INDOOR CYCLIC PLATE LOAD TESTING EQUIPMENT FOR BASE/ SUBBASE

Indoor Cyclic Plate Load Testing Equipment for Base/Subbase

EKE 0500:

ENKAY is well equipped to perform most standard mechanical and materials testing, as well as specialized   testing designed to customers requirements. ENKAY is leading supplier in India of high performance test systems in order to  help customers handle research and development process in their designs and manufacturing    process and to determine the mechanical behavior of materials, products and structures.

EKE 0500 has been designed basically to perform dynamic , static and quasi-static loading test on soil and asphalt surface where it is mainly simulating deformation of soil due to the effects of heavy loaded truck wheel. The test system consists of digital control system, software, robust heavy duty box type frame, high speed data logger system , servo – hydraulic actuator and hydraulic power pack. The system can be supplied with dynamic testing capability, also can be modified with appropriates sized servo valve , modified and hydraulic power unit to suit the particular application.

System has box type floor standing frame where top and sub oil layers are filled, where asphalt, concrete or composite road surface is  applied as sample. Frame has detachable blocks one side for easy loading and unloading of soil layers. Frame has needed accessories to place pressure cells and LVDT type displacement transducers for measuring the deformations. An electric motor is placed upon the frame to place actuator  X – Y axis according to researchers need.

The machine is equipped with  double ended , equal area linear actuators. Actuators is mounted on upper part of the system with 25 mm usable stroke length and mounted with manifold attached on it. Servo – valve and accumulators are closed coupled in order to improve performance with highest possible response and minimum pressure losses where  most accurate test control is achieved. SSI type displacement sensor with 5 µm resolution is integrated in the actuators. All dynamic testing systems are equipped with precision fatigue rated load cells where they are mounted on piston rod end for accurate force measurement and control.

ENKAY uses fully digital servo- hydraulic motion controller for displacement and /or force closed loop control of static and dynamic tests. Control loop time is 1 kHz as standard, but can be adjusted to 4 kHz according to application. Data acquisition  rate of the controller is standard 100 Hz but can be adjusted to 4 kHz if the applications control algorithm can run in this loop time. Effective resolution of analogue channels 19 bit over full ± 10 V range (18 bit for 0-10 V and ± 5V, 17 bit for 0-5 V, 16 bit for 4-20 mA).

The hydraulic power units are specially designed for dynamic performance of test systems, which are governed by  oil flow and pressure. The series have standard 500 kN dynamic force capability at 280 bar (3000 psi on servo-valve – system pressure can be adjusted to any value with rotary accessory) system pressure with standard rating up to 40 1/min oil flow. For large oil flows , the unit can be modified to suit customers. Electrical parts as indictors, system management buttons and controller is involved in the power  pack. Bladder type accumulators are supplied with the power pack in order to compensate pressure drop while actuator is operating and any other pressure losses between the HPU and test station, in order to smooth pump ripples . Oil Level, Oil Temperature, Filters condition and motor temperature are continuously checked by controller an system has necessary interlocks for fault conditions. Factory set pressure relief valve prevents excessive increases in pressure. Variable capacity pump ensure maximum electrical efficiency , consuming only sufficient electrical per to maintain the required flow, even during times of reduced flow demand. Compact designed hydraulic power units allow systems to be configured to control up to four systems independently , this means saving valuable floor space in your lab. Installed isolation manifold lets hydraulic power system running multiple test stations, preventing over pressurization , discharging system pressure separately and power isolation of the stations. According to the environment where system is going to be built, air/oil cooler is supplied as standard. However, alternative closed loop cooler systems can be adapted to unit if customer requests.

PC Software:
Cyclic loading test box is controlled by a computer with the free of charge software. The software is flexible and user- friendly  windows based application software for both static and dynamic testing. In the software user can create either test methods (Dynamic, Fatigue or static) or custom test sequences where you  can manage to run simple ramp to cyclic waveforms (sine, haversine, trapezoidal , square, triangle etc.), even arbitrary custom motion profiles. Synchronized 100 Hz data transfer from feedback signal supplies detailed recording of running tests. This rate is flexible up to 4 kHz if the application is applicable. Graphical and numeric monitoring is displayed real time in  the user interface. Data reduction and peak values recording are running in cyclic tests. Safety limits (Pressure and displacement limits) and internal algorithm protect the machine against any fault condition occurred in the system. The Software always optimizes the control parameters (PID and feed forward terms) during test in order to adapt actuator control to the changing stiffness characteristics of the specimen. The software also includes an easy calibration check facility. The machine gives some constant load values and waits there for easy check mechanism . Furthermore Data Acquisition   System are also delivered to customer freely, where data analyzing and reporting operations will be handheld with software while data loggers gathered data will be observed with Data Acquisition System.

Technical Specifications:
•    Control: 
        Standard : Force and displacement closed loop controlled.
        Option: Analogue (Stain, Stress) channel closed loop controlled

•    Actuator:  
        Standard : 0.01 to 5 Hz . Frequency 500 kN static 400 kN dynamic force capacity, 250 mm stroke (± 125 mm)
        Option: Different frequencies , force capacities, shorter or longer stroke 

•    Hydraulic Power Pack:
        Standard :  Free standing with air cooling unit, one output channel
        Option:  Water/oil cooler, four test station cap 

•    Power Requirements: 
        400 V/AC/ 50 Hz/ 3 Ph + N + E