system level design review - rochester institute of …edge.rit.edu/edge/p17105/public/systems level...
Post on 30-Aug-2018
214 Views
Preview:
TRANSCRIPT
System Level Design Review
HABIP High Altitude Balloon Instrumentation Platform
P17104 & P17105October 6, 2016
Team Members
2
Team Team Member Major Team Roles Other Roles
Communications
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
Data Acquisition and Control
Systems
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
Agenda1. Morphological & Pugh Charts2. System Block Diagram3. Flow Diagrams4. Sub-Systems
a. Structureb. Power Consumption & Thermal Routingc. Video Acquisition & Storaged. Microprocessorse. Battery Typesf. IMU and Reaction Wheel
g. ATV Transmitterh. 2m Transceiver
5. Future Plans6. 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)
16
Separate Batteries for System, GRSS, APRS
Battery Power -> Regulators -> Parts -> Heat -> Structure -> Environment
Flow Diagram (Energy)
17
Separate Batteries for System, GRSS, APRS
Battery Power -> Regulators -> Parts -> Heat -> Structure -> Environment
Flow Diagram (Energy)
18
Separate Batteries for System, GRSS, APRS
Battery Power -> Regulators -> Parts -> Heat -> Structure -> Environment
Flow Diagram (Structure)
19
Wind Force and HAB create torque, which is measured by IMUController reads this data, and commands the reaction wheel on and off
Flow Diagram (DAQCS)
20
Sensors ------------------------------
Raspberry Pi------------------------------
SD Card ------------------------------
COMMS
Flow Diagram (COMMS)
21
In general:DAQCS -> Microcontroller -> OSD & ATV Transmitter OR Transceiver
Platform Structure
22
“ 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
Platform Structure
23
“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
COMMS Power Consumption - Thermal Routing
Thermal Routing Scenarios
1) Heat cannot be expelled fast enough2) Not enough heat is generated / stored3) 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:- 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)
25
- TI MPS430 MPU- Bare Metal firmware- Up to 8xSPI, 4xI2C, 4xUART
Pros:- 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
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
27
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
Ideal system battery:- Low resistance at low temperature, high energy density, non-explosive
Most common rechargeable battery chemistries:
DAQCS Power Estimate
28
● 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 Based on motor selection / characterization
TOTAL: ~ 1100 + Motor
IMU & Reaction Wheel
29
IMU’s maximum sampling rate: 819.2 Hz
Difference in the angular acceleration of the instrumentation platform to the reaction wheel
Angular acceleration of the instrumentation platform
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-RCbUp to 1.5W out
Used in METEOR 2005
31
Videolynx VM-70XControlled 0.5-5W out
High power consumption
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
37
Questions?
38
Additional Information Slides
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
48
Additional testing facilities are available in the CEMA lab in Slaughter.
Buzzer Feasibility - DAQCS
49
Temperature Range: -20 to 65 degrees Celsius Storage Temperature: -40 to 85 degrees Celsius
Sound Range: 92 to 103 dB
top related