Multi-Directional Low-Frequency Actuator for Ultra-Stable Vibration Isolation
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Solution Overview
Problem
Existing vibration isolation technologies face challenges in achieving ultra-low-frequency vibration control due to trade-offs between dynamic stiffness and static deformation, and they often suffer from actuator distortion and limited robustness.
Innovation Solution
An ultra-stable multi-directional low-frequency actuator is designed, featuring a baseplate, bearing plate, connecting mechanism, and executing mechanisms with high-static low-dynamic spring dampers, vertical and horizontal executers, elastic components, and sensing components, which enable six-degree-of-freedom actuation and real-time control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inherent frequency of the system is reduced to improve ultra-low-frequency vibration control efficiency, then dynamic stiffness is improved, but static deformation increases due to reduced static stiffness
Solution Approach 1:
The patent employs actively controllable spring dampers that can dynamically adjust their stiffness characteristics. The spring damper includes a damping element and a controllable force generation mechanism that allows real-time modification of the force-displacement relationship, enabling the system to optimize between dynamic stiffness and static deformation support based on operational conditions
Solution Approach 2:
The patent changes the physical parameters of the spring damper system by introducing active force control. The controllable mechanism modifies the effective stiffness parameter dynamically, allowing the system to achieve low dynamic stiffness for vibration control while maintaining high static stiffness for deformation support through parameter adjustment
2Reliability
If traditional active vibration isolation technology is used to achieve low-frequency vibration isolation, then vibration control is improved, but actuator distortion occurs at extremely low frequencies
Solution Approach 1:
The patent replaces traditional active actuators with a passively operating spring damper system that incorporates active control through force control. This substitution eliminates the need for low-frequency actuators that suffer from distortion, as the spring damper operates passively while the control system manages the force distribution to achieve vibration isolation
3Strength
If the actuator is designed with large static stiffness to ensure bearing capacity and stability, then static deformation is reduced, but dynamic stiffness increases which reduces ultra-low-frequency vibration control efficiency
Solution Approach 1:
The spring damper system incorporates active force control that allows dynamic adjustment of stiffness characteristics. During static conditions, the system maintains high stiffness for bearing capacity, while during vibration events, the control system modifies the force-displacement relationship to reduce dynamic stiffness, enabling the same component to satisfy both requirements through temporal differentiation
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 actuator achieves stability, reliability, and robustness while effectively controlling ultra-low-frequency vibrations, avoiding actuator distortion, and maintaining simplicity in structure and assembly.
Implementation Method 1
both ends of a lower part of the support leg are connected with the baseplate through one high-static low-dynamic spring damper
Implementation Method 2
one high-static low-dynamic spring damper and one vertical executer which are arranged in parallel
Implementation Method 3
one horizontal executer and one elastic component are arranged in parallel between each of both sides of the lateral support seat and the first groove
Data Source
AI summary
Provided is an ultra-stable multi-directional low-frequency actuator, including a baseplate, a bearing plate, a connecting mechanism, and two executing mechanisms symmetrically arranged on the baseplate about a Y axis. Both ends of a lower part of the support leg are connected with the baseplate through one high-static low-dynamic spring damper and one vertical executer arranged in parallel, respectively. Both ends of an upper part of the support leg are provided with one sensing component, respectively. A horizontal executer and an elastic component are arranged in parallel between each of both sides of a lateral support seat and a first groove, and sensing components corresponding to the horizontal executers one by one are arranged at an inner side of the support leg. The connecting mechanism is configured to connect two support legs, both ends of the bearing plate are mounted at the upper parts of the two support leg.