E10350-161101
IPI
Page 11
4.5 CALCULATING TILT IN DEGREES
For example, Sensor
14384
gives an A-axis reading of 0.4137 V at 6.7°C. Then to
convert the tilt in mm/m in degree, following formula must be applied.
Tilt (degrees) = arcsin(Tilt
mm/m
/1000)
With previous reading
Tilt (degrees) = arcsin(38.1797/1000)
Tilt = 2.188°
4.6 CALCULATING DEVIATION
To calculate deviation over the gauge length of the sensor, use either formula below:
Deviation
mm
= Tilt
mm/m
* gauge_length
m
or
Deviation
mm
= sin(Tilt
deg
) * gauge_length
mm
For example, Sensor 14384 has a gauge length of 2 meters. The examples below use
the temperature corrected tilt values.
Deviation
mm
= 38.1797 mm/m * 2 m
Deviation
mm
= 76.3594
Deviation
mm
= sin(2.188) * 2000 mm
Deviation
mm
= 76.357
4.7 CALCULATING DISPLACEMENT
Displacement (movement) is the change in deviation:
Displacement = Deviation
current
- Deviation
initial
4.8 DIRECTION OF TILT AND DISPLACEMENT
Uniaxial sensors respond to tilt in the plane parallel to the wheels of the sensor. This
plane is called the A axis. A-axis readings may be positive or negative. Positive readings
indicate that the sensor is tilted in the direction of the fixed wheel. Negative readings
indicate that the sensor is tilted in the direction of the sprung wheel. Please refer to
Figure 13.
Biaxial sensors respond to tilt in the plane of the wheels (A-axis) and the plane rotated