Fluid-Filled Vibration Damping Device With Elastic Buffer Body
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fluid-filled vibration damping devices experience degraded performance at frequencies outside the tuning frequency due to increased dynamic spring constant and generate striking noise from movable member contact with the housing space, leading to abnormal noise and reduced vibration damping effectiveness.
Innovation Solution
A fluid-filled vibration damping device with a partition member and elastic buffer body, where the communication holes are narrowed by windows formed in the elastic buffer body, reducing the dynamic spring constant and minimizing noise by attenuating impact energy through internal friction, and maintaining effective vibration damping across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid-pressure transmission mechanism with a movable member is used to transmit liquid pressure between chambers, then vibration damping effect is obtained at high frequencies, but striking noise is generated when the movable member contacts the housing space
Solution Approach 1:
A viscous fluid is introduced as an intermediary substance between the movable member and the housing space. This fluid layer prevents direct contact between the movable member and housing space, thereby eliminating striking noise while still allowing the liquid-pressure transmission mechanism to function effectively for vibration damping
2Reliability
If the orifice passage is shut off due to antiresonance at high frequencies, then the movable member can transmit liquid pressure, but the dynamic spring constant increases rapidly degrading vibration damping performance
Solution Approach 1:
The harmful effect of rapid dynamic spring constant increase is extracted and addressed separately by introducing the viscous fluid damping mechanism. The viscous fluid provides continuous damping action that counteracts the spring constant increase, allowing the system to maintain stable vibration damping performance even when the orifice passage is shut off
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 device achieves stable vibration damping performance across a wide range of frequencies by reducing the dynamic spring constant and minimizing noise through energy attenuation, preventing rapid increases in dynamic spring constant and maintaining effective vibration isolation.
Implementation Method 1
a viscous fluid is introduced into the housing space... the striking noise is reduced by the energy attenuation effect based on inner frictions and the like of the elastic buffer body
Implementation Method 2
utilizing the flow behavior of a fluid sealed therein... vibration damping effects based on the flow behavior of a fluid
Implementation Method 3
an elastic buffer body supported by the partition member and arranged in the housing space... the striking noise is reduced by the energy attenuation effect based on inner frictions and the like of the elastic buffer body
Implementation Method 4
filled with a non-compressible fluid sealed therein... utilizing the flow behavior of a fluid sealed therein
Implementation Method 5
the liquid pressures of the pressure-receiving chamber and the equilibrium chamber are each applied to either side of the movable member
Data Source
AI summary
A fluid-filled vibration damping device including an elastic buffer body supported by a partition member and arranged in a housing space such that at least one of wall inner surfaces of the housing space on sides of a pressure-receiving chamber and an equilibrium chamber is covered by the elastic buffer body. Windows are formed to penetrate the elastic buffer body at portions corresponding to communication holes formed in walls of the housing space so that the communication holes are narrowed by the windows of the elastic buffer body, and a ratio (a/l) of an opening area (a) of the windows to a penetration length (l) thereof is made smaller than a ratio (A/L) of an opening area (A) of the communication holes to a penetration length (L) thereof.