MTS SWIFT 20 Ultra Sensor - Manual (Page 18)

SWIFT 20 Sensors 18
Construction
Hardware Overview
Construction
The SWIFT sensor has one-piece construction for outstanding fatigue life, low
hysteresis, and high stiffness. Its compact package has a minimal effect on inertia
calculations, and a minimal dynamic effect on the test vehicle.
The transducer can be used for developing conventional durability tests on the
MTS Model 329 Road Simulator. Normally, the transducer is replaced with an
equivalent wheel adapter after the simulation drive signals are developed and
prior to the start of the test.
The SWIFT sensor includes several mechanical and electrical components.
Slip Ring Assembly
Transducer
The transducer attaches directly to a modified wheel rim. On the test track, it
spins with the wheel. It does not spin on a road simulator. The transducer is
available in two materials: aluminum for spinning applications where the priority
is on light weight, and titanium for non-spinning or higher force applications,
where the priority is on durability.
The transducer’s unibody design means there are no multiple parts welded or
screwed together.
The transducer has four beams with strain gages that measure six orthogonal
outputs:
Fx—longitudinal force
Fy—lateral force
Fz—vertical force
Mx—overturning moment
My—acceleration and brake torque
Mz—steering moment
It has onboard conditioning and amplifiers to improve the signal-to-noise ratio.
S20-57
Modified Rim
Hub Adapter
Transducer
Slip Ring
Bracket
Slip Ring
Encoder