螺旋颤振分析

 对于装有螺旋桨发动机、涡轮螺桨发动机的飞机,存在着螺桨与发动机组合的螺旋颤振稳定性问题。本文介绍~种实用的分析方法,取沉浮、侧向平动、俯仰、偏航4个自由度,以准定常方法计算出螺旋桨气动力,并计入陀螺力矩,形成系统状态方程,然后提取特征值,以确定系统的稳定性。算例中还对影响稳定性的若干参数进行了分析。

WHIRL FLUTTER ANALYSIS

The whirl flutter stablility of the engine-propeller installation is related to the aircraft with propeller, turboprop, or propfan engines. In this paper a practical method is presented to analyse the problem. In the analysis four degrees of freedom, namely vertical and horizontal displacements, pitch and yaw, are considered. Quasi-steady propeller aerodynamics and gyroscopic moment are added to the dynamic equation. From the system slate equation obtained . eigenvalues, eigenvecters are abstracted to predict and analyse the system's stability. Based on an example data, the effects of several parameters on the stability are also studied.