Dampers
Precision-engineered for structural integrity, expansion joints ensure seamless movement accommodation, exceptional load resistance, and long-term durability, delivering optimal performance in dynamic bridge and infrastructure applications
OVM Viscous Fluid Dampers
OVM Viscous Fluid Dampers (VFDs) are high-performance hydraulic devices designed to enhance structural resilience by dissipating energy from seismic or wind-induced forces. Unlike traditional damping systems, OVM VFDs introduce no initial stiffness or additional internal force, ensuring that they do not alter the structure’s natural period, vibration mode, or static response.
By efficiently absorbing rapid deformations caused by earthquakes, OVM Viscous Fluid Dampers effectively reduce acceleration and displacement, minimizing structural stress and damage.
Working Principle
At the core of OVM’s viscous damper is an advanced hydraulic damping system, which consists of:
🔹 Piston Rod & Piston – Transmits and regulates damping force.
🔹 Damping Medium (High-Viscosity Fluid) – Flows through damping holes to generate energy dissipation.
🔹 Damping Chamber & Sealing System – Ensures stable performance and leak-proof operation under extreme conditions.
When subjected to earthquake or wind forces, the piston rod is displaced, causing the damping medium to flow through precision-engineered damping holes, creating pressure differentials that generate a damping force. This controlled dissipation of kinetic energy effectively reduces the structural vibration response and enhances overall stability.
Key Features & Advantages
- Superior Seismic & Wind Energy Dissipation
OVM Viscous Fluid Dampers efficiently absorb dynamic forces, protecting bridges, buildings, and infrastructure from excessive vibrations. - No Impact on Structural Stiffness or Period
Since the dampers do not introduce additional internal forces, they preserve the natural frequency and mode shapes of the structure. - Compact, Lightweight & Easy to Install
The smaller size and modular design of OVM VFDs make them ideal for both retrofitting existing structures and integrating into new designs. - High Durability & Minimal Maintenance
Engineered with corrosion-resistant materials and a robust sealing system, OVM VFDs ensure long-term reliability with minimal maintenance requirements. - Temperature-Insensitive Performance
Designed to operate effectively across a wide temperature range, ensuring consistent damping efficiency in extreme climates.
Applications
- Bridges & Viaducts – Enhances seismic resilience and prolongs lifespan.
- High-Rise Buildings – Reduces wind-induced swaying and earthquake vibrations.
- Industrial & Energy Infrastructure – Provides vibration control in dynamic environments.
- Railway & Metro Systems – Ensures operational safety during seismic events.
OVM Permanent Magnet Adjustable Magnetorheological Damper
OVM Permanent Magnet Adjustable Magnetorheological Dampers (MR Dampers) are high-performance adaptive damping systems designed for precise vibration control in high-frequency, small-displacement structures, such as bridge cables. These dampers utilize magnetorheological (MR) fluids, which change viscosity in response to a magnetic field, allowing for real-time damping force adjustments.
By integrating permanent magnets for stable and consistent regulation, OVM MR Dampers ensure high efficiency, reliability, and durability, even in extreme environmental conditions.
Working Principle
OVM MR Dampers consist of:
🔹 Connecting Earring & Attached Cylinder – Provides structural connection and housing.
🔹 Piston & Inner Tube – Regulates fluid movement and damping force.
🔹 Magnetorheological Fluid (MR Fluid) – A smart fluid that alters viscosity under a magnetic field.
🔹 Permanent Magnets – Generates a stable magnetic field for precise force control.
🔹 Sealing Device – Ensures leak-proof and long-lasting performance.
As the structure vibrates, relative motion between the piston and inner tube causes the MR fluid to flow through the damping chamber. The permanent magnet modifies the magnetic field intensity, thereby adjusting the fluid viscosity and controlling the damping force dynamically.
Key Features & Advantages
- Adaptive Damping Technology
Utilizing magnetorheological fluids, OVM MR Dampers provide real-time, adjustable damping forces for precise vibration control. - Stable & Reliable Across Extreme Temperatures
Designed to function efficiently in temperatures ranging from -45°C to 150°C, ensuring consistent performance in diverse environments. - Ideal for High-Frequency, Small-Displacement Applications
Optimized for bridge cable vibration suppression, enhancing structural stability and longevity. - Long Service Life & Minimal Maintenance
Engineered with durable materials and an advanced sealing system, ensuring low maintenance and long-term reliability. - Energy-Efficient & Cost-Effective
With permanent magnets enabling passive regulation, the system minimizes external energy consumption while maintaining high damping efficiency.
Applications
- Bridge Cable Damping Systems – Reduces wind- and traffic-induced vibrations in stay cables.
- High-Speed Railway & Metro Infrastructure – Enhances stability and minimizes dynamic oscillations.
- Industrial Machinery & Equipment – Improves precision and longevity by controlling unwanted vibrations.
Eddy Current Tuned Mass Damper
The OVM Eddy Current Tuned Mass Damper (ECD-TMD) is an advanced passive vibration control system designed to mitigate structural vibrations caused by wind, seismic activity, and other external excitations. Unlike conventional dampers that use fluid viscous damping, OVM ECD-TMD integrates eddy current damping technology, providing highly efficient energy dissipation with no additional stiffness or mechanical wear.
Developed in collaboration with Hunan University, this cutting-edge technology ensures stable, maintenance-free damping performance for various structures, including high-rise buildings, bridges, and long-span structures.
Working Principle
The OVM Eddy Current Tuned Mass Damper consists of:
🔹 Mass Block – Absorbs and counteracts external forces acting on the main structure.
🔹 Elastic Element – Provides necessary flexibility for controlled oscillation.
🔹 Eddy Current Damping Element – Generates a damping force using electromagnetic induction, eliminating the need for traditional viscous damping fluids.
When the structure undergoes vibrations, the mass block moves in opposition to the primary structural motion, generating counteracting forces that effectively reduce the amplitude of structural oscillations. Eddy current damping occurs as the movement of the mass block interacts with a magnetic field, producing resistance that dissipates vibration energy efficiently.
Key Features & Advantages
- Highly Efficient Eddy Current Damping
Unlike conventional fluid dampers, OVM ECD-TMD offers ideal linear viscous damping with precise and stable damping coefficients. - Zero Mechanical Wear & Maintenance-Free
With no contact between moving components, eddy current damping eliminates mechanical wear, ensuring long-term durability and reliability. - No Additional Stiffness
The system does not introduce extra rigidity to the structure, maintaining the original structural dynamic properties without altering its natural period. - Enhanced Structural Stability & Longevity
By minimizing vibration-induced fatigue, the OVM ECD-TMD enhances the lifespan and safety of critical structures. - Cost-Effective & Sustainable
With no reliance on hydraulic fluids or other consumables, the OVM Eddy Current Tuned Mass Damper offers a long-lasting, eco-friendly solution for structural vibration mitigation.
Applications
- High-Rise Buildings & Towers – Reduces sway caused by wind loads.
- Bridges & Viaducts – Enhances durability by counteracting vibration-induced stresses.
- Long-Span Structures – Protects stadiums, airports, and large industrial buildings from excessive oscillations.
- Railway & Metro Infrastructure – Ensures passenger comfort and system stability.
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