초록

Abstract ▼

1. Research Purpose
Most of metallic rotor components used in industrial and aerospace applications fail due to fatigue cracks. Because a fatigue crack grows rather rapidly once it becomes visible, it is absolutely critical to detect it as early as possible. Otherwise, undetected fatigue cracks

1. Research Purpose
Most of metallic rotor components used in industrial and aerospace applications fail due to fatigue cracks. Because a fatigue crack grows rather rapidly once it becomes visible, it is absolutely critical to detect it as early as possible. Otherwise, undetected fatigue cracks can result in catastrophic failure of entire systems and human casualties. Therefore, there is an increasing demand to develop an online monitoring system for assessing and ensuring the integrity and safety of the industrial and aerospace rotordynamic systems. When it comes to the development of the online monitoring system, there are two major changes: (1) Conventional vibration based monitoring techniques are not sensitive enough to detect a fatigue crack at its early stage without giving a proper lead time to take necessary preventive measures, and (2) It is difficulty to install sensors to continuously rotating rotor components for real-time inspection.

In this study, we propose to develop a nonlinear ultrasonic based online monitoring system so that incipient fatigue cracks (less than 100 μm in terms of crack width) can be detected using noncontact air coupled transducers. This research will contribute to advancement of the damage detection technique for industrial and aerospace rotor systems. The proposed damage detection technique will offer the following uniqueness and advantages: (1) Fully noncontact, nondestructive and nonintrusive, (2) instantaneous and automated damage diagnosis, and (3) applicable during the operational (rotating) conditions of rotordynamic systems.

목차 Contents

• COVER ... 1
• 2015 Seed Money Project Final Report ... 2
• 1. Research Purpose ... 3
• 2. Research Target Using Progress Chart ... 5
• 2.1. Target of the year ... 5
• 2.2. Long-term target ... 5
• 3. Research Method ... 6
• 4. Research Results ... 9
• 4.1. Outcome ... 9
• 4.2. Research achievements ... 11
• 4.3. Further research required ... 11
• End of Page ... 11