CN113919064B - Parallel interstage separation safety judging method, electronic equipment and medium - Google Patents
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Abstract
The application discloses a parallel interstage separation safety judging method, electronic equipment and a medium. The method may include: establishing a reference coordinate system, and determining a reference line and two characteristic points; respectively determining the safety separation requirements in the critical time; determining a safety separation judgment criterion according to the relative overload acceleration between the two stages; determining a simplified safety criterion, and safely dividing the whole area of a relative overload acceleration coordinate system; and obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging safety through the regional landing points. According to the application, whether the separation is safe or not is judged through the initial vertical acceleration from the characteristic point to the reference line, and the safety between the parallel stages is judged by adopting a wind tunnel static force measurement experiment or numerical simulation data.
Description
Technical Field
The invention relates to the field of aerodynamic research, in particular to a parallel interstage separation safety judging method, electronic equipment and a medium.
Background
In order to reduce space transportation costs and improve transportation reliability, reusable aircraft have been the subject of significant attention and development. The two-stage approach allows the components that have completed the work task to be separated from the system and returned to the ground at the appropriate time, thereby significantly reducing propellant consumption and reducing launch costs. Under the condition of the prior art, compared with a single-stage track-in space shuttle, the track-in space shuttle is more suitable for the shuttle transportation task.
In addition to the key technology shared by hypersonic aircrafts, a special technical problem, namely interstage separation, is also provided for two-stage in-orbit aerospace aircrafts. Under supersonic or hypersonic conditions, the aerospace vehicle orbit stage is separated from the primary aircraft, the primary aircraft returns to the ground, and the orbit aircraft continues to accelerate the flight to orbit. In the separation process under the supersonic/hypersonic flight condition, a very complex flow field exists between two large aircrafts, and the flow is from a gap flow (subsonic speed/supersonic blocking flow) to a channel flow (multi-wave system supersonic flow), so that the shock wave structure is changed rapidly, and the shock wave-boundary layer is severely disturbed. These flow phenomena can produce complex aerodynamic and aerothermal effects.
Based on serious pneumatic interference between two stages, a reasonable safe separation requirement is necessary, however, the safe separation requirement is based on quantitative judgment in a time period, is unfavorable for the selection of a separation window at the initial moment, depends on a large amount of wind tunnel grid force measurement data, and has a long time period.
Therefore, it is necessary to develop a parallel interstage separation safety determination method, an electronic device, and a medium.
The information disclosed in the background section of the invention 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 the safety of parallel inter-stage separation, which can judge whether the separation is safe finally through initial vertical acceleration from a characteristic point to a reference line, and judge the safety of the parallel inter-stage by adopting a wind tunnel static force test or numerical simulation data.
In a first aspect, an embodiment of the present disclosure provides a parallel interstage separation security determination method, including:
Establishing a reference coordinate system, and determining a reference line and two characteristic points;
respectively determining the safety separation requirements in the critical time;
determining a safety separation judgment criterion according to the relative overload acceleration between the two stages;
determining a simplified safety criterion, and safely dividing the whole area of a relative overload acceleration coordinate system;
And obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging safety through the regional landing points.
Preferably, the reference frame comprises an inertial reference frame, a primary volume frame and a secondary volume frame.
Preferably, the reference line is a longitudinal axis passing through the first stage centroid.
Preferably, the safe separation requirement is that the distance between two characteristic points in the secondary coordinate system and the reference line is not smaller than the separation initial moment distance in the critical time.
Preferably, the distance from any point in the secondary volume coordinate system to the reference line is calculated by the formula (1):
d(t)＝cosθ1Δy-sinθ1Δx+sinΔθx2+cosΔθy2 (1)
Wherein d (t) is the distance from any point of the second-stage system to a reference line, delta theta is the pitch angle of the second stage relative to the first stage, theta 1 is the pitch angle of the first stage, delta x and delta y are the abscissa and the ordinate of the second-stage centroid relative to the first-stage centroid bit vector in the inertial system respectively, and x 2、y2 is the abscissa and the ordinate of the feature point on the second stage in the second-stage system.
