Abstract
Aviation axial piston pump is an important energy conversion component in aircraft hydraulic system, and the study on the nonlinearity of key operating mechanism is very necessary for improving the reliable operation of the pump. Addressing the aviation axial piston pump, this article analyzes nonlinear dynamic characteristics of the center spring return mechanism by using theoretical analysis and numerical simulation. Firstly, mathematical models of oil-film forces of slipper/swash plate pair and cylinder/port plate pair are derived. Then, based on the nonlinear dynamic theory, some specific theoretical analysis methods such as Lyapunov index spectrum, bifurcation diagram, time series, phase plane portrait, Poincaré map, and power spectrum are used to carry out the numerical simulation of nonlinear dynamic behaviors. The result indicates that characteristics of the center spring can reveal the reason for the nonlinear vibration of the center spring return mechanism. Meanwhile, the behavior of the oil thickness of slipper/swash plate pair is in the periodic and steady motion, and the variation of the oil thickness of cylinder/port plate pair is in chaotic vibration, which establishes the theoretical foundation of the aviation axial piston pump for the traceability and suppression of vibration. The obtained results are of important guidance significance for optimal design and dynamic control of the center spring return mechanism of aviation axial piston pump.
Highlights
In order to improve the power density of aviation axial piston pump, it is a great challenge to make the pump at a high speed and high-pressure working condition, when considering the local elastic-plastic stress deformation and thermal deformation of the rotating component.[1,2] The aviation piston pump is in nature a complex nonlinear, time-variant, and multi-variable system, which contains the correlation among hydraulic system, mechanical system, and the electric control system.[3,4] The anomalies and failures of the center spring return mechanism (CSRM) are often caused by nonlinear vibration, noise, leakage, impact and so on,[5,6] which seriously affect the motion stability and control precision of aviation axial piston pump
The result indicates the variation of oil thickness of cylinder/port plate pair is in chaotic motion, which establishes the theoretical foundation of the aviation axial piston pump for the traceability and suppression of vibration
Nonlinear dynamic characteristics of CSRM of aviation axial piston pump are discussed in this work
Summary
In order to improve the power density of aviation axial piston pump, it is a great challenge to make the pump at a high speed and high-pressure working condition, when considering the local elastic-plastic stress deformation and thermal deformation of the rotating component.[1,2] The aviation piston pump is in nature a complex nonlinear, time-variant, and multi-variable system, which contains the correlation among hydraulic system, mechanical system, and the electric control system.[3,4] The anomalies and failures of the center spring return mechanism (CSRM) are often caused by nonlinear vibration, noise, leakage, impact and so on,[5,6] which seriously affect the motion stability and control precision of aviation axial piston pump. A mathematical model of CSRM of aviation axial piston pump was derived, and equations of oil-film forces of slipper/swash plate pair and cylinder/port plate pair were built. The equivalent mass block is influenced by the coupling action of multiple forces, mainly including the axial hydraulic pressure, the piston inertia force, the nonlinear spring force, the friction between the piston and cylinder, and the oil-film force of slipper/swash plate pair.
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