Rotors with curvic couplings

which are separately prestressed from the front part and the rear part

are often applied to modern turboprop and turboshaft engines.It is very important but difficult to determine the values of preloads for a rotor.The prerequisite of the axial relaxed/pressed forces caused by variety of rotor loads in operation is available

the criteria to determine the axial preloads of rotors are proposed in this paper

which takes into account synthetically the factors

such as tightness margin

strength margin

assembling relationship and etc.Hence the optimiztion model of the axial preloads is established

and the corresponding solution is presented.The computer program is developed according to the presented criteria and method.Finally

an example is given.