Preferably, determining the two feature points includes:
The corresponding point with the minimum distance is taken as a characteristic point,
When delta theta is more than or equal to 0, x 2,y2 takes the minimum value, d (t) is the minimum value, and a tail characteristic point is obtained;
When delta theta is less than or equal to 0, x 2 takes the maximum value, and when y 2 takes the minimum value, d (t) takes the minimum value, so as to obtain the head characteristic point.
Preferably, the reduced safety criterion is:
Wherein, To separate the normal acceleration of the first stage under the inertial frame at the initial moment,To separate the pitch acceleration of the first stage in the inertial frame at the initial moment,To separate the normal acceleration of the second stage under the inertial frame at the initial moment,To separate the pitch acceleration of the second stage in the inertial frame at the initial moment, x 2 is the feature point abscissa in the secondary volumetric frame.
Preferably, the abscissa of the two feature points under the two-level 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 an embodiment of the present disclosure,
In a second aspect, embodiments of the present disclosure further provide an electronic device, including:
A memory storing executable instructions;
and a processor executing the executable instructions in the memory to implement the parallel inter-stage separation safety determination method.
In a third aspect, the disclosed embodiments also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the parallel inter-stage separation security determination method.
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 present invention.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIGS. 1a, 1b, and 1c illustrate inertial reference system, primary volume coordinate system, and secondary volume coordinate system, respectively, according to one embodiment of the invention.
Fig. 2 shows a schematic diagram of second level feature points and reference lines according to an embodiment of the invention.
Fig. 3 shows a flow chart of the steps of a parallel interstage separation safety determination method according to an embodiment of the invention.
Fig. 4 shows a schematic diagram of the decision area of the 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 preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
The invention provides a method for judging the 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 requirements in the critical time;
determining a safety separation judgment criterion according to the relative overload acceleration between the two stages;
determining a simplified safety criterion, and safely dividing the whole area of a relative overload acceleration coordinate system;
And obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging safety through the regional landing points.
In one example, the reference coordinate system includes an inertial reference system, a primary volume coordinate system, and a secondary volume coordinate system.
In one example, the reference line is a longitudinal axis passing through the first stage centroid.
In one example, the safe separation requirement is that the distance between two feature points in the secondary volume coordinate system and the reference line is not less than the separation initiation time distance within a critical time.
In one example, the distance from the reference line at any point in the secondary volume 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-stage system to a reference line, delta theta is the pitch angle of the second stage relative to the first stage, theta 1 is the pitch angle of the first stage, delta x and delta y are the abscissa and the ordinate of the second-stage centroid relative to the first-stage centroid bit vector in the inertial system respectively, and x 2、y2 is the abscissa and the ordinate of the feature point on the second stage in the second-stage system.
In one example, determining two feature points includes:
The corresponding point with the minimum distance is taken as a characteristic point,
When delta theta is more than or equal to 0, x 2,y2 takes the minimum value, d (t) is the minimum value, and a tail characteristic point is obtained;
When delta theta is less than or equal to 0, x 2 takes the maximum value, and when y 2 takes the minimum value, d (t) takes the minimum value, so as to obtain the head characteristic point.
In one example, the reduced security criteria are:
Wherein, To separate the normal acceleration of the first stage under the inertial frame at the initial moment,To separate the pitch acceleration of the first stage in the inertial frame at the initial moment,To separate the normal acceleration of the second stage under the inertial frame at the initial moment,To separate the pitch acceleration of the second stage in the inertial frame at the initial moment, x 2 is the feature point abscissa in the secondary volumetric frame.
In one example, the abscissa of the two feature points under the secondary system is substituted into the simplified safety criterion, and the entire 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.
FIGS. 1a, 1b, and 1c illustrate inertial reference system, primary volume coordinate system, and secondary volume coordinate system, respectively, according to one embodiment of the invention.
Specifically, an inertial reference system is established for separating initial moments, and the inertial reference 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 surface of the earth, and the origin of coordinates O is the mass center of the assembly at the initial moment of separation (which can be selected according to actual conditions); the OX axis is located at the intersection of the track plane and the horizontal plane and is oriented normal to the target. The OY axis extends upwards along the vertical line; the OZ axis is perpendicular to the other two axes and constitutes the right hand coordinate system. Since the separation process is very short, the two stages can be considered to be short-range motion, and the earth can be considered to be stationary, the 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 the first-stage centroid position; the O 'X' axis coincides with the longitudinal axis of the projectile body, and the pointing head is positive; the O 'Y' axis is positioned in the longitudinal symmetry plane of the projectile body and is vertical to the O 'X' axis, and the direction is positive; the O ' Z ' axis is perpendicular to the X ' O ' Y ' plane and the direction is determined by the right hand rule as shown in fig. 1 b.
