Fluid-Filled Vibration Damping Device With Tuned Mass-Spring Plate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluid-filled vibration damping devices face limitations in effectively damping low-frequency vibrations and preventing noise and vibration issues due to cavitation caused by excessive negative pressure, and the existing communication and blocking control mechanisms can restrict vibration insulation performance.
Innovation Solution
A fluid-filled vibration damping device with a mass-spring system integrated into the closing rubber elastic plate, where the resonance frequency is set to 50 Hz or greater, and the orifice passage is tuned to a lower frequency, allowing for active opening of connecting holes during specific vibrations to enhance fluid flow and vibration damping, while preventing cavitation by controlling pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closing rubber elastic plate is used to block the connecting hole, then cavitation is prevented during excessive negative pressure, but the plate may restrict fluid flow during normal vibrations
Solution Approach 1:
The closing rubber elastic plate is designed to be dynamically controllable, transitioning between blocked and open states based on pressure conditions. During excessive negative pressure, the plate blocks the connecting hole to prevent cavitation. During normal vibrations, the plate opens to allow fluid flow action, thus resolving the contradiction between reliability and productivity.
2Ease of operation
If the closing rubber elastic plate is made more flexible to improve high-frequency vibration damping, then vibration insulation improves, but the plate may open during low-frequency vibrations reducing damping effectiveness
Solution Approach 1:
The resonance frequency of the mass-spring system is specifically tuned to 50 Hz or greater, creating a frequency-dependent behavior. This parameter change allows the plate to respond differently to various vibration frequencies: flexible enough for high-frequency damping while remaining stable during low-frequency vibrations, thus resolving the contradiction between ease of operation and reliability.
3Loss of energy
If the orifice passage is tuned to low frequency for engine shake damping, then low-frequency vibration damping improves, but high-frequency noise damping becomes insufficient
Solution Approach 1:
The vibration damping system is segmented into two frequency ranges: low-frequency damping handled by the orifice passage and high-frequency damping handled by the mass-spring system with the closing rubber elastic plate. This segmentation allows each component to specialize in its frequency range, resolving the contradiction between low-frequency energy loss and high-frequency noise control.
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 improved vibration damping effects for both low-frequency vibrations and high-frequency noise reduction, with enhanced fluid flow and reduced dynamic spring effects, effectively addressing the limitations of previous designs.
Implementation Method 1
a resonance frequency of the mass-spring system is tuned to 50 Hz or greater
Implementation Method 2
the resonance action of fluid that flows through an orifice path due to the difference in pressure between the pressure receiving chamber and the equilibrium chamber
Implementation Method 3
exhibiting an absorption function of the pressure fluctuation of the pressure receiving chamber by being elastically deformed in a blocked state
Implementation Method 4
when the pressure receiving chamber to which a large amplitude vibration has been input goes to an excessively negative pressure state, the air dissolved in the fluid of the pressure receiving chamber undergoes liquid phase separation, and cavitation bubbles are formed
Data Source
AI summary
A fluid-filled vibration device including a pressure receiving chamber and an equilibrium chamber communicated by an orifice passage and a connecting hole provided on a partition member partitioning the two chambers. The connecting hole is closed by a closing rubber elastic plate to which pressures of the two chambers are applied from the respective sides. The closing rubber elastic plate includes at its outer circumference edge part abutting retaining parts held by the partition member, an elastic deformation area which is provided circumferentially between the abutting retaining parts and elastically deformed to open the connecting hole, and a mass part provided at a circumference direction intermediate part of the elastic deformation area to constitute a mass-spring system together. The resonance frequency of the system is tuned to 50 Hz or greater and set higher than a tuning frequency of the orifice passage.