Shock Absorber Degradation Detection via Hysteresis Analysis
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Solution Overview
Problem
It is challenging to determine the degradation level of vehicle shock absorbers, leading to unnecessary replacement and potential operational risks, as existing methods lack accurate prediction of their functional status.
Innovation Solution
A method that determines the functional status of a vehicle shock absorber by measuring the difference in force values during compression and expansion, using a predetermined threshold based on previous measurements of a new shock absorber, and analyzing the hysteresis effect to assess degradation, which can be implemented during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shock absorber replacement is based on pre-set intervals, then replacement is performed regularly, but the shock absorber may be replaced before necessary, causing unnecessary waste and loss of functional components
Solution Approach 1:
The patent replaces the mechanical/time-based replacement system with a sensor-based detection system that measures force values during compression and expansion cycles. Sensors (acceleration sensors, force sensors) detect the actual functional status of the shock absorber by measuring hysteresis effects, substituting the need for scheduled replacement with condition-based assessment.
Solution Approach 2:
The system implements feedback by continuously monitoring force values during shock absorber operation and comparing them against reference values from new shock absorbers. The control unit receives sensor signals, determines degradation levels based on hysteresis analysis, and provides feedback on the functional status, enabling replacement only when actually needed.
2Reliability
If shock absorber degradation is difficult to determine, then replacement timing is uncertain, but this leads to operational risks and potential vehicle damage
Solution Approach 1:
The patent utilizes the natural vibration and oscillation of the shock absorber during compression and expansion cycles to generate measurable force variations. By analyzing the hysteresis loop formed during these dynamic cycles, the system detects degradation without requiring the shock absorber to be stationary or subjected to extreme conditions.
Solution Approach 2:
The patent introduces sensors as intermediary devices that indirectly measure shock absorber degradation. Instead of directly observing wear and tear, the system uses acceleration sensors and force sensors to detect changes in force values during operation, translating physical degradation into measurable electrical signals that can be analyzed by the control unit.
3Duration of action of stationary object
If shock absorber replacement is delayed beyond optimal timing, then component lifetime is extended, but vibration-sensitive components may be damaged due to insufficient damping
Solution Approach 1:
The control unit continuously monitors force values and compares them against predetermined thresholds and reference values from new shock absorbers. When the hysteresis analysis indicates degradation exceeds acceptable levels, the system provides feedback signaling that replacement is needed, ensuring timely intervention before vibration damage occurs to other components.
Solution Approach 2:
The system substitutes subjective judgment or fixed schedules with objective sensor-based measurement and automated control unit analysis. This enables precise determination of the optimal replacement point, extending service life maximally while maintaining adequate damping performance through data-driven decision making.
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 method allows for accurate determination of shock absorber degradation, reducing unnecessary replacements and improving the operational lifetime of vibration-sensitive components by providing timely indications for replacement.
Implementation Method 1
shock absorber arrangement arranged between a frame and a wheel axle of a vehicle, the vehicle shock absorber arrangement being compressible and expandable during operation for absorbing motions from the wheel axle
Implementation Method 2
the so called hysteresis effect has an impact on the function of the shock absorber, whereby the hysteresis can be evaluated and analyzed for determining degradation of the shock absorber
Data Source
AI summary
The present invention relates to a method for determining a functional status of a vehicle shock absorber arrangement (100). The method determines a difference between force values during compression and expansion of the vehicle shock absorber arrangement (100), whereby the shock absorber arrangement (100) can be determined to be degraded if the difference is below a predetermined threshold.