CN112407340A - Multistage closing method for ram parafoil - Google Patents
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Abstract
The invention belongs to the technical field of aerospace returning and landing, and relates to a multistage closing method for a ram parafoil. The invention relates to a multistage closing method of a stamping parafoil, which utilizes a closing ring group and a closing rope group to be connected in series and matched to complete locking and unlocking of a closing air chamber group, and utilizes the serial unlocking relationship among all stages of closing air chamber groups to realize multistage closing and unfolding of the stamping parafoil. The multistage closing method can effectively control key design parameters such as closing area, closing stage number and the like of the ram parafoil, and the reliability of closing and unfolding is higher only by adopting a cutter with one specification.
Description
Technical Field
The invention belongs to the technical field of aerospace returning and landing, and relates to a method for realizing multistage closing of a ram parafoil.
Background
With the rapid development of aerospace technology, the reusability of spacecrafts has become a hot spot and direction of research today. Therefore, in the field of spacecraft recovery, the requirements for nondestructive landing and fixed-point landing are higher and higher. In order to meet such demand trend, the parafoil technology has been widely studied in the field of spacecraft recovery technology. The ram parachute is a parachute with gliding capability, can change the recovery of the spacecraft from the traditional uncontrolled falling into the controlled gliding falling to a preset area, and overcomes the defects of the traditional parachute that the parachute flies with the wind and the landing points are scattered greatly. Meanwhile, the ram parafoil can instantaneously reduce the speed of the spacecraft in a sparrow landing mode during landing so as to realize nondestructive landing. The excellent performance of the ram parafoil indicates that the ram parafoil has wide application prospect in the field of spacecraft recovery.
However, because the weight of a general spacecraft is large, the recovery can be realized only by using a large-sized ram parachute, the large-sized ram parachute generates a large load in the parachute opening process, and the existing parachute opening mode generates large overload on the spacecraft, so that the structure or components of the spacecraft are damaged. In addition, when the large-scale ram-type parafoil adopts single-stage closing or uncontrolled parachute opening, the problem that the inflation quantity is insufficient and the parachute cannot be formed during parachute opening can also occur, and parachute opening failure is caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method carries out multi-stage closing-in on the air chamber of the large-scale ram parafoil, thereby realizing parachute opening load control and simultaneously ensuring that the large-scale ram parafoil can be inflated and formed step by step.
The technical solution of the invention is as follows:
a ram-air parachute having a nominal deployment area of not less than 200m2The stamping parafoil is divided into a plurality of air chambers, the plurality of air chambers at two ends of the stamping parafoil are non-closing air chamber groups, the non-closing air chamber groups at two ends of the stamping parafoil are respectively named as a non-closing air chamber group A and a non-closing air chamber group B, the plurality of air chambers in the middle of the stamping parafoil are non-closing air chamber groups, the non-closing air chamber group in the middle of the stamping parafoil is named as a non-closing air chamber group C, more than one closing air chamber group is arranged between the non-closing air chamber group A and the non-closing air chamber group C, more than one closing air chamber group is arranged between the non-closing air chamber group B and the non-closing air chamber group C, and more than one non-closing air chamber is arranged between two adjacent closing air chamber groups;
the closing air chamber group of the ram parafoil is sequentially named as a first-level closing air chamber group, a second-level closing air chamber group, a third-level closing air chamber group, a fourth-level closing air chamber group and a … N-level closing air chamber group from left to right; n is the number of the closing air chamber groups of the ram parafoil and is an even number;
a closing rope group is arranged on the left side of each closing air chamber group, a closing ring group is arranged on the right side of each closing air chamber group, the closing rope groups are named and arranged from the front edge to the rear edge, namely a first closing rope is close to the front edge, a last closing rope is close to the rear edge, the closing ring groups are named and arranged from the front edge to the rear edge, namely a first closing ring is close to the front edge, and a last closing ring is close to the rear edge;
the front edge of the first-stage closing air chamber group is provided with a cutting rope and a cutter, and the cutter is triggered by an umbrella rope;
a cutting rope and a cutter are arranged at the rear edge of the second-stage mouth closing air chamber group, and the cutter is triggered by using the last mouth closing rope of the mouth closing rope group in the first-stage mouth closing air chamber group;
a cutting rope and a cutter are arranged at the front edge of the third closing air chamber group, and the cutter is triggered by using a first closing rope of the closing rope group in the second closing air chamber group;
the rear edge of the four-stage necking air chamber group is provided with a cutting rope and a cutter, and the cutter is triggered by using the last necking rope of the necking rope group in the three-stage necking air chamber group;
…；
and the rear edge of the N-level gas chamber closing group is provided with a cutting rope and a cutter, and the cutter is triggered by using the last closing rope of the closing rope group in the N-1 level gas chamber closing group.
