The MAGIC Tether Experiment A Demonstration of DINOs

  • Slides: 76
Download presentation
The MAGIC Tether Experiment A Demonstration of DINO’s MAGIC Boom University of Colorado Friday,

The MAGIC Tether Experiment A Demonstration of DINO’s MAGIC Boom University of Colorado Friday, April 02, 2004

The MAGIC Tether Experiment 3/10/2021 The MAGIC Tether Experiment • Special Thanks To the

The MAGIC Tether Experiment 3/10/2021 The MAGIC Tether Experiment • Special Thanks To the KC-135 Team for All of Their Hard Work and Great Contributions – – – – Cook, Evan Martinez, Mike Mc. Arthur, Grayson Mohler, Andrew Parker, Jeff Seibert, Mike Stamps, Josh Worster, Kate Colorado Space Grant Consortium & DINO 2

The MAGIC Tether Experiment 3/10/2021 Background – DINO • Nadir Pointing – Gravity Gradient

The MAGIC Tether Experiment 3/10/2021 Background – DINO • Nadir Pointing – Gravity Gradient Stabilization • Deployable Boom – Primary Satellite » 25 kg – Tip Mass » 5 Kg – MAGIC Tether » Mechanically-Actuated Gravity. Induced Control » Stanley Tape Measure » 6 m Long – Lightband » 2 +/-. 5 ft/sec » Full deployment after 10 sec Colorado Space Grant Consortium & DINO Tip Mass Tether DINO 3

The MAGIC Tether Experiment 3/10/2021 Why do This Test • Is this System Even

The MAGIC Tether Experiment 3/10/2021 Why do This Test • Is this System Even Feasible? – Dynamics of the Semi-Rigid System are Poorly Understood – Experimental Results of Energy Dissipation • Over damping will result in inadequate deployment – Poor gravity gradient stabilization » Science objectives » ADCS power Draw • Under damping would shock the system – Could damage Electronics and Cameras – Could recoil, causing a collision Colorado Space Grant Consortium & DINO 4

The MAGIC Tether Experiment 3/10/2021 Expected Results • The MAGIC Tether team expects the

The MAGIC Tether Experiment 3/10/2021 Expected Results • The MAGIC Tether team expects the following things: – Four standard springs will accelerate the relative velocity of the tip mass with respect to the primary satellite to approximately 1. 7 ft/s (0. 518 m/s). – The tip-off rate of the deployment to be less than 1°/s in each axis. – Given a deployment velocity of 1. 7 ft/s, the optimal value of x 0 to be approximately 0. 66” to critically damp the system’s motion as the tether is fully deployed. – The semi-rigid tape to be deployed in a controlled fashion without any recoil at the end of its deployment. Colorado Space Grant Consortium & DINO 5

The MAGIC Tether Experiment 3/10/2021 Experiment Objectives 1. To measure the large-scale and small-scale

The MAGIC Tether Experiment 3/10/2021 Experiment Objectives 1. To measure the large-scale and small-scale dynamics in the deployment • Linear and angular accelerations 2. To empirically measure how the energy in the system can be dissipated • • Spring force in the slow-down mechanism Critically damp tip mass’ motion 3. To demonstrate a successful deployment of DINO’s MAGIC Boom Colorado Space Grant Consortium & DINO 6

The MAGIC Tether Experiment 3/10/2021 Overview of the Experiment • KC-135 • Heavy Sat

The MAGIC Tether Experiment 3/10/2021 Overview of the Experiment • KC-135 • Heavy Sat Light Sat – 14. 6 kg (32. 2 lbs) • Light Sat – 8. 1 kg (17. 8 lbs) Tether • Tether – Two lengths of Stanley Tape Measure (1. 0 in) – 4 ft (1. 22 m) Heavy Sat • Sensors – 6 Accelerometers – 6 Rate Gyros Safety Straps • Equipment Containment System Colorado Space Grant Consortium & DINO 7

The MAGIC Tether Experiment 3/10/2021 Structure • • The structure on each of the

The MAGIC Tether Experiment 3/10/2021 Structure • • The structure on each of the two satellites (Heavy and Light Sat ) is composed of two 1/8” 6061 Al plates connected by 4”-tall 1/4" 6061 Al box walls. All sharp edges will be covered with pipe insulation Damping System TAZ Foam Padding Colorado Space Grant Consortium & DINO 8

The MAGIC Tether Experiment 3/10/2021 Heavy Sat The Heavy Sat will have an overall

