Fluid Vibration Damping Device with Composite Moveable Plate
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Solution Overview
Problem
Existing fluid-filled vibration damping devices face limitations in effectively damping vibrations across a wide frequency range and suffer from noise and vibration issues due to cavitation and excessive elastic deformation, leading to durability concerns and noise generation.
Innovation Solution
A fluid-filled vibration damping device with a hydraulic pressure absorbing mechanism using a moveable rubber plate and a constraining plate, where the pressure-receiving and equilibrium chambers communicate through a slit that opens to alleviate pressure fluctuations, and the constraining plate limits excessive deformation to prevent noise and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moveable member made of rubber elastic body alone with large openings is used to absorb pressure fluctuations, then vibration damping capacity is maintained at high frequencies, but the moveable member experiences high elastic deformation and strikes against the rim, producing noise
Solution Approach 1:
The moveable member is constructed as a composite structure combining a rubber elastic body with a rigid plate. The rubber elastic body provides flexibility and vibration damping, while the rigid plate reinforces the structure to prevent excessive deformation and striking against the rim, thereby eliminating noise while maintaining vibration damping capacity.
2Reliability
If an orifice passage is tuned to a specific frequency range, then effective vibration damping is achieved at that frequency, but the orifice passage becomes obstructed at higher frequencies due to anti-resonance effect, declining vibration damping capacity
Solution Approach 1:
The pressure-receiving chamber is divided into two chambers by the moveable member, creating a segmented structure. This segmentation allows the system to handle different frequency ranges effectively: the orifice passage handles the tuned frequency range, while the moveable member with its openings handles higher frequency ranges, thus expanding the overall frequency range coverage without compromising vibration damping capacity.
3Reliability
If a slit is formed in the moveable member to allow pressure equalization, then cavitation is prevented, but stress concentrates at the ends of the slit, making the moveable member prone to rupture
Solution Approach 1:
The moveable member combines a rubber elastic body with a rigid plate to create a composite structure. The rigid plate provides structural reinforcement that distributes stress away from the slit ends, preventing stress concentration and rupture while the slit remains functional for pressure equalization and cavitation prevention.
Solution Approach 2:
The rigid plate embedded in the rubber elastic body acts as a preventive reinforcement before stress can concentrate at the slit ends. This beforehand cushioning through structural reinforcement prevents the harmful effect of stress concentration and potential rupture while maintaining the necessary flexibility for pressure equalization.
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 solution provides effective vibration damping across a wide frequency range, reduces noise and vibration, and ensures consistent cavitation prevention while maintaining durability by controlling pressure fluctuations and limiting deformation.
Implementation Method 1
through transmission of hydraulic pressure of the pressure-receiving chamber to the equilibrium chamber side through displacement of the moveable member in the direction of its thickness
Implementation Method 2
The intended vibration damping effect is produced on the basis of the flow action of fluid that is induced to flow through the orifice passage between the chambers
Implementation Method 3
the slit opens up through elastic deformation of the moveable rubber plate in the section thereof where the slit has been formed
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A fluid filled type vibration damping device (10, 92) including: a main rubber elastic body (16) connecting first and second mounting members (12, 14); a pressure-receiving chamber (60) and an equilibrium chamber (62) situated to either side of a partition member (44) with a non-compressible fluid filled therein; an orifice passage (68) through which the two chambers (60, 62) communicate with one another; a moveable rubber plate (72, 96) installed on the partition member (44); and a constraining plate (74, 98) affixed to the moveable rubber plate (72, 96). The constraining plate (74, 98) has at least one penetrating window (84) such that the moveable rubber plate (72, 96) closes off the penetrating window (84). A slit (86) is formed in the moveable rubber plate (72, 96) in the section thereof that closes off the penetrating window (84). The slit (86) will open up through elastic deformation of the moveable rubber plate (72, 96), and short circuit the pressure-receiving chamber (60) and the equilibrium chamber (62), thereby constituting a short circuiting mechanism.