As urban rail transit networks expand, vibration and noise issues caused by train operations have become increasingly prominent. These challenges not only affect residents’ quality of life but also hinder sustainable urban development. Statistics show that wheel-rail noise accounts for more than 60% of total rail transit noise, and traditional damping methods can no longer meet stringent environmental standards. Polyurethane dampers, as a new-generation vibration control technology, are rapidly gaining attention for their outstanding performance—while Feilong Polyurethane Equipment provides the critical support needed for large-scale implementation.
Polyurethane Dampers: Technological Advantages and Performance Breakthroughs
Polyurethane dampers achieve significant improvements in vibration and noise control through material and structural innovation. Their core lies in a closed-cell micro-foam design, giving the product a static stiffness of 12 N/mm² and a loss factor greater than 0.3, while maintaining stable performance in extreme temperatures ranging from -150°C to 350°C. Service life is extended to 15–20 years, far exceeding traditional rubber materials.
Unlike conventional passive damping methods, polyurethane dampers utilize a resonance tuning mechanism that precisely matches the rail vibration peak frequency (150–400 Hz), enabling directional energy transfer and efficient dissipation. Engineering data shows they can reduce wayside noise by 7.9–8.4 dB(A) and rail vibration acceleration levels by 11–14 dB, with performance degradation of less than 1.6 dB after one year, demonstrating exceptional long-term stability.
Feilong Polyurethane Equipment: The Driving Force Behind Scalable Production
Bringing polyurethane dampers from lab prototypes to real-world engineering requires highly efficient and precise production equipment. Feilong Polyurethane Equipment delivers this with modular design + intelligent process control, addressing industry challenges like flexible production of multiple product specifications and high-precision molding of complex cross-sectional structures.
The equipment adopts a four-module system (“Tank–Pump–Head–Control”) with dynamic pressure balance technology, keeping material temperature deviation within ±2°C. Combined with a high-precision metering pump system, it achieves overall output accuracy ≤0.5% and ratio repeatability ≤0.8%, ensuring material consistency for large-scale damper production.
For damping components with variable cross-sections and multi-cavity structures, Feilong equipment integrates intelligent program control and patented casting head technology to achieve one-shot molding. Its floating mechanical seal casting head can work continuously for hours without overheating or material leakage, ensuring uniform filling in complex flow paths and extending product fatigue life by 25%.
Engineering Applications and Verified Results
Polyurethane dampers have been successfully applied in metro projects. Field tests show wayside noise reduction of 7.9–8.4 dB(A), with peak performance near 400 Hz reaching 11.3–11.7 dB(A), and rail vertical vibration acceleration levels reduced by 11–14 dB. One-year re-inspection revealed performance decay of less than 1.6 dB, proving long-term reliability.
Behind these results is Feilong’s metering accuracy of 0.5%, ensuring strict control of critical parameters and product uniformity. This forms a closed-loop system of material performance, equipment precision, and engineering effectiveness.
Technology Integration and Future Outlook
The future of rail vibration and noise reduction is moving toward intelligent and eco-friendly solutions. Smart dampers integrated with IoT sensors and digital monitoring will enable real-time condition tracking and performance optimization, while eco-friendly materials will further minimize environmental impact.
Feilong is already advancing in this direction, upgrading toward intelligent equipment and sustainable material solutions, evolving from a product supplier into a comprehensive system solution provider. As global rail transit continues to grow, Feilong Polyurethane Equipment will remain a key technology driver for high-quality, sustainable development.
Conclusion
Polyurethane damper technology—through material innovation and equipment precision—offers an efficient solution for vibration and noise reduction in rail transit. Feilong Polyurethane Equipment, as the industry’s technical backbone, enables high-precision manufacturing and flexible production, accelerating the transition from R&D to mass application, and paving the way for green, smart, and comfortable urban transportation systems.
