Tire Testing Carriage Assembly for Dynamic Slip Angle Simulation
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Solution Overview
Problem
Current tire testing machines are inadequate for simulating the dynamic loads and slip angles required for FMVSS-126 regulatory testing, and they lack the capability to emulate high-speed racing conditions, as well as providing accurate data for various terrains and surfaces, which is essential for ensuring vehicle safety and performance.
Innovation Solution
A tire testing system with a carriage assembly constrained to five degrees of freedom, coupled with dedicated actuators for each degree of motion, and a rail system that allows for precise control of slip ratio and dynamic loading, enabling simulation of real-world driving and racing conditions, including different terrains and surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current tire testing machines are used, then basic tire performance can be measured, but they are inadequate for simulating dynamic loads and slip angles required for FMVSS-126 regulatory testing
Solution Approach 1:
The testing system transitions from static to dynamic measurement capabilities by implementing real-time force and moment measurement during tire rotation. The system dynamically adjusts measurement parameters to capture transient loading conditions, slip angle variations, and dynamic force components that occur during actual driving maneuvers, enabling accurate simulation of FMVSS-126 regulatory test conditions.
Solution Approach 2:
The testing machine is enhanced to perform multiple functions: it can conduct both static tire performance measurements and dynamic regulatory compliance testing (FMVSS-126). The system integrates capabilities to measure fundamental tire parameters as well as complex dynamic responses under varying load conditions, slip angles, and rotation speeds, making it versatile for different testing requirements.
2Reliability
If multiple prototype vehicles are built for testing, then comprehensive safety data can be collected, but the process becomes very expensive and time-consuming
Solution Approach 1:
The system creates a virtual copy of vehicle-tire interaction through high-fidelity measurement and simulation. By accurately capturing force and moment data from a single physical tire test, the system generates comprehensive safety performance data that replicates what would otherwise require multiple prototype vehicles. The measured dynamic responses are used to validate computational models, enabling virtual testing and reducing physical prototyping requirements.
Solution Approach 2:
The system replaces the need for multiple physical prototype vehicles with an enhanced measurement and simulation approach. Instead of building and testing multiple mechanical prototypes, the system uses precise force and moment measurements combined with computational analysis to predict vehicle safety performance, substituting physical prototyping with a hybrid measurement-simulation methodology.
3Speed
If current tire testing machines are used, then simple static measurements can be taken, but they lack the capability to emulate high-speed racing conditions
Solution Approach 1:
The testing system is designed to operate dynamically at high rotation speeds to emulate racing conditions. The force and moment measurement capabilities are optimized to capture transient loading at elevated speeds, with measurement systems that can accurately resolve dynamic force components during high-speed tire rotation, enabling realistic simulation of racing performance and safety evaluation.
4Measurement precision
If current tire testing machines are used, then basic performance data can be obtained, but they lack accurate measurement capabilities for various terrains and surfaces
Solution Approach 1:
The testing system is designed to universally measure tire performance across different terrains and surface conditions. The force and moment measurement capabilities are configured to accurately capture tire-surface interaction forces under varying normal loads and slip conditions, enabling precise measurement of tire performance on different surfaces through controlled testing procedures.
Data Source
AI summary
A manipulator assembly for moving and displacing a tire undergoing tire testing, including: a linear actuator for moving and displacing the tire along a local vertical z-axis; a linear actuator for moving and displacing the tire along a local lateral y-axis that is substantially perpendicular to the local vertical z-axis; a rotary actuator for cambering the tire within a local coordinate system partially defined by the local vertical z-axis and the local lateral y-axis; and a linear actuator for moving and displacing the tire along a global lateral y-axis that is substantially perpendicular to the local vertical z-axis such that the local coordinate system is moved and displaced along the global lateral y-axis. Specifically, the linear actuator for moving and displacing the tire along the global lateral y-axis moves and displaces an origin of the local coordinate system along the global lateral y-axis.