Inertia Measurement Module With Nested Vibration Damping
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Solution Overview
Problem
Conventional inertia measurement modules for unmanned aircraft have bulky volumes and poor buffering effects due to externally disposed vibration-attenuation cushions, which increase the aircraft's weight and risk of damage, compromising the module's service life and measurement stability.
Innovation Solution
An inertia measurement module with a housing assembly containing a sensing assembly and a vibration damper, where the vibration damper includes a first and second vibration-attenuation cushion bonded to the circuit boards and housing, reducing the module's volume and weight while enhancing vibration attenuation, specifically attenuating vibrations above 50 Hz to below 30% of their original intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration-attenuation cushions are disposed outside the housing assembly, then the buffering effect is improved, but the volume and weight of the control module are increased
Solution Approach 1:
The vibration-attenuation cushions are integrated inside the housing assembly, with the first cushion positioned between the circuit board and housing bottom wall, and the second cushion between the circuit board and housing side wall. This nested configuration provides buffering protection while maintaining a compact structure that reduces overall module weight compared to external cushion arrangements.
2Reliability
If vibration-attenuation cushions are disposed outside the housing assembly, then the buffering effect is improved, but the service life is reduced due to exposure damage
Solution Approach 1:
The vibration-attenuation cushions are nested within the protected interior space of the housing assembly, shielded from external environmental factors. The first cushion is positioned between the circuit board and the housing bottom wall, while the second cushion is positioned between the circuit board and the housing side wall, ensuring both cushions remain protected during operation and extend service life.
3Volume of moving object
If the module volume is reduced by integrating cushions inside, then the loading space is increased, but the buffering effect may be compromised
Solution Approach 1:
The vibration-attenuation cushions are strategically positioned at critical interfaces where vibration isolation is most needed. The first cushion is positioned between the circuit board and the housing bottom wall to attenuate vertical vibrations, while the second cushion is positioned between the circuit board and the housing side wall to attenuate lateral vibrations. This localized placement ensures effective buffering with minimal space consumption, maintaining compact module volume while preserving buffering effectiveness.
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
The solution significantly reduces the operational vibration frequency's influence on the inertia sensor, improving measurement stability and extending the module's service life while minimizing the module's size and weight, thus increasing the aircraft's loading space.
Implementation Method 1
a first vibration-attenuation cushion for buffering vibrations
Implementation Method 2
The second circuit board, the weight block, the first vibration-attenuation cushion and the first circuit board are bonded together in sequence into one piece
Data Source
AI summary
An unmanned aircraft includes a circuit board with an inertia sensor, and a weight block configured to have a flat surface and a recess formed on the flat surface, and a housing assembly configured to form an inner chamber to accommodate the circuit board and the weight block. The circuit board is embedded in the recess by fixedly bonding to the flat surface through adhesion.