The total bending deformation of the ship navigating in waves may make the center distance of bearing supports of the gearing arranged along the ship longitudinal direction reduced,thus maybe make the gearing operate under the condition for the tooth double profile surfaces to engage~([1]).

This reduction of the center distance will lead to the additional radial pressure to develop between two engaging gears of the gearing,thus make the gearing operate under the condition for the tooth double profile surfaces to engage.

Under certain conditions, this reduction of the center distance will lead to create additional radial pressures between gearing teeth and between journals and bearings, thus make the gearing operate under the condition for the tooth double profile surfaces to engage.

The structure of a new-type double flank rolling gear tester developed abroad is introduced briefly.

Study on the measurement of gear helix position deviation by double flank rolling gear tester;

Gear in-line measuring machine based on double-flank gear rolling test with multi-degrees of freedom

The measurement principle of double-flank gear rolling test was applied in the existing fast gear inspection in workshop, because of its simple measurement principle, high efficiency, less requirements concerning the environment, and easy manufacturing of the master gear.

Experimental results of the air pumping of a serpentine inlet under ground running show that the total pressure recovery at the exit is low and the distortion at the exit is large.

Utilizing the combined experimental and computational method,the aerodynamic performance and internal flow pattern of a submerged inlet on the plane surface under ground running are obtained in this paper.