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Method for optimizing reconstruction model of disturbing gravity along gliding trajectory

A technology for reconstructing models and disturbing gravity, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as large data storage, large calculation scale, and long calculation time

Active Publication Date: 2017-03-29
GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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  • Description
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Problems solved by technology

Existing disturbance gravity calculation methods usually have the characteristics of large calculation scale, large data storage capacity, and long calculation time, which cannot meet the requirements of light weight and calculation efficiency for real-time calculation on the projectile.

Method used

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  • Method for optimizing reconstruction model of disturbing gravity along gliding trajectory
  • Method for optimizing reconstruction model of disturbing gravity along gliding trajectory
  • Method for optimizing reconstruction model of disturbing gravity along gliding trajectory

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Embodiment Construction

[0147] Below in conjunction with specific example, the present invention will be further described:

[0148] Simulation based on the CAV-H aircraft model, the basic simulation conditions are set as follows: ① mass m = 908kg, reference area Sm = 0.48375m 2 ;② State parameter of re-entry point: speed V I =6500m / , s velocity inclination angle θ I = 0°, height H I =80km; ③Terminal state parameter of gliding section: speed V k =2500m / s, velocity inclination θ k = 0°, height H k =30km, the terminal track yaw angle deviation is not more than ±5°; ④ Flight constraints: maximum heat flux density Maximum dynamic pressure q max =100kPa, maximum overload n max =3g; ⑤ The waiting distance from the target point at the end of the terminal: S togo = 100 km.

[0149] The simulation computer configuration is: Intel(R) Core(TM) i5-3470CPU@3.20GHz, memory 3.46GB. The software environment is Windows XP operating system, and the calculation program is developed based on VC++6.0.

[0150...

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Abstract

The invention discloses a method for optimizing a reconstruction model of disturbing gravity along a gliding trajectory. The method comprises the following steps of firstly, computing a three-dimensional envelop of a trajectory of a pole changing coordinate system; secondly, dividing the whole airspace of the pole changing coordinate system; thirdly, establishing a whole reconstruction model of the disturbing gravity of a general coordinate system; fourthly, establishing a local reconstruction model of the disturbing gravity along the trajectory; fifthly, establishing a fast approximation algorithm of the disturbing gravity in a flight process based on this; sixthly, carrying out experiment design and constructing an agent model of the reconstruction model; and lastly, establishing an optimization method for the agent model. According to the method for optimizing the reconstruction model of the disturbing gravity along the gliding trajectory, a minimal storage capacity model under the given accuracy requirement and a highest accuracy model under the given memory space requirement can be obtained, the requirements of onboard real-time computation for data storage capacity, the computation speed and the reconstruction accuracy can be met, and the method has better prospect in engineering application.

Description

technical field [0001] The invention belongs to the field of aircraft dynamics modeling, in particular to a method for optimizing a model of disturbance gravity reconstruction along a gliding trajectory. Background technique [0002] The gliding trajectory involved in the present invention specifically refers to the trajectory of a hypersonic gliding aircraft including the trajectory of the initial descent segment and the trajectory of the glide segment, where the starting point is the re-entry point and the end point is the transition point at the end of the glide segment. The gliding trajectory is in the adjacent space for a long time, and is significantly affected by the gravitational force of the earth's disturbance. The calculation shows that the position deviation of the terminal position of the gliding trajectory caused by the disturbance of gravity can reach tens of kilometers, so it is necessary to consider the influence of the disturbance of gravity in the trajecto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/20
Inventor 周欢丁智坚葛任伟黄维国周林
Owner GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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