A multi-stage closing method for a ram parafoil comprises the following steps:
(1) the last closing rope of the first-stage closing air chamber group passes through the last closing ring, and from the penultimate closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through the closing rope arranged adjacent to the closing rope arranged behind the closing rope, so that the first-stage closing air chamber group is locked; connecting a first closing rope of the first closing air chamber group with a cutter by using a cutting rope, and triggering the cutter of the first closing air chamber group by using an umbrella rope;
(2) a first closing rope of the second closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing ring, so that the second closing air chamber group is locked; connecting the last closing rope of the second-stage closing air chamber group with a cutting rope of a cutter, and triggering the cutter of the second-stage closing air chamber group by using the last closing rope of the first-stage closing air chamber group;
(3) the last closing rope of the three-stage closing air chamber group passes through the last closing ring, and from the penultimate closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through the closing rope arranged adjacent to the closing rope arranged behind the closing rope, so that the three-stage closing air chamber group is locked; connecting a first closing rope of the third closing air chamber group with a cutting rope of a cutter, and triggering the cutter of the third closing air chamber group by using the first closing rope of the second closing air chamber group;
(4) a first closing rope of the four-stage closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing rope, so that the four-stage closing air chamber group is locked; connecting the last closing rope of the fourth-stage closing air chamber group with a cutting rope for a cutter, and triggering the cutter of the fourth-stage closing air chamber group by using the last closing rope of the third-stage closing air chamber group;
….
(5) a first closing rope of the N-level closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing rope, so that the N-level closing air chamber group is locked; connecting the last closing rope of the N-level closing air chamber group with a cutter by using a cutting rope, and triggering the cutter of the N-level closing air chamber group by using the last closing rope of the N-1-level closing air chamber group;
(6) when the ram parafoil opens the parachute, the parachute cord is straightened, a cutter of the first-stage closing air chamber group is triggered, after the delay setting time, all closing air chamber groups cannot be unfolded due to the limitation of the closing cord group and the closing ring group in the delay setting time, the resistance area of the ram parafoil is small, the parachute opening load is reduced, after the delay setting time passes, the cutter of the first-stage closing air chamber group cuts off the cutting cord of the first-stage closing air chamber group, the first closing cord of the first-stage closing air chamber group is unlocked, the first closing cord of the first-stage closing air chamber group is pulled out from the first closing ring and the second closing cord by using the tension between air chambers in the first-stage closing air chamber group, the second closing cord is unlocked, the downward closing cord groups are unlocked one by one, and the unlocking of the first-stage closing air chamber group is realized; straightening when the last closing rope of the first-stage closing air chamber group is unlocked, triggering a cutter of the second-stage closing air chamber group, cutting off the cutting rope of the second-stage closing air chamber group after the time is set in a delayed mode, unlocking the last closing rope of the second-stage closing air chamber group, unlocking the second-stage closing air chamber group according to the same mode as the first-stage closing unlocking, straightening the first closing rope of the second-stage closing air chamber group to trigger the cutter of the third-stage closing air chamber group, reciprocating the cutter, finally completing unlocking of the N-stage closing air chamber group, and realizing gradual opening of the ram parafoil.
Nominal area of 150-200m2The ram parafoil adopts two-stage closing-up, and the nominal unfolding area is 201-300m2The ram parafoil adopts four-stage closing and the unfolding nominal area is 301-500m2The ram parafoil adopts six-level closing in.
Advantageous effects
(1) The multi-stage closing method of the ram parafoil can freely select closing area, closing stage number and stage-by-stage unfolding time, and effectively control parachute opening load.
(2) The invention realizes the multi-stage closing of the parafoil by adopting a series triggering mode, reduces the specification requirement on a cutter, and can complete the multi-stage closing of the ram parafoil by one or more specifications of cutters.
(3) The alternative arrangement mode of the non-closing air chambers and the closing air chambers can ensure that the ram parafoil is closed and unfolded smoothly, the phenomenon of collapse in the unfolding process can be avoided, and the reliability of multi-stage closing is improved.
(4) The multi-stage closing method of the stamping parafoil can open the canopy step by step, complete inflation of the air chamber in multiple stages, and ensure that the large parafoil can be inflated and molded.
