Electrostatic Resonator Damping With Selective Parasitic Mode Control
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Solution Overview
Problem
Existing solutions for damping parasitic vibration modes in resonant electromechanical sensors are non-selective, require additional materials that degrade sensor performance, and increase manufacturing costs, while also affecting useful modes and being complex to implement.
Innovation Solution
An electrostatic damping device using a bias circuit with an electronic impedance compensator, comprising capacitance, resistance, and optionally inductance components, to selectively damp parasitic vibration modes without adding solid materials and without requiring a hermetic enclosure, allowing for reversible operation and compensation of parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric damping is used to damp parasitic modes, then damping effectiveness is improved, but device complexity and manufacturing cost increase due to additional material deposits and electrodes
Solution Approach 1:
The patent replaces the mechanical piezoelectric damping system with an electrostatic damping system that uses electrical fields and electronic circuits. Instead of using piezoelectric material deposits and electrodes on the vibrating structure, the invention uses a control electrode and electronic impedance network to achieve damping through electrical means, thereby simplifying the mechanical architecture.
Solution Approach 2:
The patent introduces an electronic impedance network as an intermediary between the control electrode and ground. This electronic intermediary provides the damping effect through impedance matching and energy dissipation in the electrical domain, avoiding the need for complex mechanical piezoelectric structures.
2Reliability
If gaseous damping is used to damp parasitic modes, then damping effectiveness is improved, but device complexity and manufacturing cost increase due to hermetic enclosure requirements
Solution Approach 1:
The patent replaces the gaseous damping system with an electrostatic damping system. Instead of using gas molecules to provide viscous damping, the invention uses electrical fields and electronic circuits to achieve the same damping effect, eliminating the need for hermetic enclosures and gas management systems.
3Reliability
If material deposits are added to damp parasitic modes, then damping effectiveness is improved, but sensor performance degrades due to added mass and mechanical properties changes
Solution Approach 1:
The patent replaces mechanical damping materials with an electrostatic damping system that acts through electrical fields. This allows damping to be achieved without adding physical mass or altering the mechanical properties of the vibrating structure, thereby preserving sensor performance while effectively damping parasitic modes.
4Reliability
If non-selective damping is applied to all vibration modes, then parasitic modes are damped, but useful modes are also affected reducing sensor performance
Solution Approach 1:
The patent applies damping selectively to specific vibration modes by using mode-selective actuation through the control electrode. By exciting specific modes and applying damping only to those modes, the useful modes remain unaffected while parasitic modes are effectively damped, maintaining sensor performance.
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 provides selective damping of parasitic modes within a specific frequency band, avoids material degradation, reduces manufacturing costs, and allows for preventive compensation of sensor damage, enhancing sensor performance and operational flexibility.
Implementation Method 1
an electrode forming with the mobile an air gap of biased capacitance under a DC voltage
Implementation Method 2
an electrode forming with the mobile an air gap of biased capacitance under a DC voltage
Implementation Method 3
the bias circuit further comprises an electronic impedance compensator device, which comprises a capacitance component and a resistance component, and optionally an inductance component
Implementation Method 4
device for electrostatic damping of a vibration movement of a mobile
Implementation Method 5
a load resistor
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
Electrostatic device for damping a mechanical vibration movement of a moving object, the moving object being made of an electrically conductive material, the movement of the moving object having at least one parasitic vibration mode of frequency fp to be damped, the device comprising an electrode ELE forming, with the moving object, a gap of capacitance C voltage-biased with a DC voltage V0 by a biasing circuit, the biasing circuit comprising, electrically connected in series with the electrode ELE: a load resistor R; optionally, an inductor L; and a parasitic capacitance Cp, characterized in that the biasing circuit further includes an electronic compensating device DEC having an impedance Zeq, which comprises a capacitance component Ceq, a resistance component Req, and possibly an inductance component Leq.