The origin O ' of the secondary coordinate system O ' X ' Y ' Z ' is the secondary centroid position; the O 'X' axis coincides with the longitudinal axis of the projectile body, and the pointing head is positive; the O 'Y' axis is positioned in the longitudinal symmetry plane of the projectile body and is vertical to the O 'X' axis, and the direction is positive; the O "Z" axis is perpendicular to the X "O" Y "plane, and the direction is 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 an embodiment of the invention.
The coordination of the gesture and the rail in the separation process between the two stages is very important, and because of the complex aerodynamic shape between the two stages, whether collision occurs can not be simply judged by judging the distance between the centroids, firstly, the characteristic points most likely to collide should be judged, and the exploration of the distance change of the characteristic points relative to the reference line in the initial separation process has reference significance. 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 between any point M on the second stage and the reference line is shown as a formula (1), when delta theta is more than or equal to 0, x 2,y2 takes the minimum value, d (t) is the minimum value, so that the tail characteristic point 1 is found, and the tail characteristic point is the most dangerous characteristic point in practical engineering application. When Δθ is equal to or less than 0, x 2 takes a maximum value, and y 2 takes a minimum value, d (t) takes a minimum value, so that the head characteristic point 2 is found, and in actual engineering, the possibility of collision at the point is low. The reference line may be selected to pass through the longitudinal axis of the first stage 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) is more than or equal to 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: This criterion is an essential inadequacy condition to meet the requirements. Ignoring small and medium quantities, simplifying the safety criterion, wherein the simplified safety criterion is shown as formula (2), and the key parameters of the simplified criterion are as follows AndThe relative overload acceleration can be obtained from wind tunnel static data or numerical simulation results.
The vertical acceleration estimation value is adopted for judgment, namely:
Wherein a and b are the abscissa of the feature points 1 and 2 in the secondary system. By this criterion, the determination region can be marked in the coordinate axis. The region can be used for screening initial working conditions, when the initial relative overload acceleration falls in the judging region, the separation is considered to be safe, and if the separation does not fall in the region, the separation is considered to be unsafe.
The present invention also 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 judging method.
The present invention also provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the above-described parallel interstage separation security determination method.
In order to facilitate understanding of the solution and the effects of the embodiments of the present invention, three specific application examples are given below. It will be understood by those of ordinary skill in the art that the examples are for ease of understanding only and that any particular details thereof are not intended to limit the present invention in any way.
Example 1
Fig. 3 shows a flow chart of the steps of a parallel interstage separation safety determination method according to an 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 characteristic points; step 102, respectively determining safety separation requirements in critical time; step 103, determining a safety separation judgment criterion according to the relative overload acceleration between the two stages; 104, determining a simplified safety criterion, and safely dividing the whole area of a 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 safety through the regional landing points.
And establishing a reference coordinate system. Setting the initial time of parallel interstage separation, the normal acceleration of the first stage under the inertial system asPitch acceleration ofThe normal acceleration of the second stage under the inertia system isPitch acceleration ofThe four parameters can be obtained through 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.
Fig. 4 shows a schematic diagram of the decision area of the security criterion according to an embodiment of the invention.
The separation safety in a short time is evaluated by the relative overload acceleration at the initial moment, wherein,The vertical acceleration of the characteristic points relative to the reference line is utilized for discrimination, the acceleration can be correspondingly simplified, and only key relative overload acceleration items are reserved, so that the method can be used for obtaining: from the two equations, an x-shaped determination region can be obtained, as shown in fig. 4.
Fig. 4 shows four zones, where a safety assessment can be made by measurement of the initial relative overload acceleration, when the initial relative overload acceleration falls into the safety zone, the separation is considered to be safe; when the risk zone of the characteristic point 1 falls, the characteristic point 1 is easy to collide with the first stage (the tail part is easy to collide) during separation; when the risk zone of the characteristic point 2 falls, the characteristic point 2 is easy to collide with the second stage (the head is easy to collide) during separation; when the risk zone is fallen, both feature points may collide during separation, 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 judging method.
