Variable Stiffness Isolator With Quasi-Zero-Stiffness Adjustment
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Solution Overview
Problem
Existing variable stiffness systems suffer from limited frequency range, slow response time, and require external energy sources, with performance deteriorating at higher excitation levels and narrow vibration damping ranges.
Innovation Solution
A variable stiffness system with equal positive and negative stiffness sections, allowing for quasi-zero-stiffness adjustment and fast response time, utilizing a wire to transmit axial load through a beam group with adjustable tension, enabling wide frequency operation and minimal adjustment force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the excitation level of the isolator is increased, then the load capacity is improved, but the performance of the isolator deteriorates
Solution Approach 1:
The patent implements a variable stiffness mechanism that dynamically adjusts the stiffness of the isolator based on the excitation level. The stiffness can be changed from a first value to a second value, allowing the system to adapt to different load conditions and maintain optimal performance across a wide range of excitation levels, thereby resolving the contradiction between load capacity and performance.
2Object-affected harmful factors
If vibration dampers are used to dampen vibrations, then vibration isolation is improved, but the operating frequency range is restricted to a narrow range
Solution Approach 1:
The patent employs a variable stiffness mechanism that allows the stiffness to be adjusted dynamically. This enables the vibration isolator to maintain effective vibration isolation across a wide frequency range by adapting its stiffness characteristics to match different operating frequencies, overcoming the limitation of fixed-frequency vibration dampers.
Solution Approach 2:
The patent changes the stiffness parameter of the isolator to optimize performance at different frequencies. By varying the stiffness from a first value to a second value, the system can effectively isolate vibrations across a broad frequency spectrum rather than being limited to a narrow resonant frequency.
3Speed
If the stiffness of the system is changed rapidly, then the response time is improved, but the adjustment force required increases
Solution Approach 1:
The patent implements a variable stiffness mechanism with a control system that can rapidly adjust the stiffness of the isolator. The mechanism is designed to achieve fast stiffness changes while managing the adjustment force requirements through intelligent control strategies and mechanical design.
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 system achieves rapid stiffness changes with minimal force, wide frequency operation, and enhanced vibration isolation and absorption capabilities, addressing limitations of existing systems.
Implementation Method 1
Based on its Euler buckled beams and negative stiffness mechanism
Implementation Method 2
the stiffness of the positive stiffness section and the negative stiffness section are provided to be equal
Implementation Method 3
at least one compression spring located at the point where the central axis intersects said spring bottom plate and is connected to the spring bottom plate
Implementation Method 4
at least one wire connected to the wire compression channel at the free end of said beam group and to the spring upper plate located on the compression spring
Data Source
AI summary
A variable stiffness system used as both a vibration isolation system and a vibration absorption system in systems ensures the protection of vibration-sensitive mechanical, optical, and electronic devices from vibration in industrial activities, and is also used as a variable stiffness spring or joint in robotic and biomedical fields.