Although significant improvement has been made, errors of alignment and stability remain.
Errors of alignment of the gear drive due to shaft deflections are considered as input data in the analytical procedure.
A version of a worm gear drive with improved bearing contact, reduced level of transmission errors and lessened sensitivity to errors of alignment is proposed.
The developed methods enable to provide: (i) a localized bearing contact less sensitive to errors of alignment, and (ii) reduced vibration and noise.
A predesigned parabolic function of transmission errors is provided in order to absorb transmission errors caused by errors of alignment and reduce the level of vibrations, especially in the case of application of multi-thread worms.
The pinion-gear tooth surfaces are in point contact, the bearing contact is localized and oriented longitudinally, edge contact is avoided, the influence of errors of alignment on the shift of bearing contact and vibration and noise are reduced substantially.
The great advantages of the developed gear drive in comparison with the previous ones are (i) reduction of noise and vibration caused by errors of alignment, (ii) the possibility of grinding and application of hardened materials, and (iii) reduction of stresses.
Reducing the rotational error of fixator alignment from 10° to 5° resulted in a 50% decrease in elbow motion resistance.
Accordingly, the accuracy of state model and statistic characters of noise will be incorrect, which consequently increases the error of transfer alignment.
Furthermore, comparisons between the 3D models were undertaken looking at the convergence and RMS error of the alignment, and deviation values (standard, mean, upper and lower deviation).
In addition, this correlation analysis provides an estimation of the local error of image alignment by measuring the displacement of the correlation peak within the correlation volume: this error was systematically below the cell size, corresponding to the error on cell position estimation (5-10 µm, i.e. the average diameter of a RG cell).
