Structure
Structure Overview
The Structure subsystem provides the mechanical framework of the satellite, ensuring all components are securely integrated while meeting dimensional and launch requirements, and maintaining structural integrity throughout the mission.
Using Aluminum 7075 for the rails and FR4 for the PCBs, Kumo retains strength and temperature senditivity. The total weight amassing 3.3kg in the dimensions of 10x10x34.05.
Mechanical Design
Since Kumo is the first 3U satellite in the BIRDS program, the Structure team adopted a slot-type design inspired by previous developments at Kyushu Institute of Technology, including the Leopard and CURTIS projects. This approach enables a modular and efficient internal layout, simplifying assembly while ensuring reliable support and alignment of all subsystems.
The Structure team develops the satellite’s mechanical components, including the six-panel main frame and integration elements for subsystems such as the batteries, camera, and ADCS. The structure is primarily made of Aluminum 7075-T651 for its high strength-to-weight ratio, with smaller parts in PEEK and all printed circuit boards and panels manufactured from FR4.
Assembly & Integration
From individual subsystems to the complete satellite, the Structure team ensures safe and precise assembly. A standardized step-by-step procedure is followed to guarantee consistency, proper fit, and reliable integration of all components.
Testing
The Structure team ensures that all interfaces, dimensions, and mechanical properties meet JAXA and JSSOD requirements, including constraints such as parallelism and deployment compatibility. The team also performs vibration testing to evaluate the satellite’s behavior during launch and to confirm its structural integrity afterward.
