Effects Of Profile Errors Research Articles

Effects of profile errors on lubrication performance of helical gears

Analysis of the elastohydrodynamic lubrication (EHL) of gears generally assumes that the tooth flanks are smooth surfaces. There is considerable interest in establishing the extent to which smooth surface analyses are distorted by the presence of surface roughness. The current paper concerns a different scale of deviation from the specified surface profile, namely involute profile error. The paper quantifies the deviation from the smooth surface behaviour using standard profile error measurements, and also considers how the means by which profile error is measured influences the outcome/conclusions. Transient EHL analyses of the meshing cycle of helical gears taking profile error data from a gear measuring machine are compared with analyses using equivalent measurements determined by the waviness from surface profilometer measurements.

Dynamic performance of high-speed semi-rigid follower cam systems—effects of cam profile errors

This investigation examines the effects of cam profile errors on the dynamic behaviour of semi-rigid follower cam systems. The lift function is simulated stochastically, and integrated with a refined dynamic system model. It takes into account the lift error, which is considered to consist of a variable-mean size error and a superimposed waviness. The study has demonstrated that for semi-rigid follower systems, the combined effects of system flexibility and cam profile errors are significantly greater than that of flexibility alone, and that the effects of profile errors are dominating. The dynamic response is critically dependent on the waviness of the lift error, whereas a looser tolerance can be permitted for the size error.

Effect of profile errors with large correlation diameter on axisymmetric antenna crosspolarisation

The effect of profile errors with large correlation diameter on the boresight crosspolarisation of axisymmetric antennas is investigated. An expression for boresight isolation as a function of the correlation diameter, the r.m.s. surface error and the polarisation efficiency of the antenna is given. Curves of isolation as a function of the r.m.s. surface error and the correlation diameter are given for polarisation efficiencies of 0.99 and 0.999 (i.e. for antennas with peak off-axis cross-polarisation of −25.3 dB and −35.4 dB, respectively).