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.
On assessment of geometric errors
SUMMARY Measurements are carried out on engineering components and analysed to check the conformity of the components to specification. This paper discusses different methods that are useful for assessing the errors on the dimensions, form and position of geometric features. A new approach called the median technique, which gives minimum values of errors is introduced.