The Method of Reducing the Shock of Stamped Parafoil Opening

Abstract

The invention relates to a method for reducing the opening shock of a ram air parachute. The method for reducing the opening shock of the ram air parachute comprises the following steps that an air inlet parachute cord at the front edge of the ram air parachute is used as a non-bundled parachute cord and the rest parachute cords of the ram air parachute are used as bundled parachute cords; the bundled parachute cords are divided into a plurality of groups in sequence from the rear edge of the ram air parachute to the front edge of the ram air parachute, wherein the parachute cords in each group are symmetric relative to the center of the airfoil of the ram air parachute; the parachute cords in each group are bundled and tightened together by using a binding rope and the binding point is atthe center of the airfoil; the positions of all binding points move down in sequence from the rear edge to the front edge; the strengths of all binding ropes are reduced in sequence from the rear edge to the front edge; when the ram air parachute is unfolded, an air chamber is unfolded to be inflated from the front edge and the rear edge under the driving of the non-bundled air inlet parachute cord; in the inflating process, the parachute cords, which are tensioned in sequence from the front edge to the rear edge, are enabled to snap the binding ropes in sequence from bottom to top; and meanwhile, the air chamber is gradually inflated until the air chamber is full of air. According to the method for reducing the opening shock of the ram air parachute, sliding cloth does not need to be closed up because the ram air parachute is unfolded step by step, the layer level of the parachute system can be reduced, and the implementation is simple.

Description

technical field [0001] The invention belongs to the field of airdrop parachutes, and in particular relates to a method for reducing the impact of punching parachute opening. Background technique [0002] Stamped parafoil is a new type of parachute. It is a kind of flexible aircraft similar to the airfoil that is sewn by the upper and lower layers of the micro air permeability material. The initial state of the stamped parafoil is folded and packaged in a flexible state. , as far as the current speed of the airdrop carrier is concerned, the stamped parafoil is generally opened under the condition of a relatively large parachute opening speed. large shock loads. [0003] In order to reduce the impact of the ram parachute opening, there are generally two methods. One is to use multiple parachutes to form a multi-stage deceleration system, but the structure of the multi-stage deceleration system is complicated and the reliability is reduced; The slider controls the opening of ...

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the impact of the ram parachute opening, there are generally two methods. One is to use multiple parachutes to form a multi-stage deceleration system, but the structure of the multi-stage deceleration system is complicated and the reliability is reduced; The slider controls the opening of the parachute, but it is difficult to match the size of the closing slider. Generally, the size of the closing slider and the size of the wing surface are estimated, and a ratio is set. However, the load reduction effect of the slider needs a lot of experiments to evaluate, especially the wing surface When it is an irregular shape such as an ellipse, the design of the sliding cloth is more difficult

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