摘要
轴向柱塞泵因其高功率密度,在航空电静液作动器(EHA)及飞机控制舵机等关键液压系统中得到广泛应用。然而,传统的刚性主轴假设忽略剪切变形与旋转惯性效应,无法准确描述高速工况下主轴的挠曲变形特性,导致其振动响应计算存在偏差。本文基于Timoshenko梁理论建立主轴柔性化模型,采用集中参数法构建包含主轴柔性变形与缸体振动的刚柔耦合动力学模型,并采用显隐结合法进行高效求解。显式预测与隐式修正交替迭代的显隐结合法解决了传统方法计算效率低、收敛困难等问题。不同工况下的研究结果表明,出口压力与转速对系统振动特性影响显著。当出口压力从5 MPa增至20 MPa时,缸体Y方向振动位移增幅达363%,主轴X方向挠度增幅289%;当转速从12000 r/min升至20000 r/min时,由于受斜盘支反力影响,转速对X方向缸体振动响应和主轴挠度影响不大,而在Y方向上,由于离心力的作用,缸体振动响应与主轴挠度均明显增大,并加剧缸体的倾覆趋势。通过搭建刚柔耦合动力学模型,揭示了缸体振动与主轴变形的双向作用机制,对航空高速轴系动力学分析提供了新的研究思路。
Axial piston pumps are extensively employed in critical hydraulic systems such as aircraft electrohydrostatic actuator(EHA)and flight control actuators,owing to their superior power density characteristics.However,the traditional rigid shaft assumption fails to accurately describe shaft deflection under high-speed conditions,leading to deviations in vibration response predictions.This paper develops a flexible shaft model based on Timoshenko beam theory and constructs a rigid-flexible coupled dynamic model using the lumped parameter method.An explicitimplicit hybrid approach is proposed for efficient solution.The hybrid method,alternating explicit prediction and implicit correction,overcomes the computational inefficiency and convergence challenges of traditional methods.Results show that outlet pressure and rotational speed significantly affect system vibration.When the outlet pressure increases from 5 MPa to 20 MPa,the Y-direction displacement of the cylinder rises by 363%,and the X-direction deflection of the shaft increases by 289%.As rotational speed increases from 12000 r/min to 20000 r/min,its effect on X-direction responses remains limited due to the counteracting force from the swash plate.However,centrifugal effects significantly amplify Y-direction vibration and shaft deflection,intensifying the cylinder's overturning tendency.By establishing a rigid-flexible coupled dynamic model,this study reveals the bidirectional interaction between cylinder vibration and shaft deformation,providing new insights for aircraft high-speed rotor dynamic analysis.
作者
叶绍干
石楠
郑晨亮
鲍岳
Ye Shaogan;Shi Nan;Zheng Chenliang;Bao Yue(Xiamen University,Xiamen 361102,China)
出处
《航空科学技术》
2026年第3期43-50,共8页
Aeronautical Science & Technology
基金
国家自然科学基金(U24B2049,52175062)
航空科学基金(20220007068002)。
