Resonant column

Resonant column 31-WF8500
Resonant column schematic layout
Detail of electric motor, coils and magnets
Principle of the Steady state and free decay method

Main Features

  • Combined Resonant Column / Torsional Simple Shear device
  • Automatic detection of fundamental frequency
  • RC: damping ratio from half power bandwidth and from free vibration data
  • TSS: damping ratio from hysteresis loops
  • Internal floating frame for large angular and axial deformation
  • Confining pressure up to 1 MPa
  • Suitable for 50 mm dia. specimen (or 38 mm on request)
  • Integrated signal generator and oscilloscope 
  • PC with dedicated software included 
  • tecnical specifications
    • Scroll the table
      • Maximum torque: 1.2 Nm
      • Maximum angular deformation: 10°
      • Maximum cell and back pressure: 1 MPa.
      • 8 channels signal conditioning unit
      • USB data acquisition and signal generation board
      • Two electro-pneumatic converters for cell and back pressure
      • Excitation frequency: Dynamic (RC) 1-300 Hz; Cyclic (TS) from 0 to 50 Hz maximum
      • Dimension: Control Box 51x45 x 35 cm (h x w x d); Cell 55 cm x 27 cm (h x diam.)
      • Weight: approx 50 kg

  • ordering info
    • 31-WF8500 
      Combined resonant column/torsional shear device for the automatic determination of damping ratio from half power bandwith and free vibration decay method.                                            

  • accessories
    • Accessories

      Membrane stretcher for 50 mm diameter samples.
      O-ring placing tool for 50 mm diameter samples.
      Rubber membranes for 50 mm diameter samples (pack of 10).
      O-ring for 50 mm diameter samples.
      Lateral filter drains (pack of 50).
      Two-part split former for 50 mm diameter samples with vacuum attachment.
      Hand sampler complete of cutter, wooden dolly and receiver for 50 mm samples.

      Air compresor 

      Air compressor, 10 bar/145 psi maximum working pressure, output 10.2 cfm, 100 l receiver. 230 V, 50 Hz, 1 ph

      Air filter/water trap for air compressor

      De airnig water system 

      De airing tank, 23 l cap.

      Portable vacuum pump. 220-240 V, 50-60 Hz, 1 ph

      Rubber tubes for vacuum (two pieces required)

      Air drying unit

      Silica gel dessicant with indicator

      Valve panel for use with de-airing tank

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