CN113919064A - Parallel interstage separation safety determination method, electronic device, and medium - Google Patents
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Abstract
The application discloses a parallel interstage separation safety determination method, electronic equipment and a medium. The method can comprise the following steps: establishing a reference coordinate system, and determining a reference line and two characteristic points; respectively determining the safety separation requirement in the critical time; determining a judgment criterion of safety separation according to the relative overload acceleration between two stages; determining a simplified safety criterion, and safely dividing the whole area of the relative overload acceleration coordinate system; and obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging the safety through the region falling point. The method judges whether the separation is safe finally through the initial vertical acceleration from the characteristic point to the reference line, and judges the safety of the parallel stages by adopting a wind tunnel static force measurement experiment or numerical simulation data.
Description
Technical Field
The present invention relates to the field of aerodynamic research, and more particularly, to a parallel interstage separation safety determination method, an electronic device, and a medium.
Background
In order to reduce space transportation costs and increase transportation reliability, reusable aircraft have become an object of significant concern and development. The two-stage approach allows the work-tasked components to be separated from the system and returned to the surface at the appropriate time, thereby significantly reducing propellant consumption and reducing launch costs. Compared with a single-stage in-orbit aerospace plane, the air-craft aircraft is more suitable for the round-trip transportation task from the sky to the earth under the condition of the prior art.
The two-stage in-orbit aerospace craft has a special technical problem of interstage separation besides the common key technology of hypersonic craft. Under the condition of supersonic speed or hypersonic speed, the aerospace vehicle orbit level is separated from the first-level vehicle, the first-level vehicle returns to the ground, and the orbit vehicle continues to fly and enter the orbit in an accelerating way. In the separation process under the supersonic/hypersonic flight condition, a very complex flow field exists between the two large aircrafts, the flow is from slit flow (subsonic/supersonic obstruction flow) to channel flow (multi-wave system supersonic flow), the shock wave structure is changed rapidly, and the shock wave-boundary layer is interfered seriously. These flow phenomena can create complex aerodynamic and aerothermal effects.
Based on severe pneumatic interference between two stages, it is necessary to provide reasonable safety separation requirements, however, the safety separation requirements are based on quantitative judgment in a time period, which is not beneficial to selection of a separation window at an initial moment, and the time period is long depending on a large amount of wind tunnel grid force measurement data.
Therefore, it is necessary to develop a parallel interstage separation safety determination method, an electronic device, and a medium.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a method, electronic equipment and medium for judging safety of parallel interstage separation, which can judge whether separation is safe finally through initial vertical acceleration from a characteristic point to a reference line, and judge safety of parallel interstage separation by adopting a wind tunnel static force test or numerical simulation data.
In a first aspect, an embodiment of the present disclosure provides a method for determining safety of parallel interstage separations, including:
establishing a reference coordinate system, and determining a reference line and two characteristic points;
respectively determining the safety separation requirement in the critical time;
determining a judgment criterion of safety separation according to the relative overload acceleration between two stages;
determining a simplified safety criterion, and safely dividing the whole area of the relative overload acceleration coordinate system;
and obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging the safety through the region falling point.
Preferably, the reference coordinate system comprises an inertial reference system, a primary body coordinate system and a secondary body coordinate system.
Preferably, the reference line is the longitudinal axis of the first order centroid.
Preferably, the safe separation requirement is that the distance between two characteristic points in the secondary body coordinate system and the reference line is not less than the distance at the initial separation moment in the critical time.
Preferably, the distance from any point in the secondary body coordinate system to the reference line is calculated by formula (1):
d(t)＝cosθ1Δy-sinθ1Δx+sinΔθx2+cosΔθy2 (1)
wherein d (t) is the distance from any point of the second-level system to the reference line, Delta theta is the pitch angle of the second level relative to the first level, theta1For the primary pitch angle, the delta x and the delta y are respectively the abscissa and the ordinate of the secondary mass center relative to the primary mass center position vector under the inertial system, and x2、y2The abscissa and ordinate of the feature point on the second level under the second level system.
Preferably, determining two feature points comprises:
the corresponding point with the distance as the minimum value is taken as a characteristic point,
when Delta theta is not less than 0, x2，y2When the minimum value is taken, d (t) is the minimum value, and tail characteristic points are obtained;
when Delta theta is less than or equal to 0, x2Taking the maximum value, y2And when the minimum value is taken, d (t) is the minimum value, and the head characteristic point is obtained.
Preferably, the reduced security criteria are:
wherein the content of the first and second substances,
in order to separate the normal acceleration of the first stage under the inertial system at the initial moment,
to decouple the pitch acceleration of the first stage at the initial moment under the inertial system,
to decouple the normal acceleration of the second stage in the inertial system at the initial moment,
for separating the pitch angular acceleration, x, of the second stage at the initial moment in the inertial system2Is the abscissa of the characteristic point in the secondary body coordinate system.
