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High-performance elastomeric systems engineered to isolate ground-borne noise and structural vibrations in sensitive theater and acoustic environments.
Modern cities are expanding at an unprecedented rate, with subterranean rail systems, light rails, and trams weaving through dense commercial and cultural corridors. This proximity creates a critical challenge: high-energy, low-frequency vibrations generated by passing trains travel through the ground as structure-borne noise. When these vibrations reach structural foundations, they radiate into buildings as audible hums and physical tremors.
For sensitive structures like grand theaters, opera houses, recording studios, and acoustic research rooms, ground-borne noise is a catastrophic issue. Standard architectural acoustic treatments—such as wall absorption panels or double-glazed windows—are completely ineffective against low-frequency vibrations entering through the building's foundation. The solution must be applied at the source: the rail track itself. This is where the Rail Encapsulation Protection System becomes the definitive line of defense.
Acoustic Challenge: Traditional ballasted tracks transmit up to 90% of dynamic wheel-rail impact energy directly into the surrounding soil. Our encapsulation systems absorb and dissipate this energy, reducing structure-borne noise levels by up to 15-20 dB(A) in adjacent structures.
Founded in 1995, Changmei Technology has been active in the rail transit vibration and noise reduction industry for over 30 years. The company currently offers more than 300 products across six major series, all focused on vibration and noise control for rail transit.
A highly specialized team of engineers, researchers, and industry experts dedicated to pushing the boundaries of acoustic and vibration engineering.
How specialized rail encapsulation systems protect sensitive acoustic spaces from structural vibrations.
Grand theaters require a Noise Criterion (NC) rating of NC-15 to NC-20 to ensure classical performances can be heard without background noise. Encapsulation profiles cushion the rail, preventing low-frequency rumbling from entering the theater's fly tower and stage floor.
Anechoic and semi-anechoic chambers used for product testing require absolute silence. Ground vibrations alter delicate sensor readings. Continuous rail encapsulation decouples the track bed, maintaining the chamber's environmental baseline.
High-sensitivity condenser microphones pick up structural micro-vibrations as low-frequency mud. By wrapping the rails in tailored polyurethane profiles, we eliminate the structural transmission path before the vibration can propagate.
The Rail Encapsulation Protection System works by completely surrounding the rail profile with a high-performance elastomeric compound, typically microcellular polyurethane or specialized synthetic rubber. This wrapper acts as a spring-mass damper system. When a train passes, the elastomer deflects elastically, converting kinetic energy into heat energy, thereby drastically reducing the mechanical force transmitted to the concrete slab and surrounding ground.
Furthermore, this system provides continuous vertical and lateral support to the rail, which not only dampens noise but also extends the operational lifespan of the rail by reducing wear. The system is designed to handle extreme static and dynamic loads while maintaining its damping efficiency for decades, making it a highly cost-effective solution for municipal planners and developers of acoustic facilities.
Over a quarter-century of innovation, engineering excellence, and specialized manufacturing in vibration control.
Build a Chinese national brand. To become a pioneer in vibration and noise control materials for rail transit, high-end construction, and precision instrumentation.
Green factory officially comes on stream
Green Factory Solar cell workshop area: 48,500 m²
Smart factory OA & ERP & MES Full Deployment
Technology Upgrade: Built the only polyurethane continuous foaming mat production line in China
Following the 'Specialized, Refined, Distinctive, and Innovative' (SRDI) development path, we are dedicated to advancing the application of vibration-absorbing and noise-reduction materials in urban rail transit.
Industrial Transformation: Entering the Urban Rail Transit Power Supply Sector
Changmei Established
Our comprehensive portfolio of vibration isolation and track system components.
| Main Products | Category | Subcategory |
|---|---|---|
| Main Products & Solutions | Rail Transit | Track Vibration Damping & Noise Reduction Products |
| Track Fastening Systems / Products for Tram/Tramway Track Systems | ||
| Track Power Supply & Protection Products | ||
| Building & Industrial Vibration Damping | Polyurethane Vibration Damping Pad / Rubber Granules for Vibration Damping / Building Vibration Isolation Bearing / Vibration Damping Pad for Industrial Equipment |
Injection molding workshop: Equipped with 22 injection molding machines and 5 compression molding machines.
Mold Engineering Department: Equipped with more than 20 units of CNC machining centers, EDM machines, wire cutting machines, and other digital processing equipment. Capable of in-house development of injection molds, rubber molds, and SMC molds for rail transit applications, including automatic core-pulling molds for sleeves. Annual mold and tooling output: 300 sets.
Injection Molding
Rubber Vulcanization
Automated Damping Elastomer
Polyurethane Foaming Line
Tooling & Mold Manufacturing
The efficiency of a Rail Encapsulation Protection System is heavily dependent on the material's dynamic-to-static stiffness ratio. A lower ratio ensures that the material remains soft and highly elastic under dynamic loads, allowing it to isolate high-frequency vibrations effectively without compromising the physical stability of the track. If the material is too stiff, it acts as a acoustic bridge, transmitting vibrations. If it is too soft, the track may deflect excessively, posing safety risks to transit operations.
Our research and development focus has yielded custom-formulated microcellular polyurethane elastomers that balance these conflicting requirements. By adjusting the cell structure and density, we can tune the natural frequency of the track system to match the specific acoustic requirements of adjacent theaters and recording studios, targeting frequencies between 5 Hz and 20 Hz where human hearing and structural elements are most sensitive.
Future Trends: The industry is shifting toward smart encapsulation systems embedded with fiber-optic strain sensors and piezoelectric sensors. These systems monitor rail deflection, temperature, and material degradation in real-time, providing predictive maintenance alerts and ensuring consistent acoustic performance over the system's lifetime.
High-volume manufacturing capabilities to support large-scale urban infrastructure projects worldwide.
| Category | Output |
|---|---|
| Polyurethane foam isolation mats | 1,500,000 m² |
| Vibration and noise damping products | 500,000 sets |
| Rail power supply insulation and protection products | 100,000 sets |
Demonstrated quality and compliance with international standards in manufacturing and performance testing.
| Category | Count / Standard |
|---|---|
| National authorized patents | 107 |
| Invention patents | 16 |
| Technical achievements | 28 |
| ISO 9001:2015 | Product quality assurance |
| ISO 14001:2015 | Environmental responsibility and corporate commitment |
| ISO 45001:2018 | Occupational health and safety management |
| ISO 22163 (Railway applications) | Under application / Pending Certification |
| CRCC-Certified Products | 5 categories, 10+ models |
National Patent Doc 1
National Patent Doc 2
Invention Patent Doc
CNAS Test Report
Product Test Report
Product Quality Cert
CRCC Certificate
ISO 9001 Certificate
Explore our full range of vibration damping, isolation, and track protection products designed for high-performance acoustic applications.
