| The straight-rotary actuator is a kind of motion transfer mechanism to transform the linearmotion to rotational motion. The double helix straight-rotary actuator is a motion transfer mechanismwith large helix angle, which can be applied in flap of the plane, helicopter rotor and compartmentdoors of the ship and aircraft. It has advantages of simple structure, small dimension and large outputtorque.The working principle of the double helix straight-rotary actuator is introduced in the paper.According to the calculated values of its structure parameters, the detailed structure is designed. Andthe relation between input force and output torque is derived.According to the structure of the double helix, angular velocity and displacement are analyzed byADAMS. Compared with theoretical calculation, the analysis result verifies the correctness of themechanism’s motion relationship. Based on its kinematics model, defining the contact force in screwengagement, the dynamic model is built. And the angular velocity, angular acceleration and forcecondition are studied with the dynamic model.The forced deformation of the key parts on the condition of the maximum load is analyzed withfinite element method. And the stress and displacement distribution are predicted. The contact stressand deformation of the screw engagement is analyzed with numerical simulation. It provides reliablebasis for the structure design of the actuator.The first six modes of the mechanism are extracted with finite element method. And the modefrequency and mode shape of each mode are obtained.The stress-strain behavior at the instantaneousimpact load is studied by explicit dynamic analysis with ABAQUS/Explicit. |
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