发动机可调尾喷管灵活性预测及其影响因素研究

Study on Kinematic Dexterity Prediction and Related Factor in Adjustable Jet Nozzle

关键词:  动作响应  表面粗糙度  尺寸公差  等效摩擦

Key words:  Action response  Surface roughness  Dimension tolerance  Equivalent friction

摘要:

为了能够利用尾喷管同步环推力测试实验评估其合格率，提出了可调尾喷管灵活性仿真预测方法，并利用动力学模型研究了零件表面加工精度和几何公差对其灵活性的影响规律。结果表明:随着表面粗糙度等级的降低，可调尾喷管调节片与密封片之间的摩擦阻力增大；在尺寸公差为(-0.1，+0.1)，零件几何尺寸越大，调节片与密封片之间的摩擦阻力越大；在表面粗糙度为不大于Ra6.3条件下，基于基本尺寸和最小极限尺寸建立的动力学模型能够满足伸展和收缩过程动作响应灵活性要求(0.2s内)。因此，为了满足可调尾喷管伸展和收缩灵活性要求，其各零件公差应控制在下偏差范围内，并相应提高表面加工质量。

Abstract:

In order to evaluate the pass rate of adjustable jet nozzle through the test experiments of synchronizer ring thrust，the simulation method of kinematic dexterity prediction with the dynamic model of adjustable jet nozzle was put forward，and numerical simulation for dynamic model considering surface machining precision and parts tolerance was carried out to study effects on the kinematic dexterity. It was concluded that frictional resistance between the adjustment boards and seal boards increased with the decrease of roughness class and increase of parts dimension in the range of dimension tolerance (-0.1，+0.1). On the condition of no more than surface roughness Ra6.3，action response in the dynamic model，which built with the basic dimensions and least limit dimensions，can meet the flexibility requirement of extensional and contractile activity (0.2s). Therefore，in order to meet the flexibility requirement on extensional and contractile activity，dimension tolerances of parts should be controlled in the range of lower deviation，and the processing quality of parts surface should be improved.