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Robot Position Sensor Fault Tolerance

Robot Position Sensor Fault Tolerance

          
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About the Book

Robot systems in critical applications, such as those in space and nuclear environments, must be able to operate during component failure to complete important tasks. One failure mode that has received little attention is the failure of joint position sensors. Current fault tolerant designs require the addition of directly redundant position sensors which can affect joint design. A new method is proposed that utilizes analytical redundancy to allow for continued operation during joint position sensor failure. Joint torque sensors are used with a virtual passive torque controller to make the robot joint stable without position feedback and improve position tracking performance in the presence of unknown link dynamics and end-effector loading. Two Cartesian accelerometer based methods are proposed to determine the position of the joint. The joint specific position determination method utilizes two triaxial accelerometers attached to the link driven by the joint with the failed position sensor. The joint specific method is not computationally complex and the position error is bounded. The system wide position determination method utilizes accelerometers distributed on different robot links and the end-effector to determine the position of sets of multiple joints. The system wide method requires fewer accelerometers than the joint specific method to make all joint position sensors fault tolerant but is more computationally complex and has lower convergence properties. Experiments were conducted on a laboratory manipulator. Both position determination methods were shown to track the actual position satisfactorily. A controller using the position determination methods and the virtual passive torque controller was able to servo the joints to a desired position during position sensor failure. Aldridge, Hal A. Langley Research Center FAULT TOLERANCE; ROBOT CONTROL; TORQUE SENSORS (ROBOTICS); ACCELEROMETERS; POSITION SENSING; ROBOTICS; FEEDBACK CONTROL; CONTROL SYSTEMS DESIGN...


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Product Details
  • ISBN-13: 9781790116270
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 178
  • Spine Width: 10 mm
  • Width: 216 mm
  • ISBN-10: 1790116279
  • Publisher Date: 22 Nov 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 426 gr


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