Dynamic Analysis of an Aeroengine Temperature Detector System based on a Lumped Parameter Model

Abstract

Addressing the issue of dynamic response amplification in the aeroengine temperature detector system under high-temperature and vibrational environments, a 12-degree-of-freedom lumped parameter dynamic model consisting of the detector body, connecting tube, thermosensitive component, and bracket was established to analyze the inherent characteristics and vibration response of the system. The results indicate that the low-order modes of the system primarily manifest as overall torsional, translational, and locally coupled vibrations. The thermosensitive component exhibits significant responses in both lateral and rotational directions, with the main risk frequency bands of the system concentrated around 400~500 Hz and 844 Hz. Further analysis reveals that the dynamic stress at the root weld of the thermosensitive component is relatively high, making it a potential weak spot in the system. The research findings can provide a reference for the dynamic analysis and reliability design of aeroengine temperature detector systems.