Loaded Vehicle Tire Test Bench for Pressure Oscillation Prediction
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Solution Overview
Problem
Existing methods for determining tire properties do not account for fluid oscillations, particularly air pressure oscillations, which are crucial for tire performance and safety, especially in high-speed applications.
Innovation Solution
A method and test bench that predict pressure oscillations by rotating a vehicle tire on a test bench rim, pressurizing it with fluid, and recording forces using Fourier transformation to analyze tire speed and frequency, allowing for the detection of fluid and tire oscillations, and comparing data sets generated with and without a test bench rim to simulate real-world conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for determining tire properties are used, then the measurement process is simple, but the measurement precision is insufficient because fluid oscillations are not accounted for
Solution Approach 1:
The measurement system is segmented into distinct functional components: a test bench rim for supporting the tire, a wheel bearing for rotation, force sensors for detecting oscillations, and a control unit for coordinating measurements. This segmentation allows each component to be optimized independently while collectively achieving comprehensive measurement of both tire and fluid oscillations.
Solution Approach 2:
The wheel bearing acts as an intermediary element that transmits oscillations from the tire and fluid to the force sensors. By positioning the sensors on the wheel bearing, the system indirectly measures the oscillations of the tire and air fluid without direct contact, simplifying the measurement setup while maintaining precision.
2Reliability
If tire testing is performed without considering fluid oscillations, then the testing process is fast, but the reliability of tire performance prediction is reduced
Solution Approach 1:
The system performs preliminary measurements of the tire's mechanical properties and oscillation characteristics before final performance assessment. By pre-characterizing the tire's response to oscillation excitation and comparing it against reference data, the system can quickly determine suitability for specific vehicle applications without requiring extensive time-consuming testing.
Solution Approach 2:
The control unit continuously monitors the force sensor signals and compares them against reference data sets to provide real-time feedback on tire performance. This feedback mechanism allows for rapid assessment of whether the tire meets required criteria, reducing overall testing time while maintaining high reliability through systematic comparison with reference standards.
3Ease of operation
If a test bench rim is used instead of a vehicle rim, then the ease of operation is improved, but the measurement precision may be affected due to different rolling behavior
Solution Approach 1:
The test bench rim is designed to replicate the essential mechanical characteristics of a vehicle rim as closely as possible. By copying the structural properties and loading conditions, the system enables accurate measurement of tire oscillations while maintaining the operational advantages of a controlled test bench environment. The wheel bearing system further enhances this copying by simulating realistic rotational loads and contact conditions.
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 prediction and classification of tire performance by analyzing fluid and tire oscillations, ensuring compliance with safety and performance criteria for various vehicle types, reducing testing time and improving reliability.
Implementation Method 1
the fluid reacts to the oscillation excitation with a pressure oscillation
Implementation Method 2
a force acting from the vehicle tire due to the pressure oscillation on the wheel bearing is continuously recorded
Implementation Method 3
a data set describing the force over the tire speed and over a frequency is generated by subjecting a time signal of the speed ramp to a Fourier transformation
Data Source
AI summary
A test bench and a method to predict pressure oscillations in a vehicle tire. The tire is rotatably positioned, via a bearing on a test bench rim, the tire is pressurized with fluid, a load is applied on the tire, the tire is accelerated according to pre-determinable speed ramp to a final speed, the fluid in accordance with the tire speed, undergoes an oscillation excitation, and reacts to the oscillation excitation with a pressure oscillation. The method is characterized in that an effective force of the tire, due to the pressure oscillation, at the bearing is continuously detected, and that a descriptive data set is determined for the tire speed over the frequency, a timing signal of the speed ramp undergoes a Fourier transformation and, in an analogous manner, a reference data set is created through the use of a vehicle rim instead of the test bench rim.