MTS TestLine - Manual (Page 26)

Description Name Item
HSM contains the ports to provide hydraulic
filtration, the use of accumulators, and hydraulic
solenoid valves to control the hydraulic pressure to
the work station. The basic function of the HSM is
to provide line pressure regulation including on/off
control.
The actuator is used to impart force on a specimen.
An actuator consists of a cylinder that contains a Actuator with Linear Variable
Differential Transformer (LVDT) 3
piston. When high pressure fluid is applied to one
side of the piston, the piston moves. If the piston
rod contacts some external reaction point, then a
force is applied to that point equal to the effective
piston area times the actuating pressure. The main
criteria for selecting an actuator are the force and
stroke (displacement) required for the job. Linear
actuators are typically associated with axial control
channels, which usually include an LVDT (to
measure displacement) and a load cell (to measure
force).
The heart of the servohydraulic system is the
servovalve. It is the final control element in most Servovalve 4
MTS closed-loop systems. The servovalve responds
to command signals generated by the software and
routed through the digital controller and out of the
valve driver module, which opens the pressure and
return ports to the actuator. The servovalve
regulates the direction and flow of the hydraulic fluid
entering the actuator. The direction that the spools
move determines the direction of fluid flow to the
actuator. Unequal pressure is what causes the fluid
to move.
The load cell or force sensor (also called a force
transducer) is used to measure forces being applied
to the specimen. Load Cell (force sensor) 5
The computer provides the interface between you
and the controller. It also is the platform on which
MTS FlexTest and MTS TestSuite software run. Computer with MTS FlexTest
(Series 793) Controller
Software - Station Manager 6
application and MTS TestSuite
MTS FlexTest software enables you to control the
load frame via the controller from the user interface
software - MTS Multipurpose
(MP) Express application
PC. This manual focuses on the use of the MTS
FlexTest Station Manager application that is used
for station setup.
MTS TestSuite Multipurpose Express (MPX)
software enables you to run material tests and
generate reports.
26 | MTS TestLine Test System Operation
System Introduction