A method for analyzing the aerodynamic nonlinear lower-angle motion characteristics of double-rotating bombs

A technology of characteristic analysis and double-rotation bombs, which is applied to ammunition, ammunition testing, and offensive equipment, etc., can solve problems such as restricting the application of double-rotation bombs, difficult nonlinear motion phenomena, and strong nonlinear dynamics of dual-rotation bombs.

Active Publication Date: 2021-09-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003] However, the dual-rotational elastic dynamics has the characteristics of strong coupling and strong nonlinearity. At the same time, the change of structure and the introduction of control system make it difficult to analyze and explain many nonlinear motion phenomena of projectiles with the theory of linear systems.
The above nonlinear characteristics seriously restrict the application of this type of double-rotary bomb in the development of weapons and equipment

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  • A method for analyzing the aerodynamic nonlinear lower-angle motion characteristics of double-rotating bombs
  • A method for analyzing the aerodynamic nonlinear lower-angle motion characteristics of double-rotating bombs
  • A method for analyzing the aerodynamic nonlinear lower-angle motion characteristics of double-rotating bombs

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Embodiment Construction

[0066] Examples are given below to describe the present invention in detail.

[0067] This embodiment provides a method for analyzing the aerodynamic nonlinear angular motion characteristics of double-rotating bombs. Based on the quasi-linear analysis method of angular motion based on the averaging method, the necessary conditions for the stable conical oscillation of double-rotating bombs under the action of cubic static torque are obtained.

[0068] The analysis method mainly includes the following steps:

[0069] Step 1: Establish the angle of attack α, sideslip angle β, and pitch velocity ω of the double-rotating projectile z , Yaw angular velocity ω y The nonlinear angular motion equation of ;

[0070] In order to reflect the angular motion characteristics, assuming the linear velocity V of the double-rotating projectile, the rotational speed ω of the rear body x As a slow variable, select x=[αβ ω z ω y ] T is the state quantity of the nonlinear angular motion of t...

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Abstract

The invention discloses a method for analyzing the aerodynamic nonlinear lower-angle motion characteristics of a double-rotating projectile, which includes the following steps: Step 1: establishing a double-rotating projectile with respect to the angle of attack α, the sideslip angle β, and the pitch angular velocity ω z , Yaw angular velocity ω y The nonlinear angular motion equation; Step 2: Determine the nonlinear complex angle of attack equation of the double-rotating bomb according to the nonlinear angular motion equation established in step 1; Step 3: Transform the stability analysis of the solution of the nonlinear complex angle of attack equation into Analysis of its corresponding homogeneous equation solution; Step 4: Determine the amplitude plane equation of the double-rotating bomb under the action of the cubic static moment; Step 5: Determine the necessity for the double-rotating bomb to produce stable conical motion under the action of the cubic static moment Conditions; Starting from the aerodynamic nonlinearity, the necessary conditions for the stable conical oscillation of the double-rotating bomb under the action of the cubic static moment are obtained, thus pointing out that the angle of attack produced by it under the action of the nonlinear static moment does not attenuate, and even Causes of flight instability.

Description

technical field [0001] The invention relates to the technical field of analyzing the angular motion characteristics of double-rotating bombs, in particular to a method for analyzing the aerodynamic nonlinear lower angular motion characteristics of double-rotating bombs. Background technique [0002] Modern warfare has a large demand for high-precision, low-cost, over-the-horizon guided munitions with small incidental damage, which promotes the rapid development of conventional shell guidance technology. In view of the high rotational speed characteristics of the rotation-stabilized projectile, the canard assembly is used to replace the original ammunition fuze to form a "double-rotation" structure, thereby realizing the intelligent and smart transformation of the rotation-stabilized projectile. [0003] However, the double-rotational elastic dynamics has the characteristics of strong coupling and strong nonlinearity. At the same time, the change of structure and the introduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42B35/00
CPCF42B35/00
Inventor 沈元川于剑桥贾振岳陈曦
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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