Launch Vehicle Structural Requirements
The mission of the MidSTAR structure is to support and protect the vital systems and payloads through launch, deployment and operation in the space environment.
MidSTAR is a low-cost, quick response platform built to accommodate small payloads with relatively small adjustments to the satellite bus. The basic structural components, i.e. side plates, solar panels, ESPA ring attachment, and deck plates must change only incrementally from mission to mission. Shelves, experiments, and wiring harness must be capable of changing readily with minimal restraints. The structure must survive launch on board the Atlas V or the Delta IV EELVs.
- Right handed coordinate frame parallel to ESPA coordinate frame;
- Origin at outer edge of attachment ring;
- Maximum mass of 250 kg, including mass of the separation system;
- Center-of-gravity less than 20” from origin on +X axis;
- Useable volume is 24”x 28”x 38”, including the separation system
- Fundamental frequency greater than 35 Hz;
- Sustain 10.6g in axial and lateral direction with safety factor of 1.25;
- Separation mount bolt circle consisting of of 24 – ¼” x 28 holes, spaced every 15º.
These requirements are established by the ESPA User's Guide
The coordinate frame of the ESPA is shown below:
While the mission requirements for MidSTAR state that it must not exceed 250kg, the design choice for MidSTAR-1 confines the mass to 120kg within a tolerance of 10kg.
- Mass properties report
- Envelope Drawings
- MIDStar in the Envelope
- Overview of the Spacecraft Structure - Model
- Exploded and Labeled view of components
- Numbering System
- Lightband Interface Drawing
- Master Parts List
- Fastener spreadsheet
- Assembly Concept
- Fundamental Modes
- CG Analysis
- Fastener Analysis(OLD: Currently Under Review 03/30/06)
- MOS Spreadsheet for Individual Fasteners (03/30/06)
- Factor of Safety Table