Drexel RockSAT Launch Readiness Review

Kelly Collett • Christopher Elko • Danielle JacobsonMay 27, 2012

LRR Presentation Contents• Section 1: Mission Overview

• Mission Statement• Mission Objectives

• Section 2: The Payload!• User’s Guide Compliance• Beta Prototype Testing

• Section 3: Check-In Readiness• Plans for Integration• Documentation

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Mission OverviewDrexel RockSat Team 2011-2012

Mission Statement

Develop and test a system that will use piezoelectric materials to convert

mechanical vibrational energy into electrical energy to trickle charge on-board power

systems.

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Mission Overview• Demonstrate feasibility of power generation

via piezoelectric effect under Terrier-Orion flight conditions

• Determine optimal piezoelectric material for energy conversion in this application

• Classify relationships between orientation of piezoelectric actuators and output voltage

• Data will benefit future RockSAT and CubeSAT missions as a potential source of power

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Payload DesignDrexel RockSat Team 2011-2012

Design Overview

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Microcontroller G-switch

Accelerometer ArrayPiezo Arrays

Camera

Flight Decks

Standoff Supports

Batteries

Payload Design beta

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Beta payload with wiring connections ready for vibration testing

• Beta payload includes modifications to:• Camera housing• Organization of EPS

components on top deck• Transistors and relays

used to control power for EPS and VVS

• Cantilever length: 3.0 in.

Physical Specs eurekasat payload

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Requirement UG Spec Status

Mass 2.42 lb

Volume ½ can H: 4.3”D: 9.3”

Payload CG 1”x1”x1” x0.23” y0.21” z0.43”

Activation Method 1.SYS.2 We think so…

Structure Mounts Top, bottom bulkheads

Sharing Fully Developed? Integration Successful

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PEA ICamera

Rectifier + Capacitor

PEA II

Rectifier + Capacitor

Accelerometer II

Rectifier + Capacitor

Rectifier +Capacitor

PEA III PEA IV

Electrical Design

9V Battery G-Switch Wallops

InternalMemory

3-AA Batteries

SD CardMemory

Accelerometer IArduino

Microcontroller

Power connectionData connection

Legend

Latching Relay

9V BatteryPower (G-switch=1)

Updates Since FMSTR• Beta prototype complete and tested• VVS functioning

• Switched to AA batteries, no regulator• Modified camera mounting bracket

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Testing Updates

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• Increased length of cantilevers• Lowered maximum output• Alpha: over 1 V for “diving board”• Beta: about 0.55 V

Testing Updates

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Mission Requirements

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Primary Objectives Complete?

Power generation via the piezoelectric effect under Terrier-Orion flight conditions Yes

Classify the relationships between the orientation of piezoelectric actuators and output voltage Yes

Ensure system activates upon launch Yes

Data is autonomously recorded to SD card Yes

Secondary Objectives

Visual data recorded to SD card Yes

Data collection systems are self powered Yes

Voltage generated purely from launch vehicle Yes

Accepted for flight with RockSAT-C program Yes

ALMOST, CAPTAIN!ARE YA READY KIDS?!

ReadinessReady!• Travel arrangements set• Payload is assembled and ready to go• Integration with TempleAlmost Ready!• Documentation• For Drexel Payload and Canister

• Check-in Procedure

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Integration

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Canister Sharing with Temple• Method of Integration: standoffs• Height: 9.07”• Combined Weight: 6.74 lb• Combined CG: x-1.32” y2.04” z2.10”• NOTE: material properties discrepancies• CG to be adjusted with systematic ballast

placement• Procedure: tighten standoffs

Complete Payload

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Complete Payload

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Temple

Drexel

øCanister Integration

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9.07”overallheight

9.30”overall

diameter

6.73 lbs.overallweight

standoffs

means of integration

Action Items• Finish up documentation• Mostly drawings• Parts accounting• Tidying of documents

• Ballasting, staking, etc.• To be completed after integration with Temple• Mostly at Wallops

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Check-In Inspections

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• Check-in procedure partially completed• So far so good

Final QuestionsDrexel RockSat Team 2011-2012

Questions• None right now! :D

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Thank you!Questions?