Research Activities
Mission of the NVLab at DMMM, PoliBA is the theoretical and experimental analysis of Noise and mechanical Vibrations having the aim of their control.
Main sectors of application are macro- and micro-devices, machines, plants and facilities, manufacturing processes, transportations, environment.
Main activities are in the fields of theoretical (Multibody/FEM/BEM) and experimental analysis (classical and innovative modal testing, acoustics mapping, environmental testing, and NVH analysis for road/rail vehicles) of the dynamical behaviour of mechanical systems and devices.
Experimental activities can be carried out either in lab or in loco. Specifically, tests that the lab is able to perform are:
A) structural identification by Experimental Modal Analysis (Input-Output Modal Analysis of linear and nonlinear systems), Operational Modal Analysis (Output-only Modal Analysis), Vibro-Acoustic Modal Analysis tests, Transmissibility-based Operational Modal Analysis, Operational Modal Analysis of vehicle systems;
B) vibration measurements by accelerometers, Laser Doppler Vibrometer, and u (μ-flown) probes;
C) acoustics measurements, i.e. sound power measurements by p-p and p-u (μ-flown) sound intensity probes, acoustic impedance measurements by p-u (μ-flown) probes, acoustic fields' mapping and source localization by acoustic holography, Transfer Path Analysis (TPA, OPA);
D) vibration (environmental) testing of mechanical, mechatronic systems and devices on electro-dynamic shakers of large size (up to 20 kN), under close loop controlled base excitation (linear, log swept sine deterministic, white, pink stochastic).
Companies and Institutions
New York University
USA, University of Liege
Belgium, Aalborg University
Denmark, Kiel University
Germany, RWTH AAchen University
Università Politecnica delle Marche - Italy
SISW – Belgium
MERMEC – Italy
MASMEC – Italy
ISOTTA FRASCHINI MOTORI - Italy
Facilities
Server comprising 2 cluster nodes, each equipped with 2 XEON processors E5-2680 v3, for a total of 96 cores, 448 GB RAM, and 16 TB of disk space.
Mobile PC based multichannel analyzer platform for noise and vibration analysis equipped with the needed software applications, having real-time capability, able to perform signal processing (FFT, 1/n-octave (CPB) and overall analyses simultaneously on th
Electrodynamic shakers (2 N, 200 N, 450 N, 2000 N, 20000 N) equipped with the needed power amplifiers. Impact hammer.
Piezoelectric and piezoresistive accelerometers of different classes with the needed calibrators and cables. Impedance heads.
Laser Doppler Vibrometer and all the needed measure chain components. Sound Intensity probe kit equipped with the needed calibrator.
Sound level meters.
Microphones of different classes equipped with the needed calibrators and cables.
Micro-flown transducers.
Services
theoretical analysis with proprietary and commercial codes (Multibody / FEM / BEM) of the dynamic behavior of structural components, systems, mechanical and mechatronic sub-systems and devices, experimental modal analysis, in operative and laboratory conditions, and the vibratory modal analysis acoustic mapping of sound fields
measurement and characterization of the levels of vibrational quantities (displacements, velocities, accelerations, dynamic actions) and acoustics (pressure, intensity, sound power and acoustic impedance). identification of vibratory and acoustic sources with holography techniques and TPA (Transfer Path Analysis) NVH analysis (Noise Vibration Harshness), noise, vibration and comfort for land vehicles.
