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Booster reentry motion analysis method based on dynamic boundary condition

A technology of motion analysis and boundary conditions, applied in the direction of memory address/allocation/relocation, etc., can solve the problem of less system research

Inactive Publication Date: 2014-01-08
BEIHANG UNIV
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Problems solved by technology

In contrast, published literature shows that domestic systematic research in this field is less

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  • Booster reentry motion analysis method based on dynamic boundary condition
  • Booster reentry motion analysis method based on dynamic boundary condition
  • Booster reentry motion analysis method based on dynamic boundary condition

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Embodiment Construction

[0034] In order to describe the present invention more clearly, specifically provide the main steps of booster reentry motion analysis:

[0035] (1) Use modeling software to establish the geometric model of the booster, determine the spatial position of the center of mass, and calculate the pitch moment of inertia and other related parameters according to the mass distribution of the booster;

[0036] (2) Determine the size of the static and rotational calculation domains, and divide the calculation grid of the flow field outside the booster by using the meshing software;

[0037] (3) Determine the initial conditions for re-entry, such as initial altitude, initial velocity, initial pitch rate, etc., and write user programs for determining the changes in altitude, speed and pitch rate during the re-entry process of the booster;

[0038] (4) Set the solution parameters in the CFD solver, and call the user program written in (3) in real time to realize the real-time update of the...

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Abstract

The invention provides an analysis method for predicting pneumatic load and movement rules of a reentry process of a booster. According to the method, a three-dimensional unsteady flow field of the reentry process of the booster is carried out, on the basis of a multiple reference coordinate system principle and a sliding mesh technique, a dynamic boundary condition is combined, and analysis of the reentry motion of the booster is carried out. According to the Newton's laws of motion and a theorem of moment of momentum, and user programs used for calculating height, speed, pitch angle speed and other parameters of the reentry process of the booster are written. The user programs can control rotation of a rotation field to achieve pitching motions of the booster, and the physical environment in the reentry process of the booster is simulated through changes of inlet, outlet and far field boundary condition parameters of a static field. In the process that time advance is used for solving the unsteady flow field, a solver calls the user programs in real time, real-time updating of boundary conditions and the rotation speed of the rotation field is achieved, calculation is never stopped until the booster arrives at the ground, and accordingly the transient pneumatic load and the motion parameters of the booster are obtained.

Description

technical field [0001] The invention is an analysis method aiming at predicting the aerodynamic load and motion law of the reentry process of the booster. During the re-entry and landing process of the booster, the time history and space span are larger than the time and length of its motion characteristics. The external flow field and aerodynamic load of the booster change with time and attitude. The dynamic load directly affects the motion law of the booster. Therefore, accurate acquisition of the unsteady flow field and transient load in the re-entry process is the primary condition for the re-entry motion analysis of the booster. The present invention starts from solving the three-dimensional unsteady flow field of the booster, establishes a motion analysis model, and proposes Booster reentry motion analysis method. Background technique [0002] Reusable vehicles are an effective means to reduce the cost of space transportation, and it is also an inevitable trend in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/02
Inventor 李绍斌王竞超宋西镇李秋实
Owner BEIHANG UNIV
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