A Study on the Design of Isolator and the Mounting Method for Reducing the Pyro-Shock of a MEMS IMU

• Main Authors: Han, K. (Author), Lee, H. (Author), Lee, S. (Author), Park, B. (Author), Ryu, K. (Author)
• Format: Article
• Language: English
• Published: MDPI 2022
• Subjects: % reductions; Flight vehicles; inertial measurement unit; Inertial measurements units; Integrated structure; Machine design; MEMS; MEMS (microelectromechanical system); micro electro-mechanical system; Mountings; Performance; pyro-shock; Pyro-shock; Screw connections; Vibration isolators
• Online Access: View Fulltext in Publisher

 In this paper, we proposed two methods for reducing the pyro-shock of the MEMS Inertial Measurement Unit (IMU). First, we designed the vibration isolator for reducing the pyro-shock inside the IMU. However, it turned out that there is a limit to reducing the pyro-shock with only the vibration isolator. Therefore, we improved the pyro-shock reduction performance by changing the method of mounting on the flight vehicle. Four mounting options were tested and one of them was adopted. The results showed the best reduction performance when we designed the vibration isolator with an aluminum integrated structure. When mounting, two methods were applied. One was to insert a bracket with a different material between the mounting surface and IMU and the other was to insert a set of three washers that was stacked in a PEEK-metal-PEEK order at each part of the screw connections. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.