2K-H Planetary Research Articles

Dynamic simulation of 2K-H type planetary gear inerter by Amesim

Dynamic simulation of 2K-H type planetary gear inerter by Amesim

A 2K-h Single-Row Planetary Gearbox Optimal Design with Genetic Algorithms

In conventional methods, designing a gear drive such as a 2K-h single-row planetary gearbox requires a very large number of calculations based on recommended gear standards, trial and error methods, etc. This time consuming process may often finish up with inadequate design outcomes. Therefore, in this paper a Genetic Algorithm (GA) methaeuristics is considered in order to resolve this complex design problem. The GA was used to find the optimal values of 14 genes (i.e. design variables) that define the planetary gearbox. The optimal design of the power transmission was evaluated considering the mass minimization criterion. The results of the optimised planetary gearbox suggest a reduction of the mass with 15.16% as compared with the situation when the traditional design was used.

Innovation of the Advanced Actuator

Actuator is a kind of swaying mechanism whose power source is the hydraulic pressure oil, which may be widely applied to varied occasions where need swaying mechanisms, such as aircraft, tank, ship, train, etc. An aircraft needed a most advanced actuator which can produce torque up to 28kg•m with its unit weight, and set strict demands on such indexes as weight, dimension. According to existing plan, an actuator was designed and manufactured, being far inferior to requirement, which adopted a complex gear train composed of 2K-H and 3K planetary reductors. On the basis of analyzing existing dozens of reductors, a new structure that achieves swaying with multi-start ball guide screw driven by reciprocating piston rod of high-pressure oil cylinder was put forward. Having analyzed and compared more than ten new type of plans, a structural model of straight-rotary ball pair was proposed, an ideal plan of identical radius ball-return was found, a new spatial tight ball-return curve was designed, and the optimal design of the advanced actuator was finished. Computer simulation and prototype experiment made clear that each index of the advanced actuator could satisfy the aircraft’s demand.