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| Dynamic Simulation Analysis of Ship-borne Tethered Balloon Cable and Sphere in Marine Environment |
| Received:August 12, 2019 Revised:September 16, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.12.006 |
| KeyWord:ship-borne tethered balloon mooring rope dynamic simulation sphere attitude |
| Author | Institution |
| LIU Yong |
Laboratory of Low-frequency Electro-magnetic Communication Technology, No.722 Research Institute of CSIC, Wuhan , China |
| SHU Xin |
China Special Vehicle Research Institute, Jingmen , China |
| YUE Xin-xi |
Laboratory of Low-frequency Electro-magnetic Communication Technology, No.722 Research Institute of CSIC, Wuhan , China |
| LAI Zhen-hua |
China Special Vehicle Research Institute, Jingmen , China |
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| Abstract: |
| Objective To study the influences of shipboard tethered balloon on the mooring rope and sphere in marine environment. Methods In this paper, the ADAMS secondary development macro command was used to establish the discretization mooring cable model; and the bushing force was added between the adjacent micro-segment cylinders of the discretization tethered cable geometry model. Relevant stiffness coefficient and damping coefficient were set to obtain the cable model of the complete special effect. Meanwhile, considering the movement effects of the hull roll 5° and the pitch 2°, the hull movement was analyzed according to the relevant design specifications of the marine crane. It can be seen that the position of the lower end of the mooring cable at the lower end of the tether was more fluctuating than the roll. The larger the amplitude, the greater the impact on the cable, so impact of the hull 2° on the tethered cable was mainly analyzed and the influence of the hull static and the hull pitch 2° on the tethered cable and the attitude of the ball on the ship was analyzed and compared. Results The tension curve of the tethered balloon tethered cable and the attitude change curve of the ball under the influence of the hull static state and the pitching excitation were obtained. The results showed that the tethered cable born a large impact load at the beginning of the simulation when the hull was tilted by 2°. When the peak value reached 150,000N, and the cable load was basically floating at 25000N. The tension change curve showed a periodic change as a whole, and the period was consistent with the hull pitch period of 10s. The ball roll angle and heading angle change were basically consistent with the hull static simulation results, and the ball pitch angle changed greatly. Conclusion When the hull is tilted, it will bring a large impact load to the tethered cable and affect the pitch attitude of the ball. The simulation results have great guiding significance on feasibility analysis and suitability of the carrier-based captive balloon and the selection of the tethered cable. |
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