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Rheological Devices

CSA Engineering offers design and development services, and prototype and small quantity fabrication, of magnetorheological (MR) and electrorheological (ER) devices. The unique feature offered by these ‘smart’ fluids is the ability to instantly vary viscosity by controlling electrical current or voltage.

What does this mean? Viscous devices (shock absorbers, hydraulic dampers, clutches, etc.) depend on the viscosity of the fluid to absorb motion energy. The ability to rapidly vary this viscosity allows nearly instantaneous control over the amount energy being absorbed. This is an extremely simple and cost effective means for:

  • Active Suspension
  • Variable Torque Transfer
  • Controllable Damping
  • Frictionless Braking

Magnetic fields are modeled to optimize device performance, power needs, and materials

A fast-responding MR fluid shock absorber

Why choose CSA Engineering? CSA possesses the necessary tools, equipment and engineering skills to offer a complete active or passive rheological solution. While the operation of a rheological device is fundamentally simple, correct implementation is very complex. Most customers have weight, power, form-factor, durability, accessibility and other constraints that drive design. Effective, fast and responsive control of the device is as important as the physical device design. The internal field must be sufficient in density and strength while meeting time response requirements. CSA Engineering integrates these capabilities into rheological device design:

  • Proven controls algorithms
  • Embedded control based on microcontrollers or DSPs
  • Device design, fabrication and rapid prototyping
  • Magnetic field analysis and design optimization
  • Full testing and characterization facilities

Some organizations have a familiarity with rheological fluids. Others have experience in device design and development. CSA brings together all the necessary tools to create rheological fluid devices that meet the most demanding requirements.

CSA utilizes established backgrounds in magnetic design, damping, control systems, valve design, and passive/active systems in the development of MR or ER fluid devices. This experience set ensures a design is optimal for its application. Regardless of the size or type of application, CSA can develop rheological fluid devices that make full use of the beneficial characteristics of the controllable fluid.

Contact eric.anderson@csaengineering.com to discuss CSA's capabilities and your requirements.