Rail Transit Vibration Testing Platform Using Hemi-Anechoic Chamber

Solution Overview

Problem

Current methods for evaluating vibration and noise reduction in rail transit are either time-consuming and costly due to on-site field tests or suffer from inaccuracies in reduced-scale model experiments, which fail to isolate external noise and vibration effectively, leading to errors in testing wheel-rail radiation noise and vibration.

Innovation Solution

A system platform combining a hemi-anechoic chamber with a run-through tunnel and a simulated track for a reduced-scale train, creating a hemi-free field environment that isolates external noise and allows for accurate testing of wheel-rail radiation noise and vibration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If on-site field tests are conducted with actual line structures before and after vibration reduction measures, then measurement accuracy is improved, but loss of time and experimental cost increase significantly

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidtime consumption

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent creates a virtual copy of the actual rail transit system through high-fidelity numerical modeling. The virtual model replicates the physical system's dynamic characteristics, allowing accurate evaluation of vibration reduction measures without conducting time-consuming physical field tests. This copying approach maintains measurement accuracy while dramatically reducing time consumption.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical field test system with a computational simulation system. Instead of physically constructing line structures and conducting on-site tests, the invention uses numerical models and computer-based simulations to evaluate vibration reduction effectiveness, thereby eliminating the time and resource requirements of physical testing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If on-site field tests are conducted with actual line structures, then measurement accuracy is improved, but experimental cost increases significantly

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidexperimental cost

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent creates a virtual copy of the actual rail transit system through high-fidelity numerical modeling. The virtual model replicates the physical system's dynamic characteristics, allowing accurate evaluation of vibration reduction measures without conducting time-consuming physical field tests. This copying approach maintains measurement accuracy while dramatically reducing time consumption.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical field test system with a computational simulation system. Instead of physically constructing line structures and conducting on-site tests, the invention uses numerical models and computer-based simulations to evaluate vibration reduction effectiveness, thereby eliminating the time and resource requirements of physical testing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of time

If reduced-scale model experiments are used to lower cost and increase flexibility, then loss of time and cost are reduced, but measurement precision deteriorates due to inability to isolate external noise and vibration

Engineering Contradiction:

Improvetime consumptionVSAvoidmeasurement accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent creates a virtual copy of the actual rail transit system through high-fidelity numerical modeling. The virtual model replicates the physical system's dynamic characteristics, allowing accurate evaluation of vibration reduction measures without conducting time-consuming physical field tests. This copying approach maintains measurement accuracy while dramatically reducing time consumption.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent creates a controlled virtual environment that isolates the system from external disturbances. The numerical simulation environment acts as an inert atmosphere, eliminating the influence of external noise and vibration that plague physical reduced-scale models, thereby enabling accurate measurement of wheel-rail radiation noise and vibration without environmental interference.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

4Adaptability or versatility

If reduced-scale model experiments are used to lower cost and increase flexibility, then experimental flexibility is improved, but measurement precision deteriorates due to inability to provide hemi-free field environment

Engineering Contradiction:

Improveexperimental flexibilityVSAvoidmeasurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent creates a virtual copy of the actual rail transit system through high-fidelity numerical modeling. The virtual model replicates the physical system's dynamic characteristics, allowing accurate evaluation of vibration reduction measures without conducting time-consuming physical field tests. This copying approach maintains measurement accuracy while dramatically reducing time consumption.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent creates a controlled virtual environment that isolates the system from external disturbances. The numerical simulation environment acts as an inert atmosphere, eliminating the influence of external noise and vibration that plague physical reduced-scale models, thereby enabling accurate measurement of wheel-rail radiation noise and vibration without environmental interference.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 platform enables precise evaluation and research of vibration and noise reduction technologies by providing a controlled environment for reduced-scale trains, maximizing space utilization, and ensuring accurate testing of wheel-rail radiation noise and vibration, thus improving the development of rail transit systems.

Implementation Method 1

hemi-anechoic chamber...isolate the influence of external noise and vibration

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Implementation Method 2

run-through tunnel...providing a simulated track for the running of a reduced-scale train

Methodology Applied

Scientific EffectMechanical transmission:

Data Source

PatentUS20240211648A1System platform for evaluation and research and development of vibration and noise reduction technology for rail transit

Publication Date: 2024.06.27 BEIJING JIAOTONG UNIV

AI summary

Disclosed is a system platform for evaluation and research and development of vibration and noise reduction technology for rail transit, including a hemi-anechoic chamber, a run-through tunnel, a simulated track, and a reduced-scale train running on the simulated track. The run-through tunnel is enclosed by sound insulation and absorption boards. The side wall of the hemi-anechoic chamber is provided with a door opening; the exit of the run-through tunnel communicates with the door opening, and the entrance of the run-through tunnel is arranged at the end part, away from the hemi-anechoic chamber, of the run-through tunnel. The simulated track is continuously arranged into the hemi-anechoic chamber from the outside of the run-through tunnel via the entrance, the exit and the door opening.