The MAGIC Tether Experiment 3/10/2021 Heavy Sat The Heavy Sat will have an overall mass of approximately 14. 6 kg and dimensions of 18” x 6”. • • Circular inner plate Male mating adapter TAZ Deployment springs Data loggers Dummy loads Sensors and batteries Containment box • Hand holds • Pipe insulation Data Logger Colorado Space Grant Consortium & DINO Data Logger 9

The MAGIC Tether Experiment 3/10/2021 Light Sat The Heavy Sat will have an overall

The MAGIC Tether Experiment 3/10/2021 Light Sat The Heavy Sat will have an overall mass of approximately 14. 6 kg and dimensions of 18” x 6”. • • • Circular inner plate Female mating adapter Spring Adapters Data loggers Dummy loads Sensors and batteries containment box • Hand holds • Pipe insulation • Braking System Data Logger Colorado Space Grant Consortium & DINO Data Logger 10

The MAGIC Tether Experiment 3/10/2021 Entire Assembly Colorado Space Grant Consortium & DINO 11

The MAGIC Tether Experiment 3/10/2021 Entire Assembly Colorado Space Grant Consortium & DINO 11

The MAGIC Tether Experiment 3/10/2021 Push off Springs x 4 • Based on Planetary

The MAGIC Tether Experiment 3/10/2021 Push off Springs x 4 • Based on Planetary System’s Lightband springs • K = 22. 5 lb/in (Per Spring) • Finitial = 60 lb (Total) Colorado Space Grant Consortium & DINO 12

The MAGIC Tether Experiment 3/10/2021 Tether Description • The semi rigid tether (SRT) –

The MAGIC Tether Experiment 3/10/2021 Tether Description • The semi rigid tether (SRT) – – Two face-to-face Tape Measures Commercial, off the shelf part Colorado Space Grant Consortium & DINO 13

The MAGIC Tether Experiment 3/10/2021 Tether Mounting • • Deployment / Braking System mounted

The MAGIC Tether Experiment 3/10/2021 Tether Mounting • • Deployment / Braking System mounted in Light Sat (Tip Mass) Boom mounted to Heavy Sat (Main Satellite) with a tether attachment system (TAZ), designed to maintain the rigid natural shape of the tether, while providing a secure attachment. Colorado Space Grant Consortium & DINO 14

The MAGIC Tether Experiment 3/10/2021 Deployment System Colorado Space Grant Consortium & DINO 15

The MAGIC Tether Experiment 3/10/2021 Deployment System Colorado Space Grant Consortium & DINO 15

The MAGIC Tether Experiment 3/10/2021 Damping System • 42 Teeth per Rotation • •

The MAGIC Tether Experiment 3/10/2021 Damping System • 42 Teeth per Rotation • • 366 Teeth per Full Deployment 3. 1 J Total Energy • . 0085 J / Tooth • Two 2. 5 inch spools • Geared to counter rotate • Ratchet and Pawl • Pawl Spring Loaded • Adjustable Initial Compression Colorado Space Grant Consortium & DINO 16

The MAGIC Tether Experiment 3/10/2021 Damping System Colorado Space Grant Consortium & DINO 17

The MAGIC Tether Experiment 3/10/2021 Damping System Colorado Space Grant Consortium & DINO 17

The MAGIC Tether Experiment 3/10/2021 Mechanical Dial • In Flight Spring Adjustment • .

The MAGIC Tether Experiment 3/10/2021 Mechanical Dial • In Flight Spring Adjustment • . 55 in -. 75 in • Linear Transducer Colorado Space Grant Consortium & DINO 18

The MAGIC Tether Experiment 3/10/2021 Release System • Deployment initiation – Mechanical System –

The MAGIC Tether Experiment 3/10/2021 Release System • Deployment initiation – Mechanical System – Hand held actuating lever • Bicycle brake – Release cable – Switch • Incorporated into handle • Initiates data collection Colorado Space Grant Consortium & DINO 19

The MAGIC Tether Experiment 3/10/2021 Testing DAY 1 • Set Spring to maximum compression,

The MAGIC Tether Experiment 3/10/2021 Testing DAY 1 • Set Spring to maximum compression, . 75 in (Over Damped) • Position Test Equipment • Deploy • Reset • Decompress spring. 05 in • Repeat until. 55 in compression is reached (Under Damped) DAY 2 • Set Spring to maximum compression in range of interest • Position Test Equipment • Deploy • Reset • Decompress spring desired amount • Repeat until minimum compression in range of interest is reached Colorado Space Grant Consortium & DINO 20

The MAGIC Tether Experiment 3/10/2021 Data Collection • There will be four sources of

The MAGIC Tether Experiment 3/10/2021 Data Collection • There will be four sources of data in the MAGIC Tether Experiment: – Qualitative observations by the flyers and by the digital video camera – Quantitative measurements of acceleration by the six single-axis accelerometers – Quantitative measurements of angular velocities by the six single-axis gyroscopes – Quantitative measurements of braking spring compression by the linear transducer Colorado Space Grant Consortium & DINO 21

