Inerter-Based Skyhook Damping Vibration Isolation
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Solution Overview
Problem
Conventional passive vibration isolation systems face challenges in harmonizing resonant response and high-frequency attenuation, requiring external energy input, complex structures, and poor reliability, while active and semi-active systems struggle with real-time performance and increased mass due to the need for a damper connected to an inertial reference frame.
Innovation Solution
A passive skyhook and groundhook damping vibration isolation system utilizing an inerter-based 'inerter-spring-mass' vibration state converting system to convert resonance into the inerter, eliminating the need for a damper connection to an inertial reference frame, and providing a method to determine optimal suspension parameters for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ideal skyhook damping system is implemented with a damper connected to an inertial reference frame, then resonant response is attenuated, but the structure becomes complex and mass increases
Solution Approach 1:
The patent introduces an inerter as an intermediary element between the mass and the damper. The inerter creates a pseudo-inertial reference frame through its unique mechanical property of generating a force proportional to the relative acceleration between its terminals. This allows the damper to function as a skyhook damper without requiring direct connection to the inertial reference frame, thus achieving the desired vibration isolation performance while maintaining structural simplicity
Solution Approach 2:
The patent replaces the traditional mechanical connection to the inertial reference frame (which would require complex structures) with an inerter-based mechanical substitution. The inerter effectively substitutes the role of the inertial reference frame by generating equivalent inertial forces through its terminal acceleration, enabling the skyhook damping effect without the need for actual inertial frame connection
2Reliability
If active or semi-active implementation ways are used to achieve skyhook damping, then vibration isolation effect is improved, but external energy input is required and reliability decreases
Solution Approach 1:
The patent implements a passive skyhook damping system that is self-sufficient and does not require external energy input. The inerter automatically generates the necessary inertial forces based on its terminal acceleration, and the damper dissipates energy passively through its damping characteristic. This self-service mechanism eliminates the need for sensors, actuators, and control systems required in active and semi-active systems, thereby improving reliability while avoiding external energy dependencies
Solution Approach 2:
The patent utilizes the mechanical vibration properties of the inerter-spring-mass system to achieve skyhook damping. By carefully selecting the inerter mass and spring stiffness parameters, the system creates a dynamic response that mimics the ideal skyhook damping behavior, allowing passive energy dissipation through the damper without requiring active control or external energy input
3Reliability
If a dynamic vibration absorber is used in passive skyhook vibration isolation system, then resonant response is suppressed, but mass of the system increases
Solution Approach 1:
The patent changes the fundamental parameters of the vibration isolation system by introducing the inerter element. Instead of using a traditional dynamic vibration absorber with significant mass, the inerter provides an inertial effect with much smaller actual mass. The key parameter is the inerter coefficient (b), which represents the ratio of force to relative acceleration, allowing the system to achieve resonant response suppression with minimal added mass
Solution Approach 2:
The patent applies local quality by concentrating the inertial function in a specific component (the inerter) rather than distributing mass throughout the system. The inerter is strategically placed in the vibration isolation chain between the mass and the damper, providing targeted inertial resistance at the critical location where it is most needed for resonant response suppression, while keeping the overall system mass low
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 effective vibration isolation close to ideal skyhook and groundhook damping without external energy input, simplifying the structure, enhancing reliability, and reducing mass-related conflicts, while significantly improving vibration isolation performance compared to conventional passive systems.
Implementation Method 1
utilizing an inerter-based 'inerter-spring-mass' vibration state converting system to convert resonance into the inerter
Implementation Method 2
The damper may span and be connected in parallel to the inerter... to absorb the vibration energy of the mass
Data Source
AI summary
A passive skyhook and groundhook damping vibration isolation system and a method for determining parameters thereof, which utilize the anti-resonance of an “inerter (b1, b2)-spring (k1, k2)-mass (m1, m2)” vibration state converting system to convert the resonance of the isolated mass into the resonance of the inerter, thus eliminating the resonance of the isolated mass, is provided. A damper spans and is connected in parallel to the inerter, preventing the damper from spanning and being connected in parallel to the isolated mass. The damper is not required to connect to an inertial reference frame, and the vibration of the isolated mass is suppressed.