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Related Concept Videos

Fault Types01:18

Fault Types

57
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
57
Machines01:19

Machines

219
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
219
Simplification of a Force and Couple System: II01:23

Simplification of a Force and Couple System: II

239
In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
239
Directional Relays01:25

Directional Relays

73
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
73

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Fault Types and Diagnostic Methods of Manipulator Robots: A Review.

Yuepeng Zhang1,2, Jun Wu1,2, Bo Gao1,2

  • 1School of Sino-German Robotics, Shenzhen Institute of Information Technology, Shenzhen 518172, China.

Sensors (Basel, Switzerland)
|April 28, 2025
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Summary

This review comprehensively summarizes fault diagnosis methods for manipulator robots, moving beyond single-fault analyses. It highlights advancements like artificial intelligence and digital twins, crucial for intelligent manufacturing.

Keywords:
fault diagnosismanipulator robotsignal acquisitiontype of fault

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Area of Science:

  • Robotics and Automation
  • Intelligent Manufacturing Systems
  • Fault Diagnosis and Prognostics

Background:

  • Manipulator robots are critical for intelligent manufacturing and industrial transformation.
  • Effective fault diagnosis is increasingly vital for manufacturers and users.
  • Existing reviews often lack a comprehensive overview of diverse fault diagnosis methods.

Purpose of the Study:

  • To provide a comprehensive review of various fault types and diagnostic methods for manipulator robots.
  • To offer a clearer understanding for new researchers and avoid duplicated efforts.
  • To identify future research opportunities and challenges in manipulator robot fault diagnosis.

Main Methods:

  • Analysis of sensor data including voltage, current, speed, torque, vibration, temperature, and sound.
  • Exploration of fault characteristics from a frequency perspective.
  • Review of emerging technologies such as expert systems, artificial intelligence, and digital twins.

Main Results:

  • Identified a gap in comprehensive reviews covering multiple fault types in manipulator robots.
  • Detailed various signal processing techniques and advanced diagnostic methodologies.
  • Highlighted the shift from human-intervened diagnosis to automated and intelligent approaches.

Conclusions:

  • A holistic review of manipulator robot fault diagnosis is essential for advancing the field.
  • Emerging technologies offer significant potential to enhance diagnostic effectiveness and practicality.
  • This review serves as a guide for researchers to focus on critical challenges and opportunities.