The MAGIC Tether Experiment 3/10/2021 Safety • Restraint Straps – Four cinch straps to

The MAGIC Tether Experiment 3/10/2021 Safety • Restraint Straps – Four cinch straps to hold satellite to base plate during Takeoff/landing – Two Velcro straps for satellite securing during flight – Velcro connection between Heavy Sat and base plate during flight • Safety straps – 10’ straps connected from the base plate to each satellite – 6’ strap connecting each satellite – Braided steel rated to 1000 lbs. • Safety pin – Prevent accidental deployment • • Padding on all metal edges Four handholds per satellite Safety straps attached to all tools Fuses installed on electrical lines Colorado Space Grant Consortium & DINO 22

The MAGIC Tether Experiment 3/10/2021 Results • Trends will be extrapolated and scaled to

The MAGIC Tether Experiment 3/10/2021 Results • Trends will be extrapolated and scaled to DINO’s full Deployment length and weight. • What will happen to the satellite if the damping system does not perform precisely as planned? • What are the risks to the Satellite? • Does the Tether “explode” violently? • Is the deployment controllable? • Does the damping occur as expected? • Real world experience • Will result in a safer, more reliable system for DINO Colorado Space Grant Consortium & DINO 23

The MAGIC Tether Experiment 3/10/2021 Appendix Colorado Space Grant Consortium & DINO 24

The MAGIC Tether Experiment 3/10/2021 Appendix Colorado Space Grant Consortium & DINO 24

The MAGIC Tether Experiment FEA for KC-135 Experiment Grayson Mc. Arthur

The MAGIC Tether Experiment FEA for KC-135 Experiment Grayson Mc. Arthur

The MAGIC Tether Experiment 3/10/2021 G-Load Specs Takeoff/landing - Forward 9 g’s - Aft

The MAGIC Tether Experiment 3/10/2021 G-Load Specs Takeoff/landing - Forward 9 g’s - Aft 3 g’s - Down 6 g’s - Lateral 2 g’s - Up 2 g’s 3 g’s in any direction - Randomly picked 3 configurations to simulate the structure being dropped Colorado Space Grant Consortium & DINO 26

The MAGIC Tether Experiment 3/10/2021 FEA Setup Program used for analysis → Cosmos. Works

The MAGIC Tether Experiment 3/10/2021 FEA Setup Program used for analysis → Cosmos. Works Takeoff/landing - Load acts through the center of gravity - Outer face of the outer panel on the light side restrained as immovable/no translation to simulate attachment to base plate - Global size of nodes set at 0. 44469 in. with a tolerance of 0. 02223 in. - Yield strength of Al 6061 used as max. load = 145 MPa or 21030. 51 psi - Factor of safety set at 2 based on the yield strength Colorado Space Grant Consortium & DINO 27

The MAGIC Tether Experiment 3/10/2021 FEA Setup Con. 3 g’s in any direction -

The MAGIC Tether Experiment 3/10/2021 FEA Setup Con. 3 g’s in any direction - Load acts through the center of gravity - Global size of nodes set at 0. 44469 in. with a tolerance of 0. 02223 in. - Yield strength of Al 6061 used as max. load = 145 MPa or 21030. 51 psi - Factor of safety set at 2 based on the yield strength ► Thin edge faces of outer plates set as immovable/no translation to simulate the structure being dropped on those two edges Colorado Space Grant Consortium & DINO 28

The MAGIC Tether Experiment 3/10/2021 Results Stress: Von Mises (VON) - Measured in pounds

The MAGIC Tether Experiment 3/10/2021 Results Stress: Von Mises (VON) - Measured in pounds per square inch - VON = (0. 5[(P 1 -P 2)2+(P 1 -P 3)2+(P 2 -P 3)2])1/2 - P 1, P 2, P 3 are principle stresses - Measures stress intensity required for a material to start yielding Strain: Equivalent Strain (ESTRN) Displacement: Resultant (URES) - Measured in inches - Adds displacement vectors in X, Y, Z direction to get a resultant vector Design Check - FOS < 2 area shows as red - FOS > 2 area shows as blue Colorado Space Grant Consortium & DINO 29

The MAGIC Tether Experiment 3/10/2021 Stress Colorado Space Grant Consortium & DINO 30

The MAGIC Tether Experiment 3/10/2021 Stress Colorado Space Grant Consortium & DINO 30

The MAGIC Tether Experiment 3/10/2021 Strain Colorado Space Grant Consortium & DINO 31

