page 1 recovery discussion 11/4/2015. page 2 roles & responsibilities ? point of...

Recovery Discussion 11/4/2015

Roles & Responsibilities ?

Point Of Contact Responsibility

Alisson Clark

Liam Jaffe

Yash Pahade

Yumi Shridhar

Nivi Thomas

Ben Trowbridge

Chinmay Upadhye

Logic Documentation (nominal, off nominal)Sensor Actuator ListMilestone ScheduleRequirements (Competition, System) Team Coordinator Analysis Lead System Design Lead

STA

500

STA

117

9ST

A 12

23

STA

1722

STA

187

8

STA

248

8

STA 500

STA 1179STA 1223

STA 1722

STA 1878

STA 2488

STA

500

STA

117

9ST

A 1

223

STA

1722

STA

187

8ST

A 2

488

Competition Requirements ?

TESLA Recovery

Define Logic:1) Nominal – everything works perfectly (draft logic chart follows)2) Off-nominal cases

• Shorter burn times (20 sec, 15 sec, … 3 sec?• Longer burn times• Loss of stability• Other

Logic flow chart for all casesDefined what sensors are needed to implement logicDefine actuator requirements

TESLA

First Motion

Performance Calculation(ACC, V, D)

Nominal Operation

?

Engine Shutdown

?

YES YES

YES YES

NO

NO

Calculate•Decelerator deployment time or conditions (T1)•Main chute deployment conditions (T2)

DoesT = T1

?

NO

NO

Deploy Decelerator

Did Decelerator

Deploy?

Deploy Main Chute

DoesT = T2

?

Deploy Main Chute

NO

YES

End Recovery Routine

Off Nominal Deployment

Logic ?

Nominal Deployment LogicWhat is the criteria for “Nominal Operation”

How doe we determine this (sensors?)

What sensors and logic are required

Team to define logic for all off-nominal cases

Need to define T1 & T2 conditions and make sure we have the proper sensors

How do we know?

What is the voltage, power and time duration of the signal to fire the deployment device?

Potential Sensor Options:•GPS – Update Rate ?•X,Y,Z acceleration

• (integrate to get velocity & displacement)•Time•Barometric pressure•First motion switch

ACC = AccelerationV = VelocityD = DistanceT = time

TESLA Small Parachute Concept

Small pilot chutes available from 30” diameter and larger

Small Parachute

Main Parachute

Big Spring

TESLA Recovery Data Book

TESLA

Recovery Components

Jack Screws (3)

Tension Spool

Parachute

Push Plate

Ejection Spring

Attachment Fastener Cable

Terminal

Cable

Shroud Tube

Jacking Flange

Cable Retention

Collet

Cable Cutter Support

Cable Cutter

Terminal FittingFasteners Terminal

Fitting (6)

Fasteners Cutter Support (6)

Other Items:1.Bridle2.Bridle Fitting (2)3.Bridle Fitting Fasteners (4)4.Reefing System5.Pilot Chute?6.Pilot Chute cutter?7.Electrical Harness

TESLA Slider Reefing System

TESLA Example Reefing Systems

TESLA Deployment Bag Reefing System

TESLA Deployment Bag – We need to design one

http://www.fruitychutes.com/

https://www.apogeerockets.com/

http://www.parachutesplus.us/store/deployment-bags/

TESLA Pyro Initiated Gas Generation Actuator

TESLA Pyro Pin Pusher

page 1 recovery discussion 11/4/2015. page 2 roles & responsibilities ? point of...

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