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Resonant Column

Resonant Column
Resonant Column
Resonant Column
Resonant Column
Resonant Column
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.

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
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.

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

How it works:
  • A cylindrical soil specimen is restrained at the base and dynamically excited at the top by means of an electrical motor generating torsional forces via eight drive coils encircling four magnets attached to a drive plate at frequencies of up to 300 Hz
  • The fundamental mode of vibration is determined from the maximum amplitude of motion. Following test standard ASTM D4015, resonant frequency, shear wave velocity and shear wave modulus are calculated using elasticity theory.
  • The corresponding shear strain is evaluated from the motion amplitude. Material damping can be determined from the half-power bandwidth or from a free-vibration decay curve, which is generated by shutting off the driving power.
  • In the Torsional Shear test, the soil specimen is deformed cyclically at a low frequency (a maximum of 10 Hz), whilst continuously monitoring torque and deformation.
  • From the torque-deformation curves, a relationship between average shear stress and average shear strain is obtained, which in turn provides the shear modulus and the damping ratio.
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  • Home
  • Calibration
  • Equipment
    • Aggregates >
      • Sieves & Accessories
      • Sieve Shakers
      • Sample Splitters
      • Sand Equivalent Kit
      • Clay Index Kit
      • ALD & AGD Apparatus
      • Los Angeles Abrasion Machine
      • Specific Gravity Frame & Baskets
      • Density, Voids & Absorption
      • Cleanness Value Agitator & Washing Vessel
      • Weathering Index Roller & Tray
      • Crushing Value Apparatus (ACV)
    • Soil & Road Base >
      • Augers & Accessories
      • Sampling & Classification
      • Field Inspection Testers
      • Scala Penetrometers
      • Impact Soil Tester (Clegg)
      • Plate Bearing Test Apparatus
      • Particle Size Analysis
      • Atterberg Limits
      • Universal Proctor/CBR Automatic Compactor
      • Standard & Heavy Compaction (Proctor)
      • California Bearing Ratio (CBR) Apparatus
      • Vibrating Compaction Hammer
      • Moisture Content Determination
      • Sample Preparation
      • Chemical Tests Apparatus
      • Permeability Apparatus
      • Field CBR Test Set
      • Sand Replacement Test Sets
    • Concrete & Cement >
      • COMPACT-Line Concrete Compression Machines
      • SMART-Line Control Consoles
      • Control Consoles for Advanced Testing
      • Flexural Testing Frames
      • Concrete Pipe Testers
      • Concrete Mixers
      • Concrete Moulds
      • Concrete Specimen Curing
      • Specimen Grinding Machines
      • Cutting & Coring Machines
      • NEX® Monitoring System
      • TruMatch™ NEX® Curing
      • Workability & Consistency of Fresh Concrete
      • Air Entrainment Meters
      • Bleeding & Density of Fresh Concrete
      • SCC Testing Apparatus
      • Gyratory Compactor for Cement & Concrete
      • Water Permeability Apparatus
      • Concrete Compaction
      • Concrete Mortar Penetrometers
      • NDT Strength Evaluation Apparatus
      • NDT Quality & Homogeneity Evaluation
      • NDT Durability Test Apparatus
      • NDT Structural Inspection & Monitoring
      • Cement & Grout Moulds
      • Mortar Mixers
      • Cement Specimen Curing
      • Compression-Flexural Cement Testers
      • Soundness by Le Chatelier
      • Setting Time & Consistency
    • Asphalt & Bitumen >
      • Standard Asphalt & Bitumen Test Equipment >
        • Centrifuge Binder Extractors
        • Filterless Centrifuge Binder Extractors
        • Solvent Recovery Unit
        • Binder Recovery Apparatus
        • TMSG (Rice) Apparatus
        • Marshall Apparatus
        • Skid Resistance & Friction Tester
        • Road Surface Irregularity Measurement
        • Benkelman Beam Apparatus
        • Sand Circle Apparatus
        • Dynamic & Kinematic Viscometers
        • Bacon Sampler
        • Flash Point Testers
        • Distillation of Cut-Back Asphalt apparatus
        • Determination of Solubility Set
        • Particle Charge Tester
        • Emulsified Asphalt Distillation Apparatus
        • Setting Tendency of Bitumen Emulsions
      • IPC Global Performance-Based Test Equipment >
        • Automatic Binder Extractors
        • Laboratory Mixers
        • Shearbox Compactor
        • Slab Roller Compactors
        • Cutting & Coring Machines
        • Wheel Trackers
        • Gyratory Compactors
        • Mixture Perfomance Testers
        • Universal Testing Machines
        • Modular Asphalt Testers
        • Stand-alone Testers
        • Dynamic Test Accessories
        • Binder Penetrometer
        • Rotational Viscometer
        • PAV & VDO
        • RTFO Ovens
        • Ductilometers
        • Ring and Ball Apparatus
        • Bending Beam Rheometer
        • Dynamic Shear Rheometer
    • Soil & Rock Mechanics >
      • Consolidation Apparatus
      • Shear Testing Equipment
      • Static Triaxial Systems
      • Dynamic Triaxial Systems
      • Resonant Column
      • Triaxial Cells
      • Rock Sample Preparation
      • Behavior of Joints
      • Rock Classification
      • Uniaxial & Triaxial Systems
      • Rock Permeability & Durability
      • Uniaxial & Triaxial Accessories
    • General Lab >
      • Ovens & Hot Plates
      • Balances & Weights
      • Thermometers & Hydrometers
      • Measuring Instruments
      • Laboratory Glassware
      • Porcelain, Plastic & Misc
      • Laboratory Hardware
      • General Purpose Equipment
      • Drying Test Chambers
      • Laboratory Fume Extraction
    • Universal Testers >
      • UTM - HPT Series
      • Automatic Computerized UTM
      • Cold Bend Testing Machine
      • UNIFRAME Universal Testers
  • NDM
    • NDM Troxler Gauges
    • NDM Survey Meter
    • NDM Shipping
    • NDM Training
  • Hire
  • Documents
  • News
  • Contact Us
    • Meet the Team
    • Join our Team