The MAGIC Tether Experiment 3/10/2021 Strain Colorado Space Grant Consortium & DINO 31

The MAGIC Tether Experiment 3/10/2021 Displacement Colorado Space Grant Consortium & DINO 32

The MAGIC Tether Experiment 3/10/2021 Displacement Colorado Space Grant Consortium & DINO 32

The MAGIC Tether Experiment 3/10/2021 Design Check Colorado Space Grant Consortium & DINO 33

The MAGIC Tether Experiment 3/10/2021 Design Check Colorado Space Grant Consortium & DINO 33

The MAGIC Tether Experiment 3/10/2021 Conclusions The structure will be able to withstand all

The MAGIC Tether Experiment 3/10/2021 Conclusions The structure will be able to withstand all the prescribed loads as indicated in NASA document AOD 33897 Experiment Design Requirements and Guidelines NASA 931 KC 135 A Structure will survive a 3 g impact such as being dropped by the flight crew during transition from 0 g to 2 g Colorado Space Grant Consortium & DINO 34

The MAGIC Tether Experiment 3/10/2021 Issues and Concerns Mesh resolution was limited due to

The MAGIC Tether Experiment 3/10/2021 Issues and Concerns Mesh resolution was limited due to computer memory and time limitations Boundary conditions being appropriate for load case Colorado Space Grant Consortium & DINO 35

The MAGIC Tether Experiment Onboard Support Equipment Containment System (ECS)

The MAGIC Tether Experiment Onboard Support Equipment Containment System (ECS)

The MAGIC Tether Experiment 3/10/2021 Entire Assembly Colorado Space Grant Consortium & DINO 37

The MAGIC Tether Experiment 3/10/2021 Entire Assembly Colorado Space Grant Consortium & DINO 37

The MAGIC Tether Experiment 3/10/2021 Base Plate • . 125 -. 25 in Al

The MAGIC Tether Experiment 3/10/2021 Base Plate • . 125 -. 25 in Al 6061 sheet • Note, Current design requires heavy hand construction… It will not fit within the CNC • 4 Aircraft mounting location • 7 handhold, accommodating up to 4 handlers • Experiment restraint harness • Safety cable attachment Colorado Space Grant Consortium & DINO 38

The MAGIC Tether Experiment 3/10/2021 Tool Box • Store bought • Plastic and steel

The MAGIC Tether Experiment 3/10/2021 Tool Box • Store bought • Plastic and steel construction • Round plastic edges • Lockable Colorado Space Grant Consortium & DINO 39

The MAGIC Tether Experiment 3/10/2021 Stand Off • Al 6061 • Industrial strength Velcro

The MAGIC Tether Experiment 3/10/2021 Stand Off • Al 6061 • Industrial strength Velcro • Non permanent attachment • Only for stability, not critical for LD/TO Colorado Space Grant Consortium & DINO 40

The MAGIC Tether Experiment Mechanisms Michael Martinez

The MAGIC Tether Experiment Mechanisms Michael Martinez

The MAGIC Tether Experiment 3/10/2021 Mechanisms • Contents: – Tether Description – Deployment System

The MAGIC Tether Experiment 3/10/2021 Mechanisms • Contents: – Tether Description – Deployment System – Braking System Colorado Space Grant Consortium & DINO 42

The MAGIC Tether Experiment 3/10/2021 Tether Description • • The semi rigid tether (SRT)

The MAGIC Tether Experiment 3/10/2021 Tether Description • • The semi rigid tether (SRT) is constructed of 2 COTS spring metal "tape measures", four feet length by 1 in wide, curved along their width. To be configured ‘face to face’, provides greater stability. Colorado Space Grant Consortium & DINO 43

The MAGIC Tether Experiment 3/10/2021 Deployment System Colorado Space Grant Consortium & DINO 44

The MAGIC Tether Experiment 3/10/2021 Deployment System Colorado Space Grant Consortium & DINO 44

The MAGIC Tether Experiment Deployment System 3/10/2021 (cont) • The MAGIC Tether deployment system

The MAGIC Tether Experiment Deployment System 3/10/2021 (cont) • The MAGIC Tether deployment system consists of two 2. 5 inch spools, geared to counter rotate and unwind the spring metal boom in a controlled manner. Colorado Space Grant Consortium & DINO 45

The MAGIC Tether Experiment Deployment System • 3/10/2021 (cont) Deployment / Braking System –

The MAGIC Tether Experiment Deployment System • 3/10/2021 (cont) Deployment / Braking System – – The stowed SRT will be wound on the two spools such that when deployed the two tape measures will be face to face, forming a rigid structure. Tape to spool connection recessed to reduce stress at connection Colorado Space Grant Consortium & DINO 46

