Autonomous Sensor Snap-Through Buckling Beam Energy Harvesting
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Solution Overview
Problem
Linear resonant mechanical structures are inefficient for energy harvesting due to their limited frequency range and amplitude compatibility with the wide frequency spectrum and varying amplitudes of mechanical vibrations, necessitating the development of nonlinear structures like snap-through buckling (STB) devices with deterministic switching thresholds.
Innovation Solution
A nonlinear bistable device with a snap-through buckling beam, piezoelectric transducers, and an ultra-low-power microcontroller unit that operates as both an energy harvester and sensor, utilizing deterministic and noise-induced switching events to generate energy and detect vibrations without the need for a power storage component, allowing simultaneous energy harvesting and sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear resonant mechanical structures are used for energy harvesting, then the device can operate at a specific resonance frequency, but the frequency range and amplitude compatibility are limited
Solution Approach 1:
The patent changes the structural parameters of the mechanical system by introducing nonlinearity through snap-through buckling geometry. This allows the device to operate across a wide frequency spectrum (0.1 Hz to 10 Hz) rather than at a single resonance frequency, while maintaining a relatively simple beam-based structure. The nonlinear potential energy landscape with multiple stable states enables frequency-independent energy harvesting.
Solution Approach 2:
The patent employs dynamic switching between stable states in a bistable snap-through buckling beam. The system transitions between two stable equilibrium states in response to vibrations, with switching events occurring stochastically based on noise-induced perturbations. This dynamic behavior enables the device to harvest energy from a broad range of vibration frequencies and amplitudes without requiring precise frequency matching.
2Loss of energy
If noise-induced switching events are utilized for energy harvesting, then energy conversion efficiency improves across wide frequency ranges, but the device requires complex nonlinear structures
Solution Approach 1:
The patent converts environmental noise, which is typically considered a harmful or unwanted factor, into a beneficial resource for triggering switching events. The noise-induced stochastic transitions between stable states enable energy harvesting across wide frequency ranges. By leveraging noise rather than requiring precise resonance conditions, the system achieves superior energy conversion efficiency from ambient vibrations.
Solution Approach 2:
The patent changes the structural parameters to create a nonlinear snap-through buckling beam with a specific potential energy landscape featuring two stable equilibrium states. This nonlinear geometry, achieved through controlled buckling of the beam structure, enables the system to respond to a broad spectrum of vibration inputs and convert them into electrical energy through piezoelectric transducers during switching events.
3Extent of automation
If simultaneous energy harvesting and sensing is implemented, then operational autonomy is enhanced, but the device requires integration of multiple functional components
Solution Approach 1:
The patent implements a universal device that performs both energy harvesting and vibration sensing functions simultaneously using the same core components. The snap-through buckling beam with piezoelectric transducers generates electrical energy during switching events while also producing voltage signals that encode vibration information. The microcontroller processes these signals for both power management and sensing applications, eliminating the need for separate power and sensing systems.
Solution Approach 2:
The patent merges the energy harvesting and sensing functions into a single integrated system. The piezoelectric transducers serve dual purposes: generating electrical energy during beam switching events and simultaneously providing voltage signals that contain vibration information for sensing. The microcontroller unit processes these signals for both power management and environmental vibration detection, reducing overall system complexity despite enhanced functionality.
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 device effectively harvests energy and detects vibrations across a wide range of frequencies and amplitudes, enhancing energy conversion efficiency and operational autonomy by leveraging noise-induced switching events and deterministic input signals.
Implementation Method 1
two piezoelectric transducers that convert the mechanical energy into electrical energy and produce an output signal
Data Source
AI summary
An autonomous sensor that includes a snap-through buckling beam, a proof mass, an ultra-low-power microcontroller unit, a wireless transmitter, a power management unit, and a power storage unit. The snap-through buckling beam produces mechanical energy. The proof mass is attached to the snap-through buckling beam. The proof mass transfers mechanical energy to two piezoelectric transducers that convert the mechanical energy into electrical energy and produce an output signal. The ultra-low-power microcontroller unit converts the output signal into output data. The wireless transmitter transfers the output data to an external device. The power management unit provides the electrical energy to the ultra-low-power microcontroller unit and the wireless transmitter. The power storage unit is rechargeable, stores electrical energy from the two piezoelectric transducers, and non-replaceable. The autonomous sensor simultaneously harvests energy and measures vibrations in an external environment.