Implementation of dampers to reduce fatigue loading in 3D lattice structures

• Main Author: Chan, Zi Shan
• Other Authors: Moon Seung Ki
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering; Physics; Damper; Vibration; Attenuation; Frequency
• Online Access: https://hdl.handle.net/10356/176944
• Institution: Nanyang Technological University

With the increasing implementation of 3D lattice structures within various fields of engineering around the world. However, fatigue failure due to dynamic loads is ever present and can be catastrophic to such structures. As such, vibration attenuation needs to be considered for such structures to withstand dynamic loads. Hence, this project aims to explore the capabilities of external damping implementations upon Lattice Structures (3D Kagome) and to propose a damper design suitable for general lattice structures through the analysis of elastomer, spring and pneumatic, mount types. The research utilises the framework of: (1) Select Lattice Structure to study, (2) Select and compare damper mounting types, (3) Create Proposed Design, (4) Exploration of Design via Simulation, which will take place before the eventual production of the part. An experiment is conducted on the damper materials using a 90mm by 90mm by 30mm PLA structure to determine the frequencies of damped and undamped, before using the Transmissibility equation to find the lowest ratio. It showed that Spring followed by Elastomers, had the lowest transmissibility. Then, a prototype is generated, and the design is tested in a simulation. From there, transmissibility of the final design was calculated and is proven to be lower than the others, making it the most ideal for implementation on the 3D Kagome lattice structure.