The MAGIC Tether Experiment 3/10/2021 Braking System • Velocity control is provided by a

The MAGIC Tether Experiment 3/10/2021 Braking System • Velocity control is provided by a 48 tooth, 2. 0 inch ratchet and pawl system, with the ratchet shafted to the geared spool, and the pawl spring loaded to provide a loading / braking force against the ratchet. • Initial k for spring ~ 0. 245 N/mm Colorado Space Grant Consortium & DINO 47

The MAGIC Tether Experiment 3/10/2021 Release System • Deployment initiation – Mechanical System –

The MAGIC Tether Experiment 3/10/2021 Release System • Deployment initiation – Mechanical System – Hand held actuating lever • Bicycle brake – Release cable – Switch • Incorporated into handle • Initiates data collection Colorado Space Grant Consortium & DINO 48

The MAGIC Tether Experiment 3/10/2021 Tether Reset Device • Tether reset device • Two

The MAGIC Tether Experiment 3/10/2021 Tether Reset Device • Tether reset device • Two options – Manual crank – Electric drill • Flexible extension used to reach the drive shaft easily • Attached to the toolbox by a steel cable tether Colorado Space Grant Consortium & DINO 49

The MAGIC Tether Experiment 3/10/2021 Tether Mounting • • Deployment / Braking System mounted

The MAGIC Tether Experiment 3/10/2021 Tether Mounting • • Deployment / Braking System mounted in Light Sat (Tip Mass) Boom mounted to Heavy Sat (Main Satellite) with a tether attachment system (TAZ), designed to maintain the rigid natural shape of the tether, while providing a secure attachment. Colorado Space Grant Consortium & DINO 50

The MAGIC Tether Experiment Sensors Kate Worster Michael Seibert

The MAGIC Tether Experiment Sensors Kate Worster Michael Seibert

The MAGIC Tether Experiment 3/10/2021 Sensors: Objectives • The Sensors Subsystem is designed to

The MAGIC Tether Experiment 3/10/2021 Sensors: Objectives • The Sensors Subsystem is designed to measure the large-scale and small-scale dynamics of the experiment during its deployment, including linear and angular accelerations imparted by the tether • Sensors and Data Acquisition – Onboard storage of science and engineering data – Provide data for post-flight analysis Colorado Space Grant Consortium & DINO 52

The MAGIC Tether Experiment 3/10/2021 Sensors & Data Acquisition System Functional Diagram Heavy Side

The MAGIC Tether Experiment 3/10/2021 Sensors & Data Acquisition System Functional Diagram Heavy Side HVY_AZ 15 V HVY_AY HVY_AZ HVY_G 1 HVY_G 2 HVY_G 3 9 V KS Data Logger Kill Switch Data Signal KS Power lines Colorado Space Grant Consortium & DINO 53

The MAGIC Tether Experiment 3/10/2021 Sensors & Data Acquisition System Functional Diagram Light Side

The MAGIC Tether Experiment 3/10/2021 Sensors & Data Acquisition System Functional Diagram Light Side LHT_AZ LHT_AY LHT_AZ LHT_T_D LHT_G 1 LHT_G 2 LHT_G 3 15 V 9 V KS Data Logger Data Signal Power lines Colorado Space Grant Consortium & DINO 54

The MAGIC Tether Experiment 3/10/2021 Functional Requirements Accelerometer Rate Gyro Linear Transducer Data Logger

The MAGIC Tether Experiment 3/10/2021 Functional Requirements Accelerometer Rate Gyro Linear Transducer Data Logger Laptop Measure acceleration Measure twist & rotation Measure spring compression Data acquisition & analysis Colorado Space Grant Consortium & DINO 55

The MAGIC Tether Experiment 3/10/2021 Gyro Specifications-ADXRS 150 EB • Surface-mount package of 7

The MAGIC Tether Experiment 3/10/2021 Gyro Specifications-ADXRS 150 EB • Surface-mount package of 7 mm x 3 mm and mass of 0. 5 grams. • Each rate gyro has a resolution of 0. 05 /s/ Hz and a dynamic range of 150 /s. • Input voltage of 5. 00 v DC from onboard power supply and a quiescent supply current between 6. 0 -8. 0 m. A. Colorado Space Grant Consortium & DINO 56

The MAGIC Tether Experiment 3/10/2021 Accel. Specifications-ADXL 150 • • • Nominal sensitivity: 38.

