Full
Outline
Aiming at the problem of deflection when the projectile obliquely penetrates a multi-layer target, a theoretical calculation model of the projectile deflection caused by the oblique cone structure of the projectile tail is established, and the change rule of the deflection with the tail structure is obtained at the working conditions of the velocity of 0.2−1.2 km/s, the angle of attraction of −30°−20°, the radius of the projectile body of 30–60 mm, and the angle between bevel plane of tail and the projectile shaft of 0°−4°. Moreover, the accuracy of the model is verified by comparing with the test results. The results showed that the tail of the projectile forms a negative deflection moment and the projectile produces a “head down” effect when the tail of the projectile penetrated upward target, and the tail of the projectile forms a positive deflection moment and the projectile produces a “head up” effect when the tail of the projectile penetrated downward target; the deflection moment of vertical axis is about 100 times greater than that of parallel axis. The deflecting moment can be increased by increasing the angle between bevel plane of tail and the projectile shaft, the length of the tail, and the radius of the projectile. Increasing the angle between bevel plane of tail and the projectile shaft is more effective in increasing the deflection moment than increasing the tail length.
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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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