Hi, my friends:
the source codes following:


In the file motion/control.c,line1116:,in the function of get_pos_cmds():
the vel_req is calculated by the expression as showed above.
my question is:what,s the meaning of the expression?
or is it from a formula? If true,what,s the formula? Now,i can conclude that 
the value of vel_req is the root of the quadratic equation.
which is :(1/2) * x^2 +  max_dv * x -  (joint->acc_limit) * pos_err  = 0
But i don‘t konw how can we get the equation? Is it from  the concept of  
conservation law of work and energy ?
Thanks,
Regards!
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