The MAGIC Tether Experiment 3/10/2021 Accel. Specifications-ADXL 150 • • • Nominal sensitivity: 38. 0 m. V/g and a maximum sensitivity of 43. 0 m. V/g. The functional voltage range 4. 0 V - 6. 0 V and a quiescent supply current of 1. 8 m. A for nominal operation and 3. 0 m. A as the maximum supply current. Resolution: 1. 0 mg/ Hz Dynamic range: 80 d. B Each can withstand 2000 g’s when un-powered and 500 g’s when powered Colorado Space Grant Consortium & DINO 57

The MAGIC Tether Experiment 3/10/2021 9 V Power Supply Specifications 9 V Zn. Mn

The MAGIC Tether Experiment 3/10/2021 9 V Power Supply Specifications 9 V Zn. Mn 2 battery • Average voltage of 9. 0 volts • Average capacity of 655 m. Ahr (0. 8 volts per cell • Weighs 45. 6 grams (1. 6 oz) and has a total volume of 21. 2 cm 3 (1. 3 in 3). Colorado Space Grant Consortium & DINO 58

The MAGIC Tether Experiment 3/10/2021 15 V Power Supply Specifications 1. 5 V Alkaline

The MAGIC Tether Experiment 3/10/2021 15 V Power Supply Specifications 1. 5 V Alkaline Zinc-Manganese Dioxide (Zn. Mn 2) battery • Average voltage of 1. 5 volts • Average capacity of 3135 m. Ahr (0. 8 volts per cell • Weighs 23. 0 grams (0. 8 oz) and has a total volume of 8. 1 cm 3 (0. 5 in 3). Colorado Space Grant Consortium & DINO 59

The MAGIC Tether Experiment 3/10/2021 COTS Parts Status Part Availability Status ADXL 150 In

The MAGIC Tether Experiment 3/10/2021 COTS Parts Status Part Availability Status ADXL 150 In stock on Analog Devices website Not yet ordered ADXRS 150 In stock on Analog Devices website Not yet ordered Inhibits Available at CSGC and JB Saunders Have some, others will be purchasing next week Sensor housing, 18 gauge wire, prototype board Available at JB Saunders Purchasing next week Colorado Space Grant Consortium & DINO 60

The MAGIC Tether Experiment 3/10/2021 Data Collection • Omnidata Polycorder and Data Fielder loggers

The MAGIC Tether Experiment 3/10/2021 Data Collection • Omnidata Polycorder and Data Fielder loggers • 415 K on board storage • 25 Hz sampling rate • Start/Stop trigger capability • 10 analog input channels • 0 V-5 V, 0 V-10 V & 0 V-15 V input ranges Colorado Space Grant Consortium & DINO 61

The MAGIC Tether Experiment 3/10/2021 Data Collection • Heavy Sat – 6 Inputs •

The MAGIC Tether Experiment 3/10/2021 Data Collection • Heavy Sat – 6 Inputs • 3 Accelerometers • 3 Rate Gyroscopes • Light Sat – 7 Inputs • 3 Accelerometers • 3 Rate Gyros • 1 Linear Transducer Colorado Space Grant Consortium & DINO 62

The MAGIC Tether Experiment 3/10/2021 Data Collection • Configuration • Data Retrieval – Omnidata

The MAGIC Tether Experiment 3/10/2021 Data Collection • Configuration • Data Retrieval – Omnidata DF 200 GUI – RS-232 – Variables • Sampling Rate • Saving Rate • Channel Input Voltage Range – Omnidata DF 200 GUI – RS-232 – Data Retrieval Options • Histogram • Spreadsheet Colorado Space Grant Consortium & DINO 63

The MAGIC Tether Experiment 3/10/2021 Ground Support Equipment Requirements • Laptop – RS 232

The MAGIC Tether Experiment 3/10/2021 Ground Support Equipment Requirements • Laptop – RS 232 Capability • Serial Port • USB to Serial adapter • Spring Set Screw Calibration – Calipers • Initial state displacement measurement Colorado Space Grant Consortium & DINO 64

The MAGIC Tether Experiment Procedures Jeff Parker

The MAGIC Tether Experiment Procedures Jeff Parker

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures • • 1. 2. 3. 4. 5.