Preferably, the abscissa of the two feature points under the secondary system is substituted into the simplified safety criterion, and the whole area of the relative overload acceleration coordinate system is divided into a safety area, a tail feature point risk area, a head feature point risk area and a risk area.
As a specific implementation of the embodiments of the present disclosure,
in a second aspect, an embodiment of the present disclosure further provides an electronic device, including:
a memory storing executable instructions;
a processor executing the executable instructions in the memory to implement the parallel interstage separation security decision method.
In a third aspect, the disclosed embodiments also provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for determining the security of the parallel interstage separations is implemented.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1a, 1b, and 1c respectively show an inertial reference frame, a primary body coordinate system, and a secondary body coordinate system according to an embodiment of the invention.
FIG. 2 shows a schematic diagram of second-level feature points and reference lines according to one embodiment of the invention.
Figure 3 illustrates a flow diagram of the steps of a parallel interstage separation security determination method according to one embodiment of the invention.
Fig. 4 shows a schematic diagram of a decision region of a security criterion according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
The invention provides a method for judging safety of parallel interstage separation, which comprises the following steps:
establishing a reference coordinate system, and determining a reference line and two characteristic points;
respectively determining the safety separation requirement in the critical time;
determining a judgment criterion of safety separation according to the relative overload acceleration between two stages;
determining a simplified safety criterion, and safely dividing the whole area of the relative overload acceleration coordinate system;
and obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging the safety through the region falling point.
In one example, the reference coordinate system includes an inertial reference system, a primary body coordinate system, and a secondary body coordinate system.
In one example, the reference line is a longitudinal axis of the first order centroid.
In one example, the safe separation requirement is that the distance between two feature points in the two-level body coordinate system and the reference line is not less than the separation initial moment distance in the critical time.
In one example, the distance from a reference line at any point in the secondary body coordinate system is calculated by equation (1):
d(t)＝cosθ1Δy-sinθ1Δx+sinΔθx2+cosΔθy2 (1)
wherein d (t) is the distance from any point of the second-level system to the reference line, Delta theta is the pitch angle of the second level relative to the first level, theta1For the primary pitch angle, the delta x and the delta y are respectively the abscissa and the ordinate of the secondary mass center relative to the primary mass center position vector under the inertial system, and x2、y2The abscissa and ordinate of the feature point on the second level under the second level system.
In one example, determining two feature points includes:
the corresponding point with the distance as the minimum value is taken as a characteristic point,
when Delta theta is not less than 0, x2，y2When the minimum value is taken, d (t) is the minimum value, and tail characteristic points are obtained;
when Delta theta is less than or equal to 0, x2Taking the maximum value, y2And when the minimum value is taken, d (t) is the minimum value, and the head characteristic point is obtained.
In one example, the simplified security criteria are:
wherein the content of the first and second substances,
in order to separate the normal acceleration of the first stage under the inertial system at the initial moment,
to decouple the pitch acceleration of the first stage at the initial moment under the inertial system,
to decouple the normal acceleration of the second stage in the inertial system at the initial moment,
for separating the pitch angular acceleration, x, of the second stage at the initial moment in the inertial system2Is the abscissa of the characteristic point in the secondary body coordinate system.
In one example, the abscissa of two feature points under the secondary system is substituted into the simplified safety criterion, and the whole area of the relative overload acceleration coordinate system is divided into a safety zone, a tail feature point risk zone, a head feature point risk zone and a risk zone.
Fig. 1a, 1b, and 1c respectively show an inertial reference frame, a primary body coordinate system, and a secondary body coordinate system according to an embodiment of the invention.
Specifically, an inertial reference system at the initial moment of separation is established, and the coordinate system is mainly used for describing two-stage kinematic parameters, displacement, speed, acceleration, attitude angle, attitude angular speed, attitude angular acceleration and the like.
The inertial coordinate system OXYZ is a coordinate system fixedly connected with the earth surface, and the origin of coordinates O is the centroid (which can be selected according to actual conditions) of the assembly at the initial separation moment; the OX axis is positioned at the intersection line of the orbital plane and the horizontal plane, and the pointing target is positive. The OY axis extends upward along the vertical line; the OZ axis is perpendicular to the other two axes and constitutes a right-hand coordinate system. Since the separation process is very short, two stages can be considered to be short range motion in a short time, and the earth can be considered stationary, the above mentioned coordinate system can be considered to be an inertial system, as shown in fig. 1 a.
