Tire Contact Property Measurement Using Rotating Drum Sensor
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Solution Overview
Problem
Conventional methods for measuring tire ground contact properties at high speeds are limited in detail, as they average measurements across the tire's circumferential direction, failing to provide a detailed assessment of ground contact properties at each location on the tread pattern.
Innovation Solution
A method and apparatus using a three-component force sensor embedded in a rotating drum that contacts multiple locations on the tire's tread surface, allowing for precise measurement of ground contact pressure, width direction shear stress, and circumferential shear stress at specific positions, enabling detailed distribution analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a three-component force sensor is used to measure ground contact properties at multiple locations, then measurement precision is improved, but the ability to identify specific position information is lost due to averaging
Solution Approach 1:
The patent divides the measurement process into discrete segments by associating each force measurement with specific position information. The measurement results are segmented by tread pattern location, allowing detailed analysis of ground contact properties at each position rather than averaging across all positions.
Solution Approach 2:
The patent implements feedback by using position detection means to continuously monitor and record the location where force measurements are taken. This position information is fed back into the measurement system to correlate force data with specific tread pattern locations, enabling identification of local characteristics.
2Speed
If a rotating drum with embedded measurement unit is used, then high-speed measurement capability is improved, but detailed position identification on the tire tread surface deteriorates due to random contact positions
Solution Approach 1:
The patent uses position detection means that continuously monitor and record the location where force measurements are taken on the rotating drum. This feedback mechanism associates each force measurement with specific position information on the tire tread, enabling detailed position identification even during high-speed rotation.
Solution Approach 2:
The patent replaces mechanical position marking systems with detection means that optically or electronically identify tread pattern positions. This substitution allows for precise position detection without mechanical contact, maintaining measurement speed while improving position identification accuracy.
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 provides detailed ground contact property distributions and identifies local slip sites, aiding in tire design improvements to reduce wear and squealing, while maintaining high-speed measurement capabilities.
Implementation Method 1
a three-component force sensor capable of measuring the ground contact pressure, the width direction shear stress, and the circumferential shear stress of the tire
Data Source
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AI summary
A tire (T) for measurement, having applied thereto a required camber angle (CA) and slip angle (SA), is contacted against a rotatably driven rotating drum (1) having embedded therein a three-component force sensor (measurement unit 3) capable of measuring ground contact pressure (P), width direction shear stress (τx), and circumferential shear stress (iy) (properties) of the tire (T). The rotating drum (1) and tire (T) are rotated and the tire (T) is passed over the three-component force sensor (3) multiple times. The tire (T) properties are measured multiple times, and the tire circumferential direction position of each measurement point is identified. A ground contact pressure distribution, width direction shear stress distribution, and circumferential shear stress distribution in a contact region of the tire (T) with the rotating drum (1) are obtained by repeating measurement and identification while displacing the tire (T) along the rotation axis of the rotating drum (1).