NVH monitoring method use in pass-by noise level control and traffic management systems
Various types of NVH control technology are widely used for vehicle operation parameters control. However, the NVH method can also be used in the context of environmental concerns and for noise-reduction application.
Nowadays there exists a great number of requirements applicable to various types of vehicles in terms of pass-by noise (PBN) level control. The pass-by noise reduction techniques imply the need of deployment of a comprehensive measurement and control system allowing to detect and register the pass-by noise of a particular vehicle with further analysis of the accumulated data (the analysis implies the separation of the noise map into individual noise contributors). The system used for PBN analysis and reduction generally consists of the components used for vibration and frequency level recording and the software used for the accumulated data analysis. The results obtained allow to analyze the vehicle’s acoustic characteristics, to find their sources (the so-called “noise contributors”), and to undertake measures aimed at reduction of the vibration and noise level in compliance with the applicable requirements.
It is noteworthy that this very configuration of the NVH method can also be used for the purposes of the acoustic signature analysis (e.g., for further implementation in traffic control and management systems). However, in this case, the system configuration will imply the need of a real-time data transmission system deployment as well as implementation of specific program algorithms. As for the general operating principle and system components, the PBN control system seems quite similar to the traffic management system.
Another interesting implementation of the PBN control system, which has been recently developed, is the NVH-simulation (also sometimes referred to as the NVH data reproduction). The NVH simulation can be useful for testing and comparison of the characteristics of the specimen prototypes, for health-related research, for control of the specimen parameters requirements with the customer or end-user requirements, etc. Actually, the application sphere of the NVH simulation steadily increases, since it is a quite cost-efficient solution in many use scenarios (the list of instruments necessary for NVH simulation or reproduction is rather limited, while reproduction of NVH parameters in real environment is not always possible).
Besides, reproduction of the NVH parameters in the laboratory environment often requires the use of an acoustic chamber, while the NVH simulation has less strict requirements to the instrumentation used.
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