阅读说明：本技术 多级开伞的飞行器着陆阻力伞主伞 (Aircraft landing drag parachute main parachute with multi-stage parachute opening ) 是由 夏婧琪 喻东明 张鑫华 吴飞 于 2019-10-29 设计创作，主要内容包括：本发明提供了一种多级开伞的飞行器着陆阻力伞主伞,伞衣上绑有约束绳,约束绳能限制伞衣的展开,伞衣上设有用于割断约束绳的切割器和用于触发切割器进行切割动作的触发装置,着陆减速时,触发装置根据开伞情况控制切割器依次割断约束绳,伞衣逐步开伞直至全部张满。避免了开伞冲击过大,提高了减速效果的持续性,缩短了滑跑距离,便于实施。(The invention provides a main parachute of an aircraft landing drag parachute with a multistage parachute opening function, wherein a restraint rope is tied on a canopy and can limit the expansion of the canopy, a cutter for cutting off the restraint rope and a trigger device for triggering the cutter to perform cutting action are arranged on the canopy, when the parachute lands and decelerates, the trigger device controls the cutter to sequentially cut off the restraint rope according to the parachute opening condition, and the canopy is gradually opened until the parachute is fully opened. The umbrella has the advantages of avoiding overlarge impact during opening, improving the continuity of the deceleration effect, shortening the sliding distance and facilitating implementation.)

1. The utility model provides an aircraft landing drag umbrella main umbrella of multistage parachute-opening which characterized in that: the canopy is tied with a restraint rope which can limit the unfolding of the canopy, a cutter for cutting off the restraint rope and a trigger device for triggering the cutter to perform cutting action are arranged on the canopy, when the canopy is landed and decelerated, the trigger device controls the cutter to sequentially cut off the restraint rope according to the parachute opening condition, and the canopy is gradually opened until the canopy is fully opened.

2. A multi-stage parachute opening aircraft landing drag parachute main umbrella of claim 1, wherein: the restraint rope is a closing rope, the closing rope is distributed at an opening at the bottom of the canopy, the length of the closing rope is sequentially increased from the bottom edge to the top edge of the canopy, the trigger device comprises a trigger circuit and a pressure sensor, the trigger circuit and the cutter are sequentially and electrically connected, the pressure sensor is used for detecting the pressure difference inside and outside the canopy and uploading the pressure difference to the trigger circuit, and the trigger circuit excites the cutter to perform cutting action according to the pressure difference inside and outside the canopy.

3. A multi-stage parachute opening aircraft landing drag parachute main umbrella of claim 2, wherein: when landing and decelerating, 1) the main umbrella starts to inflate until being restrained by the first-stage closing rope, the trigger circuit judges that the main umbrella is full when the pressure sensor detects that the pressure difference inside and outside the canopy reaches a first peak value, and the trigger circuit triggers the cutter to cut off the first-stage closing rope when the pressure sensor detects that the pressure difference inside and outside the canopy is reduced to a corresponding set value; 2) the canopy is continuously inflated until the canopy is restrained by the next-stage closing rope, the trigger circuit judges that the main canopy is fully opened when the pressure sensor detects that the pressure difference inside and outside the canopy reaches the next peak value, and the trigger circuit excites the cutter to cut off the next-stage closing rope when the pressure sensor detects that the pressure difference inside and outside the canopy is reduced to a corresponding set value; 3) and (5) repeating the step 2) until the canopy is fully inflated.

4. A multi-stage parachute opening aircraft landing drag parachute main umbrella of claim 1, wherein: the restraint rope is a girdling rope which is located near the waist of the canopy, the trigger device comprises a delay circuit and a pull rope, the pull rope is arranged on the canopy and is connected with a starting position of the delay circuit, the pull rope can be pulled out of the starting position of the delay circuit to start the delay circuit after the canopy starts to inflate to a certain degree, the delay circuit is electrically connected with the cutter, and the cutter cuts off the girdling rope when the delay circuit reaches a set time after being started.

5. The multi-stage parachute-opening aircraft landing drag parachute main umbrella of claim 4, wherein: when the umbrella is in landing and decelerating, the main umbrella starts to be inflated, the stay cord is pulled out of the starting position of the delay circuit to start the delay circuit after reaching a certain degree, the delay circuit reaches a set time after the main umbrella is inflated to be restricted by the girdling rope, the cutter cuts off the girdling rope, and the umbrella cover continues to be inflated until the whole umbrella cover is fully stretched.

Technical Field

The invention belongs to the field of aircraft landing, and particularly relates to a main umbrella of an aircraft landing resistance umbrella with multi-stage parachute opening.

Background

At present, the flat flying aircraft basically needs to adopt a drag parachute to decelerate when landing, and the drag characteristic of the traditional drag parachute is that the drag parachute starts to workThe area is generally a fixed value, in terms of resistance

Characteristic area of resistance C_sAt a certain time, the resistance provided by the resistance parachute is reduced by square times along with the reduction of the speed, the speed is continuously reduced along with the continuous speed in the process of speed reduction, the resistance provided by the resistance parachute is rapidly reduced, and the speed reduction effect cannot be continued.

The ideal deceleration performance should provide a relatively stable and continuous resistance in the process of full deceleration, especially for a large-tonnage aircraft, the kinetic energy to be converted for decelerating the speed from a higher value to a preset speed is very huge, the deceleration effect of the existing drag parachute is reduced by square times along with the reduction of the speed of the aircraft, the maximum deceleration capacity cannot be effectively exerted in the process of full deceleration to shorten the sliding distance as far as possible, and the drag parachute can generate a relatively large force when the speed is relatively high in the early deceleration stage, so that relatively large impact is brought to the structural strength of the aircraft and the drag parachute, which is a problem that the drag parachute has existed for a long time.

