Improved GPS Product Measurement Certification Based On Uncertainty

Measurement certification is very important to ensure the quality of geometri-cal product. According to the requirement of improved GPS (geometrical productspecification), the result of product's measurement certification is implemented by us-ing uncertainty principle to related design and verification process. In this process,design and certification form an object-image correspondence system to ensure theconsistency between the two stages. It consolidate design standard and metrology cer-tification, which resolves the dispute between certification and design of product. Themain contents of this paper are as follows:On the basis of conventional uncertainty of GUM, method of evaluation of im-proved GPS measurement uncertainty based on fuzzy set theory and Monte Carlosimulation is studied. In view of fewer data sample and unknown distribution, themethod of measuring uncertainty based on fuzzy set theory is put forward. Evaluationmethod of measuring uncertainty based on Monte Carlo Simulation is also put forwardbecause of the complexity of uncertainty between related uncertainty components forindirect measurement.The process for the improved GPS product measurement certification based onmeasurement uncertainty is established. According to this process, two di?erent mea-suring processes to measure the work piece of intermediate diameter of external threadare carried out. And the qualification of the measuring results is also testified.The process for the improved GPS product measurement certification based onthe compliance uncertainty is established. On the basis of measurement uncertaintymentioned above, the causes to result in specification uncertainty are investigated. Thecalculation model for the compliance uncertainty is proposed. Based on the proposedprocess, experiment study is given through ?atness measurement and verification ofwork piece plane using CMM.The prospect of application of improved GPS knowledge library is investigated.The prototype of application platform of measurement certification is developed basedon the improved GPS. The intermediate diameter of external thread is used as anexample to validate the proposed platform.In this paper, application research of improved GPS uncertainty theory will specifythe geometrical product's measurement certification, and provide references for theapplication and popularization of improved GPS in engineering practice.This thesis is financially supported by National Science Foundation of Guangxi,named"Research on Calculation Model and Method for the improved GPS"(No.0640166).