Review of Mechanical Design and Dynamic Qualification Practices for 3U CubeSats

Abstract

CubeSats have emerged as cost-effective and versatile platforms for scientific, educational, and commercial missions. Within this category, the 3U configuration offers an optimal balance between payload capacity, system complexity, and mission flexibility. This paper reviews the mechanical design and dynamic qualification of 3U CubeSats, emphasizing structural materials, manufacturing methods, and assembly strategies. Modal analysis and vibration qualification are discussed as critical processes to ensure compliance with launch vehicle requirements and long-term mission reliability. Reported modal analyses indicate that the natural frequencies are primarily governed by the stiffness-to-mass ratio and the quality of structural construction, highlighting the influence of both design and manufacturing precision on dynamic behavior. By consolidating published data and identifying structural and dynamic performance trends, this work provides guidance for advancing CubeSat design practices and supporting future mission success.