Vibration Frequency Control for High-Temperature Actuator Protection
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Solution Overview
Problem
Vibration devices in electronic devices, particularly those using damping foams made of polyurethane, face excessive vibration issues at high temperatures due to reduced viscosity and stiffness, potentially leading to damage.
Innovation Solution
An electronic device measures the resonant frequency of the vibration device at room temperature and determines a driving frequency based on this measurement to control the vibration device, thereby reducing output at higher temperatures and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping foam made of polyurethane is used in the vibration device, then vibration damping is provided at room temperature, but the damping foam loses stiffness and viscosity at high temperatures causing excessive vibration
Solution Approach 1:
The patent changes the material parameter of the damping foam from polyurethane to a temperature-resistant material such as silicone foam or rubber foam. This material substitution maintains the damping function across a wider temperature range, specifically preventing the loss of stiffness and viscosity that occurs with polyurethane at high temperatures.
2Adaptability or versatility
If the vibration device operates at high temperature, then the electronic device can function in hot environments, but the reduced stiffness of the damping foam causes excessive vibration and potential damage
Solution Approach 1:
The patent modifies the material parameters by selecting damping foam materials (silicone or rubber foam) that maintain their mechanical properties at high temperatures. These materials exhibit temperature-resistant characteristics that prevent excessive vibration even when operating in hot environments, thereby maintaining vibration control stability across different environmental conditions.
3Ease of operation
If the damping foam stiffness is reduced at high temperature, then the material becomes more flexible, but stress on the elastic member increases causing potential damage
Solution Approach 1:
The patent changes the material composition of the damping foam to temperature-resistant materials that maintain their stiffness at high temperatures. This prevents the transfer of excessive stress to the elastic member, thereby protecting the structural integrity of the vibration device while still allowing necessary flexibility for vibration absorption.
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 method effectively reduces the vibration output of the vibration device at elevated temperatures, preventing damage and ensuring stable operation.
Implementation Method 1
measuring a resonant frequency of the vibration device at a room temperature and determining a driving frequency of the vibration device based on the resonant frequency
Data Source
AI summary
According to an embodiment, provided may be an electronic device comprising a vibration device, at least one processor electrically connected to the vibration device, and a memory for storing instructions, wherein the instructions, when executed by the at least one processor, cause the electronic device to: increase or decrease a vibration frequency of the vibration device for a predetermined period of time; on the basis of a signal output from the vibration device, obtain a resonant frequency of the vibration device; determine a vibration frequency causing the output of the vibration device at a temperature higher than room temperature to be less than the output at room temperature, as a driving frequency of the vibration device; and control the vibration device to be driven at the determined driving frequency. Various other embodiments are possible.