Nonlinear Inertia Vibration Isolation for Lower Resonant Frequency
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Solution Overview
Problem
Existing vibration suppression systems, such as traditional linear passive vibration isolators and nonlinear quasi-zero stiffness passive isolators, face limitations in effectively controlling vibrations in engineering systems, leading to reduced accuracy and service life of precision equipment.
Innovation Solution
The development of a nonlinear inertia-based anti-vibration system that features an adjustable arrangement of support members and weighted members, allowing for various nonlinear inertia forms and improved vibration isolation performance by adapting the equivalent mass/inertia in response to input vibration excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear passive vibration isolators are used, then the system structure is simple, but the vibration suppression performance is insufficient
Solution Approach 1:
The patent applies the dynamics principle by transforming the static linear stiffness characteristic into a dynamic nonlinear stiffness characteristic. The support members are configured to rotate about joints, creating a mechanism where the stiffness changes dynamically with the amplitude of vibration excitation. This allows the system to adapt its vibration suppression performance to different operating conditions, resolving the contradiction between simple structure and effective suppression.
Solution Approach 2:
The patent implements parameter changes by making the equivalent stiffness and equivalent mass of the vibration isolation system variable rather than constant. Through the geometric configuration of support members and weighted members, the system parameters change in response to input vibration excitation, enabling improved suppression performance across different vibration amplitudes while maintaining a relatively simple mechanical structure.
2Reliability
If nonlinear quasi-zero stiffness passive isolators are used, then the vibration isolation performance is improved, but the system becomes more complex and less adaptable
Solution Approach 1:
The patent uses the dynamics principle to create a system where the support members rotate about joints, transforming static nonlinear stiffness into dynamic adaptive stiffness. This rotational mechanism allows the system to automatically adjust its characteristics in response to different vibration excitation amplitudes, achieving both improved isolation performance and enhanced adaptability to varying vibration conditions.
Solution Approach 2:
The patent applies segmentation by dividing the vibration isolation function into multiple rotational joints and support members. Each joint and support member contributes to the overall nonlinear inertia effect, allowing the system to achieve complex adaptive behavior through simpler modular components, thereby improving both performance and adaptability.
3Reliability
If the equivalent mass is increased to improve vibration suppression, then the damping characteristics improve, but the resonant frequency decreases
Solution Approach 1:
The patent applies the dynamics principle by making the equivalent mass variable through the rotational motion of weighted members about joints. As the vibration excitation amplitude changes, the effective equivalent mass changes dynamically, allowing the system to achieve improved damping characteristics at larger amplitudes while the resonant frequency naturally adjusts, resolving the trade-off between damping and resonant frequency.
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 anti-vibration system achieves enhanced vibration isolation performance by generating nonlinear inertial forces, which adaptively change the equivalent mass of the system, leading to improved damping characteristics and reduced resonant frequencies.
Implementation Method 1
generating nonlinear inertial forces, which adaptively change the equivalent mass of the system
Data Source
AI summary
An anti-vibration system is provided that includes a first support structure including a first support member and a second support member coupled to the first support member at a first joint such that the first and second support members are each rotatable about the first joint. The first support member and the second support member cross over one another at the first joint. A third support member is coupled to the first and second support members and is rotatable about an axis extending through the first joint. A first weighted member is disposed at a first end portion of the third support member.