Applied precision design llc concept design review biomedical orbital mixer
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Applied Precision Design, LLC Concept Design Review BioMedical Orbital Mixer. Amir Torkaman Applied Precision Design, LLC 1755 East Bayshore Rd. Suite 9B Redwood City, CA 94063 Phone: (650) 387-7902 Fax: (650) 493-1195 www.AprecisionDesign.com. Typical Design Cycle: Biomedical Orbital Mixer.

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Applied Precision Design, LLC Concept Design Review BioMedical Orbital Mixer

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Applied precision design llc concept design review biomedical orbital mixer

Applied Precision Design, LLCConcept Design ReviewBioMedicalOrbital Mixer

Amir TorkamanApplied Precision Design, LLC1755 East Bayshore Rd. Suite 9BRedwood City, CA 94063Phone: (650) 387-7902Fax: (650) 493-1195www.AprecisionDesign.com


Typical design cycle biomedical orbital mixer

Typical Design Cycle: Biomedical Orbital Mixer

VIDEO


Simplified energy model energy entering system

L

T

Simplified Energy Model: Energy Entering System

CONSERVATION OF ENERGY:

Two Modes of Operation:

  • Cranking Cycle: Energy In = Energy Stored into System

  • Operating Cycle: Energy Stored = Work Done By System

Energy Into System

Work Done By System

Internal energy (stored)

Energy Into the System:

Energy Into System = Human Power

Work = Τ∆Θ

example: T = 2.25Nm

L = 75mm

∆Θ = 30 Turns X 2Π = 188.4 rad

W = 423.9 J

Independent of Crank Time or Speed (30 sec)


Simplified energy model energy stored

K

m

Simplified Energy Model: Energy Stored

CONSERVATION OF ENERGY:

L

T

Energy Into System

Work Done By System

Internal energy

W

I

Energy Stored in the System:

Total Energy = Potential + Kinetic Energy

Kinetic Energy = ½ Iw^2Potential = m.g.∆h Spring = ½ K ∆Θ^2

m = 5 grams (x4)m = 5 grams (x4)k ~ 23 N-mm / rad

d = 50mmg= 9.8 m/sec^2 ∆Θ = turns x 2Π

I = 50e-6 Kg/m^2 ∆h = 30mmSpring E = varies with time

Kinetic E = 0.88 J Potential E = 0.005 J


Simplified energy model energy leaving system

L

T

D (drag)

W

I

F (friction)

K

m

Simplified Energy Model: Energy Leaving System

Drag Force =

C ~ 0.8

A = .0012 m^2

V = 9.4 m/sec

F = .05 N (drag force)

Drag Energy = 363 Joules

Energy Out of the System:

Total Work = Frictional Losses + Drag

Frictional Losses = Σ (ζ.E + μ.N.d.∆Θ)

ζ = 3-5 % (gear efficiency)

μ = 0.2 (sliding bearing friction)

Total Energy Loss ~ 80 Joules


Critical design parameters

Critical Design Parameters

V = r.W

Power In = Work / Time = 1.90 Watts (after frictional losses)

Drag Power = = 2.02 Watts

Centripetal Acceleration = r.W^2 (120g’s)

g1

m

r

Drag Power ~ r^3

Acceleration ~ r

Minimize Distance To Center of Mass (r)

EXPERIMENTS

  • Increase Air Resistance

    (Thru addition of a thin sheet metal foil)

    Significant reduction in final velocity

  • Increase Mass 5g  10g

    (Same max speed / took longer to get to speed

  • Increase Mass 5g –> 15g

    (no change in Steady-State conditions)

     vibration and rattling, more force on bearings

  • Reduce # of Cartridges

  • Increase of Cartridge Length

Air Drag Coefficient < 0.4

Use Rolling Bearing μ< 0.01

Reduce # of Gears / Belts / & provide Good Alignment

Reduce Moving Mass / Inertia

Improve Gear Efficiency Thru Lubrication ζ < 3%

Critical Design Parameters


Mixer design

Mixer Design

  • Design Goals

    • Top loading

    • Cartridge top twist in holder

    • Low power loss

      • Ball bearings

      • Minimize CG dia.

