Resonant column

Resonant column and torsional shear apparatus 31-WF8600

Main Features

Wykeham Farrance’s Resonant Column is a versatile system that combines Resonant Column and torsional shear tests into one convenient device for evaluating Shear Modulus and Damping Ratio. It includes:
  • current-driven motor that applies torsional load to the sample
  • a series of transducers with signal conditioning
  • cell and back pressure electro-pneumatic control system
  • data logger.
Versatile: Resonant column and cyclic torsional shear devices are combined into a single device allowing you to determine the following:
  • RC: damping ratio from half power bandwidth, free vibration data and white noise
  • TSS: damping ratio from hysteresis loops
Compact and easy-to-install: the cell consists of an outer cell and inner cell, both supporting the magnetic drive simultaneously. Connecting the laptop supplied to the compact unit, the user can to access all controls, power supply as well as electrical and pneumatic devices.
Robust design and long lasting: Sturdy construction minimizes losses and helps to deliver a consistent frequency response. The stainless steel base cell with acrylic transparent cylinder won’t rust or corrode, prolonging your equipment’s life.

User-friendly Graphic User Interface (GUI). The high quality laptop PC supplied with pre-installed intuitive Windows-based software allows you to perform various stages: saturation, isotropic consolidation, resonant frequency and torsional shear. The 7” color touchscreen with high resolution display makes cell, back and pore pressure easy to monitor.

Efficient and time-saving: The software uses the “Chirp Method” to continuously change the frequency applied to the sample. This method experiences no jumps when changing from one frequency to another improving strain measurement resolution and shortening testing time.

Easy saturation: additional upper drainage is included ensuring proper sample saturation.

High resolution and accuracy: Proximity transducers are mounted on the automated positioning system which automatically places them in the best measuring position after saturation and consolidation, eliminating the need for any manual adjustments during the test.

  • tecnical specifications
    • Scroll the table
      • Maximum torque: 1.5 Nm
      • Maximum angular deformation: 10°
      • Maximum cell and back pressure: 1 MPa.
      • 10 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-WF8600
      Resonant Column — Combined resonant column and torsional shear device for the automatic determination of damping ratio from half power bandwidth and free vibration decay method.
      110-220V, 60-50 Hz, 1 ph
      - Maximum torque: 1.5 Nm                         
      - Maximum angular deformation: 10°               
      - Maximum confining pressure: 1000 kPa
      - Maximum sample size: 50 mm diameter x 110 mm height
      The system includes:                       
      - Stainless lower base cell with stainless steel columns and acrylic transparent cylinder (170mm internal diameter and 15mm thickness).                            
      - Upper and lower drainage lines ensuring proper sample saturation 
      - Motor allowing large axial and angular deformation
      - Motor support integral to the inner cylinder for easy assembly            
      - Integration of oscilloscope and function generator in the system data acquisition and control system ensuring consistency             
      - Two electro-pneumatic converters for cell and back pressure 1000 kPa.                        
      - 10 channels signal conditioning and data recording                                          
      - Volume changes device with LVDT for measuring variation of volume                                     
      - LVDT for axial strain measurement        
      - Three pressure transducers for cell, pore and back pressure                                      
      - Two Eddy current displacement sensors with high precision motorized proximity sensors positioning
      - Low MEMS accelerator
      - Laptop PC complete with accessories and monitor      
      - Software to manage the test, time data acquisition and recording                            
      The system generates a mechanical stress by the electromagnetic motor consisting of 8 coils and 4 magnets NeFeB with frequency range from 0 to 300HZ (for resonant column test) and from 0 to 50Hz (for torsional shear test).                           

  • accessories
    • Accessories
      28-WF4051/A Membrane stretcher for 50 mm diameter samples
      28-WF4051/B O-ring placing tool for 50 mm diameter samples
      28-WF4055 Rubber membranes for 50 mm diameter samples (pack of 10)
      28-WF4056 O-ring for 50 mm diameter samples
      28-WF4051/E Lateral filter drains (pack of 50)
      31-WF4051/H1 Two-part split former for 50 mm diameter samples with vacuum attachment
      28-WF4051/G Hand sampler complete of cutter, wooden dolly and receiver for 50 mm samples
      NOTE: 38 mm accessories are available on request
      Air compressor 
      28-D2015 Air compressor, 10 bar/145 psi maximum working pressure, output 10.2 cfm, 100 l receiver. 230 V, 50 Hz, 1 ph
      28-WF2016/2 Air filter/water trap for air compressor

      De airing water system

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