Electric Multiple Unit Gear Transmission Testing Under Wheel-Rail Excitation
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Solution Overview
Problem
Existing experimental systems for gear transmission of electric multiple units cannot simulate the wheel-rail excitation environment, leading to increased failure rates due to external factors like wheel polygon and track irregularity.
Innovation Solution
An experimental system and method that includes a platform base plate, gear transmission experimental table, load and drive motors, double-cross splined universal couplings, bearing seats, and excitation devices to simulate wheel-rail excitation by applying sinusoidal vibrations, allowing for the acquisition of dynamic responses and stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing experimental systems are used for gear transmission of electric multiple units, then no-load load experiments can be carried out, but wheel-rail excitation environment cannot be simulated
Solution Approach 1:
The patent transforms the static experimental platform into a dynamic simulation system by introducing vibration exciters that can apply wheel-rail excitation forces. The platform base plate is designed to vibrate in multiple directions (vertical, horizontal, longitudinal) to simulate real operating conditions, enabling the gear transmission system to experience dynamic loads similar to actual service environments.
Solution Approach 2:
The patent introduces an intermediary vibration excitation system between the test platform and the gear transmission system. The vibration exciters act as mediators that generate controlled wheel-rail excitation forces, allowing researchers to study the system's response to simulated operational conditions without requiring actual field testing.
2Device complexity
If wheel-rail excitation is not simulated, then experimental setup is simple, but failure rate increases due to external factors like wheel polygon and track irregularity
Solution Approach 1:
The patent segments the excitation system into independent vibration exciters for different directions (vertical, horizontal, longitudinal). Each exciter can be controlled separately to simulate specific wheel-rail excitation components, allowing flexible configuration of test scenarios while maintaining a manageable system structure.
Solution Approach 2:
The experimental platform is designed with multi-functionality to perform both no-load/load experiments and wheel-rail excitation simulation. The same platform base plate and support structures serve dual purposes: providing mechanical support for the gear transmission system and serving as the vibration transmission medium for simulating wheel-rail excitation conditions.
3Measurement precision
If wheel-rail excitation simulation is added, then working conditions can be truly simulated, but device complexity increases
Solution Approach 1:
The patent merges the vibration excitation system with the existing experimental platform structure. The vibration exciters are integrated into the platform base plate and support structures, combining the measurement and simulation functions into a unified system rather than adding separate independent systems.
Solution Approach 2:
The patent enables precise control of vibration parameters (frequency, amplitude, direction) to accurately simulate different wheel-rail excitation conditions. By adjusting these parameters, the system can reproduce various operating scenarios including wheel polygon effects and track irregularities, achieving high simulation accuracy.
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 accurately simulates the wheel-rail excitation environment, enabling true simulation of the gear transmission system's working conditions, thereby reducing failure rates and enhancing experimental research in this field.
Implementation Method 1
Sinusoidal excitation is output by the excitation device according to a frequency required by an experiment along a vertical direction to knock the platform base plate
Data Source
AI summary
An experimental system and a method for simulating a gear transmission of an electric multiple unit under wheel-rail excitation are provided. The experimental system includes a gear transmission experimental table and an excitation device. Under the action of the excitation device, the electric multiple unit gear transmission experimental table carries out no-load and load experiments of a gear transmission system to simulate the dynamic characteristic change of the gear transmission system under the wheel-rail excitation environment. The basic experiments of the gear transmission system of the electric multiple unit can be carried out, the wheel-rail excitation received by the gear transmission system during operation of the electric multiple unit can also be simulated, thus making up the vacancy of the experimental researches in the field of electric multiple unit transmission considering the environmental conditions of wheel-rail excitation in China.