The origin O ' of the primary body coordinate system O ' X ' Y ' Z ' is a first-stage centroid position; the axis O 'X' is coincident with the longitudinal axis of the projectile body, and the pointing head is positive; the axis O 'Y' is positioned in the longitudinal symmetrical plane of the projectile body and is vertical to the axis O 'X', and the pointing direction is positive; the O ' Z ' axis is perpendicular to the X ' O ' Y ' plane, the orientation being determined by the right hand rule, as shown in FIG. 1 b.
The origin O ' of the secondary body coordinate system O ' X ' Y ' Z ' is the second-stage centroid position; the axis O 'X' coincides with the longitudinal axis of the projectile body, and the pointing head is positive; the axis O 'Y' is positioned in the longitudinal symmetrical plane of the projectile body and is vertical to the axis O 'X', and the pointing direction is positive; the O "Z" axis is perpendicular to the X "O" Y "plane, the orientation being determined by the right hand rule, as shown in FIG. 1 c.
FIG. 2 shows a schematic diagram of second-level feature points and reference lines according to one embodiment of the invention.
Attitude and orbit coordination between two stages in the separation process is very important, and due to the complex aerodynamic shape between two stages, whether collision occurs or not can not be judged simply by judging the distance between the centroids, firstly, the most probable collision characteristic point is judged, and the change of the distance of the characteristic point relative to a reference line in the initial separation process is researched, so that the reference significance is achieved. When the distance between the feature point and the reference line is reduced, if the distance between the secondary bottom surface and the primary top surface is small, there is a possibility of collision, as shown in fig. 2.
The vertical distance of any point M on the second level relative to the reference line is shown as a formula (1), and x is judged by the formula when delta theta is larger than or equal to 02，y2When taking the minimum value, d (t) is the minimum value, so the tail feature point 1 is found, which is also the most dangerous feature point in practical engineering application. When delta theta is less than or equal toAt 0, x2Taking the maximum value, y2When the minimum value is taken, d (t) is the minimum value, and therefore, the head feature point 2 is found, and the collision probability is not high in the actual engineering. The reference line may be selected to be the longitudinal axis of the first order centroid.
The vertical acceleration of any point M on the second level with respect to the reference line is:
the safety separation requirements are as follows: d (t) -d (t)0)≥0。
Assuming that the separation result depends on the relative overload acceleration between the two stages at the initial moment of separation, the safety criterion based on the safety separation requirement is:
the criterion is a necessary insufficiency condition to meet the requirements. Neglecting small and medium quantities, simplifying the safety criterion, wherein the simplified safety criterion is a formula (2), and the key parameter of the simplified safety criterion is
And
the relative overload acceleration can be obtained from wind tunnel static data or numerical simulation results.
The vertical acceleration estimated value is adopted for judgment, namely:
wherein a and b are abscissas of the characteristic points 1 and 2 under a secondary system. By this criterion, the decision region can be marked in the coordinate axis. The region can be used for screening of initial working conditions, when the initial relative overload acceleration falls in the judgment region, the separation is considered to be safe, and if the initial relative overload acceleration does not fall in the judgment region, the separation is not considered to be safe.
The present invention also provides an electronic device, comprising: a memory storing executable instructions; and the processor executes executable instructions in the memory to realize the parallel interstage separation safety judgment method.
The present invention also provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the parallel interstage separation security determination method described above.
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, three specific application examples are given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
Example 1
Figure 3 illustrates a flow diagram of the steps of a parallel interstage separation security determination method according to one embodiment of the invention.
As shown in fig. 3, the parallel interstage separation safety determination method includes: step 101, establishing a reference coordinate system, and determining a reference line and two feature points; step 102, respectively determining the safety separation requirement in the critical time; 103, determining a judgment criterion of safety separation according to the relative overload acceleration between two stages; 104, determining a simplified safety criterion, and safely dividing the whole area of the relative overload acceleration coordinate system; and 105, obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging the safety through an area drop point.
A reference coordinate system is established. The normal acceleration of the first stage under the inertial system is set as
Acceleration of pitch angle of
The second stage has a normal acceleration in the inertial system of
Acceleration of pitch angle of
The four parameters can be obtained by wind tunnel static force measurement or numerical simulation, and it is noted that the four parameters need to be measured under the interference of the combination body.
Fig. 4 shows a schematic diagram of a decision region of a security criterion according to an embodiment of the invention.
The separation safety is evaluated in a short time by the relative overload acceleration at the initial moment, wherein,
the vertical acceleration of the characteristic point relative to the reference line is used for judging, the acceleration can be correspondingly simplified, only a key relative overload acceleration item is reserved, and the following can be obtained:
an x-shaped decision region can be obtained from both equations, as shown in fig. 4.
