Instrumentation

The research group is equipped with up-to-date NVH measurement and analysis instrumentation including:

data acquisition systems: 4 multi-channel data acquisition systems up to 50 channels (Siemens LMS Scadas 310, 305, Mobile M2, NI Crio);

sensors: more than 50 accelerometers (mono-axial, tri-axial, lightweight) (PCB and B&K), microphones (PCB), 1 impedence head (PCB), force sensor (Kistler), PU probe (Microflown), strain sensors (PCB), laser doppler vibrometer (Polytec), 6 tachometers probes, 1 hydrophone (B&K), 1 triangulation laser (MICRO-EPSILON).

exciters: 3 modal impact hammer of different size (PCB), 2 electromagnetic shakers (The Modal Shop), Tri-axial electromagnetic skaker DongLing 3ES-10-HF)

signal conditioning equipment: analogue and digital filters, digital signal processors.

Softwares: workstations and PC’s with licenses for all major CAE software for NVH analysis (Siemens LMS Virtual. Lab, Nx Nastran).

UniVibe software: a user-friendly software for automated condition monitoring and diagnostics of geared transmission. The software is developed with Unicom Group (http://www.unicomgroup.org/).

Test benches:

1. Rotor balancing machine (CEMB). Belt drive machine for small rotors. The special design of the driving system enables the machine to be operated both with the belt placed on top of the rotor and with the belt fixed in position under the rotor. The machine base plate can be simply rested on a working bench or bolted down to a solid base element.

2. Triaxial shaker 10kN (DongLing 3ES-10-HF and Siemens controller). –Sine Force: 10kN; Random Force: 10kN; Max payload: 100kg; Table size: 500X500 mm; frequency range: DC to 2kHz; Vel MAX: 1.2m/s; Acc MAX: 6g/8g. –Minimize the test time: three axes can reduce the testing time, shorter time than single axes.
–Reproduction reality environment: three axes shaker simulates reality dynamic environment more realistically than single shaker can do.
–Orthogonal Coupling Bearing Unit that uses high oil pressure and loading of hydrostatic bearing leading to not metal contact. Optimized throttle hole distribution to ensure the transmitting force.
–Siemens Controller: MIMO Random, MIMO Stepped Sine, MIMO swept Sine, MIMO Time Waveform Replicator for reproducing your own acceleration profile.
https://www.youtube.com/watch?v=2utkA9_7ZZo&t=30s

3. test bench for gearboxes diagnosis. The test bench, developed in collaboration with Bonfiglioli Riduttori enables the experimental analysis of the vibro-acoustical behaviour of rotating machineries and the investigation of the vibration effects of different types of faults. The test bench consists of a base, including an induction driving motor controlled by inverter and a gear unit, while another motor applies the load torque; speed and torque are controlled by inverters. (link articolo Banco prova

4. test bench for bearing diagnosis. The test bench enables the vibration monitoring and diagnostics of bearing