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At present, iFEM (inverse finite element method) is one of the most promising methods to construct a structural strain field. The purpose of this method is to obtain a structural strain field that meets the precision requirement with the least number of real measuring points in the process of discrete strain acquisition. However, when it is difficult to collect strain data in some local areas, discrete strain data can be collected by combining virtual and actual measuring points. In this paper, the stiffened plate of a typical ship structure was taken as an example, according to the measured data, combined with the simulation model and the measurement point regression method of Xgboost, the strain field reconstruction accuracies of the three methods of measurement, simulation and virtual and real combination were calculated based on the iFEM technology, and the causes of error were analyzed. The prediction results showed that the average error of 47 physical measurement points was the lowest, which was 1.92%.When 15 points and 21 points were input through the virtual-real combination path, the errors between the results and the verification points were all less than 3%, which verified that the strain field reconstruction method of virtual-real combination with a quick supplement of the missing data has strong operability and high accuracy.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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