Rail Bogie Positioning in Test Stands
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Solution Overview
Problem
Current test procedures for rail vehicle bogies lack the precision and reproducibility needed to accurately assess the geometric data and wheel contact force distribution, which is critical for ensuring driving comfort and safety, especially at higher transit speeds.
Innovation Solution
A method and device for automatically positioning bogies in a test stand using height-adjustable entry tracks, multiple positioning units with receiving prisms and integrated measuring devices, and a central control unit to correct and align the bogie's position precisely, ensuring even wheel contact force distribution and geometric accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual positioning methods are used for bogies in test stands, then the setup process is simpler, but the positioning precision and reproducibility are insufficient
Solution Approach 1:
The patent replaces manual mechanical positioning with an automated measurement and correction system. Distance sensors automatically measure the positions of running wheels relative to receiving prisms, and the control unit calculates and applies correction values to positioning units, eliminating manual intervention and achieving micrometer-level precision.
Solution Approach 2:
The positioning system performs self-positioning through automatic measurement and correction. The distance sensors measure actual positions, the control unit calculates correction values, and the positioning units automatically adjust their positions based on these corrections, enabling the system to self-correct without external intervention.
2Manufacturing precision
If high-precision positioning systems are implemented, then measurement accuracy improves, but the complexity of the test stand increases
Solution Approach 1:
The positioning system is divided into independent positioning units, each responsible for a specific running wheel. Each positioning unit includes its own distance sensor and correction mechanism, allowing independent measurement and adjustment. This segmentation enables high precision for each wheel while keeping individual unit complexity manageable.
Solution Approach 2:
The positioning units are designed as universal, interchangeable components that can be used for all running wheels of the bogie. Each positioning unit performs multiple functions: supporting the running wheel, measuring its position with a distance sensor, and applying corrections. This multi-functionality reduces overall system complexity by using standardized components.
3Reliability
If automated positioning correction is implemented, then positioning reproducibility improves, but the time required for positioning increases
Solution Approach 1:
The system performs preliminary measurement of the actual positions of running wheels before final positioning. Distance sensors measure positions in advance, the control unit calculates correction values beforehand, and then the positioning units are adjusted based on these pre-calculated corrections. This preliminary action ensures reproducible positioning while streamlining the overall process.
Solution Approach 2:
The positioning system uses feedback from distance sensors to continuously monitor and correct the positions of running wheels. The sensors provide real-time position data, the control unit processes this feedback to calculate corrections, and the positioning units apply adjustments based on this feedback loop, ensuring high reproducibility.
Data Source
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AI summary
The method involves measuring an X-position of each of positioning units (6) opposite to a deviation of a position of an upper X-slide from a position of a lower X-slide of the respective positioning unit as an actual position by a measuring device. A correction variable for an accurate X-position of the positioning units opposite to a bogie wheel (3) in a test stand (1) is detected and stored as a target position by a control unit based on the measured X-position. Each positioning unit is adjusted exactly into the target position based on a preset signal of the control unit. An independent claim is also included for a device for positioning a test specimen in a test stand for a rail vehicle.