Periodic Fluid Isolator Structure for Vibration Stop-Band Control
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Solution Overview
Problem
Existing multi-stage vibration isolating apparatuses face limitations in improving robustness and vibration isolation performance due to the generation of local resonances at coupling portions, which restrict the enhancement of primary resonance frequency and rigidity.
Innovation Solution
A vibration propagation suppressing apparatus is designed with multiple stages of fluid machine elements, each comprising a first volume chamber, a second volume chamber, and an intermediate with an orifice, coupled through an elastic body, forming a periodic structure that scatters elastic waves within the fluid machine elements, thereby suppressing wave propagation between the primary and secondary resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rigidity of the elastic element is reduced to improve vibration isolation effect, then the vibration transmission characteristics shift to low frequency side and response magnification factor is reduced, but the rigidity to support the precision instrument decreases, causing spatial destabilization and increased settling time
Solution Approach 1:
The vibration isolating apparatus is divided into multiple stages, with intermediate masses positioned between the precision instrument and the base surface. Each stage includes elastic elements and damping elements, creating a segmented structure that improves vibration isolation without compromising support rigidity. The segmentation allows the system to achieve better vibration transmission characteristics while maintaining structural stability.
2Object-affected harmful factors
If multi-stage vibration isolating apparatus is used to improve vibration isolation effect, then the high-frequency slope steepens to -40 dB/dec, but local resonances are generated at coupling portions, limiting the enhancement of primary resonance frequency and rigidity
Solution Approach 1:
Intermediate masses are introduced as intermediary elements between the precision instrument and the base surface in the multi-stage vibration isolating apparatus. These intermediate masses serve as mediators that help distribute and manage vibration forces, allowing the system to achieve steeper high-frequency slopes while reducing the negative impact of local resonances on overall robustness.
Solution Approach 2:
The system utilizes parameter changes in the elastic elements and damping elements across different stages to optimize vibration isolation performance. By adjusting the rigidity and damping coefficients of these elements, the apparatus achieves improved vibration transmission characteristics while maintaining structural integrity and robustness despite the presence of local resonances.
3Object-affected harmful factors
If the number of stages is increased to achieve steeper high-frequency slope, then vibration isolation performance is improved, but the complexity of the apparatus increases and the primary resonance frequency enhancement is limited by local resonances
Solution Approach 1:
The vibration isolating apparatus is segmented into multiple standardized stages, each containing elastic elements, damping elements, and intermediate masses. This segmentation allows for modular design that can be scaled by adding or removing stages, thereby managing complexity while achieving the desired steep high-frequency slope and improved vibration isolation performance.
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
This configuration achieves excellent vibration isolation performance by creating a stop band with a steep frequency response, enhancing the apparatus's rigidity and robustness while maintaining effective vibration suppression.
Implementation Method 1
forming a periodic structure that scatters elastic waves within the fluid machine elements, thereby suppressing wave propagation between the primary and secondary resonance frequencies
Implementation Method 2
an intermediate of the first volume chamber of the one fluid machine element is connected to the intermediate of the fluid machine element adjacent to the first end portion side of the one fluid machine element through intermediation of an elastic body
Data Source
AI summary
In a vibration propagation suppressing apparatus, each of fluid machine elements includes: a first volume chamber; a second volume chamber coupled to the first volume chamber through an orifice; an intermediate forming the orifice; and a coupling rod. A first end portion of a first volume chamber is connected to an intermediate adjacent thereto, an intermediate of the first volume chamber is connected to the intermediate of the adjacent fluid machine element through intermediation of an elastic body, and the first volume chamber and the second volume chamber are connected to each other so as to be alternately arranged in a vibration propagation direction. A fluid machine element on a first stage has an intermediate connected to the base surface, and each of the plurality of fluid machine elements has dispersion relationships matching with each other, and has a band gap on the dispersion relationships.