Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for analyzing angular motion characteristics of double-spinning projectile under aerodynamic nonlinearity

A technology of characteristic analysis and double-rotation bombs, which is applied in ammunition, ammunition testing, weapon accessories, 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: 2021-02-05
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for analyzing angular motion characteristics of double-spinning projectile under aerodynamic nonlinearity
  • Method for analyzing angular motion characteristics of double-spinning projectile under aerodynamic nonlinearity
  • Method for analyzing angular motion characteristics of double-spinning projectile under aerodynamic nonlinearity

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for analyzing angular motion characteristics of a double-spinning projectile under aerodynamic nonlinearity. The method includes the following steps: 1, establishing anonlinear angular motion equation of the double-spinning projectile about an attack angle alpha, a sideslip angle beta, a pitch angle speed omega z and a yaw angle speed omega y; 2, determining a nonlinear complex attack angle equation of the double-spinning projectile according to the nonlinear angular motion equation established in the step 1; 3, converting stability analysis of a nonlinear complex attack angle equation solution into analysis of a homogeneous equation solution corresponding to the nonlinear complex attack angle equation solution; 4, determining an amplitude plane equation of the double-spinning projectile under the action of cubic static moment; and 5, determining necessary conditions for the double-spinning projectile to generate stable conical motion under the actionof cubic static moment. Starting from aerodynamic nonlinearity, the necessary conditions that the double-spinning projectile generates stable conical swing under the action of cubic static moment areobtained, and therefore the reason why the attack angle generated by the double-spinning projectile is not attenuated and even the flight instability phenomenon occurs under the action of nonlinear static moment is pointed out.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com