螺旋桨向量平衡

螺旋桨旋转时各桨叶的离心力可分解为在桨叶轴线旋转平面内的静不平衡力和垂直于此旋转平面的动不平衡力偶。由于各桨叶不完全相同,这两种不平衡度在不同矩角位置会有差异。但所加静平衡力和动平衡力偶则不随变矩而变化,它们的平衡作用在所有矩角位置都是一样的,可以采用本文所述的向量分析方法,在特制的向量平衡图上预测对各矩角平衡的结果。这样就可以只需一次平衡即使各矩角都平衡合格并达到最佳平衡状态,而用常规平衡方法需要反复凑试甚至无法合格。

VECTOR ANALYSIS METHOD FOR PROPELLER BALANCING

The centrifugal forces of blades of a set of propeller during rotating may be resolved into two parts: static unbalanced force acting in the rotating plane of blades and dydamic unbalanced couples acting perpendicularly to the rotating plane. The blades of a set of propeller being not exactly identical,both the static and dynamic unbalanced force and couple are different at different pitch angle,but the applied balancing force and ciuple on the balde will not change at different pitch angle. By employing the vector analysis method and a special vector balancing diagram mentioned in this paper,the balancing result at every pitch angle is easily estimated. The balancing only needs once to meet the specification at all pitch angle ,and furthermore the optimum balancing is obtained. The method of vector analysis is better than the existiing method usually used,which needs "try and error"to balance and cannot make sure whether it meets the demand of balancing.