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  • 1
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    Workspace Safe Operation of a Force- or Impedance-Controlled Robot (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-24
    Description: A method of controlling a robotic manipulator of a force- or impedance-controlled robot within an unstructured workspace includes imposing a saturation limit on a static force applied by the manipulator to its surrounding environment, and may include determining a contact force between the manipulator and an object in the unstructured workspace, and executing a dynamic reflex when the contact force exceeds a threshold to thereby alleviate an inertial impulse not addressed by the saturation limited static force. The method may include calculating a required reflex torque to be imparted by a joint actuator to a robotic joint. A robotic system includes a robotic manipulator having an unstructured workspace and a controller that is electrically connected to the manipulator, and which controls the manipulator using force- or impedance-based commands. The controller, which is also disclosed herein, automatically imposes the saturation limit and may execute the dynamic reflex noted above.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Embedded diagnostic, prognostic, and health management system and method for a humanoid robot (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A robotic system includes a humanoid robot with multiple compliant joints, each moveable using one or more of the actuators, and having sensors for measuring control and feedback data. A distributed controller controls the joints and other integrated system components over multiple high-speed communication networks. Diagnostic, prognostic, and health management (DPHM) modules are embedded within the robot at the various control levels. Each DPHM module measures, controls, and records DPHM data for the respective control level/connected device in a location that is accessible over the networks or via an external device. A method of controlling the robot includes embedding a plurality of the DPHM modules within multiple control levels of the distributed controller, using the DPHM modules to measure DPHM data within each of the control levels, and recording the DPHM data in a location that is accessible over at least one of the high-speed communication networks.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Framework and Method for Controlling a Robotic System Using a Distributed Computer Network (2015)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A robotic system for performing an autonomous task includes a humanoid robot having a plurality of compliant robotic joints, actuators, and other integrated system devices that are controllable in response to control data from various control points, and having sensors for measuring feedback data at the control points. The system includes a multi-level distributed control framework (DCF) for controlling the integrated system components over multiple high-speed communication networks. The DCF has a plurality of first controllers each embedded in a respective one of the integrated system components, e.g., the robotic joints, a second controller coordinating the components via the first controllers, and a third controller for transmitting a signal commanding performance of the autonomous task to the second controller. The DCF virtually centralizes all of the control data and the feedback data in a single location to facilitate control of the robot across the multiple communication networks.
    Keywords: Computer Systems; Cybernetics, Artificial Intelligence and Robotics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Communication System and Method (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A communication system for communicating over high-latency, low bandwidth networks includes a communications processor configured to receive a collection of data from a local system, and a transceiver in communication with the communications processor. The transceiver is configured to transmit and receive data over a network according to a plurality of communication parameters. The communications processor is configured to divide the collection of data into a plurality of data streams; assign a priority level to each of the respective data streams, where the priority level reflects the criticality of the respective data stream; and modify a communication parameter of at least one of the plurality of data streams according to the priority of the at least one data stream.
    Keywords: Communications and Radar; Cybernetics, Artificial Intelligence and Robotics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Robust Operation of Tendon-Driven Robot Fingers Using Force and Position-Based Control Laws (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A robotic system includes a tendon-driven finger and a control system. The system controls the finger via a force-based control law when a tension sensor is available, and via a position-based control law when a sensor is not available. Multiple tendons may each have a corresponding sensor. The system selectively injects a compliance value into the position-based control law when only some sensors are available. A control system includes a host machine and a non-transitory computer-readable medium having a control process, which is executed by the host machine to control the finger via the force- or position-based control law. A method for controlling the finger includes determining the availability of a tension sensor(s), and selectively controlling the finger, using the control system, via the force or position-based control law. The position control law allows the control system to resist disturbances while nominally maintaining the initial state of internal tendon tensions.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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