P19104: HABIP-BioX
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Systems Design

Table of Contents

Team Vision for System-Level Design Phase

After finishing the Problem Definition phase, our team wants to have a detailed system level diagram at the end of this phase. In addition, resources such as power, data, and weight are to be taken account of as well. Due to the complexity of the system, a large number of parts are to be benchmarked and considered when selecting concepts. Feasibility analysis was done for several aspects of the system. At the end of this phase, Detailed Design will begin with a good idea of the subsystems and parts that will be used.

We were able to create a system architecture that will satisfy all the customer and engineering requirements developed in the previous phase.

Functional Decomposition

We started this phase by breaking down the need functionality of the high altitude balloon into smaller parts. We identified six major subsystems, each having a few levels of sub functions. The six sub functions are Attitude Control, Solar Power, Support/Protect BioX Cell, Communication, Software, and a Plant Growth Experiment.

Functional Decomposition

System Architecture Selection Process

System

System

The System Architecture Selection Process page goes through the selection of the system starting with benchmarking and ending with a Pugh Analysis.

BioCell Selection Process

The functional decomposition of the BioCell is shown below.

BioCell

BioCell

The BioCell Selection process page goes through the selection of the system starting with benchmarking and ending with a Pugh Analysis.

Communication System Selection Process

The functional decomposition of the communication is shown below.

Comm Functional Decomposition

Comm Functional Decomposition

The Communication System Selection process page goes through the selection of the system starting with benchmarking and ending with a Pugh Analysis.

Power Selection Process

The functional decomposition of the Power System is shown below.

Solar

Solar

The Power Selection process page goes through the selection of the system starting with benchmarking and ending with a Pugh Analysis.

Structure Selection Process

The functional decomposition of the structure is shown below.

Structure

Structure

The Structure Selection process page goes through the selection of the system starting with benchmarking and ending with a Pugh Analysis.

Feasibility

Environment Study

The SF1 will make it into the stratosphere, at 120,000ft (36.5km, 23mi) up into the air. In this layer there is most of the ozone layer. The area between 11km and 20km is the limit to where clouds exist and is where the jet stream exists. It is in this area that the balloon may travel at its maximum speed.
Atmosphere.PNG

Atmosphere.PNG

Air Pressure

The air pressure at this altitude will be ~5mb, or 0.005 atmospheres.
Air_pressure_vs_altitude.PNG

Air_pressure_vs_altitude.PNG

Temperature

Upon accent, the temperature around the balloon will drop to -60°C(-80°F) at 20km, then rise to ~ -30°C(-22°F) at its maximum altitude. The temperature in the Troposphere drops with increasing height at an average rate of 6.5°C/km because the atmosphere is mainly heated from below by the underlying ground surface. In the stratosphere, the temperature increases because ozone gas molecules, present in this layer, absorb ultraviolet sunlight creating heat energy.
Atmosphere_temperature.PNG

Atmosphere_temperature.PNG

Information on atmosphere found at: http://www.atmo.arizona.edu/students/courselinks/fall12/atmo336/lectures/sec1/structure.html

System Architecture: Designs and Flowcharts

System Architecture

In order to better show the interactions between different subcomponents, a block diagram of the systems was created and can be seen below.
System Architecture

System Architecture

The diagram shows how the power comes from a central system and is distributed to all of the subsystems. It also shows the flow of data through the system going to and from the communication system. This diagram is very high-level and a more detailed block diagram is shown below.

Detailed System View

Detailed System View

This diagram shows the communication protocols that are expected to be used between each of the subsystems as well as an expected power draws. For many of the subsystems it also shows the microcontroller that we plan on using.

BioCell Block Diagram

A block diagram of the Biocell is shown below.

BioX Cell

BioX Cell

Communication System

The portion of the communication system that will transmit and receive on the 2m wavelength is shown below.
Communication System Architecture - 2m

Communication System Architecture - 2m

The portion of the communication system that will transmit digital video is shown below.

Communication System Architecture - Video

Communication System Architecture - Video

Solar Power System

Solar Power System Architecture

Solar Power System Architecture

Payload Structure

Payload Structure Diagram

Payload Structure Diagram

Estimated Costs

Estimated Costs for each subsystem

Estimated Costs for each subsystem

System_estimated_costs.png

Risk Assessment

The risks identified in the Problem Definition phase were updated. The risks that are directly applicable to systems design are shown below.
System Design Risk Assessment

System Design Risk Assessment

A link to the full document can be found here:

Systems Level Design Documents/System Design Risk Assessment Revisited.xlsx

Design Review Materials

A link to the Pre-Read is here: Systems Level Design Documents/System_Design_Presentation.pptx

A link to the notes taken from the presentation is here: Systems Level Design Documents/System_Design_Presentation_notes.docx

Plans for next phase

Schedule

A Gantt chart describing the schedule for the next phase of MSDI is included here: Systems Level Design Documents/SF1_Schedule.pdf

Three-week plans for individual team members:

Member Three-Week Plan
Braeden Morrison 3_week_plans/Preliminary_Detailed_Design/BJM_3_Week_Plan_for_Preliminary_Detailed_Design.docx
Larissa Plaskon 3_week_plans/Preliminary_Detailed_Design/LFP_3_Week_Plan_for_Preliminary_Detailed_Design.docx
Jacob Felice 3_week_plans/Preliminary_Detailed_Design/JTF_3_Week_Plan_for_Preliminary_Detailed_Design.docx
Andrew Eberhard 3_week_plans/Preliminary_Detailed_Design/AJE_3_Week_Plan_for_Preliminary_Detailed_Design.docx
Joe Payne 3_week_plans/Preliminary_Detailed_Design/JDP_3_Week_Plan_for_Preliminary_Detailed_Design.docx
Ryan Tatu 3_week_plans/Preliminary_Detailed_Design/RNT_3 Week Plan for Preliminary Detailed Design.docx
Ben Cooper 3_week_plans/Preliminary_Detailed_Design/BEC_3_Week_Plan_for_Preliminary_Detailed_Design.docx

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