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siPass-by
Pass-by measurement system according to ISO 362 and ECE-51
Flexible and easy handling
- Fast measurement/analysis
- Freely adaptable configurations
- Digital telemetry up to audio bandwidth
- Convenient data management in a network
Numerous analysis options, e.g.:
- High-resolution order analysis
- Tire rolling noise measurement
- Noise source separation
Application areas
- Research and development
- Conformity testing
- Portable and stationary
Support for new measuring method ECE-51
The main differences between ECE-51 and the old ISO-362 are the acceleration method and the calculation of the end result.
Acceleration in ISO-362 is defined as approach with 50 km/h and then full throttle after passing the -10m line. In contrast ECE-51 requires 50 km/h at microphone position. This usually requires pre-tests where the drivers accellerates at various positions and determines the speed at microphone position. This has to be repeated for each vehicle with different power.
siPass-by supports the driver in displaying the point where 50 km/h was reached. So the driver knows how much acceleration has to be displaced in order to reach 50 km/h at microphone position.
ECE-51 also calculates the end result by taking the actual acceleration and the so-called power-to-mass-ration of the vehicle into account. Both determine which gears have to be tested. siPass-by also supports the driver by calculating the required gears and listing the detailed decision parameters.
