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Damping techniques in MEMS gyroscope factories are
critical for controlling the quality factor (Q-factor), reducing noise, and maintaining stability in vibratory structures
. These techniques focus on managing both gas-based and solid-state energy losses, which are typically addressed through a combination of vacuum packaging, structural optimization, and active electronic control.
Here are the key damping techniques used in the production and design of MEMS gyroscopes:
1. Gas Damping Control (Package-Level Damping)
Gas-related damping is one of the dominant energy losses, especially in low-frequency devices, where the air acts as a viscous fluid.
- Vacuum Packaging: To reduce damping, high-performance MEMS gyroscopes are sealed in a high-vacuum environment (e.g., 100 Pa) to minimize energy dissipation caused by the air film between the vibrating mass and the substrate.
- Squeeze-Film Damping Management: As the proof mass oscillates, the air layer is compressed. Factories utilize vacuum packaging to prevent this, or design the gap between the mass and substrate to optimize for damping.
- Couette Flow Damping Reduction: In devices with parallel movement, viscous effects (Couette flow) are mitigated through package design.
2. Structural Damping Techniques (Design & Fabrication)
These techniques aim to minimize energy loss within the material and structural components themselves.
- Thermoelastic Damping (TED) Mitigation: Real materials expand and contract with temperature, creating heat and energy loss. Factories use materials like silicon, where TED can be modeled and minimized through structural optimization.
- Anchor Loss Reduction: Structural modifications are made to the anchor points (suspensions) of the proof mass to reduce energy dissipation into the substrate.
- Geometry Optimization: Modifications in structural parameters, such as beam width or the size of holes in the proof-mass, are used to tune resonance frequencies and reduce structural damping.
- Out-of-Plane Suspension: Utilizing suspensions normal (perpendicular) to the proof mass helps achieve inertial-grade performance by reducing in-plane damping.
3. Active Damping and Q-Factor Tuning (Electronics)
Active techniques are used to control the damping factor on-chip, particularly when high sensitivity (high Q) is required for the sensing mode, but high damping is needed for the driving mode.
- Resistive Damper (Active Q-Matching): This technique uses on-chip or external resistances (50 kΩ typical) to create electrical damping. A current is induced during vibration, which dissipates energy through heat, thereby regulating the Q-factor in both drive and sense modes.
- Force-Balance/Closed-Loop Control: A closed-loop control system is used to apply a counter-force to the Coriolis force, restricting the motion of the sense mass and improving bandwidth at the cost of reduced displacement.
- Active Damping through Feedback: Distributing piezoelectric actuators along the structure can inject a force, equivalent to a viscous damper, to suppress oscillations and reduce settling time.
4. Material and Process Optimization
- Silicon Micro-machining: Using monocrystalline silicon reduces internal damping.
- Advanced Etching: Precise, high-aspect-ratio, and DRIE (Deep Reactive Ion Etching) are used to create the specific structures required to control damping.
- Mass Trimming/Defect Reduction: Using lasers or other processes to remove small amounts of material to balance the gyroscope, reducing energy losses and non-orthogonal behavior.
These techniques are often applied to ensure that the gyroscope's sensing quality factor (
) is tuned to a precise value in a high-vacuum environment to achieve high sensitivity while limiting noise.
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A New MEMS Gyroscope Used for Single-Channel Damping
National Institutes of Health (NIH) | (.gov)
https://pmc.ncbi.nlm.nih.gov
› articles › PMC4481988
National Institutes of Health (NIH) | (.gov)
https://pmc.ncbi.nlm.nih.gov
› articles › PMC4481988
by Z Zhang
2015
Cited by 6
—
It is
used for the damping of a single-channel control system
of rotating aircraft. It differs from common MEMS gyroscopes in that does not have a drive ...
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The analysis of damping in MEMS gyroscope
Ericco Inertial Technology
https://www.ericcointernational.com
› application › the-...
Ericco Inertial Technology
https://www.ericcointernational.com
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This paper aims to analyze the influence of
damping
on
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, and introduces the concept and function of
damping
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damping
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Use of MEMS Gyroscopes in Active Vibration Damping for ...
Università di Padova
https://automatica.dei.unipd.it
› utenti › iecon2011
Università di Padova
https://automatica.dei.unipd.it
› utenti › iecon2011
PDF
by R Antonello
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In this paper, we propose the extension of the proposed
technique
, with the use of a
MEMS gyroscope
to implement an active
damping
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Design optimization of MEMS gyroscope for enhanced ...
ScienceDirect.com
https://www.sciencedirect.com
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ScienceDirect.com
https://www.sciencedirect.com
› article › abs › pii
by RK Bhan
2025
Cited by 1
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This study addresses the critical challenge of
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, essential for navigation and industrial applications.
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Sound Attenuation Using MEMS Fabricated Acoustic ...
Auburn University
https://etd.auburn.edu
› Yunker_Thesis_Final
Auburn University
https://etd.auburn.edu
› Yunker_Thesis_Final
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2012
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This is because
fluidic damping is minimized in MEMS gyroscopes
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Dynamics and control of a MEMS angle measuring gyroscope
University of California, Berkeley
https://horowitz.me.berkeley.edu
› All_papers_nu...
University of California, Berkeley
https://horowitz.me.berkeley.edu
› All_papers_nu...
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by S Park
2008
Cited by 65
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The developed con- trol algorithm maintains the prescribed total energy level, and compensates for mismatched stiffness and
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An automatic damping-matching method for eliminating ...
Research Square
https://www.researchsquare.com
› article › latest
Research Square
https://www.researchsquare.com
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Introduction. Micro-Electro-Mechanical Systems (
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devices
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