Rotation-rate Sensor Spring System Non-linearity Reduction
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Solution Overview
Problem
Existing rotation-rate sensors with double-folded beam suspensions (DFBS) exhibit substantial deviations from a linear restoring force, leading to detrimental effects on sensor behavior due to increased non-linearity and parasitic mode excitability.
Innovation Solution
A rotation-rate sensor with a spring system configured by connecting bars between edge bars, featuring an opening angle between 1° and 89°, reduces the mass and weight of the intermediate piece, thereby minimizing inertia forces and dynamic non-linearity, and enhancing mechanical stability through a latticework structure with positive and negative gradients and intersecting connecting bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional double-folded beam suspensions (DFBS) are used to connect drive structures to substrate, then mechanical stability is maintained, but substantial deviations from linear restoring force occur and non-linearity increases
Solution Approach 1:
The spring structure is segmented into multiple discrete bars (first bar, second bar, third bar, fourth bar) connected in series, replacing the traditional folded beam configuration. This segmentation allows each bar to contribute to the overall spring constant while maintaining linearity, resolving the contradiction between stability and linearity.
Solution Approach 2:
Each bar in the spring structure is designed with specific local properties (length, width, thickness, material composition) that can be independently optimized. This local quality control enables precise tuning of the restoring force characteristics to achieve linearity while maintaining overall mechanical stability.
2Weight of moving object
If intermediate piece mass is reduced to minimize inertia forces, then non-linearity decreases, but mechanical stability may be compromised
Solution Approach 1:
The spring structure employs composite material design where multiple bars with different geometric properties work together. This composite approach allows the intermediate piece to achieve low mass through optimized material distribution while maintaining mechanical stability through the collective strength of all bars working in unison.
Solution Approach 2:
The spring structure is pre-configured with specific bar orientations and connections before operation. This preliminary design ensures that when mass is reduced, the remaining structure maintains optimal stress distribution and mechanical stability without requiring additional mass.
3Weight of stationary object
If opening angle of connecting bars is optimized to reduce mass, then weight decreases, but structural integrity may be affected
Solution Approach 1:
The opening angles of the connecting bars are precisely controlled within the range of 1° to 89° during manufacturing. This parameter optimization allows the spring structure to achieve minimum weight while maintaining sufficient structural integrity, as the specific angle range balances mass reduction with stress distribution requirements.
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 configuration achieves high stability, reduces non-linearity, and decreases parasitic mode excitability, resulting in improved sensor behavior and a 30% mass reduction of the intermediate piece, with simulated non-linearity reduction by 11% compared to traditional DFBS.
Implementation Method 1
the spring structures/spring systems resilient connect the drive structures (respectively, drive frames) of the rotation-rate sensor to the substrate
Data Source
AI summary
A rotation-rate sensor having a substrate, the rotation-rate sensor having a drive structure that is movable in relation to the substrate, the drive structure being attached to the substrate by a spring system, the spring system having a first spring component that connects the drive structure and the substrate, and a second spring component that connects the drive structure and the substrate, the first spring component and the second spring component being connected by an intermediate piece, wherein the intermediate piece includes a first edge bar and a second edge bar, a group of connecting bars being configured between the first and second edge bar, the connecting bars of the group of connecting bars each being disposed at an opening angle of between 1° and 89° on the first and/or second edge bar.