Study on kinematic dexterity prediction and related factor in adjustable jet nozzle

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.