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures • • 1. 2. 3. 4. 5. 6. 7. Preparations for the First Parabola These procedures must be followed to set the experiment up for the first parabola: Flyer B: verify that the digital video camera is on and working normally. Flyer A: verify that the sensors’ wiring harness is connected to the first data logger on each satellite. Flyer A: turn on power to both satellites by switching the kill switch into the on position. Flyer B: verify that power has been turned on. An LED will indicate normal power for each battery system onboard. Flyer B: replace any battery packs that require replacing. Flyer A: configure each of the two data loggers using a brief set of instructions attached clearly to the equipment containment toolbox. Flyer B: verify every instruction as they are entered. Flyer B: verify the setting of the slow-down mechanism. Flyer B: remove the four cinch straps from the experiment and stow them in the equipment containment toolbox. Flyer A: assist as necessary. This leaves two Velcro straps still attached to the experiment system. Flyers A and B: visually inspect the experiment to make sure that everything is in working order, including the Velcro straps, the safety straps, the deployment system, the safety deployment pin, and the slow-down mechanism. Colorado Space Grant Consortium & DINO 66

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures • Free-Fall minus three minutes 8. Flyer

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures • Free-Fall minus three minutes 8. Flyer A: remove the safety deployment pin and Velcro it to the side of Heavy Sat (it also has a short tether attached to it to restrain it from possibly floating away). 9. Flyer B: check the temperature of the cabin using thermometer attached to the toolbox. 10. Flyer B: record all settings and activities in the logbook. The ambient temperature, air currents, and other environmental factors should be noted. • Free-Fall minus one minute 11. Flyer A: release one of the two remaining Velcro hold-down straps. If the experiment behaves in an unexpected manner, immediately replace the straps and inspect the deployment system. This may sacrifice the parabola, but it could avoid releasing an uncontrolled deployment. 12. Flyer B: prepare the active data logger on each satellite. This requires about eight key-strokes that will be easily visible near the data logger on the system. 13. Flyer A: release the last hold-down Velcro strap (the satellite system still has Velcro attached to its base to keep it still on the base plate). 14. Flyers A and B: situate yourselves such that your feet are restrained by the footrestraints and you are on opposite sides of the flight system. Make sure that Flyer A will be near Heavy Sat and Flyer B will be near Light Sat upon deployment completion. Colorado Space Grant Consortium & DINO 67

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures • Free-Fall 15. Flyers A and B:

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures • Free-Fall 15. Flyers A and B: make sure you are stable in the foot-restraints and prepared for the experiment. 16. Flyers A and B: lift the experiment off of the base plate and maneuver into the correct position over the base plate. During the deployment, the Light Sat will move approximately 2. 5 feet and the Heavy Sat will move approximately 1. 5 feet. Hence it is important to deploy the system in the proper location in space such that the full deployment occurs within the specified experiment volume. This position is marked on the base plate. 17. Flyer A: hold and stabilize the satellite system from the side such that the deployment action will occur sideways and that Flyer A will be near Heavy Sat and Flyer B will be near Light Sat upon deployment completion. 18. Flyer A: take hold of the deployment trigger. 19. Once all personnel are clear from any interference with the MAGIC Tether’s deployment (keeping in mind that both the primary and tip mass systems will move upon deployment), then Flyer A: carefully release the system and trigger the deployment. Keep hold of the deployment trigger, both as a safety and because letting it go might induce added dynamics into the system. 20. The separation springs activate and the deployment proceeds. 21. The tether is reeled out from the Light Sat; accelerometers and rate gyros on both bodies measure the linear and rotational accelerations experienced by both systems; the data are recorded on the data loggers. 22. The slow-down mechanism removes energy from the moving system from the moment of deployment until the system comes to a stop. Colorado Space Grant Consortium & DINO 68

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures 23. 24. 25. 26. 27. • 28.

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures 23. 24. 25. 26. 27. • 28. 29. 30. The Light Sat either comes to a halt with respect to the Heavy Sat or it recoils after the tether stretches taut. Flyer B records the resulting dynamics in the logbook. Flyer B then records the distance that the tether deployed by observing the tic marks on the tether. The maximum separation velocity between the two bodies is 1. 7 ft/s, slow enough to grapple if need be. Therefore, if any recoil action exists that appears to threaten a collision between the two satellites, then Flyer A: carefully grapple the two satellites prior to impact. If, however unlikely, the system recoils at an unexpectedly high velocity, then Flyer A: remain in a safe position and wait until the system settles down before retrieving the hardware. If not otherwise retrieved, Flyer A: take hold of the Heavy Sat. Flyer B: take hold of the Light Sat. Flyer A: place the Heavy Sat onto the Velcro swath on the base plate to secure it before the end of the free-fall. End of Free-Fall Flyer B: keep hold of the Light Sat while the aircraft’s accelerations increase. Flyer A: use the tether-reset device to recoil the tether onto the spools. Flyer B: mate the Light Sat onto the Heavy Sat, compressing the separation springs. The deployment device will not allow the springs to release until triggered, so there is no danger of accidental deployment during this phase. Colorado Space Grant Consortium & DINO 69

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures 31. 32. 33. 34. 35. 36. •

