Thermal/vibration characteristics of additional damping structures with entangled metallic wire material under high temperature environment

Abstract

In modern engineering practice, the simultaneous exposure to high temperatures and vibrations can threaten the security of the structure. In this paper, a novel additional damping structures with entangled metallic wire material (EMWM) are proposed and its vibration characteristics at high temperature are investigated. Firstly, a thermal/vibration coupling test platform of additional damping structures is designed and constructed, and a high-temperature vibration pickup method is adopted to extract the response signals. On this basis, the 5–400Hz frequency sweep tests are carried out under the unilateral constraint condition. The effects of excitation magnitude, ambient temperature and EMWM thickness on the vibration parameters are analyzed. The vibration performance is evaluated by modal identification and loss factor by half-power method. The results show that the damping performance of the constrained damping structure and insertion damping structure is better than that of the free damping structure under different excitation levels; the increase of the ambient temperature generates a greater influence on the vibration damping performance of the structure, but it still has a good stability; the amplitude change of the structure is more apparent through the increase of EMWM thickness, and the vibration damping performance is more superior. Under extreme engineering environments, a new approach to plate damping structures is provided that still maintains excellent performance.