- Control of vehicle admissible noise level
Nowadays there exist certain standards describing the admissible level of vehicle’s sound emission depending on the type and class of a particular vehicle. In most cases, the test for conformance of the vehicle to the applicable requirements is conducted in several stages (kerb weight, full and partial load) and at various speed levels. As for the configuration of the test system, it encompasses the following instrumentation:
FFT Spectrum analyzer (the required number of channels depends on the amount of the measurement transducers used)
Microphones (as a rule, two microphones are located in transverse position to the vehicle as it passes the control area)
Accelerometers (the accelerometers are used for the vibration level monitoring at the controlled area in the case if this control parameter is provided for by the applicable requirements)
PC with the software used for the accumulated data analysis (the PC with task-specific software installed is used for visual representation and analysis of the signals received from the FFT Spectrum analyzers).
- NVH level control in the passenger compartment. In order to conduct noise- and vibration level control in the passenger compartment, the following instruments can be used:
FFT Spectrum analyzer (the required number of channels depends on the number of the measurement transducers used; the FFT Spectrum analyzer is connected to the PC for data transmission and further processing)
Microphone (the microphone is placed in the central part of the passenger compartment; it is also possible to use two microphones located in the are of driver’s and passenger’s seats)
Accelerometer – in the case of simple configuration of the system the accelerometer is mounted on the slide of the driver’s seat or between the front seats. In the case of a more complex configuration of the system, the accelerometers are mounted near the pedal box, steering rack, gear box or instrument panel.
PC with the software used for data analysis (PC with pre-installed ZETLAB Software used for visual representation and analysis of the signals received from the FFT Spectrum analyzers).