Piezo-Electric Dome De-icing via Structural Resonance
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Solution Overview
Problem
Existing de-icing systems for aircraft domed protective housings fail to detect ice build-up independently and maintain the transparent structure's transmissivity, as they either obscure the view or require excessive electrical power.
Innovation Solution
A de-icing system using piezo-electric actuators to generate ultrasonic frequencies that induce structural resonance in the dome, combined with sensing mechanisms to detect and prevent ice build-up, allowing for efficient ice removal and detection without obstructing the view or requiring excessive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If heating filaments are embedded in the dome structure, then ice build-up can be melted, but the transmissivity of the dome is blocked and the view is obscured
Solution Approach 1:
The de-icing function is extracted from the dome structure itself and implemented separately through piezoelectric actuators mounted on the exterior surface. This allows the dome to remain transparent while the actuators provide ice removal through ultrasonic vibrations, eliminating the need for embedded heating filaments that would block the view.
Solution Approach 2:
The thermal de-icing method (heating filaments) is replaced with a mechanical vibration method (piezoelectric actuators). The piezoelectric actuators generate ultrasonic vibrations that mechanically disrupt and remove ice build-up without requiring thermal energy that would obscure the dome's transparency.
2Object-affected harmful factors
If electro-thermal de-icing is applied at the base of the dome, then ice can be melted, but excessive electrical power is required to maintain temperatures above dew point
Solution Approach 1:
The system uses piezoelectric actuators to generate ultrasonic vibrations (mechanical vibration) that directly remove ice build-up through resonant frequencies. This mechanical approach consumes significantly less electrical power compared to electro-thermal methods that require continuous heating to maintain temperatures above the dew point.
Solution Approach 2:
The piezoelectric actuators operate in periodic pulses rather than continuously, applying ultrasonic vibrations only when needed for ice removal. This periodic operation dramatically reduces electrical power consumption compared to continuous electro-thermal heating systems.
3Object-affected harmful factors
If wide-band electro-mechanical vibrations are used to remove ice, then ice can be removed from wing leading edges, but the system cannot independently detect the presence of ice
Solution Approach 1:
The piezoelectric actuators serve dual functions: they act as both sensors for detecting ice presence and as actuators for removing ice. By monitoring the vibrational response and impedance changes of the piezoelectric elements, the system can detect ice build-up and automatically activate de-icing when needed, eliminating the need for separate detection systems.
Solution Approach 2:
The piezoelectric actuators perform self-detection and self-activation for ice removal. The system monitors its own operational parameters (vibration frequency, impedance, resonant response) to detect ice presence and automatically adjusts its operation to remove ice when detected, without requiring external sensing systems or manual intervention.
4Object-affected harmful factors
If the dome structure is made compliant to allow deformation for ice removal, then electro-magnetic de-icing can be effective, but the structural integrity and precision mounting are compromised
Solution Approach 1:
The piezoelectric actuators serve as an intermediary mechanism between the rigid dome structure and the ice removal function. They transmit ultrasonic vibrations to the dome surface and ice build-up without requiring the dome itself to be compliant or deformable, thus maintaining structural rigidity while enabling effective ice removal.
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 system effectively maintains a domed structure free from ice and moisture while preserving transparency, using minimal energy and automating the de-icing process based on detected ice presence, ensuring efficient and power-efficient ice removal and prevention.
Implementation Method 1
the means for generating ultrasonic frequencies in the housing comprising piezo-electric actuators
Implementation Method 2
structural resonance of the housing is induced by the generating means
Data Source
Figure 1~2
AI summary
A de-icing system for a hemispherical protective housing 1 mounted on an aircraft structure is described. The system comprises a series of piezo-electric devices mounted at the boundary 2 of the housing 1. The piezo-electric devices generate ultrasonic frequencies and resonance of the protective housing is induced. One of the piezo-electric devices senses the frequency generated in the protective housing and acts as part of a feedback loop to maintain structural resonance of the protective housing 1. The structural resonance of the protective housing 1 prevents the build-up of ice. Additionally, higher power resonances can be generated to remove ice already built up on the protective housing 1. The system also enables detection of ice build-up on the protective housing 1 by monitoring any change in the frequency required to maintain structural resonance of the protective housing 1.