Vibroacoustic device measurements

Vibroacoustic device measurements

Main aims of vibration measurements

  • evaluation of the effect of vibration on durability
  • solving fatigue problems
  • evaluation of material noise
  • establishing critical work points (frequency, speed, etc.) at which the vibrations of highest amplitude occur
  • establishing the main reasons behind excessive noise emissions
  • evaluation of wear of machinery components – diagnostics
  • limiting vibration with the aim of ensuring safety and comfort

Main purposes of noise measurements

  • diagnosis of incorrect operation
  • establishing of excessive noise production
  • ensuring compatibility with requirements and norms
  • ensuring quality
  • product development (regarding noise)

Vibroacoustic measurements

  • measurements of vibration in gearmotors, window lifters, wiper mechanisms, sunroof mechanisms, etc.
  • steering wheel vibration measurements at engine idle
  • vehicle door vibration measurements during closing (damping)
  • engine and exhaust system vibration measurements
  • low frequency vibration measurements using a seismic sensor – for example, in order to evaluate floor vibrations under precise measuring machines
  • vibration measurements with non-contact sensors
  • vibration measurements with triaxial sensors at temperatures up to 260℃
  • analyses: FFT, order, overall, CPB, Time Domain
  • acquisition of 32 channels at a frequency of up to 40 kHz
  • acoustic pressure level measurements
  • spectral analysis of vibration and noise
  • establishing the acoustic power of machines and devices in situ
  • noise acquisition for subjective evaluations

Norms

  • PN-EN ISO 9614-1:2010
  • PN-EN ISO 9614-2:2000
  • PN-EN ISO 9614-3:2010
  • PN-EN ISO 3746:2011

Analyses

  • frequency analysis (FFT, CPB, FRF and others)
  • time analysis (Time Domain)
  • order analysis (Order)
  • torsional vibrations measurements
  • ODS (Operational Deflection Shapes)
  • Overall
  • diagrams in time function, rotation speed, frequency, order, etc

Converters

  • vibration sensor 1 axial (to 480℃)
  • vibration sensors 3 axial (loading up to 260℃ and ICP)
  • CAPACITEC non-contact displacement sensors
  • IVS-500 Industrial Vibration Sensor (POLYTEC)
  • torsional vibration measuring laser (Bruel&Kjaer)
  • power converter (PCB) and modal hammer (Bruel&Kjaer)
  • polarised (200 V) class 1 microphones (Bruel&Kjaer and G.R.A.S.)
  • sound intensity probe (G.R.A.S.)

Equipment

  • We have a multi-channel DAQ equipment from companies such as Brüel&Kjaer, OROS, DEWESOFT
Document No. Title/Description
PN-EN ISO 9614-1:2010 Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 1: Measurement at discrete points
PN-EN ISO 9614-2:2000 Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 2: Measurement by scanning
PN-EN ISO 9614-3:2010 Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 3: Precision method for measurements by scanning
PN-EN ISO 3746:2011 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane