New general correlations for opening shock factor of ram-air parachute airdrop system

Si Yu Zhang; Li Yu; Pierangelo MasaratiBo Wen Qiu

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New general correlations for opening shock factor of ram-air parachute airdrop system

机译：New general correlations for opening shock factor of ram-air parachute airdrop system

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The attainability of the opening process directly determines the success of a ram-air parachute airdrop system. The opening shock is the most concerned parameter for designers. Focusing on the parachute opening process, the peak load is evaluated using the opening shock factor, which is obtained using the dynamic model and the Momentum Impulse theory. Comparisons with airdrop test results show that the two methods can accurately predict the peak load. In the similarity analysis of parachutes, the criteria for flexibility, elasticity, and air permeability are summarized, and the dimensionless numbers affecting the opening shock are identified as the mass ratio, the Froude number, and the Strouhal number. The frame design of the ram-air parachute airdrop system is completed, and a database of opening shock factors including airdrop test data and numerical results is established. New general correlations for the opening shock factor are presented for vertical and horizontal opening utilizing the Levenberg-Marquardt method for regression analysis, with R~2 of 0.9935 and 0.9880, and MAPE of 3.45% and 2.64%, respectively. The new correlations can quickly and accurately predict the opening shock for ram-air parachute airdrop systems.

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来源
《Aerospace science and technology》 |2022年第10期|107844.1-107844.8|共8页
作者
Si Yu Zhang; Li Yu; Pierangelo MasaratiBo Wen Qiu;
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作者单位

Key Laboratory of Aircraft Environment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China, Department of Aerospace Science and Technology, Politecnico di Milano, 20156 Milan, Italy;

Key Laboratory of Aircraft Environment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

Department of Aerospace Science and Technology, Politecnico di Milano, 20156 Milan, Italy;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Ram-air parachute; Opening shock factor; Peak load; Correlation; Dynamic model; Momentum impulse theory;

New general correlations for opening shock factor of ram-air parachute airdrop system

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