Simulation > Mechanism Design and Mechanism Dynamics > Mechanism Design > Creating Mechanism Models > Modeling Entities > Servo Motors > About Settings for SCCA Motor Functions
About Settings for SCCA Motor Functions
The parameters of an SCCA function are defined as follows:
• A= Fraction of normalized time for increasing acceleration
• B= Fraction of normalized time for constant acceleration
• C= Fraction of normalized time for decreasing acceleration
where
• A + B + C = 1
You must provide values for A and B, as well as the amplitude and period of the SCCA profile.
• H = Amplitude
• T = Period
The value of the SCCA setting is computed as shown in the following table:
y = H * sin [(t*pi)/(2*A)]
for 0 <= t < A
y = H
for a <= t < (A + B)
y = H * cos [(t – A – B)*pi/(2*C)]
for (A+B) <= t < (A + B + 2C)
y = –H
for (A+B+2C) <= t < (A + 2B + 2C)
y = –H * cos [(t – A –2B –2C)*pi/(2*A)]
for (A+2B+2C) <= t <= 2*(A + B + C)
where t is the normalized time and is computed by t = t_a * 2 / T
where t_a= Actual time and T= Period of the SCCA profile.
The profile repeats itself if the actual time is longer than the period of the SCCA profile.