A Novel Method for the Micro-Clearance Measurement of a Precision Spherical Joint Based on a Spherical Differential
Wen Wang1, He Yang2, Min Zhang3
1School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China. wangwn@hdu.edu.cn.
Sensors (Basel, Switzerland)
|October 12, 2018
Summary
This study introduces a novel spherical differential capacitive sensor (SDCS) for precise micro-clearance measurement in spherical joints. The method accurately detects small eccentric displacements, enhancing mechanical system analysis and transmission accuracy.
Area of Science:
- Mechanical Engineering
- Sensor Technology
- Metrology
Background:
- Spherical joints are crucial components in robotics and automotive systems, requiring precise clearance detection for accurate motion analysis.
- Real-time monitoring of spherical joint clearance is vital for improving mechanical system performance and transmission accuracy.
Purpose of the Study:
- To present a novel method for micro-clearance measurement in precision spherical joints using a spherical differential capacitive sensor (SDCS).
- To establish a mathematical model for spatial eccentric displacements and differential capacitance.
- To validate the feasibility and effectiveness of the SDCS method through simulation.
Main Methods:
- Designed spherical capacitive plates based on spacing variation principles.
- Developed a mathematical model linking spatial eccentric displacements to differential capacitance.
- Incorporated equipotential guard rings to mitigate fringe effects and enhance measurement accuracy.
- Utilized Ansoft Maxwell software for simulating capacitance variations with eccentric displacements.
Main Results:
- The proposed spherical differential capacitive sensor (SDCS) method is feasible for micro-clearance measurement.
- Simulation results confirm the effectiveness of the SDCS for detecting small eccentric displacements in spherical joints.
- The design effectively attenuates fringe effects, improving measurement precision.
Conclusions:
- The novel SDCS provides an effective solution for real-time micro-clearance measurement in precision spherical joints.
- This technology can significantly contribute to the error analysis and accuracy improvement of mechanical systems.
- The validated method offers a promising approach for advanced metrology in industrial robotics and automotive applications.
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