Fluid-Filled Vibration Damping Device With Segmented Orifices
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Solution Overview
Problem
Conventional fluid-filled vibration damping devices struggle to effectively dampen vibrations across a wide frequency range due to limitations in resonance frequency adjustment and fluid flow restriction caused by high spring rigidity requirements.
Innovation Solution
A fluid-filled vibration damping device with multiple orifice passages of varying frequencies, where a pneumatic actuator with a flexible film adjusts the communication states of these passages to achieve efficient vibration damping across different frequency ranges by blocking or allowing fluid flow through the orifice passages, allowing for independent damping of low-frequency and high-frequency vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a high spring rigidity is set to the movable film to sufficiently change the resonance frequency of the orifice passage, then the resonance frequency can be adjusted, but fluid flow through the orifice passage is prevented by the movable film
Solution Approach 1:
The single orifice passage is segmented into multiple orifice passages (first, second, and third orifice passages) with different tuning frequencies. This segmentation allows each passage to handle different frequency ranges independently, resolving the contradiction by providing multiple pathways for fluid flow at different frequencies rather than relying on a single adjustable passage that restricts flow.
Solution Approach 2:
The pneumatic actuator dynamically changes the cross-sectional area of the orifice passages by applying positive or negative pressure to the movable film. This dynamic adjustment allows the system to optimize fluid flow at different frequencies without requiring the movable film to maintain high spring rigidity, thus resolving the contradiction between frequency adjustment and flow restriction.
2Adaptability or versatility
If a single orifice passage is used with pneumatic switching, then vibration damping at multiple frequencies can be achieved, but the device complexity increases due to the pneumatic actuator and switching mechanism
Solution Approach 1:
Instead of using a single orifice passage with complex pneumatic switching, the invention segments the orifice into multiple fixed passages with different tuning frequencies. This segmentation eliminates the need for complex switching mechanisms while achieving multi-frequency vibration damping through the combined action of multiple simpler passages.
Solution Approach 2:
The multiple orifice passages collectively perform the function of handling multiple frequency ranges simultaneously. Each passage is tuned to a specific frequency range, and together they provide universal vibration damping coverage without requiring complex switching or actuation mechanisms.
3Adaptability or versatility
If the movable film covers the orifice passage opening to set high frequency tuning, then the resonance frequency increases, but efficient vibration damping effect cannot be achieved due to prevented fluid flow
Solution Approach 1:
The vibration damping function is segmented across multiple orifice passages with different tuning frequencies. High-frequency damping is handled by the second orifice passage while low-frequency damping is handled by the first and third passages, allowing each passage to maintain optimal fluid flow for its specific frequency range without requiring the movable film to cover openings.
Solution Approach 2:
The system changes the parameter of orifice cross-sectional area dynamically through pneumatic actuation of the movable film. By applying positive or negative pressure, the cross-sectional area of different orifice passages is adjusted to optimize fluid flow and vibration damping efficiency at different frequencies, resolving the contradiction between high-frequency tuning and damping efficiency.
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 effective vibration damping across a wide frequency range by ensuring fluid flow through specific orifice passages, enhancing damping performance without restricting fluid flow, thus addressing the limitations of conventional devices.
Implementation Method 1
a fluid-filled vibration damping device adapted to utilize vibration damping effect exhibited based on flow action of a non-compressible fluid filling the interior
Implementation Method 2
a flexible film, the pressure-receiving chamber and the equilibrium chamber being filled with a non-compressible fluid; an actuator is disposed on an opposite side of the equilibrium chamber with the flexible film being interposed therebetween
Implementation Method 3
the pneumatic actuator includes a center recess formed in a portion facing the opening of the orifice passage on the side of an equilibrium chamber with a flexible film being interposed therebetween
Data Source
AI summary
A fluid-filled vibration damping device including a second orifice passage and a third orifice passage tuned to a lower frequency than the second orifice passage, and an actuator including an output portion facing openings of the second and third orifice passages on a side of an equilibrium chamber via a flexible film. The flexible film obstructs the openings of the second and third orifice passages when the output portion comes into contact against a partition member so that the third orifice passage is blocked while the second orifice passage is substantially placed in communication owing to a center recess of the output portion permitting deformation of the flexible film. Meanwhile, the flexible film is separated from the openings of the second and third orifice passages when the output portion is separated from the partition member so that the two orifice passages are placed in communication.