Rolling Device Lubrication Diagnosis Using Impedance and Phase Angle
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Solution Overview
Problem
Existing methods for diagnosing the lubrication state in rolling devices require numerous parameters that are difficult to set uniquely, leading to high calculation loads and complexity.
Innovation Solution
A method involving the application of an AC voltage to an electric circuit comprising rolling elements and peripheral members, measuring impedance and phase angle, and using simplified formulas to derive an evaluation value for lubrication state diagnosis, including formulas such as 1/R = l * kn * cos(θ) and 1/C = -kn * l * ω * sin(θ), where R and C represent resistance and reactance at one contact point per rolling element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the method in Patent Literature 1 is used to calculate lubricating film thickness and metal contact ratio, then the lubrication state can be diagnosed, but many parameters are required and it is difficult to uniquely set them, increasing device complexity and ease of operation issues
Solution Approach 1:
The patent extracts only the essential parameters (impedance and phase angle) needed for lubrication state diagnosis, eliminating the need for numerous difficult-to-set parameters from the related art. By focusing on these two key measurable quantities, the method achieves accurate diagnosis while significantly reducing parameter complexity and setting difficulty.
2Measurement precision
If the method in Patent Literature 1 is used to calculate lubricating film thickness and metal contact ratio, then the lubrication state can be diagnosed, but many parameters are required, increasing the processing load and time consumption
Solution Approach 1:
The patent extracts and uses only the essential parameters (impedance and phase angle) for lubrication state diagnosis, eliminating the need to process numerous other parameters. This extraction approach significantly reduces calculation load and processing time while maintaining diagnosis accuracy, thereby improving overall diagnostic efficiency and productivity.
3Ease of operation
If simplified diagnosis methods are used, then the processing load is reduced and ease of operation is improved, but measurement precision may be compromised
Solution Approach 1:
The patent changes the measurement parameters from complex multi-parameter calculations to direct measurement of impedance and phase angle. This parameter transformation enables a simplified diagnostic method that is easier to operate while maintaining high measurement precision, as these two parameters directly reflect the lubrication state without requiring complex computations or additional parameter settings.
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
This approach allows for simpler and more efficient lubrication state diagnosis by reducing processing load and enabling real-time diagnosis without requiring complex parameter settings, particularly in conditions where parameters like dielectric constant or rotational speed are unknown.
Implementation Method 1
measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied
Implementation Method 2
measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied
Data Source
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AI summary
This method for diagnosing a rolling device in which rolling elements and peripheral members are lubricated using a lubricant includes: applying an alternating-current voltage to an electric circuit comprising the rolling elements and the peripheral members; measuring an impedance and a phase angle of the electric circuit when the alternating-current voltage is applied; deriving an evaluation value representing a lubrication state inside the rolling device, using a calculation formula defined by the measured impedance and phase angle, an angular frequency of the alternating-current voltage, the number of rolling elements in the rolling device, and the number of contact points; and using the evaluation value to diagnose the lubrication state of the rolling device.