Noise, vibration, and harshness

Contact:

Laboratory

Projects:

Main Results:

Dissertation topics:

Publications:

Industrial cooperation:

Transmission development

Experimental Approach

Computational approach

Determination of modal properties

Harmonic analysis

Modelling of real excitation character

Operating conditions with real load character

Vibrodiagnostics

Noise sources locating

Modelling of the behaviour of operating fluids

Digital twin of the Tractor

Long-term procedures combining modern measuring technology, mathematical models and unique procedures into one whole is one of the possible ways to determine the NVH of machines. However, in order to link these approaches, it is necessary to have not only sufficient equipment that must be linked in a targeted manner, but also a strong knowledge base to use them or to address the area with numerical simulations. With this linking, it is possible to perform design optimization and achieve sound quality assurance in the interior and exterior of the machine. Thanks to the acquired and continuously developed experience in development and testing, we are the key laboratory in the Czech Republic capable of comprehensively addressing the NVH of drive trains. To ensure versatility, our facilities and equipment are purposefully modifiable and adaptable.

Vibroacoustic speech is an integral part of every machine falling into a wide variety of industries, with manufacturing, automotive, aerospace and consumer industries being the dominant ones, this is a very current fast growing field. A comprehensive assessment of vibroacoustic parameters, including the perception of acoustic response, is the subject of NVH, which is derived from Noise, Vibration and Harshness.

The complex system for the determination of NVH parameters enables the derivation of very demanding operating conditions (realistic nature of loading) of key aggregates of vehicles in laboratory conditions of free acoustic field, thus enabling the application of advanced tools for quantitative and qualitative determination of NVH parameters.

In fundamental research:

algorithms and programs for efficient computational modelling of nonlinear multi-physics problems,
Research on artificial intelligence methods for system behaviour estimation and predictive maintenance,
methods of fusion of measured responses with simulation outputs for modelling mechatronic systems in the form of virtual twins,
The VVI allows the following experimental areas: determination of the distribution of acoustic pressure regions in close proximity to critical locations in terms of sound radiation by structures, waveforms in the vicinity of the buildings of the measured objects, direction and mode of propagation in the free sound field environment, determination of the energy balance of forced vibration of structures and transfer to the acoustic cavity.

On the application level, it is mainly about:

Research and development in the field of advanced mechatronic components, applications and embedded systems. It is mainly applied research on integrated mechanical components, actuators and drives, including control, electronics, sensors.
Determination of modal properties of functional unit components, definition and derivation of excitation force effects, determination of mechanical vibration response at key locations of the functional unit (bearings, actuator mounting, critical areas in terms of sound radiation to the environment), determination of the response of acoustic quantities and their quantification according to the relevant standards (sound pressure level, sound power level), localization of critical areas in terms of sound radiation from the structure into the acoustic environment, description of the distribution of acoustic levels in the vicinity of the functional unit under real operating conditions.
Comprehensive measurements and verification of the properties of materials and mechatronic systems of machinery, for example in the context of manufacturing processes, material handling or technical diagnostics of the state of the equipment.