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High-precision monitoring of the thrust of the propulsion shafting is of great significance for the ship rapidity prediction, hull-engine-propeller matching, and health management of the shaft. However, for the super-long propulsion shafting, because of its large span, small slenderness ratio (ratio of the radius to the length of the shaft) and large thrust, the shaft will produce severe bending-longitudinal coupling nonlinear deformation, which will have an important influence on the thrust measurement based on deformation information such as strain or displacement. Therefore, the bending-longitudinal coupling nonlinear effect of the propulsion shafting on the thrust measurement accuracy was studied. Considering the Von Karman nonlinear displacement-strain relationship, a nonlinear mechanical model of the propulsion shaft was established by using the Hamilton variational principle combined with the finite element method. The bending-longitudinal coupling effect on the displacement, strain and thrust measurement errors was studied. The results show that at low rotation speeds, the bending-longitudinal coupling effect is weak and has little effect on the thrust measurement. However, at high rotational speeds, ignoring the bending-longitudinal coupling effect will cause large measurement errors (the error can reach 13.95% at 240 r/min). Besides, the closer the measuring point is to the propeller, the stronger the bending-longitudinal coupling effect will be, and the larger the thrust measurement errors will be. Therefore, arranging the measuring point near the thrust bearing at the front end of the shaft can effectively reduce the measurement errors caused by the bending-longitudinal coupling effect. The research results have guiding significance for the thrust measurement of super-long shafts with large spans and small slenderness ratios.
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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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