The Study Of Multi-component WFT And Application In Automobile Road Experiment

WFT(Wheel Force Transducer) was studied in this paper based on Ex-mechanical Ministry project and project sponsored by Jiangsu Automobile Engineering Stressed Laboratory(K2085), and automobile road experiment system was developed with practical engineering. The author's main research work and achievements were summarized as follows: 1) Study the structure of WFT. The improved wheel-type structure without mechanical coupling was designed in the paper after the elastic body feature of multi-component WFT was analyzed. Strain chip layout and bridge organization were carried out in order to measure six-degree-freedom loads, and finally calculating and decoupling equations were worked out. 2) Study of multi-component non-contact signal transmission system. A new non-contacted signal transmission system with electromagnetic induction and ray electricity was designed after some non-contacted signal transmission methods which were commonly-used in practice were discussed, and multi-component non-contacted signal transmission system and calibration method for each freedom were analyzed. 3) Analysis of sensor property distinguishing, decision-making and error compensation. Distinguishing and decision-making method based on information entropy was put forwards after the discussion of commonly-used methods, furthermore the index for information entropy decision-making was deduced for normal distribution. The error corrected model was put forward based on fuzzy reasoning in order to improve measure precision, and finally structure decomposed algorithm was used for multiple-dimensional system to reduce calculation complexity. 4) Study of coupling degree for multiple-dimensional system. Static and dynamic methods for evaluation of multiple-dimensional system were analyzed in this paper. The static methods included RGA (Relative Grain Array), statistics algorithm, CSC (Coupling Sensitivity Coefficient)etc., and method for coupling degree evaluation based on area integration was put forwards on the basis of CSC, furthermore some dynamic methods for coupling degree evaluation such as DRGA(Dynamic Relative Grain Array) and algorithm based on unit step signal were discussed. 5) Study of decoupling algorithms for multiple-dimensional system. Static linear and non-linear decoupling methods were analyzed in this paper, and decoupling method based on LUP (Loop Up Table) was worked out on the basis of static non-linear decoupling method, moreover the approximate decoupling algorithm based on diagonal predominance was put forward after the analysis of dynamic diagonal decoupling(Array Inverse) and steadiness decoupling. 6) Application and calibration of multi-component WFT. The calibration results were processed in this paper. Automobile road experiment data acquiring and processing system based on WFT was developed, and experiments were carried out to analyze system applications.