System Level Design Review HABIP High Altitude Balloon Instrumentation Platform P17104 & P17105 October 6, 2016
Team Members Team Communications Data Acquisition and Control Systems Team Member Major Team Roles Other Roles Adam Steenkamer EE Project Manager Component Standardization Manager Connor Goldberg EE Lead Embedded Engineer Agency Compliance Manager Ian Prechtl ME Lead Mechanical Engineer Thermal Manager Matt Zachary EE Lead Hardware Engineer Wire Manager Sydney Kaminski ME Project Manager Weight, Volume, and Other Shared Mechanical Attributes Manager Lincoln Glauser EE Lead Embedded Engineer User Guide Documentor Chris Schwab EE Lead Hardware Engineer Power Manager Steven Giewont EE Lead Controls Engineer Instrumentation Package/Integrator 2
Agenda 1. 2. 3. 4. Morphological & Pugh Charts System Block Diagram Flow Diagrams Sub-Systems a. Structure b. Power Consumption & Thermal Routing c. Video Acquisition & Storage d. Microprocessors e. Battery Types f. IMU and Reaction Wheel g. ATV Transmitter h. 2m Transceiver 5. Future Plans 6. Additional Project Information 3
Morphological Chart - COMMS 4
Morphological Chart - COMMS 5
Pugh Chart - COMMS 6
Morphological Chart - DAQCS 7
Morphological Chart - DAQCS 8
Pugh Chart - DAQCS 9
Screening Matrix - DAQCS 10
Scoring Matrix - DAQCS 11
Concept Drawings 12
System Block Diagram 13
System Block Diagram (DAQCS) 14
System Block Diagram (COMMS) 15
Flow Diagram (Energy) Separate Batteries for System, GRSS, APRS Battery Power -> Regulators -> Parts -> Heat -> Structure -> Environment 16
Flow Diagram (Energy) Separate Batteries for System, GRSS, APRS Battery Power -> Regulators -> Parts -> Heat -> Structure -> Environment 17
Flow Diagram (Energy) Separate Batteries for System, GRSS, APRS Battery Power -> Regulators -> Parts -> Heat -> Structure -> Environment 18
Flow Diagram (Structure) Wind Force and HAB create torque, which is measured by IMU Controller reads this data, and commands the reaction wheel on and off 19
Flow Diagram (DAQCS) Sensors -----------------------------Raspberry Pi -----------------------------SD Card -----------------------------COMMS 20
Flow Diagram (COMMS) In general: DAQCS -> Microcontroller -> OSD & ATV Transmitter OR Transceiver 21
Platform Structure The Pill The Disk Disk 3 Layers (Top,Middle,Bottom) Increased Torque Control Req. Reduced External Inertial Effects Increased radial distance Reduced normal distance Pill Multi Layer Reduced Torque Control Req. Increased External Inertial Effects Reduced radial distance Increased normal distance 22
Platform Structure Pill Disk 3 Layers (Top,Middle,Bottom) Increased Torque Control Req. Reduced External Inertial Effects Increased radial distance Reduced normal distance Multi Layer Reduced Torque Control Req. Increased External Inertial Effects Reduced radial distance Increased normal distance The Disk 23
COMMS Power Consumption - Thermal Routing Thermal Routing Scenarios 1) 2) 3) Heat cannot be expelled fast enough Not enough heat is generated / stored Over the mission duration, components remain in operational range ----> From primary analysis, contrary to other projects, excessive cooling will not be an issue. Tested using air insulator distributed network -----> Next Step : Expand model to complete system
Microprocessors - Broadcom BCM2835 Chipset Full OS support (Linux) 2x I2C, 2xSPI, 1xUART, 1x1Wire Pros: - TI MPS430 MPU Bare Metal firmware Up to 8xSPI, 4xI2C, 4xUART Pros: Fully integrated MIPI camera interface Easy SD card access No HW validation for bringup Rapid prototype (<1hour for camera) $5 Cons: - - No FRAM memory Dependency on 3rd party HW High power usage (~250mA) - Low power FRAM memory Full access to all HW and documentation Cons: - Not capable of high-speed camera interfacing Requires a custom PCB (HW bringup) Requires special SD card driver 25
