CN115556943A - Ejection seat parachute opening control method - Google Patents
Ejection seat parachute opening control method Download PDFInfo
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- CN115556943A CN115556943A CN202211241098.0A CN202211241098A CN115556943A CN 115556943 A CN115556943 A CN 115556943A CN 202211241098 A CN202211241098 A CN 202211241098A CN 115556943 A CN115556943 A CN 115556943A
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- ejection seat
- parachute opening
- parachute
- contour line
- ejection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D25/00—Emergency apparatus or devices, not otherwise provided for
- B64D25/08—Ejecting or escaping means
- B64D25/10—Ejector seats
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D17/00—Parachutes
- B64D17/62—Deployment
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- Aviation & Aerospace Engineering (AREA)
- Business, Economics & Management (AREA)
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Abstract
The application belongs to the field of aviation, and relates to an ejection seat parachute opening control method, which comprises the steps of establishing an off-plane coordinate system for a motion track of an ejection seat after the ejection seat is off, establishing a motion track of the ejection seat after the ejection seat is off according to the off-plane coordinate system after the ejection seat is off, then acquiring topographic contour line information of a current area by the ejection seat, the parachute opening height of the survival parachute is combined to determine the parachute opening contour line of the current area, the calculation method is simple, the parachute opening height can be adjusted in time according to different altitudes of the current area landing altitude, parachute opening time is early when the landing altitude is high, parachute opening time is late when the landing altitude is low, and accordingly the phenomenon that aerial residence time is too long due to too early parachute opening is effectively avoided.
Description
Technical Field
The application belongs to the field of aviation, and particularly relates to an ejection seat parachute opening control method.
Background
When the pilot launches the lifesaving parachute, the parachute opening heights are different due to different flight areas. The parachute opening height of the lifesaving parachute is determined according to the highest altitude point in the current ejection area, so that when the local altitude is changed drastically and the fall is large, the parachute opening time is determined according to the highest altitude, but the actual landing area of a pilot belongs to a low altitude, particularly in places such as Himalayan mountains, transection mountains and Kunlun mountains, if the pilot ejects in an plateau area, the parachute opening is too early, so that the air detention time is too long, and the risk of high altitude oxygen deficiency is caused.
Therefore, it is required to design a method capable of accurately determining the parachute opening time when the parachute opening altitude is the same as or different from the ground altitude.
Disclosure of Invention
The application aims to provide an ejection seat parachute opening control method to solve the high altitude oxygen deficiency risk caused by the large fall of parachute opening altitude and land altitude in the prior art.
The technical scheme of the application is as follows: an ejection seat parachute opening control method comprises the following steps: establishing an off-plane coordinate system according to the motion track of the ejection seat after the ejection seat is off the plane, establishing a data model according to the motion parameters of the ejection seat during ejection, and calculating the motion track of the ejection seat after the ejection seat is off the plane; acquiring topographic contour line information in the current area, and determining an umbrella opening contour line of the current area according to the umbrella opening height of a survival umbrella carried by the survival umbrella; and calculating the intersection point of the parachute opening contour line and the motion track, and acquiring the parachute opening time after the ejection seat is ejected.
Preferably, the off-plane coordinate system is established by: setting the origin of coordinates as the sea level height corresponding to the current position, determining the yaw direction z by the three coordinate axes of an off-plane coordinate system as the current aircraft course x, the ground direction y and the right-hand rule respectively, wherein the aircraft is located at the position of (0, y) 1 ，0)，y 1 Is the aircraft altitude.
Preferably, the movement locus of the ejection seat after leaving the airplane is as follows:
the course motion track of the ejection seat is as follows:
in the formula, C dx Is the coefficient of resistance of the ejection seat, s x Is the windward area of the ejection seat, m is the ejection seat mass, P is the atmospheric pressure, rho cc Is the air density;
the ground motion track is as follows: l. the y ＝v y t, wherein v y =80m/s, t is time。
Preferably, the aircraft acquires current longitude and latitude information during flying, interacts with the ground control center through the longitude and latitude information to obtain terrain contour line information of a current region, and then transmits the terrain contour line information to the ejection seat.
Preferably, the parachute opening contour line is a step function, specifically:
wherein h is 1 -h 3 Altitude, x, of different locations of the area 1 -x 5 The different distances of the heading.
