A Fast Prediction Method for Time-Varying Modal Parameters of Missile and Rocket Based on Finite Element Method

YU Lei; MA Qinghua; WANG Zhiyi; LI Zeyang

doi:10.15892/j.cnki.djzdxb.2025.06.001

Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 6: 971 - 977

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.06.001

Academic article

A Fast Prediction Method for Time-Varying Modal Parameters of Missile and Rocket Based on Finite Element Method

YU Lei ^,¹^,² ,
MA Qinghua ¹^,² ,
WANG Zhiyi ¹^,² ,
LI Zeyang ¹^,²

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¹ National Key Laboratory of Land and Air Based Information Perception and Control,Xi’an 710065, Shaanxi, China
² Xi’an Modern Control Technology Research Institute,Xi’an 710065, Shaanxi, China

Received date: 2024-06-13

Online published: 2026-01-24

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Abstract

The modal parameters of large-scale missile and rocket systems are generally obtained through finite element analysis and ground vibration tests.Due to the inability to simulate the time-varying characteristics of the system under flight conditions,it is usually necessary to conduct finite element modeling or ground vibration tests based on several characteristic conditions,and finally obtain the flight modal frequency through numerical interpolation.The repeated modeling and ground testing process is time-consuming and laborious.This article presents a fast prediction method for time-varying modal parameters of missile and rocket,which is based on the concentrated mass beam model and finite element method.This method introduces time-varying mass matrix,stiffness matrix,and damping matrix to describe the time-varying system,which can quickly provide the time-varying modal frequency parameters of the system.This method has been validated through ground vibration test and flight test,the results show that this method can reliably simulate the time-varying modal parameters of the system,effectively solving the pain points of the tedious simulation of time-varying systems.Moreover,the time-varying dynamic response data obtained based on this method can be used for dynamic inverse problems such as the modal consistency analysis and load identification.

Key words： guided rocket; modal analysis; finite element method; time-varying system

Cite this article

YU Lei , MA Qinghua , WANG Zhiyi , LI Zeyang . A Fast Prediction Method for Time-Varying Modal Parameters of Missile and Rocket Based on Finite Element Method[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(6) : 971 -977 . DOI: 10.15892/j.cnki.djzdxb.2025.06.001

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