a rope slides frictionlessly down the edge of a table

[Analog_Engine.git] / AESL / TP1 04.11 TwoRaindrops.AESL

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-IDENTIFICATION DIVISION
-PROGRAM-ID TwoRaindrops
-VERSION 20240201
-COMMENT Two raindrops of same size and altitude are falling from a cloud.
-COMMENT How long does it take until the touch?
-COMMENT s'' = -2*gamma*m/s^2
-
-ENVIRONMENT DIVISION
-ENGINE Anabrid-THAT
-TIMEBASE 1ms
-REQUIRES COEFFICIENT 3, INVERTER 1, INTEGRATOR 2, COMPARATOR 1, MULTIPLIER 2, OPEN-AMP 1 
-
-DATA DIVISION
-OUTPUT OUTPUT.X s_limited
-COEFFICIENT.1 MIN_DISTANCE  # 2*radius of the raindrop
-COEFFICIENT.2 INIT_DISTANCE # initial distance -s0
-COEFFICIENT.3 FACTOR        # 2*gamma*m
-
-PROGRAM DIVISION
-+1 -> COEFFICIENT.MIN_DISTANCE -> 2r
-2r -> INVERTER -> -2r
--1 -> COEFFICIENT.INIT_DISTANCE -> -s0
-+1 -> COEFFICIENT.FACTOR -> 2gamma*m
-s'' -> INTEGRATOR -> -s'
--s', IC:-s0 -> INTEGRATOR -> s
-
-# The raindrops may only approach until they touch. Our model does not include their unification
-A:s, B:-2r, GT0:s, LT0:2r -> COMPARATOR -> s_limited
-
-s_limited,s_limited -> MULTIPLIER -> s^2
-
-# division 2gamma*m / s^2
-# Open amplifier is realized on THAT by FB:SUMMER.GND -> SUMMER
-2gamma*m, inp2 -> OPEN-AMP -> -2gamma*m/s^2=s''
-2gamma*m^2, s^2 -> MULTIPLIER -> inp2
-
-OPERATION DIVISION
-MODE REPEAT
-OP-TIME 12ms