OLC

The OLC function is able to calculate both the Occupant Load Criteria (OLC) and OLC++. OLC++ combines OLC with the time of maximum deformation (Tv=0) and the sliding mean integral over a window of 25 ms (SM25), as shown in the formulas below.

Syntax

OLC(time_vec, velocity_vec, flag, precision)

Argument

time_vec
Time vector of the maximum deformation.
velocity_vec
Velocity vector.
flag
The return argument specifies which value(s) should be returned by the function, and has the following options:
0
OLC (the absolute value of the slope).
1
OLC++ (returns one scalar value only).
2
Returns OLC curve X (time) vector.
3
Returns OLC curve Y (velocity) vector.
4
Returns Tv0 value.
5
Returns SM25 value.
6
Returns V0 value.
7
Returns OLC, TV0, SM25, and V0 values.
precision
Define precision for the algorithm. (default = 0)
0: accuracy ≤ 0.1 %
1: accuracy ≤ 0.001 %
Optional argument.
Note: Performance could be affected at high precision.
Algorithm for OLC


Figure 1.


Figure 2. Algorithm for OLC++


Example

Figure 3.


Note Text

High Precision
-------------
OLC = {olc(c1.x,c1.y,0,1)}
Low Precision without optional four arguments
--------------------------------------------
OLC = {olc(c1.x,c1.y,0)}
OLC++ = {olc(c1.x,c1.y,1)}
OLC curve X (time) vector = {olc(c1.x,c1.y,2)}
OLC curve Y (velocity) vector = {olc(c1.x,c1.y,3)}
Time at V=0 value = {olc(c1.x,c1.y,4)}
SM25 OLC function= {olc(c1.x,c1.y,5)}
V0 value = {olc(c1.x,c1.y,6)}
OLC, OLC++, TV0, SM25, and V0 values = {olc(c1.x,c1.y,7)}

Comments

Units are supported:
  • If available, units will be detected.
  • An error is raised for the wrong unit type (acceleration, displacement, and so on).
  • If a curve has no units, the expected units are s for the X vector and m/s for the Y vector.
  • To calculate OLC++, the starting velocity needs to be > 0.