Structural dynamic response analysis due to the slit flow between the tailplane and the elevator

Author:

Qiu Ju1ORCID,Tang Jiali2,Sun Chundu2,Dai Fengyu3

Affiliation:

1. COMAC Shanghai Aircraft Manufacturing Co., Ltd., Composites Center, Shanghai, China; COMAC Beijing Aircraft Technology Research Institute, Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials, Beijing, China

2. COMAC Shanghai Aircraft Manufacturing Co., Ltd., Composites Center, Shanghai, China

3. DASSAULT SYSTEMES, Azia Center, Shanghai, China

Abstract

Any aircraft in flight is subjected to dynamic loads. Following vibration-related accidents, a flow field and vibration analysis can be carried out to analyze the data and study the cause of the accident. When slit airflow enters the cavity between the tailplane structure and the elevator, a mixed vortex is formed. If the vortex-induced vibrational frequency of around 50 Hz happens to be close to the natural frequency of the structure at 46 Hz, it is likely to induce structural vibration (resonance). The resonance can cause excessive fatigue damage which can ultimately lead to structural failure and the loss of the component or the aircraft. Damping methods can be employed to control vibration within the structure by reducing the amplitude of that vibrational motion by 83%. This article details a recreation of one example of structural vibration within an airborne aircraft.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Aerospace Engineering

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