Motion and Forces Analysis of the Drive Mechanism of Rotary Wobble-plate Engine Based on Phase Tuning

doi:10.3901/JME.2024.03.109

Abstract

Abstract: Rotary wobble-plate engines are widely used in the military field including underwater vehicles and torpedoes due to their advantages of compact structure and high specific power. The closed-form expressions of wobble-plate trajectory, piston displacement, and connecting rod swing angle are derived using the coordinate transformation matrix, which reveals the influence of engine structure parameters, including inclined axis angle and radius of wobble-plate, on the wobble-plate's motion and rod swing angle. Considering the spatial symmetry of the piston's configuration and the time symmetry of the changes in burning gas pressure, the force characteristics of the wobble-plate are analyzed using the phase tuning principle. The influence laws of harmonic orders of the burning gas pressure and the number of pistons on the force on the wobble-plate are revealed. The results show that the motion trajectory of the edge of the wobble-plate is an 8-shaped path on a sphere. The displacement of piston is different from the piston axial component of the connecting rod big end displacement due to the spatial swing of the connecting rod. The forces or moments on the wobble-plate can be balanced by adjusting the combination of piston count and the harmonic order of burning gas pressure.

Key words: wobble-plate engine, drive mechanism, motion law, force analysis, phase tuning

CLC Number:

TJ63

WEI Zhenhang, WANG Shiyu, XIA Chunhua. Motion and Forces Analysis of the Drive Mechanism of Rotary Wobble-plate Engine Based on Phase Tuning[J]. Journal of Mechanical Engineering, 2024, 60(3): 109-119.

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