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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
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Electro-mechanical Systems01:19

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
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Open and closed-loop control systems01:17

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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
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Control Systems: Applications01:25

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Electrical engineering plays a pivotal role in our daily lives, with control systems at the heart of many applications, from home appliances to sophisticated space shuttles. Control systems manage and regulate the behavior of devices and processes, ensuring they function safely, correctly, and efficiently.
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Updated: Jul 20, 2025

Four-Dimensional Printing of Stimuli-Responsive Hydrogel-Based Soft Robots
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A multifunctional soft robotic shape display with high-speed actuation, sensing, and control.

B K Johnson1, M Naris1, V Sundaram1

  • 1Paul M. Rady Mechanical Engineering, University of Colorado Boulder, Boulder, CO, USA.

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|July 31, 2023
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Researchers developed a novel soft shape display using electrohydraulic actuators and magnetic sensors. This high-speed, multifunctional display enables advanced applications in robotics, haptics, and beyond.

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Area of Science:

  • Robotics
  • Materials Science
  • Human-Computer Interaction

Background:

  • Existing shape displays in robotics often struggle with high-fidelity morphing, rapid deformation, and integrated sensing capabilities.
  • These limitations hinder their application in fields like haptics, manufacturing, and aerodynamics.

Purpose of the Study:

  • To develop a multifunctional soft shape display with enhanced performance characteristics.
  • To address the limitations of current shape-morphing technologies through integrated actuation and sensing.

Main Methods:

  • A 10x10 array of scalable cellular units was engineered, integrating high-speed electrohydraulic soft actuation and magnetic-based sensing.
  • Control circuitry was embedded within the cellular units for coordinated operation.
  • The system was designed for high-performance, reversible shape morphing and sensitive state detection.

Main Results:

  • Demonstrated high-performance reversible shape morphing at frequencies up to 50 Hz.
  • Achieved high-sensitivity sensing of surface deformations (0.1 mm) and external forces (50 mN) per cell.
  • Showcased diverse applications including user interaction, image display, object mass sensing, and dynamic manipulation of solids and liquids.

Conclusions:

  • The developed soft shape display offers rich multifunctionality and high-performance capabilities.
  • Tightly integrating electrohydraulic actuators, soft sensors, and controllers at scale is key to advancing soft robotics.
  • This technology opens new avenues for interactive surfaces, advanced robotics, and novel sensing applications.