Improved velocity model in the Riera impact loading formula for commercial large aircrafts on the basis of energy conservation principle

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (22) : 143-149.

LI Jianbo1,2,YANG Kai1,2,MEI Runyu1,2

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Abstract

The Riera formula plays an important role in the evaluation of aircraft impact loading for the safety assessment of nuclear power plant containment.However, due to the assumption of short time duration and constant velocity, the traditional Riera formula based on the momentum theorem maybe greatly overestimate the loading magnitude in the large aircraft impact analysis.It leads to an applicability problem about the Riera formula.By using the fine model of the common commercial aircraft of 767-200ER and A340-300, the impact loading time history curve was extracted from the nonlinear simulation process of the aircraft impact, and compared with the Riera formula results in detail.Further, based on the energy conservation principle, an improved bilinear velocity model for the Riera formula was proposed, with a detailed numerical implementation algorithm.The numerical examples show that the new proposed method can provide a more reasonable technique procedure for the loading assessment of the anti-impact ability of nuclear power plants against commercial large aircraft impact.

Key words

conservation of energy / velocity model / loading evaluation model;aircraft impact;nuclear power plant containment

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LI Jianbo1,2,YANG Kai1,2,MEI Runyu1,2. Improved velocity model in the Riera impact loading formula for commercial large aircrafts on the basis of energy conservation principle[J]. Journal of Vibration and Shock, 2020, 39(22): 143-149

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