Micro Inertial Measurement System Vibration Damping
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Solution Overview
Problem
The traditional inertial measurement system for strapdown navigation is prone to torsional vibrations and has a narrow damping frequency band, leading to instability and reduced precision, particularly in miniaturized carriers like UAVs, due to uneven rigidity and irrational mechanical structure.
Innovation Solution
A micro inertial measurement system with a rigid cube-shaped sensing support and flexible circuit boards, integrated with a damping unit composed of multiple damping units between the sensing module and the housing, providing equal-rigidity vibration reduction and improved mechanical structure to decouple vibrations in three dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional inertial measurement system uses conventional mechanical structure, then it can be easily manufactured, but it produces torsional vibrations and has narrow damping frequency band
Solution Approach 1:
The system divides the sensing module into independent components mounted on a rigid support structure. The sensing module includes separate gyroscope and accelerometer units, each with dedicated mounting positions, allowing independent optimization of each sensor's mechanical environment and damping characteristics.
Solution Approach 2:
The sensing module is nested within a housing structure that provides multiple levels of damping. The rigid sensing support is positioned within the housing with damping units arranged between the sensing module and housing walls, creating a nested configuration where inner components are protected by outer damping structures.
2Reliability
If the sensing support uses uneven rigidity structure, then it simplifies manufacturing, but it causes torsional vibrations and reduces damping effectiveness
Solution Approach 1:
The rigid sensing support features locally optimized mounting positions with enhanced rigidity at specific locations where sensors are mounted. The support structure has varying thickness and reinforcement at different areas, providing high rigidity where needed for sensor stability while maintaining overall manufacturability through standardized fabrication processes.
3Volume of moving object
If the inertial measurement system is miniaturized for UAV carriers, then it reduces volume and weight, but it increases susceptibility to vibration and impact
Solution Approach 1:
The damping approach transitions from traditional external damping structures to internal damping units positioned in the gaps between the sensing module and housing walls. This three-dimensional arrangement of damping units provides comprehensive vibration protection within the compact form factor, utilizing the available space in all directions rather than adding external damping components.
4Ease of manufacture
If damping units are placed outside the sensing module, then it simplifies assembly, but it increases system volume and reduces damping efficiency
Solution Approach 1:
The damping units are nested within the housing structure, positioned in the gaps between the sensing module and housing walls. This nested configuration integrates damping functionality into the existing system volume without requiring additional external space, while maintaining simple assembly through the modular housing design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances noise immunity, reduces relative amplitude of the mounting surface, and minimizes resonance excitation, resulting in improved stability and precision of the inertial measurement system while reducing its volume and weight.
Implementation Method 1
the damper is received in the housing and set in the gap between the sensing module and an inside wall of the housing
Data Source
AI summary
A micro inertial measurement system includes a housing, a sensing module, and a damper. The sensing module includes a rigid sensing support, a measuring and controlling circuit board mounted on the rigid sensing support and an inertial sensor set on the measuring and controlling circuit board. The inertial sensor includes a gyroscope and an accelerometer. The sensing module is mounted in the housing. The damper is mounted in the housing and set in the gap between the sensing module and the inside wall of the housing. By use of the above-mentioned structure, the noise immunity of the inertial measuring system can be greatly improved, and the volume and weight of the inertial measuring system can be greatly reduced.