Impedance Structure for Tragus Vibration Simulation Accuracy
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Solution Overview
Problem
Existing devices for simulating the impact of a human head on vibration units, such as bone conduction earphones and hearing aids, fail to accurately replicate the mechanical impedance of the facial area in front of the auricle, as they typically simulate the impedance of the mastoid bone behind the ear, leading to inadequate simulation scenarios.
Innovation Solution
An impedance device comprising a mass part, an elastic part, and a fixing part, where the mass part is connected to the fixing part through the elastic part, with an elastic coefficient in the range of 600 N/m to 5000 N/m, designed to simulate the mechanical impedance of the tragus area by adjusting the mass and elastic coefficient to match the impedance of the facial area, thereby providing a more accurate simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing devices simulate the mechanical impedance of the mastoid bone behind the ear, then the simulation structure is simple and well-established, but the simulation accuracy for facial area applications (front side of auricle) is insufficient due to significantly different mechanical impedance characteristics
Solution Approach 1:
The impedance device is divided into three distinct functional segments: a mass part (simulating skull/mastoid bone), an elastic part (simulating soft tissue), and a fixing part (providing structural support). This segmentation allows each component to independently contribute to the overall mechanical impedance, enabling accurate simulation of the facial area's composite impedance characteristics while maintaining modular simplicity in the device structure.
Solution Approach 2:
The device applies local quality by assigning specific mechanical properties to each part: the mass part provides inertial resistance, the elastic part provides compliance, and the fixing part provides structural stability. This localized functional assignment enables the device to accurately represent the spatially varying mechanical impedance of the facial area, where different tissues (bone, cartilage, soft tissue) contribute differently to the overall impedance.
2Measurement precision
If the elastic coefficient of the elastic part is adjusted to match the mechanical impedance of the facial area (600 N/m to 5000 N/m), then the simulation accuracy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a range for the elastic coefficient (600 N/m to 5000 N/m) rather than a single precise value, allowing manufacturers to produce elastic parts within this range while still achieving accurate simulation. This parameter change approach balances simulation accuracy with manufacturing feasibility, as the frequency response curve remains consistent across this range.
Solution Approach 2:
The device uses an elastic part with a relatively high elastic coefficient range (600-5000 N/m) to ensure sufficient stiffness for accurate impedance simulation, while the mass part compensates for any variations. This partial action approach ensures that even with manufacturing tolerances in the elastic coefficient, the overall mechanical impedance remains within acceptable simulation accuracy.
3Ease of manufacture
If the impedance device uses a hollow structure with a cavity formed by the elastic part and fixing part, then the device complexity is reduced and manufacturing is easier, but the simulation of soft tissue compliance may be compromised
Solution Approach 1:
The elastic part acts as an intermediary between the mass part (representing bone) and the external environment, providing the necessary compliance to simulate soft tissue. The hollow structure with cavity maintains this compliance function while reducing material usage and simplifying manufacturing, as the elastic part's material properties and geometric configuration together provide the required mechanical behavior.
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 impedance device effectively simulates the mechanical impedance of the tragus area, ensuring that the frequency response curve of the vibration unit when coupled with the device matches the actual frequency response when worn near the tragus area, enhancing the accuracy of vibration simulation and testing.
Implementation Method 1
The mass part is connected to the fixing part through the elastic part. The elastic part and the fixing part form a cavity. An elastic coefficient of the elastic part in a vibration direction in which the mass part vibrates relative to the fixing part is in a range of 600 N/m to 5000 N/m.
Data Source
AI summary
The present disclosure provides an impedance device and a system for simulating an impact of a head on a vibration of a vibration unit. The impedance device may include a mass part, an elastic part, and a fixing part. The mass part is connected to the fixing part through the elastic part. The fixing part is a hollow structure, the fixing part includes an opening. The elastic part is located at the opening and is connected to the fixing part. The elastic part forms a cavity with the fixing part. An elastic coefficient of the elastic part of a vibration direction in which the mass part vibrates relative to the fixing part in a range of 600 N/m~5000 N/m.