According to the ejection seat parachute opening control method, the off-plane coordinate system is established according to the motion track of the ejection seat after the ejection seat leaves the plane, the motion track of the ejection seat after the ejection seat leaves the plane is established according to the off-plane coordinate system, then the ejection seat obtains terrain contour information of the current area, the parachute opening contour of the current area is determined according to the parachute opening height of the survival parachute, the calculation method is simple, the parachute opening height can be timely adjusted according to different altitudes of the current area, parachute opening time is early when landing altitudes are high, parachute opening time is late when the landing altitudes are low, and accordingly the situation that aerial detention time is too long due to the fact that parachute opening is too early is effectively prevented.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be understood that the drawings described below are merely exemplary of some embodiments of the application.
FIG. 1 is a schematic overall flow diagram of the present application;
fig. 2 is a schematic diagram of an intersection point of an ejection seat track and an umbrella opening contour line.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
An ejection seat parachute opening control method is shown in fig. 1 and comprises the following steps:
step S100, establishing an off-plane coordinate system according to a motion track of the ejection seat after the ejection seat is off, establishing a data model according to motion parameters of the ejection seat during ejection, and calculating the motion track of the ejection seat after the ejection seat is off;
as shown in FIG. 2, the three coordinate axes of the off-plane coordinate system are respectively the current aircraft heading x and the ground y, and the yaw direction z is determined by the right-hand rule, wherein the origin of the coordinates is the sea level height corresponding to the current position, and the aircraft is located at (0, y) position 1 ，0)，y 1 Is the aircraft altitude. When the ejection seat is not ejected, the ejection seat coincides with the position of the airplane, the time t =0 point is obtained, the off-plane coordinate system moves along with the airplane, when the ejection seat is ejected, the off-plane coordinate system is solidified, and the time t begins to be timed.
The motion trail after the departure has three direction vectors which are respectively heading motion x ', yawing motion z ' and ground motion y ', and when the ejection seat is ejected, the yawing motion is not dispersed, and when no roll angle exists, the yawing motion can be ignored. At the moment, only the movement track of the heading and the ground-direction movement track need to be calculated.
As a specific embodiment, the movement of the ejection seat in the ground-up direction of an airplane can be simplified into v y Linear movement of =80m/s (data relating to seat characteristics, being experimental data, and applicable only to this model of seat), the ground path of movement is l y ＝v y t。
The course motion track of the ejection seat is as follows:
in the formula, C dx To the coefficient of resistance of the ejection seat, s x The frontal area of the ejection seat, m is the mass of the ejection seat, P is the atmospheric pressure, rho ∞ Is the density of air, v ∞ Is the incoming flow velocity.
The ground motion track is as follows: l y ＝v y t, wherein, v y =80m/s, t is time.
Thus the movement track F of the ejection seat l (x, y) is a function of time t.
S200, acquiring topographic contour line information in the current area, and determining an umbrella opening contour line of the current area according to the umbrella opening height of a survival umbrella carried by the survival umbrella;
the parachute opening contour line is determined through the terrain contour line and the parachute opening height of the lifesaving parachute, the current longitude and latitude information can be collected when the airplane flies, the terrain contour line information of the current region is obtained through the interaction of the longitude and latitude information and a ground control center, then the terrain contour line information is transmitted to the ejection seat in real time, the parachute opening contour line of the current region is determined according to the parachute opening height of the survival parachute carried by the ejection seat, and the reception of the terrain contour line information of the airplane is stopped after the ejection seat is ejected.
The self movement speed v can be measured by a sensor after the ejection seat is ejected x ，v y ，v z The current air density rho can be calculated according to an aerodynamic formula together with the atmospheric pressure P ∞ And the altitude H.
And H is set as the height of the contour line of the local terrain, r is a proportional scale of the contour line, H 'is the parachute opening height of the lifesaving parachute, k is a safety coefficient, H is the contour line of the parachute opening, and H = H + r + kh'. The parachute opening height is related to the performance of the parachute, and different types of parachutes have different parachute opening heights, namely the minimum height required from parachute shooting to complete expansion of the parachute.
And in the off-plane coordinate system, the time t corresponding to the point Q where the motion trail of the ejection seat is overlapped with the parachute opening contour line is the parachute opening time.
The parachute opening contour line is a step function, and the expression is as follows:
wherein h is 1 -h 3 Altitude, x, of different locations of the area 1 -x 5 Is the course distance.
And step S300, calculating the intersection point of the parachute opening contour line and the motion track, and acquiring the parachute opening time after the ejection seat is ejected.
And F h (x，y)＝F l (x, y), solving the equation yields the time t 0 I.e. the intersection point of the contour line of the parachute opening and the movement locus of the ejection seat, t 0 Namely the time for opening the umbrella after the ejection seat is ejected. Therefore, when the ejection seat is ejected out of the cabin at time t =0, at t = t 0 The umbrella is shot at any time.
