Multi-Frequency Excitation for Wider MEMS Resonance Bandwidth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Micro- and nano-scale devices, such as MEMS and NEMS, face limitations in operating frequencies due to fabrication challenges and sharp resonance responses, which are often narrow and sensitive to noise and thermal variations, leading to reduced amplitude and bandwidth.
Innovation Solution
The implementation of multi-frequency excitation techniques, which involve applying two or more excitation sources with different frequencies to induce combination resonances in micro- and nano-scale devices, allowing for operation at higher, lower, and wider frequency ranges without increasing complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-frequency excitation is used to achieve sharp resonance response, then measurement precision is improved, but operating bandwidth is reduced
Solution Approach 1:
The patent applies periodic excitation at multiple frequencies simultaneously. By using a combination of excitation frequencies (e.g., fundamental frequency and its harmonics), the system creates periodic forcing functions that exploit nonlinear resonance phenomena. This allows the device to achieve sharp response peaks at multiple frequency locations, effectively broadening the operating bandwidth while maintaining measurement precision through selective resonance enhancement.
Solution Approach 2:
The patent changes the excitation frequency parameters by applying multi-frequency excitation instead of single-frequency excitation. By varying the frequency parameters and their combinations, the system can tune the resonance responses to achieve both sharp peaks (for precision) and broad coverage (for bandwidth). The frequency parameters are adjusted to match the nonlinear natural frequencies of the microresonator.
2Length of moving object
If micro-scale devices are used to achieve higher operating frequencies, then device size is reduced, but manufacturing precision becomes more difficult
Solution Approach 1:
The patent replaces the mechanical approach of scaling down device dimensions to achieve high frequencies with a dynamic approach using multi-frequency excitation. Instead of fabricating smaller devices (which becomes increasingly difficult), the system uses a micro-scale device with nonlinear characteristics and excites it at multiple frequencies to achieve high-frequency operation. This substitution of mechanical scaling with dynamic control bypasses the manufacturing precision challenges.
Solution Approach 2:
The patent exploits dynamic nonlinear resonance phenomena to achieve high operating frequencies without requiring correspondingly small device dimensions. By applying multi-frequency excitation and utilizing the nonlinear dynamic response of the microresonator, the system can operate at high frequencies while maintaining a larger, more manufacturable device size. The dynamic behavior is controlled through frequency parameter selection rather than geometric scaling.
3Length of moving object
If carbon nanotube resonators are used to achieve high operating frequencies, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent uses conventional micro-scale resonator structures that are easier and less expensive to manufacture than carbon nanotube resonators. By utilizing multi-frequency excitation techniques, the system achieves high-frequency operation with these more accessible, easier-to-fabricate devices. This approach trades the extreme miniaturization of nanotubes for more practical micro-scale devices that can be manufactured with standard techniques.
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 approach enables micro- and nano-scale devices to operate across broader frequency ranges, enhancing their applicability in aerospace, radar, and energy harvesting applications by increasing bandwidth and amplitude, while avoiding the need for complex manufacturing processes.
Implementation Method 1
sweeping a frequency of the second source of excitation to induce at least one combination resonance in the device based on a combination of the frequency of the second source of excitation and the fixed frequency of the first source of excitation
Data Source
AI summary
Embodiments of multi-frequency excitation are described. In various embodiments, a natural frequency of a device may be determined. In turn, a first voltage amplitude and first fixed frequency of a first source of excitation can be selected for the device based on the natural frequency. Additionally, a second voltage amplitude of a second source of excitation can be selected for the device, and the first and second sources of excitation can be applied to the device. After applying the first and second sources of excitation, a frequency of the second source of excitation can be swept. Using the methods of multi-frequency excitation described herein, new operating frequencies, operating frequency ranges, resonance frequencies, resonance frequency ranges, and/or resonance responses can be achieved for devices and systems.