High-Speed Vehicle-Bridge Aerodynamic Testing System
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Solution Overview
Problem
Conventional wind tunnel tests are inadequate in simulating the effect of crosswind on high-speed moving vehicle-bridge systems and the relative motion between trains and their environment, posing safety risks due to increased sensitivity to wind loads.
Innovation Solution
A system comprising a vehicle model, starting mechanism, buffer mechanism, and wind tunnel test section with guide rails, where the starting mechanism uses a high-speed servo motor and rotating conveyor belt to accelerate the vehicle model to 100 km/h, and the buffer mechanism decelerates it using flexible plates and brake friction devices, allowing for realistic simulation of aerodynamic characteristics under crosswind conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wind tunnel tests are used, then the test setup is simple, but they cannot effectively simulate the effect of crosswind on the moving vehicle-bridge system and the relative motion between trains and the surrounding environment
Solution Approach 1:
The patent implements a moving vehicle-bridge system where the vehicle model can move along the bridge model at high speed (up to 100 km/h) while the wind tunnel generates crosswind. This dynamic setup allows simulation of relative motion between the vehicle, bridge, and wind, significantly improving the accuracy of aerodynamic characteristic measurement compared to static conventional wind tunnel tests.
Solution Approach 2:
The test system integrates multiple functions into a unified platform: it can simulate crosswind conditions, vehicle motion at various speeds, and the interaction between vehicle-bridge-aerodynamics. The system serves both as a wind tunnel and a moving vehicle test track, reducing the need for separate test facilities while improving simulation comprehensiveness.
2Reliability
If the vehicle model is accelerated to high speed (100 km/h) to simulate real operating conditions, then the test realism improves, but the requirements for the starting mechanism and safety controls increase
Solution Approach 1:
The starting mechanism is designed to accelerate the vehicle model to the required test speed (up to 100 km/h) before it enters the test section. This preliminary acceleration ensures that the vehicle reaches realistic operating conditions before aerodynamic testing begins, improving test reliability while isolating the high-speed mechanism from the measurement system.
Solution Approach 2:
The buffer mechanism is positioned at the end of the track to decelerate and stop the vehicle model after testing. This beforehand cushioning ensures safe stopping of the high-speed vehicle model, preventing damage to the test system and maintaining safety while allowing realistic high-speed testing.
3Weight of moving object
If lightweight vehicle structures are used to reduce weight by 50%, then fuel efficiency improves, but the vehicles become more sensitive to wind loads and safety risks increase
Solution Approach 1:
The patent uses scaled model vehicles that replicate the lightweight structure characteristics of modern high-speed trains. By testing these models in a controlled wind tunnel environment, researchers can study the aerodynamic effects on lightweight structures and optimize designs to reduce wind load sensitivity before full-scale production, thereby maintaining weight reduction benefits while improving safety.
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
The system effectively simulates the aerodynamic characteristics of high-speed trains on bridges under crosswind, providing high test accuracy, reducing design costs, and improving safety by accurately replicating real operating conditions, with the ability to freely adjust crosswind speed and model shapes.
Implementation Method 1
the starting mechanism uses a high-speed servo motor and rotating conveyor belt to accelerate the vehicle model to 100 km/h
Implementation Method 2
the starting mechanism uses a high-speed servo motor and rotating conveyor belt to accelerate the vehicle model to 100 km/h
Implementation Method 3
the buffer mechanism decelerates it using flexible plates and brake friction devices
Implementation Method 4
the buffer mechanism decelerates it using flexible plates and brake friction devices
Implementation Method 5
wind tunnel test section with guide rails, where the starting mechanism uses a high-speed servo motor and rotating conveyor belt to accelerate the vehicle model to 100 km/h
Implementation Method 6
allowing for realistic simulation of aerodynamic characteristics under crosswind conditions
Data Source
AI summary
A system for testing aerodynamic characteristics of a high-speed moving vehicle-bridge system and subsidiary facilities thereof under a crosswind includes a vehicle model, a starting mechanism, a buffer mechanism, a wind tunnel test section and guide rails. The guide rails pass through the wind tunnel test section; the starting mechanism and the buffer mechanism are separately located at both ends of the guide rails. The guide rails include an acceleration section and a deceleration section. The starting mechanism is located in the acceleration section, and the buffer mechanism is located in the deceleration section; the vehicle model starts to run at the starting mechanism and stops at the buffer mechanism; an instantaneous speed of the vehicle model in the acceleration section is not less than 100 km/h. The present invention carries out simulation tests on various infrastructures, their subsidiary facilities and trains through scale models.