Multi-Axis Chassis Component Dynamic Testing
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Solution Overview
Problem
Current testing systems for motor vehicle chassis components use low frequency and single-axis methods, which fail to accurately model real-life driving conditions, leading to unrealistic vibrational responses and noise issues.
Innovation Solution
A system and method that utilize a support structure with fixtures, a shaker system, and multi-axis dynamic force transducers to impart high frequency inputs (above 20 Hz) and measure force transmission across chassis components, replicating real-world conditions by positioning a chassis component between fixtures and using multi-axis dynamic force transducers with at least 3 DOF sensing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If low frequency and single-axis testing systems are used to measure chassis component interactions, then the testing system is simpler and easier to operate, but the accuracy of modeling real-life driving conditions deteriorates
Solution Approach 1:
The patent transitions from single-axis testing to multi-axis testing by introducing force transducers with 3-degree-of-freedom sensing capability. This dimensional expansion allows measurement of forces in multiple directions simultaneously, accurately capturing the complex multi-directional vibrations experienced by chassis components during real driving conditions
Solution Approach 2:
The patent changes the frequency parameter from low frequency to high frequency (greater than about 20 Hz) to better represent actual road conditions. This parameter change ensures that the testing system captures high-frequency vibrational responses that occur during real vehicle operation, improving the fidelity of the measurements
2Measurement precision
If high frequency multi-axis testing systems are used to accurately model real-life driving conditions, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent employs a multi-axis force transducer that performs multiple measurement functions simultaneously. The single transducer device is capable of measuring forces in three orthogonal directions and three rotational moments, replacing what would otherwise require multiple separate sensing devices, thereby managing complexity while achieving comprehensive measurement capability
Solution Approach 2:
The patent introduces a controller as an intermediary that coordinates the shaker system and processes data from multiple force transducers. This centralized control mechanism simplifies the operation of the complex multi-axis testing system by automatically establishing frequency inputs and monitoring force transmission across the chassis component
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 allows for accurate determination of high frequency multi-degree of freedom dynamic properties of chassis components, effectively reducing road noise transmission by simulating actual road conditions and providing detailed dynamic properties like dynamic stiffness, loss function, and force transmissibility.
Implementation Method 1
The shaker system is operable to impart a frequency greater than about 20 Hz to the chassis component
Implementation Method 2
The first multi-axis dynamic force transducer includes at least a 3 degree of freedom (DOF) sensing capability
Data Source
AI summary
A system for determining dynamic properties of a chassis component includes a first fixture, a second fixture spaced from the first fixture, and a chassis component arranged between the first and second fixtures. The chassis component has a first end arranged at the first fixture and a second end arranged at the second fixture. A shaker system is arranged at the first end of the chassis component. A first multi-axis force transducer is arranged between the shaker system and the chassis component. The first multi-axis force transducer includes at least a 3 degree of freedom (DOF) sensing capability. A second multi-axis force transducer is arranged between the second end of the chassis component and the second fixture. The second multi-axis force transducer includes at least a 3 degree of freedom (DOF) sensing capability. A controller is coupled to the shaker system, and the first and second multi-axis dynamic force transducers.