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Optimal Design and Analysis on High Overload Buffer Structure of Passive Semi-Strapdown Inertial Navigation System
Jinqiang Li1, Jie Li1,2, Li Qin1,2
1National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China.
Sensors (Basel, Switzerland)
|February 26, 2020
Summary
This study introduces an optimized buffer structure for inertial navigation systems, enhancing protection against high overloads and improving stability during high-speed rotations. The novel design significantly reduces deformation and eliminates friction interference.
Area of Science:
- Mechanical Engineering
- Aerospace Engineering
- Inertial Navigation Systems
Background:
- Passive semi-strapdown inertial navigation systems require isolation platforms to reduce sensor measurement ranges for improved accuracy.
- Existing internal bearings in isolation platforms face challenges withstanding high overloads during projectile rotation.
- High overload conditions can compromise the stability and accuracy of inertial navigation systems.
Purpose of the Study:
- To propose an optimal design for a high overload buffer structure for isolation rolling platforms.
- To address the limitations of internal bearings in high overload scenarios within inertial navigation systems.
- To enhance the stability and accuracy of isolation rolling platforms under extreme conditions.
Main Methods:
- Design of a point contact spherical cap buffer structure.
- Material selection for spherical caps to minimize deformation and friction.
- Integration of a spring mechanism for post-impact separation of spherical caps.
- Finite element analysis and ground semi-physical simulation experiments for validation.
Main Results:
- The optimized point contact spherical cap structure reduced maximum deformation radius by 40.8%.
- Post-impact separation of spherical caps eliminated pivoting friction torque, improving platform stability.
- The isolation rolling platform's anti-high-speed rotation capability increased by 52% at 10 r/s main shaft rotation.
- Demonstrated effective protection against high overload and enhanced anti-rotation capabilities.
Conclusions:
- The proposed point contact spherical cap buffer structure is effective in protecting against high overloads.
- The design enhances the stability and performance of isolation rolling platforms in inertial navigation systems.
- The method offers significant engineering value for applications requiring high-precision navigation under dynamic loads.
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