Dynamic Triaxial System DYNATRIAX EmS

Main Features

• Electromechanical Servoactuation, no need of compressed air or hydraulic power supply for the vertical force
• Capability to perform Static (effective stress and stress path), Dynamic soil triaxial tests
• Maximum dynamic load: 15 kN
• Maximum static load: 10 kN
• Triple-axes closed loop control of axial load/displacement, cell and back pressure
• Automatic compensation of cell/back pressure during dynamic stage
• Operating frequency more than 10 Hz (depending on test conditions)
• Complete automation of all test stages using an high sensitivity closed loop PID feedback
• Options available for bender elements testing and for local strain transducers
• Standard and user defuned wave shapes which can mimic the real in situ measurements (earthquakes)
• Test set-up by unique programmable multi-stage procedure. When a test is running, it is possible to access all parameters to expand and modify the stages as per the response of the specimen
• Manual and automatic emergency shut off function
• Multitasking, user-friendly Windows-based software pre-installed on the PC
• Extra-accurate transducers calibration adopting linear or polynomial regression or multi-coefficient linearization

Description

DYNATRIAX EmS benefits from CONTROLS Group new EmS “Electromechanical Servoactuation” technology.

EmS technology is environmentally friendly and clean to operate, requiring no compressed air or hydraulic oil. It offer excellent reliability, accurate testing and lower maintenance requirements. The intuitive design ensures it can be quickly and easily maintained, only requiring regular lubrication.

The system controls three closed-loop axes:

• Axial load/displacement
• Cell pressure up to 1000 kPa
• Back pressure up to 1000 kPa

The base system includes:

• Reaction frame
  • Robust 2-columns construction, stiff and compact

• Electromechanical vertical load application
  • high performance motorized actuator, 15 kN capacity, backlash free and noiseless
  • sophisticated PID closed-loop control, ensuring load is reached fast, smoothly and accurately and then maintained with high level of accuracy. The submersible load cell delivers high accuracy from the lowest values
• Data acquisition, process and control

The CDC manages up to 3 closed loop axes (axial load/displacement, cell and back pressure) with an effective loop rate of 10 kHz and performs the test completely automatically including the on/off valves for the drainage line and for the air supply to the triaxial cell. It is linked to the PC via LAN/Ethernet link (1 Gbit/s) and comes with 16 transducer ports (real resolution 16 bit).

• PID control

An extremely efficient algorithm with larger gain ranges gives enhanced sensitivity, making it easier to tune the system and achieving a more accurate wave shapes.
Recently added features include manual and automatic amplitude control which compensate for small changes that may occupr in the system during cycling, ensuring that the required peaks are consistently reached. The improved tuning panel, with its more user-friendly interface, provdes all the tools necessary to optimize the system control during static and cyclic test stages

Specifications

• Maximum dynamic load: 15 kN
• Maximum static load: 10 kN
• Maximum vertical travel: 50 mm (different travels available on request)
• Maximum testing frequency: more than 10 Hz (depending on testing conditions)
• Volume change measurement: 100 cc volume change device with automatic flow inversion
• Max sample diameter: 100 mm
• Maximum confining pressure: 1000 kPa
• Maximum back pressure: 1000 kPa
• Close loop control frequency: 10 kHz
• Input channels: 16 – Real resolution 16 bits
• Voltage:  208-230 V, 50-60 Hz, 1 ph  or  110 V, 60 Hz, 1 ph

Ordering Information

Accessories

Submersible load cell

Axial LVDT

Volume Change

Pressure transducers

Upgrade for Resilient modulus test