The off-plane coordinate system is established according to the motion track of the ejection seat after the ejection seat is off the plane, the motion track of the ejection seat after the ejection seat is off the plane is established according to the off-plane coordinate system after the ejection seat is off the plane, the terrain contour line information of the current area is obtained by the ejection seat, the parachute opening height of the survival parachute is combined to determine the parachute opening contour line of the current area, the calculation method is simple, the parachute opening height can be timely adjusted according to different altitudes of the current area at the ground level, the parachute opening time is earlier when the ground level is higher, the parachute opening time is later when the ground level is lower, and therefore the problem that the aerial detention time is too long due to the fact that the parachute is too early is effectively prevented.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. An ejection seat parachute opening control method is characterized by comprising the following steps:
establishing an off-plane coordinate system according to the motion track of the ejection seat after the ejection seat is off the plane, establishing a data model according to the motion parameters of the ejection seat during ejection, and calculating the motion track of the ejection seat after the ejection seat is off the plane;
acquiring topographic contour line information in the current area, and determining an umbrella opening contour line of the current area according to the umbrella opening height of a survival umbrella carried by the survival umbrella;
and calculating the intersection point of the parachute opening contour line and the motion track, and acquiring the parachute opening time after the ejection seat is ejected.
2. The ejection seat parachute opening control method of claim 1, wherein the off-plane coordinate system is established by: setting the origin of coordinates as the sea level height corresponding to the current position, determining the yaw direction z by the three coordinate axes of an off-plane coordinate system as the current aircraft course x, the ground direction y and the right-hand rule respectively, wherein the aircraft is located at the position of (0, y) 1 ，0)，y 1 Is the aircraft altitude.
3. The ejection seat parachute opening control method of claim 2, wherein the trajectory of movement of the ejection seat after departure is:
the course motion trail of the ejection seat is as follows:
in the formula, C dx Is the coefficient of resistance of the ejection seat, s x Is the windward area of the ejection seat, m is the ejection seat mass, P is the atmospheric pressure, rho ∞ Is the density of air, v ∞ Is the incoming flow velocity;
the ground motion track is as follows: l. the y ＝v y t, wherein v y =80m/s, t is time.
4. The ejection seat parachute opening control method of claim 1, wherein: the method comprises the steps that current longitude and latitude information is collected when an airplane flies, terrain contour line information of a current region is obtained through interaction of the longitude and latitude information and a ground control center, and then the terrain contour line information is transmitted to an ejection seat.
5. The ejection seat parachute opening control method of claim 1, wherein the parachute opening contour is a step function, specifically:
wherein h is 1 -h 3 Altitude, x, of different locations of the area 1 -x 5 Is the heading distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211241098.0A CN115556943A (en) | 2022-10-11 | 2022-10-11 | Ejection seat parachute opening control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211241098.0A CN115556943A (en) | 2022-10-11 | 2022-10-11 | Ejection seat parachute opening control method |
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| CN115556943A true CN115556943A (en) | 2023-01-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104417759A (en) * | 2013-08-28 | 2015-03-18 | 无锡慧思顿科技有限公司 | Multi-parameter multi-sensor intelligent parachute |
| CN106314804A (en) * | 2016-08-31 | 2017-01-11 | 航宇救生装备有限公司 | Method for precisely controlling time delay of parachute opening device based on different temperatures |
| CN110803290A (en) * | 2019-12-12 | 2020-02-18 | 沈阳航空航天大学 | A Novel Ejection Seat Program Control Method |
| US20210354833A1 (en) * | 2018-12-26 | 2021-11-18 | Rakuten Group, lnc. | Unmanned flight equipment, alarm device, aerial vehicle, and alarm device release apparatus |
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- 2022-10-11 CN CN202211241098.0A patent/CN115556943A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104417759A (en) * | 2013-08-28 | 2015-03-18 | 无锡慧思顿科技有限公司 | Multi-parameter multi-sensor intelligent parachute |
| CN106314804A (en) * | 2016-08-31 | 2017-01-11 | 航宇救生装备有限公司 | Method for precisely controlling time delay of parachute opening device based on different temperatures |
| US20210354833A1 (en) * | 2018-12-26 | 2021-11-18 | Rakuten Group, lnc. | Unmanned flight equipment, alarm device, aerial vehicle, and alarm device release apparatus |
| CN110803290A (en) * | 2019-12-12 | 2020-02-18 | 沈阳航空航天大学 | A Novel Ejection Seat Program Control Method |
Non-Patent Citations (1)
| Title |
|---|
| 董伟;: "弹射座椅开伞程序的方案分析", 产业与科技论坛, no. 23, 15 December 2015 (2015-12-15), pages 52 - 53 * |
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