An electronic device according to an embodiment of the present disclosure includes a memory and a processor.
The memory is for storing non-transitory computer readable instructions. In particular, the memory may include one or more computer program products, which 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) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like.
The processor may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities, and may control other components in the electronic device to perform the desired functions. In one embodiment of the present disclosure, the processor is configured to execute the computer readable instructions stored in the memory.
It should be understood by those skilled in the art that, in order to solve the technical problem of how to obtain a good user experience effect, the present embodiment may also include well-known structures such as a communication bus, an interface, and the like, and these well-known structures are also included in the protection scope of the present disclosure.
The detailed description of the present embodiment may refer to the corresponding description in the foregoing embodiments, and will not be repeated herein.
Example 3
The disclosed embodiments provide 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 stored thereon non-transitory computer-readable instructions. When executed by a processor, perform all or part of the steps of the methods of embodiments of the present disclosure described above.
The computer-readable storage medium described above includes, but is not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or removable hard disk), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention has been given for the purpose of illustrating the benefits of embodiments of the invention only and is not intended to limit embodiments of the invention to any examples given.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or 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 various embodiments described.
Claims (7)
1. A parallel interstage separation safety judging 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 requirements in the critical time;
determining a safety separation judgment criterion according to the relative overload acceleration between the two stages;
determining a simplified safety criterion, and safely dividing the whole area of a relative overload acceleration coordinate system;
Obtaining two-stage relative overload acceleration according to numerical simulation calculation or wind tunnel static test, and judging safety through regional landing points;
the reference coordinate system comprises an inertial reference system, a primary body coordinate system and a secondary body coordinate system;
the safe separation requirement is that the distance between two characteristic points in a secondary body coordinate system and a reference line is not smaller than the distance between the two characteristic points and the initial separation moment in critical time;
The distance from any point in the secondary coordinate system to the reference line is calculated by the formula (1):
d(t)＝cosθ1Δy-sinθ1Δx+sinΔθx2+cosΔθy2 (1)
Wherein d (t) is the distance from any point of the second-stage system to a reference line, delta theta is the pitch angle of the second stage relative to the first stage, theta 1 is the pitch angle of the first stage, delta x and delta y are the abscissa and the ordinate of the second-stage centroid relative to the first-stage centroid bit vector in the inertial system respectively, and x 2、y2 is the abscissa and the ordinate of the feature point on the second stage in the second-stage system.
2. The parallel interstage separation safety determination method of claim 1, wherein the reference line is a longitudinal axis passing through a first stage centroid.
3. The parallel interstage separation safety determination method of claim 1, wherein determining two feature points comprises:
The corresponding point with the minimum distance is taken as a characteristic point,
When delta theta is more than or equal to 0, x 2,y2 takes the minimum value, d (t) is the minimum value, and a tail characteristic point is obtained;
When delta theta is less than or equal to 0, x 2 takes the maximum value, and when y 2 takes the minimum value, d (t) takes the minimum value, so as to obtain the head characteristic point.
4. The parallel interstage separation safety determination method of claim 1, wherein the simplified safety criterion is:
Wherein, To separate the normal acceleration of the first stage under the inertial frame at the initial moment,To separate the pitch acceleration of the first stage in the inertial frame at the initial moment,To separate the normal acceleration of the second stage under the inertial frame at the initial moment,To separate the pitch acceleration of the second stage in the inertial frame at the initial moment, x 2 is the feature point abscissa in the secondary volumetric frame.
5. The parallel interstage separation safety determination method according to claim 4, wherein an abscissa of two feature points under a two-stage system is substituted into the simplified safety criterion, and an entire area of a 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.
6. An electronic device, the electronic device comprising:
A memory storing executable instructions;
a processor executing the executable instructions in the memory to implement the parallel interstage separation security determination method of any of claims 1-5.
7. 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 safety determination method of any of claims 1-5.
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| CN112504613B (en) * | 2021-02-03 | 2021-05-28 | 中国空气动力研究与发展中心高速空气动力研究所 | Parallel aircraft interstage separation test method and device and readable storage medium |
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| CN111241634A (en) * | 2019-11-19 | 2020-06-05 | 中国空气动力研究与发展中心超高速空气动力研究所 | Analysis and forecast method for reentry of spacecraft into meteor space |
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