Magnetic Suspension Sensing System for Absolute Pose Measurement

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Solution Overview

Problem

Existing vibration measurement technologies face challenges in accurately measuring low-frequency vibrations due to noise interference, error accumulation, and limited ability to measure high-degree-of-freedom motions, especially in industrial applications where a static reference point is difficult to find, leading to inefficiencies in vibration control and isolation.

Innovation Solution

A magnetic suspension type sensing system utilizing quasi-zero stiffness electromagnetic mechanisms to create a static reference platform, enabling accurate measurement of space full-degree-of-freedom vibration poses through a combination of positive and negative stiffness units and eddy current sensors, allowing for wide frequency band measurement and high sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional relative vibration measuring methods are used, then installation is simplified, but measurement accuracy deteriorates because a static reference point cannot be found when machine base and foundation vibrate together

Engineering Contradiction:

Improveinstallation easeVSAvoidmeasurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces a magnetic suspension reference platform as an intermediary device that creates a virtual static reference point in the vibration environment. This reference platform uses magnetic suspension to isolate itself from the vibrating machine base, providing a stable reference for measuring absolute vibration of the rotor, thereby resolving the contradiction between ease of installation and measurement accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If acceleration signals are accumulated to obtain displacement, then measurement is simplified, but error accumulation increases in the long-time process

Engineering Contradiction:

Improvemeasurement method complexityVSAvoidmeasurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces the mathematical integration method (accumulating acceleration signals) with a direct mechanical measurement approach. By using the magnetic suspension reference platform to directly measure absolute displacement through electromagnetic force balance, the system avoids the error accumulation inherent in multi-step signal integration while maintaining measurement simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If a magnetic suspension reference platform is introduced, then measurement accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidsystem structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The magnetic suspension reference platform performs multiple functions simultaneously: it provides a stable reference point, measures absolute vibration, and isolates itself from base vibration. This multi-functionality justifies the added complexity by consolidating multiple measurement and isolation functions into a single integrated device.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Reliability

If low-frequency active vibration control is implemented, then vibration control effect is improved, but measurement time delay and error accumulation occur

Engineering Contradiction:

Improvevibration control effectivenessVSAvoidmeasurement time delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The magnetic suspension reference platform performs preliminary action by establishing an accurate absolute vibration measurement baseline before vibration control is applied. This pre-measurement of true absolute vibration characteristics enables more effective control strategy development and reduces the need for iterative adjustments that cause time delays.

Inventive Principle:

Principle #10Preliminary action

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 accurate, real-time measurement of space full-degree-of-freedom vibration poses with high adaptability and long service life, reducing noise interference and error accumulation while maintaining high sensitivity and dynamic flexibility.

Implementation Method 1

The positive stiffness unit and the negative stiffness unit are electromagnetic mechanisms generating electromagnetic forces F+ and F- respectively

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

deformation of each supporting leg is obtained through eddy current sensors

Methodology Applied

Scientific EffectEddy current: Eddy Currents

Data Source

PatentUS11692607B2Magnetic suspension type sensing system for space full-degree-of-freedom absolute poses

Publication Date: 2023.07.04 CHONGQING UNIV

AI summary

A magnetic suspension type sensing system for space full-degree-of-freedom absolute poses is provided. The system includes a reference platform, multiple quasi-zero stiffness supporting legs and a platform to be tested. The reference platform and the platform to be tested are connected in a spherical hinge mode through the multiple quasi-zero stiffness supporting legs. Each of the multiple quasi-zero stiffness supporting legs includes a lower end spherical hinge, a lower end cover, a positive stiffness unit, a negative stiffness unit, a shaft, a lower end shell, an upper end shell and an upper end spherical hinge.