Mecanum


Description
  • 0
  • February 27, 2018
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Mecanum – Impedance and Transmission Tubes

Mecanum is a canadian acoustics engineering company, and a world leader in acoustic materials. Mecanum aims to resolve complex noise and vibration issues and supplying clients with high-end acoustic laboratory equipment. Mecanum offers personalized consulting services in different fields like Noise and vibration control, transport and building acoustics, industrial, poroeleastic damping materials.

Impedance and Transmission Tubes

Tube-4mic

Mecanum’s impedance and transmission tubes are specifically designed to measure the main acoustic indicators of a wide range of acoustical materials. The method is based on ASTM E1050ISO 10534-2 and ASTM E2611 standards.

MATERIAL PROPERTIES

➡ Normal incidence sound absorption coefficient (α)

➡ Normal incidence complex reflection coefficient (R)

➡ Normal surface impedance (Zs)

➡ Normal incidence sound transmission loss (TL)

➡ Characteristic impedance (Z)

➡ Wave number (k)

➡ Transfer matrix coefficients (Tij)

➡ Equivalent/effective dynamic density (ρeq)

➡ Equivalent/effective dynamic bulk modulus or compressibility (Keq)

TUBE MODELS

Impedance Tube (2 microphones)
Available options: 29 mm diameter (200-6600 Hz), 44.44 mm diameter (100-4300 Hz), 100 mm diameter (35-1900 Hz)

Impedance and Transmission Tube (3 microphones)
Available options: 29 mm diameter (200-6600 Hz), 44.44 mm diameter (100-4300 Hz), 100 mm diameter (35-1900 Hz)

Impedance and Transmission Tube (4 microphones)
Available options: 29 mm diameter (200-6600 Hz), 44.44 mm diameter (100-4300 Hz), 100 mm diameter (35-1900 Hz)

Portable High Sound Pressure Level Impedance Tube (2 microphones)
High SPL 19 mm diameter (500-10000 Hz, 155 dB), 29 mm diameter (500-6600 Hz, 155 dB)

APPLICATIONS

  • Benchmarking
  • Quality control
  • R&D applications

Impedance and transmission measurements can be used by FOAM-X for the inverse identification of open cell porous material properties such as : open porositystatic airflow resistivitytortuosityviscous and thermal characteristic lengths, and static thermal permeability.

FEATURES

Standard Mecanum’s impedance and transmission tube system includes:

  • Impedance and transmission tube;
  • Microphones;
  • DAQ system;
  • Ultralow distortion audio amplifier;
  • TUBE-X software;
  • A verification sample to check the measurement procedure;
  • Grids to support limp materials;
  • Rings to minimize acoustical leaks around the sample.

TUBE-X software fully controls the measurement procedure from the calibration to the measurement itself.  It corrects the atmospheric conditions and the tube’s internal dissipation.  It may also eliminate effects of grids and rings if they are used during measurement. Small (29-mm diameter), medium (44.44-mm diameter), large (100-mm diameter), and custom (circular or rectangular) tubes are also available to cover respectively the 200-6600 Hz, 100-4300 Hz, 35-1900 Hz, and custom frequency ranges.