Erik Kostson
Ansys Employee

If you look in the manual like I told you will find that:

'The acceleration of a typical DOF is given by Equation 15ÔÇô12 for time . By default, the acceleration vectoris the average acceleration between timeand time , since the Newmark assumptions (Equation 15ÔÇô8 and Equation 15ÔÇô9) assume the average acceleration represents the true acceleration.'

So everything is explained in the theory manual, and beyond that we can not provide any specifics - everything publicly available is in the manual.

Thank you