SARDOU SA

RAILWAYS BACKGROUND

Home Company profile Innovation & Technology Others products Services Customers Production Technical papers Contact

RAILWAYS BACKGROUND

Quality Industrial Product is a French Company wich study, design and manufacture Low Noise Fans and others special products.

Our company has developed a numerical model in order to compute fan performances.

As we have observed lack of noise efficient prediction tool, we have aimed to an integrated model, which enable us to fully optimize fan, pressure and noise wise.

Our technical papers show some examples of our model optimization features.

1. INTRODUCTION.

All fans models that are presented in literature are either developed in order to compute : pressure versus mass flow, or in order to try to predict noise power level at working point. There is no efficient engineering tool witch can be interactively used in order to help designer to converge toward optimum fan.

Goal of our work, started in 1992, was to develop such missing tool.

2. SPECIFICATIONS.

We wanted to develop a simulation package which will give us " at a glance ", all informations needed in order to analyze performances of a fan ; and will enable us to optimize it by, parametricaly, shifting mains engineering details of the fan.

3. NUMERICAL SIMULATION SENSITIVITY.

Numerical simulation, we have developed, fulfill the engineering need which is : " what happen if I modify such and such parameter ".

We have validated our program with many fans and we are now able to study centrifugal as wells as axial flow fans


Eurostar Train testing with SARDOU MS9 Fan

4. EXAMPLE OF THE TRAIN EUROSTAR FAN TESTING

This measurements are done on a complete air circuit simulation including cooler, plenum and roof simulation.

Fourier analysis of MS9.

We observe a tone at 630 hz with a value of 82.2 dB Lin. First harmonic is more than 10 dB smaller than the tone !

Fourier analysis of INITIAL FAN.

We observe a tone at 196 Hz with a power of 103.8 dB Lin. First harmonic is very close at about 2 dB Lin. Broad band is high for INITIAL FAN compared to MS9.

MS9 sum up to 93.2 dB A ; INITIAL FAN sum up to 102,4 dB A, which give an advantage of 9.2 dBA to MS 9 versus INITIAL FAN on complete circuit simulation comparison.

MS9 Fans prototypes for Eurostar

The point is that, EUROSTAR integration is very turbulent, so we have had to reduce performances of our fan in order to cope with turbulence. We have produced a fan MS9, which was saving 9.2 dBA in the train package.

Two of these fans has been successfully train tested. And we found same value on train than on bench testing.