Drawings
FIG. 1 is a schematic view of a multi-stage necking plenum distribution;
FIG. 2 is a schematic view of a bead ring apparatus;
FIG. 3 is a schematic view of a closure rope arrangement;
FIG. 4 is a schematic view of the installation of a closing rope of the first-stage closing air chamber;
FIG. 5 is a schematic view of the installation of a closing rope of a secondary closing air chamber;
FIG. 6 is a schematic view of the process of unlocking the closing air chamber.
Detailed Description
The multistage closing-in device of the ram parafoil consists of a closing-in air chamber, a closing-in rope device, a closing-in ring device, a cutter and a cutting rope. The large ram parafoil is divided into regions, and the distribution of multistage closing-in air chambers such as an unclosed air chamber, a first-stage closing-in air chamber, a second-stage closing-in air chamber, a third-stage closing-in air chamber and the like is determined, as shown in fig. 1. The closing-in ring device is arranged at the bottom of the wing rib of the closing-in air chamber, as shown in figure 2. The closing rope device is arranged at the bottom of the wing rib far away from the closing air chamber of the next stage, as shown in figure 3. The cutters of the first-stage binding-off are arranged at the front edge, the cutters of the second-stage binding-off are arranged at the rear edge, and the cutters of the third-stage binding-off are arranged at the front edge to alternately reciprocate. The cutting cord passes through the cutter and the first or last cinch cord.
When closing in installation is carried out, the first-stage closing-in air chamber is provided with closing-in ropes from the rear edge to the front edge of the ram parafoil, and the last closing-in rope passes through all closing-in rings at the same position of the last closing-in rope. From the last closing rope, the closing rope passes through the corresponding closing ring and the closing rope arranged behind the closing rope at the same time until all the closing ropes pass through the corresponding closing rings, and the first-stage closing air chamber is locked. At the front end of the primary closing-in device, the first closing-in rope is connected with the cutter by a cutting rope, as shown in fig. 4. The closing-in mode of the secondary closing-in air chamber is basically the same as that of the primary closing-in air chamber, but the difference is that a closing-in rope is arranged from the front edge to the rear edge, a cutter is arranged at the rear edge, and the cutter is triggered by the last closing-in rope of the primary closing-in, as shown in fig. 5. The closing-in mode of the third-stage closing-in air chamber is the same as that of the first-stage closing-in air chamber, but the cutter is triggered by a first closing-in rope of the second-stage closing-in. Thereby alternately reciprocating.
When the closing of the ram parafoil is released, the parachute cord triggers the primary closing-in cutter to cut off the cutting cord in a delayed manner, the first closing-in cord of the primary closing-in is unlocked and is drawn out of the closing-in ring and the second closing-in cord, the second closing-in cord is unlocked simultaneously, and accordingly the first closing-in cord and the second closing-in cord are unlocked downwards one by one until the last closing-in cord is unlocked, and the primary closing-in air chamber is unfolded. Triggering a cutter of a second-stage closing-in when a last closing-in rope of the first-stage closing-in is unlocked, cutting off the cutting rope after time delay, unlocking the last closing-in rope of the second-stage closing-in, unlocking a second-stage closing-in air chamber according to the same mode as the first-stage closing-in unlocking, and straightening the first closing-in rope to trigger the cutter of the third-stage closing-in. Thereby reciprocating as shown in fig. 6. And finally, gradually unlocking the closing-in air chambers at all levels in the test.
A method for multistage closing of a ram parafoil is used, and a closing ring and a closing rope are in series fit to complete locking and unlocking of a one-stage closing air chamber. On the basis, when the ram parafoil is closed in multiple stages, the closing rope which is finally released from closing in the closing air chamber at the upper stage is utilized to trigger the cutter of the closing air chamber at the lower stage, closing in is released after time delay, and then the cutter of the closing air chamber at the lower stage is triggered, so that the serial unlocking relation of the closing air chambers at the multiple stages is established in a reciprocating manner, and the ram parafoil is closed and unfolded in multiple stages.
The invention belongs to the technical field of aerospace returning and landing, and relates to a multistage closing method for a ram parafoil. The ram parachute is a parachute with gliding capability, can realize fixed-point nondestructive recovery of the spacecraft, and has wide application prospect in the field of spacecraft recovery in the future. For the spacecraft with large load, a large stamping parafoil is needed to realize recovery. In order to reduce the parachute opening load, the large-sized ram parafoil needs to be controlled by a multi-stage closing method during design. The invention relates to a multistage closing method of a stamping parafoil, which utilizes a closing ring and a closing rope to complete locking and unlocking of a first-stage closing air chamber in a series matching manner, and utilizes the serial unlocking relationship among closing rings of various stages to realize multistage closing and unfolding of the stamping parafoil. The multistage closing method can effectively control key design parameters such as closing area, closing stage number and the like of the ram parafoil, and the reliability of closing and unfolding is higher only by adopting a cutter with one specification.
