The methods of calculating turbine axial differential expansion on-line and controlling axial differential expansion by c changing steam temperature increment were investigated.

In this article,based on the statics method,the calculation for the axial expansion of vertical heat exchanger with expansion joint was discussed.

To meet the requirement of 100% on-line inspection of gears in mass production in automotive and motorcycle industry, the two-flank principle is used to check the gear radial errors(thickness, radial composite error, run-out and error burs)and the gear axial errors(mean helix error, helix error and taper error)to realize the quick on-line inspection of gear machining flaws.

This paper, part seven of "Analysis of Errors and Inspection Groups on Hobbing Gear", dis- cusses the reason why the axial error occurs, the mathematical model and the relation between tol- erance group Ⅲ and axial error.

In this paper,the existing best-fit calculation,so as to the existence of axial RMS minimum goal for the design of the match,the current method of calculating the axial error is discussed,pointing out that some places a little unreasonable,a more accurate calculation of the axis to the formula for calculating the error and gives the derivation process.

In order to investigate the influence of slot type of inner plate in liquid viscous coupling on hump phenomenon, the relations between the axial force difference on inner plates and the factors such as plate beveled edge, beveled edge height, the position of inner plate were simulated by the FLUENT software.

Research results indicate that when the single ball lens is used in the LD-ball lens-SMF system,the axial alignment tolerance is ±30 μm,the lateral alignment tolerance is ±1.