Segmented Damper Reduces Viscous Fluid Noise
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Solution Overview
Problem
Existing linear vibration generating apparatuses experience unnecessary noise due to surface contact between magnetic fluids and dampers, leading to separation and friction issues.
Innovation Solution
A damper with a modified shape that prevents simultaneous surface contact with the entire viscous or magnetic fluid, featuring protrusions, grooves, and a symmetrical design to allow partial contact and reduce noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a damper is designed to make surface contact with magnetic fluid to absorb impact, then impact absorption performance is improved, but noise is generated due to separation and friction between the damper and magnetic fluid
Solution Approach 1:
The damper surface is segmented into multiple contact regions rather than a single continuous contact surface. The magnetic fluid contacts only specific segmented portions of the damper surface, preventing simultaneous full-surface contact and separation that causes noise.
Solution Approach 2:
The damper is designed with specific local surface characteristics where magnetic fluid contact is intended. Only certain local regions of the damper surface are designed to contact magnetic fluid, while other regions remain non-contacting, creating controlled interaction zones that reduce noise.
2Strength
If a damper makes full surface contact with magnetic fluid, then impact absorption is enhanced, but fluid pillars form causing detachment noise
Solution Approach 1:
The contact interface between damper and magnetic fluid is segmented into discrete regions. This segmentation prevents the formation of continuous fluid pillars that would detach and cause noise, while still providing sufficient contact areas for effective impact absorption.
3Object-generated harmful factors
If damper shape is modified to prevent full magnetic fluid contact, then noise is reduced, but impact absorption area is decreased
Solution Approach 1:
The damper design applies local quality by creating specific zones with different surface characteristics. Certain local regions are designed for magnetic fluid contact to provide impact absorption, while other regions are designed to prevent contact and reduce noise, achieving both goals simultaneously.
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 modified damper structure effectively reduces noise by preventing the formation of fluid pillars and minimizing detachment noise, while also expanding its weight range to absorb impacts more effectively.
Implementation Method 1
a magnetic fluid (MF) 70 is frequently used as the fluid-type damper with viscosity
Implementation Method 2
the magnetic fluid 70 has magnetism to keep a fixed location without deviating from the location due to the magnetic force with the magnet 521
Implementation Method 3
a coil 531 provided at the yoke 533 to generate an electromagnetic force to the magnet 521
Implementation Method 4
an elastic body (e.g., a spring) 540 for physically supporting the vibrating body 520
Implementation Method 5
an electromagnetic force generated at the coil 531 and a physical elastic force provided by the elastic body 540 have resonance to each other
Data Source
AI summary
Disclosed is an apparatus for generating linear vibration with a damper, which includes a housing having an inner space formed therein, a fixed body provided in the inner space and having a coil, a vibrating body having a magnet and a weight coaxially disposed with the coil and configured to move in a vertical direction on the basis of the fixed body, an elastic body configured to elastically support the vibrating body, a viscous fluid provided at an upper surface of the magnet and having viscosity, and a damper installed in the housing to face an upper surface of the vibrating body and configured to make a surface contact with the viscous fluid when the vibrating body moves upwards, the damper having a shape not making a surface contact with the entire viscous fluid simultaneously.