Optimization technology for assembly sequence of fan rotor blades of aero-engine with odd-numbered blades
Aiming at the problems that the opposite angles blades'gravitational moment difference is difficult to guar-antee and the blades'gravitational moment distribution is not balanced in the assembly sequence planning process of aero-engine fan rotors with odd blades,the assembly sequence planning technology of odd blades was studied.A sin-gle blade was divided into two to form 33 pairs of"conjoined twin blades",and the original 33 rotor blades were converted into"66 virtual blades"to realize the conversion of the number of rotor blades from odd to even.Then,the opposite angles blades was found for each"virtual blade",but the"conjoined twin blades"could not be truly separated or placed in the opposite angles position.The gravitational moment difference of the"two virtual blades"at the opposite angles position was taken as the constraint,the remaining unbalance of the rotor as the optimization goal to plan the assembly sequence of the rotor blades by using the improved simulated annealing algorithm,which provided an optimized assembly sequence for the assembly of the rotor blades and optimized the static balance quality of the rotor.The verification results of an example showed that the conversion of the number of blades"from odd to even"realized the accurate guarantee of the gravitational moment difference of the opposite angles blades,and met the design index of the gravitational moment difference of the opposite angles blades(≤1 200 g·mm),which pro-vided an optimized assembly sequence for the assembly of rotor blades with an odd number of blades,and optimized the balance quality of the rotor.
gravitational moment difference of the opposite angles bladesconjoined twin bladesassembly sequence planningimproved simulated annealing algorithm
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