Video/Sensor Acquisition & Storage - Raspberry Pi Zero (x4) - Controls Raspberry Pi Camera - Controls local/external sensor acquisition - Direct storage to SD card - Raspberry Pi Camera v2.1-8mp (3280 x 2464 pixels) - 1080p30 video capture (adjustable) - Digital image stabilization - Len focus 1m to infinity - Photo: jpeg, raw, etc. Video: raw h.264 - Each Zero has its own I2C sensor network - Temperature, pressure - Data stored through Linux file system - Simply insert SD card into host PC for data retrieval - Or use scp over serial 26
Battery Types Ideal system battery: - Low resistance at low temperature, high energy density, non-explosive Most common rechargeable battery chemistries: Battery Chemistry Resistance vs. Temperature Energy Density Low Discharge Risk Form Factor NiCd Good Good No AA, AAA, 9V, C, D, multi-cell packs NiMH Good Good No AA, AAA, 9V, C, D, multi-cell packs Lead Acid Poor Poor No Sealed container (ex: car battery) Lithium Ion Best Best Yes multi-cell pouches, portable power docks Lithium Polymer Best Best Yes multi-cell pouches, portable power docks Alkaline Poor Poor No AA, AAA, 9V, C, D, multi-cell packs 27
DAQCS Power Estimate Major components - Sensor Acquisition and Storage (via Raspberry Pi Zero) - Sensor Power (temperature + pressure) - Reaction Wheel Controller Power (MSP430FRx and IMU) - Reaction Wheel Motor power System voltages are still TBD, therefore power is TBD ( based on component selection) Estimate of system current draw: System Current (ma) Notes Sensor Acquisition and Storage 4 x 250 = 1000 Four Zero s capturing 1080p30 Sensors 20 x 2 = 40 4 external, 4 internal, 12 redundant Reaction Wheel Controller 60 Reaction Wheel Motor TBD TOTAL: ~ 1100 + Motor Based on motor selection / characterization 28
IMU & Reaction Wheel IMU s maximum sampling rate: 819.2 Hz Angular acceleration of the instrumentation platform Difference in the angular acceleration of the instrumentation platform to the reaction wheel 29
ATV Transmitter Preliminary distance analysis shows we need close to 5W of output RF power for ATV This will need to be verified by testing the ATV system 30
ATV Transmitter PC Electronics TXA5-RCb Up to 1.5W out Used in METEOR 2005 Videolynx VM-70X Controlled 0.5-5W out High power consumption 31
2m Transceiver 32
Future Plans: COMMS Gantt Chart 33
Future Plans: COMMS Improved thermal analysis Structural analysis Part selection, especially: 2m Transceiver 70cm ATV Transmitter Improved weight, budget, & power consumption analyses Prototyping APRS GPS Analog camera & OSD unit Plans for other parts 34
Future Plans: DAQCS Gantt Chart 35
Future Plans: DAQCS Prototype camera, Raspberry Pi, and sensor interface Prototype of the reaction wheel & test set-up Environmental test procedures written Reaction wheel test procedure written Completion of BOM Completion of the majority of engineering documentation (i.e. models & drawings) 36
Questions? 37
Additional Information Slides 38
Concept Drawings - DAQCS 39
Concept Drawings - DAQCS 40
Functional Decomposition 41
Functional Decomposition 42
Functional Decomposition 43
Functional Decomposition 44
Additional Feasibility Completed - DAQCS Budget Feasibility Weight Feasibility Environmental Testing Chamber Feasibility Buzzer Feasibility 45
Budget Feasibility - DAQCS 46
Weight Feasibility - DAQCS 47
Environmental Chamber Feasibility - DAQCS Additional testing facilities are available in the CEMA lab in Slaughter. 48
Buzzer Feasibility - DAQCS Temperature Range: -20 to 65 degrees Celsius Storage Temperature: -40 to 85 degrees Celsius Sound Range: 92 to 103 db 49