IAI America SCON-CA - Manual (Page 348)

Chapter 10
Appendix
338
2) Calculation of Continuous Operation Thrust
Figure out the continuous operation thrust F t by following the formula.
First, check the operation pattern of t 1a /t 1d /t 2a /t 2d to find out that
Arrival speed (Vmax) = 0.05 × 0.098 � 0.07m/s and,
therefore it is greater than the set speed 62mm/s (0.06m/s), thus the pattern is the trapezoid
type.
Therefore, t 1a /t 1d /t 2a /t 2d = 0.062/0.098 � 0.63s.
Secondary, if calculating t
1f
/t
2f
;
Rated speed movement distance = 0.05 – {(0.062 Ч 0.062) / (2 Ч 0.098)} Ч 2 � 0.011m, thus
t
1f
/t
2f
= 0.011 / 0.062 � 0.17s
Also, if calculating F
1a
/F
1f
/F
1d
/F
2a
/F
2f
/F
2d
from the formula;
F 1a = F 2d = (9 + 100) Ч 9.8 – (9 + 100) Ч 0.098 � 1058N
F 1d = F 2a = (9 + 100) Ч 9.8 + (9 + 100) Ч 0.098 � 1079N
F 1f = F 2f = f w = (9 + 100) × 9.8 � 1068N
If substituting the values above to the continuous operation thrust formula;
F t =
F 1a
2 × t 1a + F 1f
2 × t 1f + F 1d
2 × t 1d + F 0
2 × t 0 + F 2a
2 × t 2a + F 2f
2 × t 2f + F 2d
2 × t 2d + F w
2 × t w
t
=
{(1058 Ч 1058) Ч 0.63 + (1068Ч1068) Ч 0.17 + (1079 Ч 1079) Ч 0.63 + (19600 Ч 19600) Ч
3 + (1079 Ч 1079) Ч 0.63 + (1068 Ч 1068) Ч 0.17 + (1058 Ч 1058) Ч 0.63 + (1068 Ч 1068) Ч 2}
/ (0.63 + 0.17 + 0.63 + 3 + 0.63 + 0.17 + 0.63 + 2) � 12113N
Since the answer exceeds 10200N, which is the rated thrust of Ultra-High Thrust Actuator 2
tone type, the operation is not allowed with this operation pattern.
Now, try to extend the standby time (to lower the duty).
In this case, F t = 9814N assuming t w = 6.12s (t = 12s), thus the operation is available.