Ball Screw Vibration Monitoring for Noise-Resistant Wear Detection
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Solution Overview
Problem
Existing methods for monitoring the state of a ball screw face challenges in noise resistance due to noise components generated at production sites, making it difficult to accurately determine the pre-load and wear using vibration signals in the low frequency band from 10 Hz to 10 kHz.
Innovation Solution
A state determination device and method that generates and processes vibration information by acquiring and averaging first and second vibration information in different periods, removing nonstationary and periodic components, and calculating noise-resistant third vibration information to improve determination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration monitoring is performed in the low frequency band from 10 Hz to 10 kHz to detect pre-load changes, then the ability to detect pre-load degradation is improved, but noise resistance deteriorates due to noise components generated at the production site
Solution Approach 1:
The patent applies preliminary action by acquiring vibration signals during an initial first period when the ball screw is presumed to be in a normal state with proper pre-load. This preliminary vibration information is stored and later used as a reference during the second period for state determination, enabling comparison to detect pre-load degradation while filtering out consistent noise components
Solution Approach 2:
The patent implements feedback by comparing vibration information from the current second period against the reference vibration information from the first period. The determination unit uses this comparative feedback to detect changes in pre-load and rolling element state, continuously monitoring the ball screw's condition over time
2Measurement precision
If vibration signals are acquired and processed to determine the state of the ball screw, then the ability to detect wear and pre-load changes is improved, but the complexity of the processing system increases due to multi-period acquisition and averaging operations
Solution Approach 1:
The patent applies segmentation by dividing the vibration monitoring process into distinct time periods: a first period for acquiring reference vibration information when the system is presumed normal, and a second period for acquiring current vibration information for state determination. This temporal segmentation simplifies the processing logic by creating clear phases with different objectives
Solution Approach 2:
The patent uses partial action by selectively applying averaging processing only to periodic vibration components that need to be removed, rather than processing all vibration signal aspects. The determination unit focuses on comparing specific frequency components and characteristics between periods, performing only the necessary processing operations required for state determination
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
Enhances noise resistance and improves the accuracy of determining the degree of wear in ball screws by reducing uncorrelated noise components and maintaining pre-load integrity.
Implementation Method 1
a vibration signal acquired by a vibration sensor during operation of the ball screw
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a state determination device and a state determination method for a ball screw capable of improving noise resistance. Included are: a vibration information generating unit (201) that generates vibration information indicating a relationship between a nut position of the ball screw and a frequency-vibration level characteristic that varies depending on to the nut position on the basis of a vibration signal acquired by a vibration sensor (21) during operation of the ball screw; and a determination unit (202) that executes state determination processing of the ball screw on the basis of first vibration information generated on the basis of a vibration signal acquired in a first period and second vibration information acquired in a second period after the first period.