The digital measurements of the back cover of a telephone receiver were carried out by a three dimensional measuring machine and the data point clouds of the contours were got. Using reverse engineering software, Imageware, the data point clouds were processed, including of data smoothing, data reducing, data point clouds resample, feature lines extracting and curve fitting. Based on the shape features of the research object, the 3D model of the back cover of the telephone receiver were reconstructed with the boundary curves and the scanning data point groups successfully. Precision evaluation was carried out to the 3D model and the error controlled within 0.2mm.

This paper has introduced the method how to establish a model for the virtual prototype of new type folding-arm gondola CD 250 based on the ADAMS technology, then to do analyses and inspection for the built virtual prototype, and to combine the test results with the traditional DOF calculation to sum up the feasible calculation method for DOF, finally, further verify the rationality of the model, which provides the necessary foundation for subsequently utilizing the virtual prototype technology to analyze the working condition of the gondola.