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P18104: High Altitude Balloon Instrumentation Package
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Preliminary Detailed Design

Table of Contents

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Project Recap

The High Altitude Balloon Instrumentation Platform (HABIP) is a multi-functional system that allows users to collect and analyze data from near-space experiments. The device records internal data, and also telemeters data that has been gathered from an array of sensors to a ground communications center. The goal of this project is to create the aforementioned array in a configuration that is lightweight, cheap to manufacture, and highly reliable. The final product will undergo a mission lasting for several hours in harsh conditions, and will parachute back to Earth from an altitude of over 100,000 feet to be recovered and analyzed. This project seeks to improve upon the progress of two former MSD groups: P17104 and P17105, and is intended to be a design which can be further improved in the future.

Team Vision for Preliminary Detailed Design Phase

Phase Summary:

Designs, Drawings, Schematics, Flow Charts

Purpose

Define the layout and design of the final product.

Updated Block Diagram

Block Diagram

Block Diagram

To view the full document, click here.

Structures

Preliminary CAD Model

Preliminary CAD Model

Initial CAD model that allows for placement of components and basic simulation and analysis.

Motor Controller

Motor Control Flow Chart

Motor Control Flow Chart

Demonstrates logic of motor control algorithm.

Main Board Redesign

Updated schematics can be found here.

Other Design Updates

Feasibility: Prototyping, Analysis, Simulation

Purpose

Complete initial testing, and gather both qualitative and quantitative data that will drive decision making for continued engineering design. Simulate conditions that the final product will experience in flight.

Preliminary Thermal Analysis

Preliminary Thermal Analysis

Preliminary Thermal Analysis

Initial ANSYS simulation to demonstrate how 3D model can be evaluated using various sources of energy and the frame as an instrument for conduction/radiation.

Reaction Wheel Algorithm Analysis

First Reaction Wheel Test

First Reaction Wheel Test

The algorithm for last year’s motor, as well as comments on the plan moving forward can be seen below:

Z RPM = RPM * 0.07326/6
This needs to be updated to compensate for new IMU.
error = z gyroscope in rpm
integral = integral + error
This can remain the same
control speed = (kp*error)+(ki*integral)
kp was 120 and ki was -0.2. These values are going to need to be updated to compensate for both the new weight and the new IMU. The new IMU may return different values than the old one, and this will be compensated for here. This is task number 2 in the list above.
TACCR1= (Desired-Min Input)(Max Output-Max Input ) / ((Max Input-Min Input) )+Min Output
This can stay the same, but may need to multiply it by a constant. Because the clock speed is faster on the Teensy than it was on the MSP430, this may need to be increased by a constant in order to keep the maxon controller happy.
TACCRO = 20000
This will need to be increased by the same constant as above.

Issues with code:

Test Plans

Purpose

Demonstrate objectively the degree to which the Engineering Requirements are satisfied, and determine what updates must be made.

Thermal/Structural Analysis

There is no physical testing thermal performance planned, as physical testing will not provide useful results and will take too much time. Testing would need to be done in a vacuum chamber with a high level of incident radiation. As of now, we do not have the resources or time required to create these conditions. Analysis can and will be completed with FEA instead, using ANSYS.

Steps:

Information needed to complete simulation:

Inertial Measurement Unit (LSM9DS1)

Steps:

Teensy Microcontroller

Steps:

Reaction Wheel Stabilization

Steps:

Digital Video Transmission

Steps:

Bill of Material (BOM)

Purpose

Confirm that all components are accounted for in the final design.
Preliminary BOM

Preliminary BOM

Click here for the working document.

Risk Assessment

Mitigated Risks

Ongoing Risks

New Sources of Risk

Plans for Next Phase

Gantt Chart

Gantt Chart

Gantt Chart

Click here for the working document.

Individual Plans

Team Member

James Brumbaugh

Matthew Chase

Brandon Codi

Jacob Kennedy

Nicholas Lindley

Dan Mitchell

Jake Timmons

Design Review Materials

Block Diagram
Main Board Schematics
BOM
Gantt Chart

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