Modal test method for carrier rocket

A carrier rocket and modal test technology, which is applied to the testing of machines/structural components, measuring devices, instruments, etc., can solve the problem of difficulty in ensuring connection stiffness, reducing the competitiveness of rocket products, and the structural performance of simulated arrows is not exactly the same as that of flying arrows and other issues to achieve the effect of improving accuracy and reducing interference

Active Publication Date: 2020-03-24
BEIJING LANDSPACETECH CO LTD
View PDF3 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of processing and final assembly, the structural properties of the simulated arrow and the flying arrow are not exactly the same, especially the connection stiffness is difficult to guarantee
Using simulated rockets for modal tests not only has low reliability of test results, but also increases development costs and reduces the competitiveness of rocket products

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
  • Modal test method for carrier rocket
  • Modal test method for carrier rocket
  • Modal test method for carrier rocket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Various exemplary embodiments of the present invention will now be described in detail. The detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features and embodiments of the present invention.

[0029] It will be apparent to those skilled in the art that various modifications and changes can be made in the specific embodiments of the present invention described herein without departing from the scope or spirit of the present invention. Other embodiments will be apparent to the skilled person from the description of the present invention. The specification and examples in this application are exemplary only.

[0030] When carrying out the modal test of the launch vehicle, how to correctly simulate the boundary conditions of the rocket under test is an important issue that needs to be considered. The flight state of the carried rocket is a free state. When doing a full-roc...

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 provides a modal test method for a carrier rocket, and the method comprises the steps: obtaining a first-order vibration mode of the carrier rocket in a free flight state at a zero-second moment according to a finite element model, and taking an intersection point of the first-order vibration mode of the carrier rocket and the central line of the carrier rocket as a node position; hosting the carrier rocket with the circumferential outer side, corresponding to the node position, of the carrier rocket as a hoisting point, and arranging an elastic lengthening structure between a rocket body of the carrier rocket and the hoisting wrapping belt so as to eliminate the influence of the bending rigidity of the hoisting beam on the bending rigidity of the rocket body; and obtaining modal parameters of the carrier rocket in a hoisting state. According to the modal test method provided by the invention, the influence of the rigidity of the hanging beam on rocket modal parameters can be reduced, and the reliability of a rocket modal test result is improved.

Description

technical field [0001] The invention relates to the technical field of launch vehicle tests, in particular to a modal test method for launch vehicles. Background technique [0002] For a launch vehicle with a relatively large slenderness, in order to obtain the modal parameters, the conventional method is to convert it into a beam model to obtain the modal parameters of the launch vehicle, and these modal parameters can be provided to the attitude control system for analysis . [0003] For a rigidly connected rocket body, it is difficult to guarantee the accuracy of its model and related parameters obtained through the model only through simulation. In addition, the damping parameters involved in the modal parameters can only be obtained through modal tests. [0004] When carrying out the modal test of the launch vehicle, in order to ensure the authenticity of the test results, the current conventional practice is to carry out the modal test through a simulated arrow with ...

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): G01M99/00
CPCG01M99/005
Inventor 张瑞华楠郭凤明刘建戴政
Owner BEIJING LANDSPACETECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap