Quantitative Analysis Method for Effect of Extreme Temperature on Hit Accuracy of PGMs

LIU Zhaofeng; QI Ziyuan; CUI Kaibo; LI Xiang

doi:10.7643/ issn.1672-9242.2025.09.012

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (9) : 105-114. DOI: 10.7643/ issn.1672-9242.2025.09.012

Weapons Equipment

Quantitative Analysis Method for Effect of Extreme Temperature on Hit Accuracy of PGMs

LIU Zhaofeng¹, QI Ziyuan^1,*, CUI Kaibo¹, LI Xiang²

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Abstract

The work aims to establish a method for quantifying the impact of extreme temperature on the hit accuracy of precision-guided munitions (PGMs) throughout their life cycle. A multi-physics coupled finite element analysis (FEA) model encompassing the missile body structure, seeker optical window, and inertial measurement unit (IMU) was established. By simulating various thermal loads, including high/low-temperature storage and dynamic aerodynamic heating and internal heat sources during the flight profile, the transient temperature fields and thermal deformations of critical components were analyzed. The study focused on the deformation patterns of accuracy-sensitive parts like the optical window and IMU mounting base, establishing a quantitative mapping model between component deformation and seeker pointing error. The analysis revealed that under +60 ℃ and -40 ℃ initial conditions, the thermally induced pointing error at the end of flight was significant, causing the hit accuracy (CEP) to degrade by approximately 40% (to 7.03 m) and 27% (to 6.38 m) respectively, compared with the room-temperature baseline (5.02 m). The proposed quantitative assessment method achieves a systematic analysis from the external environment through internal deformation to final operational effectiveness. Compared with steady-state analysis, dynamic thermal load analysis considering the flight profile more accurately reveals the impact of thermal effects on combat capability. This methodology provides a robust theoretical basis and technical support for the environmental adaptability design, operational envelope determination, and performance evaluation of PGMs.

Key words

precision-guided munitions / extreme temperature / finite element analysis / multi-physics field coupling / hit accuracy / quantitative analysis

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LIU Zhaofeng, QI Ziyuan, CUI Kaibo, LI Xiang. Quantitative Analysis Method for Effect of Extreme Temperature on Hit Accuracy of PGMs[J]. Equipment Environmental Engineering. 2025, 22(9): 105-114 https://doi.org/10.7643/ issn.1672-9242.2025.09.012

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