, but also artificially intervene in the vibration mode of the internal air layer, so as to effectively control noise propagation.
In this study, two reinforcement schemes are proposed, namely "partial reinforcement" and "comprehensive reinforcement", which have been verified to achieve noise reduction effects of more than 3 decibels. After applying this technology to existing high-speed railways, noise reduction of 3 decibels can make passengers in the car feel a significant improvement in comfort.
In addition, this technology overcomes the disadvantages of traditional sound-absorbing materials that harden and deteriorate over time, and the manufacturing process is simple, and it has received positive reviews in terms of economy and practicality. Compared with the traditional sound-absorbing material solution, the new technology can achieve the same or even better noise reduction effect under the premise of minimal weight gain of the car body, and can be superimposed with existing solutions such as sound absorption materials and sound insulation materials.
Lu Ximin, a senior researcher at the Railway Research Institute, said: "The use of lightweight materials to strengthen the internal structure is a technology that kills two birds with one stone to achieve both lightweight and noise reduction comfort of railway vehicles, and will not only be suitable for high-speed trains in the future, but also contribute to the improvement of the riding experience of various railway vehicles such as urban rail transit." ”
Sikong Ming, president of the Railway Research Institute, said: "This is a research result oriented to meet the needs of the public, aiming to provide passengers with a quieter and more comfortable high-speed rail travel experience. In the future, we will continue to strive to achieve noise reduction, lightweight, energy conservation and emission reduction while improving speed, so as to effectively enhance the public's sense of gain. ”