Examples
1-6, a ram-wing umbrella having a nominal deployment area of 300m2The stamping parafoil is divided into 25 air chambers, wherein 3 air chambers at the left end of the stamping parafoil are an uncollable air chamber group A, 3 air chambers at the right end of the stamping parafoil are an uncollable air chamber group B, 3 air chambers in the middle of the stamping parafoil are an uncollable air chamber group C, and a first-level uncollable air chamber group is arranged between the uncollable air chamber group A and the uncollable air chamber group CThe second-stage mouth closing air chamber group comprises a third-stage mouth closing air chamber group and a fourth-stage mouth closing air chamber group between the non-mouth closing air chamber group B and the non-mouth closing air chamber group C, two air chambers are arranged between the first-stage mouth closing air chamber group and the second-stage mouth closing air chamber group and serve as the non-mouth closing air chamber group, and two air chambers are arranged between the third-stage mouth closing air chamber group and the fourth-stage mouth closing air chamber group and serve as the non-mouth closing air chamber group;
a closing rope group is arranged on the left side of each closing air chamber group, a closing ring group is arranged on the right side of each closing air chamber group, the closing rope groups are named and arranged from the front edge to the rear edge, namely a first closing rope is close to the front edge, a last closing rope is close to the rear edge, the closing ring groups are named and arranged from the front edge to the rear edge, namely a first closing ring is close to the front edge, and a last closing ring is close to the rear edge;
the front edge of the first-stage closing air chamber group is provided with a cutting rope and a cutter, and the cutter is triggered by an umbrella rope;
a cutting rope and a cutter are arranged at the rear edge of the second-stage mouth closing air chamber group, and the cutter is triggered by using the last mouth closing rope of the mouth closing rope group in the first-stage mouth closing air chamber group;
a cutting rope and a cutter are arranged at the front edge of the third closing air chamber group, and the cutter is triggered by using a first closing rope of the closing rope group in the second closing air chamber group;
and the rear edge of the four-stage mouth closing air chamber group is provided with a cutting rope and a cutter, and the cutter is triggered by using the last mouth closing rope of the mouth closing rope group in the three-stage mouth closing air chamber group.
A multi-stage closing method for a ram parafoil comprises the following steps:
(1) the last closing rope of the first-stage closing air chamber group passes through the last closing ring, and from the penultimate closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through the closing rope arranged adjacent to the closing rope arranged behind the closing rope, so that the first-stage closing air chamber group is locked; connecting a first closing rope of the first closing air chamber group with a cutter by using a cutting rope, and triggering the cutter of the first closing air chamber group by using an umbrella rope;
(2) a first closing rope of the second closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing ring, so that the second closing air chamber group is locked; connecting the last closing rope of the second-stage closing air chamber group with a cutting rope of a cutter, and triggering the cutter of the second-stage closing air chamber group by using the last closing rope of the first-stage closing air chamber group;
(3) the last closing rope of the three-stage closing air chamber group passes through the last closing ring, and from the penultimate closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through the closing rope arranged adjacent to the closing rope arranged behind the closing rope, so that the three-stage closing air chamber group is locked; connecting a first closing rope of the third closing air chamber group with a cutting rope of a cutter, and triggering the cutter of the third closing air chamber group by using the first closing rope of the second closing air chamber group;
(4) a first closing rope of the four-stage closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing rope, so that the four-stage closing air chamber group is locked; connecting the last closing rope of the fourth-stage closing air chamber group with a cutting rope for a cutter, and triggering the cutter of the fourth-stage closing air chamber group by using the last closing rope of the third-stage closing air chamber group;
(5) when the ram parafoil opens the parachute, the parachute cord is straightened, a cutter of the first-stage closing air chamber group is triggered, after the delay setting time, all closing air chamber groups cannot be unfolded due to the limitation of the closing cord group and the closing ring group in the delay setting time, the resistance area of the ram parafoil is small, the parachute opening load is reduced, after the delay setting time passes, the cutter of the first-stage closing air chamber group cuts off the cutting cord of the first-stage closing air chamber group, the first closing cord of the first-stage closing air chamber group is unlocked, the first closing cord of the first-stage closing air chamber group is pulled out from the first closing ring and the second closing cord by using the tension between air chambers in the first-stage closing air chamber group, the second closing cord is unlocked, the downward closing cord groups are unlocked one by one, and the unlocking of the first-stage closing air chamber group is realized; straightening when the last closing rope of the first-stage closing air chamber group is unlocked, triggering a cutter of the second-stage closing air chamber group, cutting off the cutting rope of the second-stage closing air chamber group after the time is set in a delayed mode, unlocking the last closing rope of the second-stage closing air chamber group, unlocking the second-stage closing air chamber group according to the same mode as the first-stage closing unlocking, straightening the first closing rope of the second-stage closing air chamber group to trigger the cutter of the third-stage closing air chamber group, reciprocating the cutter, finally completing unlocking of the fourth-stage closing air chamber group, and realizing gradual opening of the ram parafoil.
