Error analysis of rib curves based on measured data of airfoil-wainscot
The characteristics of accuracy control of large-scale airfoil-wainscot parts are analyzed. The accuracy of airfoil-wainscot is controlled by its rib curves, and the rib curves are straight lines whether after processing or before on the direction of face projection. The method of compensating the radius of measuring probe is presented also based on measuring data from 1D scanning probe. Aiming at the inspection requirement of the measured part and the characteristics of rib curves, the algorithms of curve matching and error analysis are proposed. The experimental results show that the proposed methods can meet the accuracy requirement of online inspection of airfoil-wainscot parts.
A New Method of the CMM Probe Radius Compensation
The probe radius compensated is necessary when we measure by the CMM.Based on analyses the existing methods of the probe radius compensation,a new algorithm named "4-point build a sphere" is proposed.The theory of the algorithm is expounded,at the same time,the way of gathering data and its operation speed are offered.And then,the precision of the algorithm is analyzed by computer simulation and how to improve the precision is introduced farther.And it's showed that the algorithm can satisfy a majority of measure and has application value.Finally,the algorithm is verified by an instance again.
SR topography of plastically deformed Fe-Si bicrystals - observation in situ and post mortem
SR reflection topography was applied to study the interaction of slip dislocations with the grain boundaries in Fe-4at%Si bicrystals deformed by compression. Three experimental settings with either a white or monochromatic beam were used and the corresponding orientation contrast analysed. Dislocation transmission through the grain boundary was observed in bicrystals with favourable geometry of the slip systems.