Three-Axis Vibration Isolation with Frictionless Stiffness Tuning
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Solution Overview
Problem
Existing vibration isolation systems face challenges in passive, frictionless adjustment of horizontal stiffness according to load mass, poor low-frequency isolation performance in torsional axes, and lack of independent adjustment of translational and torsional natural frequencies.
Innovation Solution
An isolation system with a tension mechanism and adjustable beams, allowing manual or automatic adjustment of stiffness and natural frequencies in three axes, using a tension wire and slide mechanism to isolate vibrations without friction, and adjust torsional frequency independently of translational frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive systems with hinged structures are used for horizontal stiffness adjustment, then the system can adjust stiffness without sensors and actuators, but friction and backlash occur during vibrations which decrease isolation performance at low frequencies
Solution Approach 1:
The invention extracts the hinged structure from the system and replaces it with a tension mechanism consisting of tension wires and adjustable beams. This removes the source of friction and backlash while maintaining the ability to adjust horizontal stiffness passively by changing beam positions through channels, thereby improving low-frequency isolation performance.
Solution Approach 2:
The invention changes the physical state of the stiffness adjustment mechanism from hinged (with friction) to tension-based (frictionless). By adjusting the position of beams within channels to change the tension geometry, the horizontal stiffness can be modified without friction or backlash, resolving the contradiction between adaptability and reliability.
2Stability of the object's composition
If torsional stiffness is increased to improve structural stability, then the system becomes more stable, but the torsional natural frequency becomes higher than translational natural frequency which degrades vibration isolation performance in the torsional axis
Solution Approach 1:
The invention segments the stiffness control function by using separate tension wires for translational stiffness adjustment and separate adjustable beams for torsional stiffness control. This allows independent optimization of each degree of freedom, enabling the system to maintain structural stability while keeping torsional natural frequency below translational frequencies for improved isolation performance.
Solution Approach 2:
The invention makes the torsional stiffness dynamically adjustable through the position of beams in channels, allowing the system to adapt torsional stiffness independently from translational stiffness. This dynamic adjustment capability enables optimal tuning where torsional natural frequency remains lower than translational frequencies, improving vibration isolation in the torsional axis while maintaining structural stability.
3Adaptability or versatility
If multiple spring compression mechanisms are used for horizontal stiffness adjustment, then stiffness can be adjusted, but the adjustment cannot be made from a single center and the system becomes more complex
Solution Approach 1:
The invention merges multiple stiffness adjustment functions into a single centralized tension mechanism. By using tension wires connected to a central point and adjustable beams that can be positioned in channels, the system achieves horizontal stiffness adjustment from a single center, simplifying the overall structure while maintaining adaptability.
4Device complexity
If the isolation system is designed for vertical isolation only, then the structure is simpler, but horizontal vibration isolation and torsional vibration isolation are not provided
Solution Approach 1:
The invention makes the tension mechanism and adjustable beams serve multiple functions: they provide horizontal vibration isolation, torsional vibration isolation, and enable stiffness adjustment in all three axes. This multi-functionality is achieved through the geometric configuration of tension wires and the ability to adjust beam positions in channels, allowing a single mechanism to handle multiple isolation requirements without proportionally increasing complexity.
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
Achieves passive, frictionless vibration isolation at very low frequencies in three axes, with adjustable stiffness and wide frequency ranges, enhancing isolation performance and adaptability to changing loads.
Implementation Method 1
at least one tension wire (21) in the center configured to change the natural frequencies of the isolation system (10) by at least partially bringing the said base platform (11) and the said carrying platform (12) closer together
Implementation Method 2
a plurality of beams (30) provided with equal distance between them and equal angles with respect to the center around the said tension wire (21), which can be compressed at least partially under force by at least partially bringing the base platform (11) and the carrying platform (12) closer together
Implementation Method 3
at least one isolation system configured to at least partially isolate the translational vibration in the directions of an X axis and a Y axis and the torsional vibration around a Z axis that may excite the load by being positioned between a ground and a load
Data Source
AI summary
An isolation system configured to at least partially isolate possible translational vibration in the directions of an X axis and a Y axis and the possible torsional vibration around a Z axis may be experienced by the load by being positioned between a ground and a load. The isolation system includes: a base platform that can be associated with the ground, a carrying platform that can be associated with the load, a tension wire in the center configured to change the natural frequencies of the isolation system by at least partially bringing the base platform and the carrying platform closer together, and a plurality of beams provided with equal distance between them and equal angles with respect to the center around the tension wire, which can be compressed at least partially under force by at least partially bringing the base platform and the carrying platform closer together.