Disclosure of Invention

The invention aims to provide a main parachute of an aircraft landing resistance parachute with multi-stage parachute opening, which avoids overlarge parachute opening impact, improves the continuity of the deceleration effect, shortens the sliding distance and is convenient to implement.

The technical scheme adopted by the invention is as follows:

a main umbrella of an aircraft landing drag parachute with a multi-stage parachute opening function is characterized in that a constraint rope is tied on a canopy and can limit the expansion of the canopy, a cutter used for cutting off the constraint rope and a trigger device used for triggering the cutter to perform cutting action are arranged on the canopy, when the parachute lands and decelerates, the trigger device controls the cutter to sequentially cut off the constraint rope according to parachute opening conditions, and the canopy is gradually opened until the parachute is fully inflated.

As an improvement of the invention, the restraint rope is a closing rope, the closing rope is distributed at an opening at the bottom of the canopy, the length of the closing rope is sequentially increased from the bottom edge to the top of the canopy, the trigger device comprises a trigger circuit and a pressure sensor, the trigger circuit and the cutter are sequentially and electrically connected, the pressure sensor is used for detecting the pressure difference inside and outside the canopy and uploading the pressure difference to the trigger circuit, and the trigger circuit triggers the cutter to perform cutting action according to the pressure difference inside and outside the canopy.

Further, during landing and deceleration, 1) the main umbrella starts to be inflated until the main umbrella is restrained by the first-stage closing rope, the trigger circuit judges that the main umbrella is full when the pressure sensor detects that the pressure difference inside and outside the canopy reaches a first peak value, and the trigger circuit triggers the cutter to cut off the first-stage closing rope when the pressure sensor detects that the pressure difference inside and outside the canopy is reduced to a corresponding set value; 2) the canopy is continuously inflated until the canopy is restrained by the next-stage closing rope, the trigger circuit judges that the main canopy is fully opened when the pressure sensor detects that the pressure difference inside and outside the canopy reaches the next peak value, and the trigger circuit excites the cutter to cut off the next-stage closing rope when the pressure sensor detects that the pressure difference inside and outside the canopy is reduced to a corresponding set value; 3) and (5) repeating the step 2) until the canopy is fully inflated.

As another improvement of the invention, the restraint rope is a waist restraining rope which is positioned near the waist of the canopy, the trigger device comprises a delay circuit and a pull rope, the pull rope is arranged on the canopy and is connected with a starting position of the delay circuit, the pull rope can be pulled out of the starting position of the delay circuit to start the delay circuit after the canopy starts to inflate to a certain extent, the delay circuit is electrically connected with the cutter, and the cutter cuts off the waist restraining rope when the time reaches a set time after the delay circuit is started.

Further, when the umbrella is decelerated during landing, the main umbrella starts to be inflated, the stay cord is pulled out of the starting position of the delay circuit to start the delay circuit after the main umbrella is inflated to a certain degree, the delay circuit reaches the set time after the main umbrella is restrained by the girdling rope, the cutter cuts off the girdling rope, and the umbrella cover continues to be inflated until the umbrella cover is fully stretched.

The invention has the beneficial effects that:

the canopy is gradually opened until the canopy is fully opened, so that the drag parachute can provide resistance for the aircraft in a smaller area when the speed is higher in the early deceleration stage, overlarge parachute opening impact is avoided, the drag area is continuously increased along with the reduction of the speed in the deceleration process, the resistance which is reduced along with the reduction of the speed is supplemented, the continuity of the deceleration effect is improved, and the sliding distance is shortened; only the umbrella coat is additionally provided with the restraint rope, the cutter and the trigger device, so that the improvement is simple and the implementation is convenient.

Drawings

Fig. 1 is a resistance-time curve of a conventional drag parachute at deceleration.

FIG. 2 is a resistance versus time curve for deceleration according to an embodiment of the present invention.

Fig. 3 is a schematic view of an inflation process according to a first embodiment of the present invention.

Fig. 4 is a schematic view of the inflation process of the second embodiment of the present invention.

In the figure: 1-canopy; 2-umbrella rope; 3-a first-stage closing rope; 4-a second-stage closing rope; 5-third-stage closing rope; 6-a pressure sensor; 7-a wire; 8-a cutter; 9-restraining the waist rope.

Detailed Description

The invention is further described below with reference to the figures and examples.

The invention provides a main parachute of an aircraft landing drag parachute with multistage parachute opening, wherein a constraint rope is tied on a canopy 1 and can limit the unfolding of the canopy 1, a cutter 8 for cutting off the constraint rope and a trigger device for triggering the cutter 8 to perform cutting action are arranged on the canopy 1, when the landing is decelerated, the trigger device controls the cutter to sequentially cut off the constraint rope according to the parachute opening condition, and the canopy 1 is gradually opened until the canopy is fully inflated. Comparing fig. 1 and fig. 2, it can be known that the canopy 1 gradually opens the parachute until the parachute is fully inflated, so that the drag parachute can provide drag for the aircraft in a smaller area when the speed is higher in the early deceleration stage, thereby avoiding overlarge parachute opening impact, continuously increasing the drag area along with the reduction of the speed in the deceleration process, supplementing the drag which is reduced along with the reduction of the speed, improving the continuity of the deceleration effect, and shortening the sliding distance; only the umbrella coat 1 is additionally provided with the restraint rope, the cutter 8 and the trigger device, so that the improvement is simple and the implementation is convenient.

The following are two embodiments of the invention.