Metal Wire Damper Planar Structure for Compact Sound Devices
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Solution Overview
Problem
Existing dampers in sound-producing devices occupy excessive space, have poor compliance under large vibration displacement, and are prone to deformation and fatigue in high temperature and humidity environments due to their fibrous material composition.
Innovation Solution
A damper with a planar structure made of metal wire, featuring a line-like shape formed by winding, with adjustable mechanical stiffness and resistance to fatigue, utilizing a Young's modulus of 0.7e11 Pa to 3e11 Pa and a mechanical stiffness of 0.2 N/mm to 2 N/mm, and designed to occupy minimal space while providing better compliance and resistance to environmental influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a fibrous material damper with corrugated shape is used, then the damper can provide elastic force for reciprocating motion, but it occupies large space in the height direction
Solution Approach 1:
The patent changes the material parameter from fibrous material to metal wire material, and changes the structural parameter from corrugated shape to planar structure. This allows the damper to maintain the required elastic force while significantly reducing the height occupation, as the metal wire can be formed into a compact planar configuration that provides the necessary mechanical compliance without extending in the height direction
Solution Approach 2:
The patent uses metal wire as the damper material, which combines the elastic properties needed for reciprocating motion with the structural integrity to maintain a compact form. The metal wire can be formed into planar structures that provide both the required mechanical compliance and space efficiency, unlike traditional fibrous materials that require corrugated three-dimensional structures to achieve similar elastic properties
2Ease of manufacture
If fibrous materials are used for the damper, then the damper can be manufactured, but the mechanical stiffness Kms cannot be made very small, resulting in poor compliance under large vibration displacement
Solution Approach 1:
The patent changes the material from fibrous material to metal wire material, which allows for precise control of mechanical stiffness through wire diameter and structure design. The metal wire can be manufactured with specific diameters (e.g., 0.2-0.5mm as mentioned in the patent) and formed into planar structures with controlled bending tracks, enabling the mechanical stiffness to be reduced to very small values (Kms < 1 N/mm) while maintaining manufacturability through standard metal forming processes
Solution Approach 2:
The patent employs curved planar structures with bending tracks formed from metal wire. The curvature and number of bending tracks are designed to control the mechanical stiffness, allowing the damper to provide the necessary compliance under large vibration displacement. The planar structure with multiple bending tracks creates a spring-like effect that reduces mechanical stiffness while maintaining structural integrity
3Ease of operation
If fibrous material dampers are used, then they can function in the sound-producing device, but they are prone to deformation and hardness variation in high temperature and high humidity environments
Solution Approach 1:
The patent changes the material from hygroscopic fibrous material to metal wire material, which has stable physical and chemical properties that are not affected by humidity. The metal wire maintains consistent mechanical properties (elastic modulus, strength) across a wide range of temperatures and humidity conditions, eliminating the deformation and hardness variation problems associated with fibrous materials in high temperature and high humidity environments
Solution Approach 2:
The use of metal wire as the damper material provides inherent resistance to environmental degradation. Metal materials do not absorb moisture like fibrous materials, and their mechanical properties remain stable under thermal and humid conditions. This eliminates the reliability issues of fibrous dampers in harsh environments while maintaining the required functional performance
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 metal wire damper reduces the resonant frequency and total harmonic distortion of sound-producing devices, enhances fatigue resistance, and allows for the manufacturing of compact, reliable sound-producing devices with improved acoustic performance.
Implementation Method 1
a planar elastic part, which is formed by an end of the first connecting part being bent and extending toward the other side of the first connecting part
Data Source
AI summary
Disclosed are a damper and a sound-producing device. The damper includes a first connecting part, a planar elastic part and a second connecting part. One side of the first connecting part is cooperatively connected to a voice coil; an end of the first connecting part is bent and extends toward the other side of the first connecting part to form the planar elastic part, the planar elastic part and the first connecting part being in the same plane; the second connecting part is connected to one end of the planar elastic part away from the first connecting part and is configured to be fixedly connected; the damper is of a line-like shape formed by winding of a metal wire, a Young's modulus of a wire rod of the metal wire is 0.7e11 pa to 3e11 pa, a mechanical stiffness Kms of a wire rod of the metal wire is 0.2 N/mm to 2 N/mm.