The MAGIC Tether Experiment 3/10/2021 In-Flight Procedures 31. 32. 33. 34. 35. 36. • 37. 38. 39. 40. 41. 42. Flyer A: strap the system down using the two Velcro hold-down straps. Flyer B: command the two active data loggers to stop recording data. Flyer B: adjust the knob on the slow-down mechanism to set the slow-down spring to the next desired value of x 0. Flyer A: verify the set value. Flyer B: record all dynamics, activities, and new settings in the logbook. The ambient temperature, air currents, and other environmental factors should be noted. Flyers A and B: while waiting for the next free-fall, visually inspect the system for signs of fatigue, failures, or damage. If power sensors indicate a battery pack low on power, replace the battery pack at this time. If a data logger is nearing memory capacity, then switch the power and data cables from the active data logger to the spare data logger. Follow the startup procedure listed in line 4. Return to step 11 and repeat. End of Flight Flyer A: place the deployment safety pin into the deployment system. Flyer A: secure all four additional cinch straps on the system. Flyer B: shut the data loggers down following the simple procedures listed on the side of the structure. Flyer B: flip the kill switch on each satellite, turning off power to each system. Flyer A and B: verify that all straps are in place and secure. Flyer A and B: verify that all components are stowed and secure. Colorado Space Grant Consortium & DINO 70

The MAGIC Tether Experiment 3/10/2021 Emergency Procedures • In the event of an emergency,

The MAGIC Tether Experiment 3/10/2021 Emergency Procedures • In the event of an emergency, the following procedures will be followed. These procedures will be posted directly on the experiment, detailing exactly how to shut the system down quickly. 1. If either satellite is not strapped to the base plate, follow the appropriate procedures here: • • • Flyer A: take hold of the Heavy Sat Flyer B: take hold of the Light Sat Flyer A: place the Heavy Sat on the base plate Flyer B: mate the Light Sat on the Heavy Sat Flyer A: strap the system down using the two Velcro straps 2. Switch the master kill switch on each satellite to shut off all power on each satellite. 3. Shut off the power to the data loggers. Colorado Space Grant Consortium & DINO 71

The MAGIC Tether Experiment 3/10/2021 Safety • Restraint Straps – Four cinch straps to

The MAGIC Tether Experiment 3/10/2021 Safety • Restraint Straps – Four cinch straps to hold satellite to base plate during Takeoff/landing – Two Velcro straps for satellite securing during flight – Velcro connection between Heavy Sat and base plate during flight • Safety straps – 20’ straps connected from the base plate to each satellite – 6’ strap connecting each satellite – Braided steel rated to 1000 lbs. • Safety pin – Prevent accidental deployment • • Padding on all metal edges Four handholds per satellite Safety straps attached to all tools Fuses installed on electrical lines Colorado Space Grant Consortium & DINO 72

The MAGIC Tether Experiment Data Analysis Jeff Parker

The MAGIC Tether Experiment Data Analysis Jeff Parker

The MAGIC Tether Experiment 3/10/2021 Data Types • There will be four sources of

The MAGIC Tether Experiment 3/10/2021 Data Types • There will be four sources of data in the MAGIC Tether Experiment: – Qualitative observations by the flyers and by the digital video camera – Quantitative measurements of acceleration by the six single-axis accelerometers – Quantitative measurements of angular velocities by the six single-axis gyroscopes – Quantitative measurements of braking spring compression by the linear transducer Colorado Space Grant Consortium & DINO 74

The MAGIC Tether Experiment 3/10/2021 Data Reduction • Accelerometers and rate gyros have biases

The MAGIC Tether Experiment 3/10/2021 Data Reduction • Accelerometers and rate gyros have biases and scale factors – Calibrated by temperature measurements and specific calibration measurements • Analog measurements between 0 – 5 Volts • Expected Dynamics: – Large acceleration spike at beginning of deployment – Diminishing decelerations until end of tether or all energy is dissipated – Possible dynamics due to tether’s deployment – Possible recoil dynamics due to excessive energy Colorado Space Grant Consortium & DINO 75

The MAGIC Tether Experiment 3/10/2021 Expected Results • The MAGIC Tether team expects the

The MAGIC Tether Experiment 3/10/2021 Expected Results • The MAGIC Tether team expects the following things: – Four standard springs will accelerate the relative velocity of the tip mass with respect to the primary satellite to approximately 1. 7 ft/s (0. 518 m/s). – The tip-off rate of the deployment to be less than 1°/s in each axis. – Given a deployment velocity of 1. 7 ft/s, the optimal value of x 0 to be approximately 0. 66” to critically damp the system’s motion as the tether is fully deployed. – The semi-rigid tape to be deployed in a controlled fashion without any recoil at the end of its deployment. Colorado Space Grant Consortium & DINO 76