Magnetic Negative-Stiffness Mechanism for 3D Vibration Isolation
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Solution Overview
Problem
Current vibration isolation systems face challenges in implementing larger, stable, and multi-dimensional negative stiffness, which limits their effectiveness in achieving improved vibration isolation while maintaining bearing performance.
Innovation Solution
A multi-dimensional magnetic negative-stiffness mechanism is developed using permanent magnets, integrating two-dimensional and one-dimensional negative-stiffness units through a floating structure to generate three-dimensional or two-dimensional negative stiffness, combined with a positive-stiffness mechanism for series-parallel composite vibration isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stiffness of the system is reduced to improve vibration isolation performance, then vibration isolation performance is improved, but bearing performance is reduced
Solution Approach 1:
The patent replaces traditional mechanical spring elements with a magnetic negative-stiffness mechanism that uses magnetic field forces to generate negative stiffness effects. This substitution allows the system to achieve improved vibration isolation performance through magnetic repulsion and attraction forces between permanent magnets, while the bearing capacity is maintained through the combined positive stiffness from mechanical supports and the controllable negative stiffness from the magnetic mechanism.
Solution Approach 2:
The patent changes the stiffness parameter from purely positive (mechanical springs) to negative (magnetic mechanism) by adjusting the configuration, distance, and magnetization of permanent magnets. This parameter change enables the magnetic negative-stiffness mechanism to provide vibration isolation forces that counteract vibrations while maintaining the ability to support static loads through the combination of positive and negative stiffness components.
2Reliability
If magnetic negative-stiffness technology is applied to improve vibration isolation, then vibration isolation performance is improved, but implementation of larger and stable multi-dimensional negative stiffness is difficult
Solution Approach 1:
The patent divides the complex multi-dimensional negative stiffness requirement into separate one-dimensional and two-dimensional magnetic negative-stiffness units. Each unit is designed to provide negative stiffness in specific directions, and they are combined through a floating frame structure to achieve comprehensive multi-dimensional vibration isolation. This segmentation makes the design and implementation of stable negative stiffness more manageable.
Solution Approach 2:
The patent transitions from one-dimensional to two-dimensional and three-dimensional negative stiffness by adding spatial dimensions to the magnetic mechanism configuration. The two-dimensional magnetic negative-stiffness unit uses multiple permanent magnets arranged in a plane to provide negative stiffness in multiple directions simultaneously, while the floating frame allows movement in three dimensions, achieving comprehensive multi-dimensional vibration isolation.
3Strength
If traditional shock absorbers are used, then bearing performance is maintained, but vibration isolation performance is limited due to friction and nonlinear problems
Solution Approach 1:
The patent replaces traditional mechanical shock absorber elements that rely on friction-based damping with a magnetic negative-stiffness mechanism that uses non-contact magnetic forces. This substitution eliminates friction and the associated nonlinear problems, providing more predictable and stable vibration isolation performance while maintaining bearing capacity through the combined positive and negative stiffness system.
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 approach enhances vibration isolation performance in multiple dimensions without compromising bearing capacity, utilizing non-contact magnetic forces to prevent friction-related nonlinear issues, and simplifies installation and maintenance.
Implementation Method 1
the magnetic field force is a non-contact force, which will not introduce friction and the nonlinear problem caused by friction
Data Source
AI summary
A multi-dimensional magnetic negative-stiffness mechanism and a multi-dimensional magnetic negative-stiffness vibration isolation system composed thereof are provided. The multi-dimensional damping system is composed of a positive-stiffness mechanism, a multi-dimensional negative-stiffness mechanism, a floating frame, a vibration isolated body, and a mounting base. The positive-stiffness mechanism is a traditional elastic element connected to the vibration isolated body and the mounting base, and provides supporting forces in an X direction, a Y direction, and a Z direction, and a basic vibration isolation function. The multi-dimensional negative-stiffness mechanism is composed of at least two negative-stiffness magnetic groups. Each negative-stiffness magnetic group may provide one-dimensional or two-dimensional negative stiffness. Through a series connection of the at least two negative-stiffness magnetic groups, a two-dimensional or three-dimensional negative-stiffness effect may be implemented to improve the vibration isolation performance of the system in multiple dimensions.