Air Spring Displacement Diagnostic for Railway Shock Absorbers
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Solution Overview
Problem
Existing diagnostic technologies for railway vehicle shock absorbers require additional sensors to accurately detect abnormalities, increasing cost and system complexity.
Innovation Solution
An operation state diagnostic device that uses existing sensors to measure pressure and position data, calculates and estimates vertical displacement using a railway vehicle model, and compares these values to determine shock absorber abnormalities without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are added to accurately detect shock absorber abnormalities, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses existing sensors (acceleration sensors, pressure sensors, position sensors) that serve their primary functions for vehicle control and stability, while simultaneously utilizing their data for shock absorber abnormality detection. This self-service approach eliminates the need for dedicated abnormality detection sensors, reducing device complexity while maintaining measurement precision through multi-purpose data utilization
Solution Approach 2:
The existing sensor network is designed to serve multiple functions: vehicle body attitude control, bogie vibration suppression, and shock absorber health monitoring. By making the sensor system universal, the patent avoids adding specialized sensors for abnormality detection, thereby reducing system complexity while achieving accurate measurement through correlated analysis of multi-functional sensor data
2Measurement precision
If additional sensors are added to accurately detect shock absorber abnormalities, then measurement precision is improved, but cost increases
Solution Approach 1:
The existing sensor infrastructure performs dual roles by simultaneously monitoring vehicle dynamics and detecting shock absorber abnormalities. This eliminates the need for additional dedicated sensors, reducing both the quantity of sensors required and the associated costs while maintaining high measurement precision through sophisticated data correlation algorithms
Solution Approach 2:
The sensor system is designed to be multi-functional, using the same acceleration, pressure, and position sensors for both primary vehicle control functions and shock absorber abnormality detection. This universality reduces the total sensor quantity needed, thereby lowering system cost while achieving accurate abnormality detection through integrated data analysis
3Measurement precision
If vibration-based detection methods are used to diagnose shock absorber abnormalities, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The vibration detection system leverages existing acceleration sensors that are already installed for vehicle stability control. By analyzing vibration patterns from these existing sensors in correlation with pressure and position data, the system achieves precise shock absorber abnormality detection without adding specialized vibration measurement devices, thus avoiding increased device complexity
Solution Approach 2:
The acceleration sensors serve dual purposes: primary vehicle vibration control and shock absorber abnormality detection through vibration pattern analysis. This multi-functionality allows the system to achieve precise vibration-based diagnosis without adding dedicated vibration sensors, thereby maintaining simplicity in the detection system architecture
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 enhances the accuracy of shock absorber abnormality detection while minimizing the need for additional measurement means, thereby reducing costs and system complexity.
Implementation Method 1
a pressure measurement unit configured to measure a pressure value of pressure loaded on a spring mechanism provided between the vehicle body and the bogie
Implementation Method 2
a spring mechanism provided between the vehicle body and the bogie
Data Source
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AI summary
Provided is an operation state diagnostic device including a spring displacement calculation unit, a spring displacement estimation unit, and a damper abnormality determination unit. The spring displacement calculation unit uses a pressure value of an air spring output from a pressure sensor to calculate a vertical displacement of the air spring as an "air spring displacement ΔX." The spring displacement estimation unit uses a railway vehicle model, position information of a position sensor, and the pressure value of the air spring to estimate the vertical displacement of the air spring as an "air spring displacement estimation value ΔXc." The damper abnormality determination unit determines an abnormality by comparing the "air spring displacement ΔX" calculated by the spring displacement calculation unit and the "air spring displacement estimation value ΔXc" estimated by the spring displacement estimation unit with each other.