Tire Crown Bending Frequency Detection via Phase Analysis
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Solution Overview
Problem
Vibrations of tire crowns on coarse roads lead to undesired noise in vehicles, and existing methods lack an effective way to determine the frequencies associated with these vibrations, which are critical for identifying noise-causing tire conditions.
Innovation Solution
A system and method that includes a vibration generating device to excite vibrations in the tire and a vibration sensing arrangement to detect these vibrations at multiple points, using phase differences to determine the frequency associated with tire crown bending, allowing for the identification of noise-producing frequencies without the need for road tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If road tests are conducted to identify noise-causing tire frequencies, then accurate frequency determination is achieved, but time consumption and testing complexity increase significantly
Solution Approach 1:
The patent applies preliminary action by conducting frequency determination tests on tire samples in a controlled laboratory environment before actual road tests. The vibration generator excites the tire crown at various frequencies, and sensors measure the resulting vibrations to identify resonant frequencies that cause noise. This preliminary characterization allows engineers to predict noise behavior without extensive road testing, significantly reducing time loss while maintaining measurement precision.
2Measurement precision
If extensive road testing is performed to identify tire vibration frequencies, then comprehensive noise characterization is achieved, but device complexity and testing resources increase
Solution Approach 1:
The patent extracts the essential frequency determination function from complex road testing by isolating the tire as a separate test object in a controlled environment. A vibration generator directly excites the tire crown, and sensors mounted on the tire measure vibrations without requiring the entire vehicle system. This extraction simplifies the testing system while maintaining the ability to accurately characterize noise-causing frequencies.
3Ease of operation
If traditional vibration testing methods are used without phase difference analysis, then testing simplicity is maintained, but frequency determination accuracy decreases
Solution Approach 1:
The patent replaces traditional mechanical vibration testing with an electrical signal-based measurement system. Sensors convert mechanical vibrations into electrical signals, and a computer analyzes phase differences between signals from multiple sensors to precisely determine resonant frequencies. This substitution maintains ease of operation through automated analysis while significantly improving frequency determination accuracy compared to traditional mechanical measurement methods.
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
Enables accurate determination of tire crown bending frequencies, reducing unwanted noise in vehicles by identifying specific frequencies that cause vibrations, thereby allowing for targeted tire design improvements without the need for extensive road testing.
Implementation Method 1
a vibration sensing arrangement configured to sense vibrations at a plurality of sensing points on the tire
Implementation Method 2
a vibration generating device configured to excite vibrations through a tire
Data Source
AI summary
Methods and systems are provided for determining frequencies associated with tire crown bending. The system includes a vibration generating device configured to excite vibrations through a tire. The system further includes a vibration sensing arrangement configured to sense vibrations at a plurality of sensing points on the tire. A computer is in communication with the vibration sensing arrangement and configured to determine a first frequency associated with bending of the crown of the tire based at least partially on phase differences between the sensed vibrations at the plurality of points on the tire.