FIG. 4 shows four regions where a security assessment can be made by measurement of relative overload acceleration at an initial time, and where separation is considered safe when the initial relative overload acceleration falls within a safe zone; when the feature point 1 falls into the risk region of the feature point 1, the feature point 1 is easy to collide with the first stage (the tail part is easy to collide) during separation; when the feature point 2 falls into the risk region of the feature point 2, the feature point 2 is easy to collide with the second stage (the head is easy to collide) during separation; when falling into the risk zone, then both feature points may collide when separating, and the separation window is selected to avoid the zone.
Example 2
The present disclosure provides an electronic device including: a memory storing executable instructions; and the processor runs executable instructions in the memory to realize the parallel interstage separation safety judgment method.
An electronic device according to an embodiment of the present disclosure includes a memory and a processor.
The memory is to store non-transitory computer readable instructions. In particular, the memory may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc.
The processor may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of the disclosure, the processor is configured to execute the computer readable instructions stored in the memory.
Those skilled in the art should understand that, in order to solve the technical problem of how to obtain a good user experience, the present embodiment may also include well-known structures such as a communication bus, an interface, and the like, and these well-known structures should also be included in the protection scope of the present disclosure.
For the detailed description of the present embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, which are not repeated herein.
Example 3
The embodiment of the present disclosure provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the parallel interstage separation security determination method.
A computer-readable storage medium according to an embodiment of the present disclosure has non-transitory computer-readable instructions stored thereon. The non-transitory computer readable instructions, when executed by a processor, perform all or a portion of the steps of the methods of the embodiments of the disclosure previously described.
The computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROMs and DVDs), magneto-optical storage media (e.g., MOs), magnetic storage media (e.g., magnetic tapes or removable disks), media with built-in rewritable non-volatile memory (e.g., memory cards), and media with built-in ROMs (e.g., ROM cartridges).
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A parallel interstage separation safety determination method is characterized by comprising the following steps:
establishing a reference coordinate system, and determining a reference line and two characteristic points;
respectively determining the safety separation requirement in the critical time;
determining a judgment criterion of safety separation according to the relative overload acceleration between two stages;
determining a simplified safety criterion, and safely dividing the whole area of the relative overload acceleration coordinate system;
and obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging the safety through the region falling point.
2. The parallel interstage separation safety determination method according to claim 1, wherein the reference coordinate system comprises an inertial reference system, a primary body coordinate system and a secondary body coordinate system.
3. The parallel interstage separation safety method of claim 1, wherein the reference line is a longitudinal axis of a first stage centroid.
4. The parallel interstage separation safety determination method according to claim 2, wherein the safety separation requirement is that the distance between two feature points in the secondary body coordinate system from the reference line is not less than the separation initial time distance in the critical time.
5. The parallel interstage separation safety determination method according to claim 1, wherein a distance from a reference line at any point in the secondary body coordinate system is calculated by formula (1):
d(t)＝cosθ1Δy-sinθ1Δx+sinΔθx2+cosΔθy2 (1)
wherein d (t) is the distance from any point of the second-level system to the reference line, Delta theta is the pitch angle of the second level relative to the first level, theta1For the primary pitch angle, the delta x and the delta y are respectively the abscissa and the ordinate of the secondary mass center relative to the primary mass center position vector under the inertial system, and x2、y2The abscissa and ordinate of the feature point on the second level under the second level system.
6. The parallel interstage separation safety determination method of claim 5, wherein determining two feature points comprises:
the corresponding point with the distance as the minimum value is taken as a characteristic point,
when Delta theta is not less than 0, x2，y2When the minimum value is taken, d (t) is the minimum value, and tail characteristic points are obtained;
when Delta theta is less than or equal to 0, x2Taking the maximum value, y2And when the minimum value is taken, d (t) is the minimum value, and the head characteristic point is obtained.
7. The parallel interstage separation safety decision method of claim 1, wherein said simplified safety criterion is:
wherein the content of the first and second substances,
in order to separate the normal acceleration of the first stage under the inertial system at the initial moment,
to decouple the pitch acceleration of the first stage at the initial moment under the inertial system,
to decouple the normal acceleration of the second stage in the inertial system at the initial moment,
for separating the pitch angular acceleration, x, of the second stage at the initial moment in the inertial system2Is the abscissa of the characteristic point in the secondary body coordinate system.
8. The parallel interstage separation safety determination method according to claim 7, wherein the abscissa of two feature points under a secondary system is substituted into the simplified safety criterion, and the whole area of a relative overload acceleration coordinate system is divided into a safety zone, a tail feature point risk zone, a head feature point risk zone, and a risk zone.
9. An electronic device, characterized in that the electronic device comprises:
a memory storing executable instructions;
a processor executing the executable instructions in the memory to implement the parallel interstage separation security decision method of any one of claims 1-8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the parallel interstage separation security determination method of any one of claims 1 to 8.
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