Transportation applications

When it comes to public transportation lots of tests and measurements are required to ensure safety and passenger comfort. The trains for example require many measurements during development phase, first measurements when they come in operation and repetitive measurements for determining the quality of the tracks. High number of channels distributed over the long vehicles can be easily achieved with the use of Dewesoft NET - networked data acquisition solution. From New York subway to crash testing of high speed trains in Europe we provide solutions in this area. Here are only some basic applications.


Inspection and performance testing

To determine the highest speed of the trains the measurement of acceleration of the trains and under carriage must be performed to calculate the derailment index. Not only that we are able to calculate all the values with extensive math library which DEWESoft offers, but we can also acquire GPS data to determine where the section with potential problems is and video data to SEE the train as it drives along the track.


Passenger comfort

Passenger comfort is one of the numerous tests performed on the public transportation. With the measurement of vibration, the ride comfort index is calculated to determine how good the vehicle and the track perform. The systems are used not only for a single decision pass/fail criteria, but also for determining the cause of the higher values and providing the ways to analyze the possible solutions.


Ride testing

Dewesoft is not only fun to work with, but it plays a major role in fun applications. The software with the support of gyro platforms from XSens and Genesys in combination with video data offers great base for analyzing amusement park ride tests. The new rides must be checked for safety as well as the passenger comfort that people don't get sick while riding it.


Component testing

Since transportation is very similar to automotive, virtually the same rules apply to testing components in transportation application area.


Structural testing

When designing the vehicle, all mechanical parts are done with the use of computer and qualified with finite element method to determine natural frequencies of the structures. However, the need to check those method is needed more than ever to produce a closed loop to correct the models that they fit the measurement results. Dewesoft software FRF module adds the ability to import the geometry models, measure transfer functions with the use of either hammer or shaker excitation and see fascinating animation of the structures on the fly. Data can be easily exported to UFF format for further processing.

Order tracking

When determining how the structures behave under real operating conditions, order tracking provides the means of seeing the structural response to real life excitation. The rotating parts of the vehicle like engine, shafts or the wheels creates excitation forces on the structure. Did you ever had a car starting to rattle and shake at certain vehicle speed? This car was for sure not tested with DEWESoft and those high vibrations were result resonance frequencies of some elements at certain input frequencies.

By measuring rotating speed and the response (in terms of vibration, noise and others) the Nyquist, Bode and three dimensional FFTs are generated on the fly giving clear picture of the frequencies having a problem.

Torsional vibration

If the acceleration sensors provides information about linear movement, torsional vibration procedure provides the information about angular vibration. Imagine a long shaft going through the vehicle. Like each structure has linear natural frequencies, this shaft will have angular natural frequencies resulting at high angular vibration at certain rotation speed. To check the bending of the shaft, we mount any kind of angular sensor on each end of the shaft and measure the angle difference. The data can be used in order tracking to give a clear indication of natural frequencies.

Acoustics

Frequency analysis is a big issue in acoustics. Octave and fractional octave bands are used for this in most cases. DS MOD DSA provides an extensive choice of tools for frequency analysis, where all weighting functions for time and frequency weighting are implemented. For complex acoustic analysis, advanced measurement tools are available in addition to the standard analysis tools.

Main features:

  • Real time narrow band FFT
  • 1/1, 1/3, 1/12, 1/24 band octave spectrum
  • A, B, C and D-weighting (frequency weighting)
  • Fast, slow, impulse-weighting (time weighting)
  • Leq-calculation
  • Sound level meter

Post-processing features

  • FFT, octave analysis and weighting
  • Sound level meter
  • Sound power measurement

Electrical systems testing

One of the important parts of testing on electrical vehicles is power analysis. With the support of 50, 60, 400, 800 Hz and also 16 2/3 Hz and variable frequency as input to the power module, DEWESoft offers a great base for testing electrical systems.

Distributed data acquisition on long vehicles is crucial in system design. Since DEWESoft offers a great chance to synchronize more systems together, customers can buy more small data acquisition devices and use them independently, but when higher number of channels is needed, they can be connected together with LAN and sync connection to act like a single instrument.


Crash testing

Public transportation vehicles must be also checked for crashes. The trains for example are driven to the solid barrier. Dewesoft hardware and software with the support of high speed data acquisition cards as well as high speed cameras is perfect software to perform such tests.

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