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Magneto-Rheological
Magneto-Rheological

LORD Magneto-Rheological (MR)

Custom Solutions

As the leader in the development and supply of MR technology, we have the expertise to partner with you in the design, development, testing and manufacture of our optimal MR technology for your application. If you don't see a product or technology example on our site that suits your needs, it means we haven’t partnered with you yet. We’ll help you evaluate if our MR technology is right for your needs...Ask Us How.

SEISMIC PROTECTION

Civil and structural engineers are protecting buildings and their occupants with our MR technology. LORD MR fluid devices enlarge the control envelope of base-isolation and distributed-damping systems that protect against earthquakes against both initial shocks and aftershocks.

High Dissipative Force at Low Velocity:
Unlike with variable orifice dampers, force is not wholly dependent upon velocity, enabling superior mitigation of a broader range of seismic activity. This capability is especially important in mitigating aftershocks, which can be even more damaging than the initial shock.

Continual Optimization:
Unlike passive systems that are tuned once according to an inferred optimum setting, our MR devices continually optimize the rheology (stiffness) of their fluid up to 100 Hz. Further, this controllable re-tuning occurs more quickly with MR than with alternative semi-active solutions.

High Dynamic Range:
The ratio of the maximum force to the minimum force that our MR devices provide is much greater than that of any other controllable damper, particularly at low velocities. Unlike friction dampers, MR dampers experience comparatively very low levels of stiction.

Inherent Stability and Failure-safety:
Unlike active dampers that require large power sources, our semi-active MR dampers fail-safe to a passive damping mode.

Mechanical Simplicity:
Our MR damper valves have no moving parts, reducing maintenance concerns and potential expense.

Fast Response Time:
Because our MR damper valves have no moving parts, their response time is significantly faster than that of variable-orifice dampers.

Small Device Size:
MR technology enables smaller device sizes than with hydraulic or mechanical systems, leading to aesthetic and practical benefits.

Large Temperature Range:
Importantly, our MR materials can operate under the extreme conditions often associated with catastrophic events; our MR dampers have an operating temperature range of -40° C to 130° C, with no significant variation in performance.

CABLE-STAYED BRIDGES

Civil and architectural engineers are protecting bridges and their occupants with our MR technology. LORD MR fluid dampers attached to cables provide a continuously controllable, cost-effective solution to wind-rain-induced cable "gallop." Although stay cables are prone to vibration due to effects of wind and rain, MR dampers have the potential efficiency several times that of standard oil dampers.

High Dissipative Force at Low Velocity:
Unlike with variable orifice dampers, force is not wholly dependent upon velocity, enabling superior mitigation of a broader range of vibration.

Continual Optimization:
Unlike passive systems that are tuned once according to an inferred optimum setting, our MR devices – continually optimize the rheology (stiffness) of their fluid up to 100 Hz. Further, this controllable re-tuning occurs more quickly with MR than with alternative semi-active solutions.

High Dynamic Range:
The ratio of the maximum force to the minimum force that our MR devices provide is much greater than that of any other controllable damper, particularly at low velocities. Unlike friction dampers, our MR dampers experience comparatively very low levels of stiction.

Inherent Stability and Failure Safety:
Unlike active dampers that require large power sources, our semi-active MR dampers fail-safe to a passive damping mode.

Mechanical Simplicity:
Our MR damper valves have no moving parts, reducing maintenance concerns and potential expense.

Fast Response-time:
Because our MR damper valves have no moving parts, their response time is significantly faster than that of variable-orifice dampers.

Small Device Size:
Our MR technology enables smaller device sizes than with hydraulic or mechanical systems, leading to aesthetic and practical benefits.

Large Temperature Range:
Importantly, our MR materials can operate under the extreme conditions often associated with catastrophic events; our MR dampers have an operating temperature range of -40° C to 130° C, with no significant variation in performance.

MEDICAL

Collaborating with our design engineers, Biedermann Motech, a German manufacturer of prosthetic components, developed a device that improves the mobility of above-the-knee leg amputees. The Prolite™ Smart Magnetix™ Above-the-Knee (AK) Prosthetic, increases gait balance, stability and energy efficiency using controllable MR technology adapted from LORD Motion Master™ Ride Management System truck seat damper.

Highly Precise and Nearly Instantaneous Control:
The responsiveness of LORD MR fluid is under 10 milliseconds, and its resistive force can be almost infinitely varied over a range. This controlled variability in force makes this product possible.

Velocity-independent Force:
Our MR technology can accurately emulate natural movement and resistance even in very slow movements.

Superior Dependability and Cost to Active Damper Devices:
Unlike devices using active dampers, Our MR technology does not add potentially destabilizing force to the system; it merely provides resistive force. Further, it provides natural performance at less cost than active-damper devices.

CLUTCH

LORD MR fluid can provide smooth, efficient torque-transfer in clutch devices. Many current clutch solutions have limitations, such as a lack of controllability or high off-state drag. However, our MR clutches can overcome these limitations, and is well suited for a wide range of applications including fan clutches and small driveline clutches.

Simplicity of Design and Manufacture:
Unlike mechanical solutions, our MR technology accommodates simple device designs with few moving parts, leading to lower total cost.

Soft-start Capability and Smooth Power Transfer:
The near-infinite variability of our MR fluid within a range enables MR-based clutches to engage and disengage smoothly and gradually.

Minimal Package Size:
LORD MR fluid provides higher dissipative energy density than any other controllable material technology. This characteristic enables the clutch device to be smaller than conventional technology would accommodate.

Low Power Consumption:
Because of LORD MR fluid's high energy density, clutches can consume less energy than with conventional mechanical technology

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