P19104: HABIP-BioX
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Structure Preliminary Detailed Design

Table of Contents

Structure Preliminary Detailed Design

Feasibility: Prototyping, Analysis, Simulation

Preliminary Component Area/Temperature Requirements

Estimated area and temperature requirements were recorded for each component to add detail to the structure design. Central housing volume was estimated using these size estimates. In addition,temperature requirements and 4 week flight considerations required all components to be located internally.

Estimated Component Area and Temperature Limits

Estimated Component Area and Temperature Limits

Preliminary Thermal Feasibility

The first step of the thermal feasibility was identifying the modes of heat loss during flight. Heat will be lost through internal radiation, internal convection, conduction, external convection and external radiation. Thermal resistances were used to calculate the internal temperature. The temperature limit was set at 0 degrees celsius due to charging limits of the selected battery. Using the model it was found that 13 watts of heat would need to be dissipated internally to keep the air temperature above the minimum temperature.

Thermal Model Schematic

Thermal Model Schematic

Drawings, Schematics, Flow Charts, Simulations

Preliminary CAD Design

Using the components size requirements a CAD model was made for the structure and central housing. Structure is made of

-Aluminum sheet to mount solar panel and suspend structure

-Aluminum frame for central structure

-Perforated aluminum to mount components

-Foam insulation to maintain operating temperature range

Next steps include

-developing mounting points for balloon, insulation, camera and receiver

-designing layout of the boards including standoffs

-defining fastener type for each component

Central Structure

Central Structure

Updated Weight Budget

Updated weight budget was developed following design changes. Total weight was found to be just under 12 lbs. This drop is mainly due to the reduction in number of BioX Cells that will be launched.

Updated Weight Budget

Updated Weight Budget

Bill of Material (BOM)

Structure Bill of Materials

Structure Bill of Materials

ER10: Component Operating Temperature

The goal of this test is to validate that all components in the structure remain at a safe operating temperature. This minimum temperature is 0 degrees celsius which is the minimum charging temperature for the battery. Power estimates will be made for each component and a simulation will be developed in Solidworks.

ER12: Structure Attitude Control

The goal of this test is to validate the functionality of the reaction wheel. A prototype platform will be built to mount reaction wheel and components. The reaction wheel data will be recorded and analyzed to confirm rotation requirement is met and components remain secured to the platform.

ER13/15:Payload Weight/Factor of Safety

SolidWorks FEA can be used to analyze structure factor of safety. Iterative process can be used to optimize structure weight and factor of safety. Weight must be below 3 pounds and factor of safety must above 2.

ER17: Free Fall Survivability

Payload ideally will withstand a fall from 15 feet. To test this, the frame can be filled with unpopulated boards and dropped from ideal height.


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