RAILWAY

 

ICR has placed itself in a relevant position as an acoustic engineer in the international railway sector during the last decades, thanks to the trust placed on the main European rolling stock manufacturers.

 

Work Procedure

 

The working methodology used is based on techniques of forecasting close to home, on measurements of real shifts and vibrations that allow minimizing the theoretical speculation. The ability to tract both the aeri soroll and the structural soroll of each element (subsystem) that forms the train and in time of response, including not only the contribution of forces (Transfer Path Analysis) but also the quantification of the paths of soroll and vibrations (Advanced Transfer Path Analysis).  This service meant a considerable reduction of waste in the new train model.

 

It is necessary to point out that a typical train and quantified characteristics of the fonts used to make the matérix slings, ICR is developing a numerical model that allows both the prediction of the level of slings and vibrations of a new train model as well as the calculation of the solutions to be applied in order to reduce the level of slings to the interior.

 

Services

Some of the services offered are:
-Advanced transfer path analysis (TPA and ATPA) of noise and vibration.
-Vibro-acoustic contribution of each train element to measured noise at a point in the interior.
-Vibro-acoustic contribution of auxiliary equipment to the train interior noise.
-Influence of airflow separation on internal noise.
-Influence of turbulent boundary layer pressure on internal noise.
-Theoretical and experimental models for predicting rolling noise.
-Theoretical and experimental models for predicting the compression wave generated by an incoming high-speed train in a tunnel.
-Theoretical and experimental models for predicting Squeal noise.
-Theoretical and experimental models for predicting impact noise.
-Theoretical and experimental models for predicting aerodynamic noise in high-speed trains.
-Software development made to measure by vibroacoustic analysis.
-Fluid dynamic calculations (CFD). Aeroacoustic calculations (CAA).
-Dynamic and vibroacoustic calculations FEM and BEM.
-Forecasting of the acoustic environmental impact due to train passage.
-Custom design of mufflers and acoustic solutions......

Projects

+ Acoustic study and protocol measurements of 4,000 train units (C4K) for NIR (North Ireland Railways). CAF, Construcciones y Auxiliar de Ferrocarriles.
Acoustic study and protocol measurements of 4,000 train units (C4K) for NIR (North Ireland Railways). CAF, Construcciones y Auxiliar de Ferrocarriles.
Development of a numerical model of airborne noise and acoustic forecasting to determine the future compliance of the new units in accordance with TSI Rolling Stock-Noise 2006/66/EC, UK regulations and customer requirements. Performing protocol and post-process measurements: measurement of RASTI according to IEC60268-16 standards and measurements of internal, external and cabin noise both aerial and structural.
+ Research project 'EVS (Equipments Vibration Specification)' to design and develop a tool that specifies maximum noise and vibration levels of the equipment installed on trains. Alstom Transport.
Research project EVS (Equipments Vibration Specification) to design and develop a tool that specifies maximum noise and vibration levels of the equipment installed on trains. Alstom Transport
Predict structural noise levels within a realistic range of uncertainties. Given a maximum SPL, specify the maximum vibration levels measured under certain conditions. Based on an experimental measure (results from numerical models are also considered).
+ Study of noise and vibration transmission pathways for the very high-speed train prototype (AGV). Alstom Transport.
Study of noise and vibration transmission pathways for the very high-speed train prototype (AGV). Alstom Transport.
Execution of static and dynamic vibroacoustic measurements in the high-speed train to process, according to TPA methodology, each of the noise and vibration sources of the train and its contribution to total noise.
+ Creation of a tailor-made software. Ineco Tifsa.
Creation of a tailor-made software. Ineco Tifsa.
Realization of a software for treatment, frequency analysis and visualization of bridge vibration signals. Main functions: synthesis and application of all types of digital filters, polynomial or spline-based interpolations, signal resampling, conversion of data formats, project mode management of all signals, determination of the main frequencies and associated damping, calculation of residual and stabilized values, etc. The software includes massive data processing and customized summary report generation subprograms.
+ Experimental Modal Analysis in the drive system of ADR diesel units. CAF, Construcciones y Auxiliar de Ferrocarriles.
Experimental Modal Analysis in the drive system of ADR diesel units. CAF, Construcciones y Auxiliar de Ferrocarriles.
Development of an Experimental Modal Analysis to know the different real modes that exist and participate in the movement of the assembly that form the support frame elastically joined to the car, the powertrain assembly, and the turbocharger assembly that the engine has attached.
+ Study of the influence of flow separation and pressure fluctuations of the turbulent boundary layer on the acoustic power of the windscreen of the new generation of AGV (Automotrice à Grande Vitesse) high-speed trains, France. Alstom Transport.
Study of the influence of flow separation and pressure fluctuations of the turbulent boundary layer on the acoustic power of the windscreen of the new generation of AGV (Automotrice à Grande Vitesse) high-speed trains, France. Alstom Transport.
Elaboration of an acoustic study of aerodynamics generated by noise and excitation of mechanisms in the new high-speed train. The study is divided into three main parts: cabin noise due to aerodynamic glass excitation, cabin noise due to the ventilation system and finally, noise in the passenger area behind the cabin.
+ Design of a silencer for the stale air outlet of the Rome Metro, and performance of a comparison of sound insulation between three types of subway doors, provided by the customer. CAF, Construcciones y Auxiliar de Ferrocarriles.
Design of a silencer for the stale air outlet of the Rome Metro, and performance of a comparison of sound insulation between three types of subway doors, provided by the customer. CAF, Construcciones y Auxiliar de Ferrocarriles.
Design of silencing elements needed to reduce the noise level generated by the stale air extraction system located in a drawer under the seat of the Rome Metro. Carrying out an acoustic study of three different door designs carried out with the multiple insulation calculation program, dBKAisla developed by ICR, in order to compare its acoustic insulation.
+ Complete acoustic study of the Northern Ireland Diesel Train. Model and study of motor coupling by FEM. CAF, Construcciones y Auxiliar de Ferrocarriles.
Complete acoustic study of the Northern Ireland Diesel Train. Model and study of motor coupling by FEM. CAF, Construcciones y Auxiliar de Ferrocarriles.
Acoustic Study of Diesel units for N. I. R. based on calculation of rolling noise, noise levels and determination of solutions to reduce train vibrations caused by the auxiliary engine. Description of the results of the model carried out in order to evaluate the predictions of the sound pressure level inside NIR diesel trains.
+ Complete acoustic study of the Xin Min Line train from the Republic of China. Alstom Transport.
Complete acoustic study of the Xin Min Line train from the Republic of China. Alstom Transport.
Carrying out vibro-acoustic tests on a similar train including an analysis of the train's noise and vibration transmission pathways and measurements of equipment and components. A
lateri, realization of a numerical Model in order to predict the noise and vibrations of the new one.
Xin Mine Line model train. Monitoring of the manufacture of the first unit of the new model and vibro-acoustic test to check the estimated prediction. Redesign of the cabin doors and intercommunication train.