Rail Bogie Test Bench Lateral Force Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing test stands for rail vehicle bogies face challenges in maintaining accurate geometry and force distribution measurements due to deformation under operating load, leading to unstable positioning and potential damage from lateral forces.
Innovation Solution
The solution involves measuring and controlling horizontal force components on the wheel mounting devices and force generators, using strain gauges on weighing beams to determine and minimize transverse forces, ensuring precise and safe measurements by adjusting the bogie's position to reduce lateral forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bogie is loaded with operating load via power generators to simulate the weight of the scales, then the geometry of the bogie can be tested when it is loaded, but the bogie geometry can change as a result of deformation, which can affect the positioning of the bogie on the test stand
Solution Approach 1:
The patent implements a feedback mechanism where horizontal force components measured by strain gauges are continuously monitored and used to adjust the bogie position. The control system processes the measured horizontal forces and automatically shifts the bogie to minimize these forces, creating a closed-loop control system that maintains measurement accuracy despite deformation under load.
Solution Approach 2:
The system uses the measurement data from the strain gauges to automatically adjust its own positioning. The bogie positioning is self-correcting based on the measured horizontal forces, eliminating the need for external intervention or manual repositioning during the test process.
2Adaptability or versatility
If the wheels are allowed to move freely under operating load, then the free mobility of the wheel contact points can be achieved, but unstable positional relationships occur due to resulting lateral forces, which lead to lateral movement of the bogie and increase in lateral forces and positioning errors
Solution Approach 1:
The patent dynamically adjusts the horizontal position of the bogie based on measured lateral forces. By changing the positional parameter in response to measured forces, the system maintains both wheel mobility and bogie stability, allowing the wheels to move freely while preventing unstable positional relationships through active position control.
3Measurement precision
If force sensors under the mounting prisms measure how the operating load is distributed over the individual wheels, then uneven force distributions can be detected, but the measurement accuracy is impaired by lateral forces and unstable support
Solution Approach 1:
The patent uses feedback from horizontal force measurements to actively compensate for lateral forces during vertical force measurements. The control system minimizes lateral forces by adjusting bogie position based on strain gauge readings, thereby improving the accuracy of vertical force distribution measurements on the wheels.
Solution Approach 2:
The strain gauges measuring horizontal forces act as an intermediary system that detects lateral forces and triggers position adjustments. This intermediary measurement system enables the main vertical force measurements to be performed accurately by eliminating the harmful lateral force 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 enhances measurement accuracy and safety by constraining lateral forces, preventing positioning errors and damage, thus providing reliable geometric and force data.
Implementation Method 1
The force on the wheels can be measured, for example, by means of a balance beam, in which a strain gauge is present at two spaced locations. The wheel contact points are in the middle between the two strain gauges. The force in the vertical direction can be measured relatively precisely via the deformation of the weighing beam, which is recorded by the strain gauges.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a test bench for bogies of a rail vehicle and to a method for testing the bogie of a rail vehicle, in which transverse forces occurring during the simulation of an operating load are measured and minimized.