Six-DOF Micro Vibration Platform with Active Passive Isolation
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Solution Overview
Problem
Current micro vibration suppression technologies face challenges with complex structures, high power consumption, and limited frequency response, particularly in achieving effective low-frequency vibration suppression and precise control, especially in space applications.
Innovation Solution
A six-degree-of-freedom micro vibration suppression platform with a cube-shaped configuration of single-degree-of-freedom active and passive composite vibration isolation devices, utilizing piezoelectric actuators, mechanical amplification members, and dynamic force sensors, connected through a controller for real-time active control, allowing for adjustable stiffness and enhanced damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If active and passive parallel mechanism of air spring and voice coil motor is used, then large stroke and high load capability are achieved, but structure becomes complicated and power consumption increases
Solution Approach 1:
The patent merges the active voice coil motor and passive air spring into a single integrated vibration isolation unit, where the motor piston rod directly connects to the air spring assembly. This combination achieves both large stroke (from air spring) and high load capability (from motor) while reducing overall structural complexity compared to separate systems.
Solution Approach 2:
The vibration isolation unit serves multiple functions simultaneously: the voice coil motor provides active control force, the air spring provides passive isolation and large stroke capability, and together they handle both high-frequency attenuation and low-frequency isolation. This multi-functionality eliminates the need for separate systems for each function.
2Speed
If active and passive parallel mechanism of metal spring and linear motor is used, then lower natural frequency is achieved, but mounting precision requirement increases and control precision enhancement becomes difficult
Solution Approach 1:
The patent uses adjustable air spring stiffness parameters to achieve the desired lower natural frequency without requiring high mounting precision. The air spring's inherent compliance allows for parameter adjustment through pressure control, enabling natural frequency tuning while maintaining ease of installation and control precision.
3Speed
If piezoelectric ceramics actuator is used, then high frequency response and high positioning precision are achieved, but actuation stroke becomes smaller
Solution Approach 1:
The patent combines the piezoelectric actuator (providing high frequency response and positioning precision) with a mechanical amplification mechanism (providing stroke multiplication). The piezoelectric motor drives a screw mechanism or lever system that amplifies the small piezoelectric displacement into a larger actuation stroke, achieving both high frequency response and sufficient stroke.
4Measurement precision
If piezoelectric actuator is used, then high positioning precision is achieved, but structural stiffness increases making it a hard structure with too high natural frequency
Solution Approach 1:
The patent adjusts the structural parameters of the piezoelectric actuator assembly, particularly the stiffness of supporting elements and mounting configurations, to reduce overall structural stiffness. This allows the system to maintain high positioning precision from the piezoelectric sensor while achieving a lower natural frequency suitable for vibration isolation applications.
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 platform achieves effective suppression of micro vibrations across a wide frequency band, including low-frequency vibrations, with reduced natural frequency and increased control precision, suitable for precise machining and measurement devices in micro vibration environments.
Implementation Method 1
the active vibration isolation assembly includes a piezoelectric actuator, a mechanical amplification member
Implementation Method 2
a mechanical amplification member, and a dynamic force sensor... the mechanical amplification member is used for amplifying the motion stroke of the piezoelectric actuator
Implementation Method 3
the active vibration isolation assembly includes... a dynamic force sensor... the dynamic force sensor measuring a vibration force signal in an axial direction of the single-degree-of-freedom active and passive composite vibration isolation device
Implementation Method 4
the passive vibration isolation assembly includes a metal spring
Implementation Method 5
a passive vibration isolation assembly... allowing for adjustable stiffness and enhanced damping characteristics
Data Source
AI summary
A six-degree-of-freedom micro vibration suppression platform includes a basic platform, a load platform, six sets of single-degree-of-freedom active and passive composite vibration isolation devices that are exactly the same and a controller. Upper and lower ends of each set of single-degree-of-freedom active and passive composite vibration isolation devices are connected with the load platform and the basic platform, respectively. A control method includes: calculating a logical axis signal, calculating a logical axis control signal, calculating physical axis real-time control signals and a transfer step.