The invention carries out air drop test, and the test shows that the multi-stage closing method can reduce the opening load by more than 50% compared with the uncontrolled opening, and the problem that the umbrella cannot be formed due to insufficient inflation amount when the umbrella is opened does not occur.
The invention has not been described in detail in part of the common general knowledge of those skilled in the art.
Claims (6)
1. A ram parafoil, which is characterized in that: the stamping parafoil is divided into a plurality of air chambers, the plurality of air chambers at two ends of the stamping parafoil are not-closed air chamber groups, the not-closed air chamber groups at two ends of the stamping parafoil are respectively named as a not-closed air chamber group A and a not-closed air chamber group B, the plurality of air chambers in the middle of the stamping parafoil are not-closed air chamber groups, the not-closed air chamber group in the middle of the stamping parafoil is named as a not-closed air chamber group C, more than one closed air chamber group is arranged between the not-closed air chamber group A and the not-closed air chamber group C, more than one closed air chamber group is arranged between the not-closed air chamber group B and the not-closed air chamber group C, and more than one non-closed air chamber is arranged between two adjacent closed air chamber groups;
the closing air chamber group of the ram parafoil is sequentially named as a first-level closing air chamber group, a second-level closing air chamber group, a third-level closing air chamber group, a fourth-level closing air chamber group and a … N-level closing air chamber group from left to right; n is the number of the closing air chamber groups of the ram parafoil and is an even number;
a closing rope group is arranged on the left side of each closing air chamber group, a closing ring group is arranged on the right side of each closing air chamber group, the closing rope groups are named and arranged from the front edge to the rear edge in sequence, namely, the closing rope group closest to the front edge is the first closing rope, the closing rope group closest to the rear edge is the last closing rope, the closing ring groups are named and arranged from the front edge to the rear edge in sequence, namely, the closing ring group closest to the front edge is the first closing ring, and the closing ring group closest to the rear edge is the last closing ring;
the front edge of the first-stage closing air chamber group is provided with a cutting rope and a cutter, and the cutter is triggered by an umbrella rope;
a cutting rope and a cutter are arranged at the rear edge of the second-stage mouth closing air chamber group, and the cutter is triggered by using the last mouth closing rope of the mouth closing rope group in the first-stage mouth closing air chamber group;
a cutting rope and a cutter are arranged at the front edge of the third closing air chamber group, and the cutter is triggered by using a first closing rope of the closing rope group in the second closing air chamber group;
the rear edge of the four-stage necking air chamber group is provided with a cutting rope and a cutter, and the cutter is triggered by using the last necking rope of the necking rope group in the three-stage necking air chamber group;
…；
and the rear edge of the N-level gas chamber closing group is provided with a cutting rope and a cutter, and the cutter is triggered by using the last closing rope of the closing rope group in the N-1 level gas chamber closing group.
2. A ram air parachute according to claim 1, wherein: the nominal unfolding area of the ram parafoil is not less than 200m2。
3. A ram air parachute according to claim 2, wherein: nominal area of 150-200m2The ram parafoil adopts two-stage closing in.
4. A ram air parachute according to claim 2, wherein: nominal area of development 201-300m2The ram parafoil adopts four-stage closing in.
5. A ram air parachute according to claim 2, wherein: the nominal area of expansion is 301-500m2The ram parafoil adopts six-level closing in.
