飞机地面气源机组动力系统悬置隔振设计

Vibration Isolation Design of the Suspension System of the Power Assembly for Aircraft Ground Air Start Unit

当飞机地面气源机组在平直道路上行驶时,最大的激振源是发动机的振动,路面不平顺度、气缸内燃气爆炸压力、运动件的不平衡惯性力周期性的变化都会使发动机整机系统和曲轴系统产生振动。降低发动机传递到车体的振动,提高车辆的乘坐舒适性和使用可靠性是飞机地面气源机组设计中的一个重要内容,从单自由度振动理论出发,结合有限元仿真软件,对目前某型飞机地面气源机组的发动机动力总成的悬置系统进行静支承分析和模态频率分析,为设计工作提供参考依据。

When the aircraft ground air start unit is running on flat and straight road,the largest excitation source is the engine vibration,however,the ground roughness,the air explosion pressure in the cylinder and the periodic variation of unbalanced inertial force of moving parts will cause vibration of the whole engine system and the crankshaft system.Reducing the vibration transmitted from engine to the vehicle body to improve the ride comfort and operational reliability of the vehicle is important in the design of the air start unit.Starting from single freedom degree vibration theory combining with finite element stimulation,the static support and modal frequency analysis are carried out for suspension system of the power assembly of a aircraft ground air start unit,providing reference for design.