Rolling Tire Deformation Detection Using Speed-Normalized Spectral Signals
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Solution Overview
Problem
Existing tire deformation measurement systems are prone to disturbances from external forces and noise, making it difficult to accurately determine tire deformation under varying conditions.
Innovation Solution
A method involving attaching sensors to tires, acquiring initial time-domain signals during rolling, normalizing and angularly resampling these signals using a reference speed, and performing spectral analysis to determine tire deformation as a scalar or vector invariant under external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are mounted on the tire to measure deformation during rolling, then deformation data can be obtained, but the measurement signals are disturbed by external forces and noise
Solution Approach 1:
The patent extracts and removes disturbing components from the measurement signal through signal processing. Specifically, it separates the deformation signal from noise and external force influences by analyzing frequency components and eliminating those corresponding to known disturbance sources, thereby obtaining a cleaned deformation measurement.
Solution Approach 2:
The patent introduces signal processing algorithms as an intermediary between the sensor and the final measurement result. These algorithms act as a mediator that processes the raw sensor data, filters out disturbances, and extracts the meaningful deformation information, resolving the contradiction between obtaining deformation data and avoiding noise.
2Measurement precision
If signal processing is applied to remove disturbances, then measurement precision improves, but processing complexity increases
Solution Approach 1:
The patent segments the signal processing into distinct stages: initial signal acquisition, disturbance identification, frequency-based filtering, and final deformation extraction. This segmentation allows each processing step to be optimized independently and makes the overall complex process more manageable and implementable.
Data Source
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AI summary
Disclosed is a method for ascertaining the deformation of a tyre, the method comprising the following steps: – fastening a sensor, which is capable of generating a signal representative of movement of the sensor, to the tyre; – acquiring (201) a temporal wheel rotation signal SigTDR (101) comprising the amplitude of the acceleration while rolling; – determining a reference speed Wreference (202) associated with a portion of the wheel rotation signal SigTDR; – normalising (203) the portion of the wheel rotation signal SigTDR by a magnitude that is a function F of Wreference; – angularly resampling (204) the portion of the wheel rotation signal SigTDR; – obtaining the spectral signal (205) of the portion of the normalised and angularly resampled wheel rotation signal SigTdR; – defining a spectral magnitude (206); – identifying the deformation of the tyre Def% (207) as a function G of the spectral magnitude.