6. A stamping parafoil multistage closing method is characterized by comprising the following steps:
(1) the last closing rope of the first-stage closing air chamber group passes through the last closing ring, and from the penultimate closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through the closing rope arranged adjacent to the closing rope arranged behind the closing rope, so that the first-stage closing air chamber group is locked; connecting a first closing rope of the first closing air chamber group with a cutter by using a cutting rope, and triggering the cutter of the first closing air chamber group by using an umbrella rope;
(2) a first closing rope of the second closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing ring, so that the second closing air chamber group is locked; connecting the last closing rope of the second-stage closing air chamber group with a cutting rope of a cutter, and triggering the cutter of the second-stage closing air chamber group by using the last closing rope of the first-stage closing air chamber group;
(3) the last closing rope of the three-stage closing air chamber group passes through the last closing ring, and from the penultimate closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through the closing rope arranged adjacent to the closing rope arranged behind the closing rope, so that the three-stage closing air chamber group is locked; connecting a first closing rope of the third closing air chamber group with a cutting rope of a cutter, and triggering the cutter of the third closing air chamber group by using the first closing rope of the second closing air chamber group;
(4) a first closing rope of the four-stage closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing rope, so that the four-stage closing air chamber group is locked; connecting the last closing rope of the fourth-stage closing air chamber group with a cutting rope for a cutter, and triggering the cutter of the fourth-stage closing air chamber group by using the last closing rope of the third-stage closing air chamber group;
….
(5) a first closing rope of the N-level closing air chamber group passes through a first closing ring, and from a second closing rope, the closing rope passes through the corresponding closing ring and simultaneously passes through adjacent closing ropes arranged in front of the closing rope, so that the N-level closing air chamber group is locked; connecting the last closing rope of the N-level closing air chamber group with a cutter by using a cutting rope, and triggering the cutter of the N-level closing air chamber group by using the last closing rope of the N-1-level closing air chamber group;
(6) when the ram parafoil opens the parachute, the parachute cord is straightened, a cutter of the first-stage closing air chamber group is triggered, after the delay setting time, all closing air chamber groups cannot be unfolded due to the limitation of the closing cord group and the closing ring group in the delay setting time, the resistance area of the ram parafoil is small, the parachute opening load is reduced, after the delay setting time passes, the cutter of the first-stage closing air chamber group cuts off the cutting cord of the first-stage closing air chamber group, the first closing cord of the first-stage closing air chamber group is unlocked, the first closing cord of the first-stage closing air chamber group is pulled out from the first closing ring and the second closing cord by using the tension between air chambers in the first-stage closing air chamber group, the second closing cord is unlocked, the downward closing cord groups are unlocked one by one, and the unlocking of the first-stage closing air chamber group is realized; straightening when the last closing rope of the first-stage closing air chamber group is unlocked, triggering a cutter of the second-stage closing air chamber group, cutting off the cutting rope of the second-stage closing air chamber group after the time is set in a delayed mode, unlocking the last closing rope of the second-stage closing air chamber group, unlocking the second-stage closing air chamber group according to the same mode as the first-stage closing unlocking, straightening the first closing rope of the second-stage closing air chamber group to trigger the cutter of the third-stage closing air chamber group, reciprocating the cutter, finally completing unlocking of the N-stage closing air chamber group, and realizing gradual opening of the ram parafoil.
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| CN109335000A (en) * | 2018-11-16 | 2019-02-15 | 航宇救生装备有限公司 | A kind of restriction rope control open umbrella type ram air parachute |
| CN110723296A (en) * | 2019-10-29 | 2020-01-24 | 航宇救生装备有限公司 | Method for improving parachute opening reliability of large-scale stamping parafoil |
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| US5005785A (en) * | 1985-12-31 | 1991-04-09 | Para-Flite, Inc. | High drag slider reefing system for parachutes |
| JPS6474199A (en) * | 1987-09-17 | 1989-03-20 | Caterpillar Mitsubishi Ltd | Balloon para-plane |
| US4846423A (en) * | 1987-11-23 | 1989-07-11 | Pioneer Aerospace Corporation | Gliding wing parachute apparatus with staged reefing deployment means |
| CN103754390A (en) * | 2014-02-12 | 2014-04-30 | 北京空间机电研究所 | Ram air parachute and chordwise chain type closing method thereof |
| CN109335000A (en) * | 2018-11-16 | 2019-02-15 | 航宇救生装备有限公司 | A kind of restriction rope control open umbrella type ram air parachute |
| CN110723296A (en) * | 2019-10-29 | 2020-01-24 | 航宇救生装备有限公司 | Method for improving parachute opening reliability of large-scale stamping parafoil |
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