    • Mixer: 2mm orbital diameter

    • Centrifuge: 1800 RPM


Comparison concept 1 concept 2

COMPARISON CONCEPT 1 - CONCEPT 2

CONCEPT 2: Combined Mixer / Centrifuge

  • + REDUCES OVERALL BOX LENGTH FROM 15.75 TO 14.5

  • - REQUIRES CLUTCH AND BRAKE TO STOP MOTION OF SPINNER WHILE MIXING

  • - INTERFERENCE IF CARTRIDGES ARE NOT REMOVED FROM NON-USED MECANISM

CONCEPT 1: Separate Mechanisms

  • + SEPARATE MECHANISMS SIMPLIFY DRIVE

  • + EASY ACCESS TO CARTRIDGES

  • - SEPARATE SHAFT AND SUPPORT

  • - TWO ENCLOSURES REQUIRED


Concept 1 concentric mixer spinner

CONCEPT 1CONCENTRIC MIXER/SPINNER


Applied precision design llc concept design review biomedical orbital mixer

CONCEPT 1CONCENTRIC MIXER/SPINNER

PINS IN SLOTS GUIDED IN SLOTS OF POLYMER BEARING


Concept 2 separate mixer spinner assembly top view

CONCEPT 2SEPARATE MIXER/SPINNER ASSEMBLYTOP VIEW

15.75”

9”


Applied precision design llc concept design review biomedical orbital mixer

ECCENTRIC DRIVE

Orbital Mixer Design

ECCENTRIC SHAFT

UPPER BEARINGS

LOWER BEARINGS

TIMING BELT COG


Centrifuge design

Centrifuge Design

  • Design Goals

    • Top loading

    • Low power loss

      • Ball bearings

      • Minimize CG dia.

      • Aerodynamic Holders

    • G1 > 50G

    • G2 ~ 120G

    • G-load axial to cartridge

    • Contain Blood Spill


Concept concentric mixer spinner

CONCEPTCONCENTRIC MIXER/SPINNER


Detal design

DETAL DESIGN


Concept separate mixer spinner assembly

CONCEPT SEPARATE MIXER/SPINNER ASSEMBLY


Typical design cycle biomedical orbital mixer1

Typical Design Cycle: Biomedical Orbital Mixer

VIDEO


Applied precision design llc concept design review biomedical orbital mixer

  • BACK UP SLIDES


Concept separate mixer spinner assembly front view

CONCEPTSEPARATE MIXER/SPINNER ASSEMBLYFRONT VIEW

7.75”


Centrifuge design1

Centrifuge Design

  • Calculated Cartridge G’s


Applied precision design llc concept design review biomedical orbital mixer

CARTRAGE RETAINER

RIBS ON CARTRAGE PREVENT ROTATION SO THAT CAP CAN BE TWISTED IN PLACE


Applied precision design llc concept design review biomedical orbital mixer

CONCEPT 1 - ARM WITH PIN IN SLOT PREVENTS ROTATION

DOES NOT YIELS TRUE ORBITAL MOTION.

  • CARTIRIDGES NEARIST PIN RESTRICTED IN Y MOVEMENT

  • CARTRIDGES AWAY FROM PIN EMPHASIXED IN Y MOVEMENT

PIN IN SLPT

Y

X


Applied precision design llc concept design review biomedical orbital mixer

CONCEPT 2 - SPRING ROTATION PREVENTER

4X SPRING POST

SPRING NOT SHOWN


Comparison of mixer anti rotation devices

COMPARISON OF MIXER ANTI-ROTATION DEVICES

ARM IN SLOT

  • - DOES NOT YIELD TRUE ORBITAL MOTION.

    • CARTIRIDGES NEARIST PIN RESTRICTED IN Y MOVEMENT

    • CARTRIDGES AWAY FROM PIN EMPHASIXED IN Y MOVEMENT

  • + Simple Design

  • - FRICTION

    SPRING

  • - SPRINGS PRONE TO BREAKAGE

  • - UNKNOWN HARMONICS

  • + LOW FRICTION

  • - NOT GOOD WITH CAP TWIST

  • + Simple Design

    SWASH PLATE

  • + ROBUST DESIGN

  • - FRICTION


Mechanical governor with speed indicator

MECHANICAL GOVERNOR WITH SPEED INDICATOR

GOVERNOR


Mechanical governor with speed indicator1

MECHANICAL GOVERNOR WITH SPEED INDICATOR

WITH INDICATOR SIGHT

WITHOUT SIGHT

CORRECT SPEED

OVER SPEED


Electronic governor

ELECTRONIC GOVERNOR

GENERATOR


Comparison of governors

COMPARISON OF GOVERNORS

MECHANICAL GOVERNOR

  • - MULTIPLE MOVING PARTS

  • - DIFICULT TO CALIBRATE

  • - INDICATOR APPROXIMATE

  • - DRAG DEPENDENT UPON WIND RESISTANCE

    ELECTRICAL GOVERNOR

  • +/- POSSIBLY COUPLED WITH RECHARGABLE BATTERY TO INDICATE CRANK WIND

  • + ELECTRIC SPEED INDICATOR

  • + GOOD GOVERNOR SPEED CONTROL

  • - ADDITION OF MULTIPLE ELECTRICAL COMPONENTS

  • - COST OF GENERATOR & CIRCUIT BOARD

    NO GOVERNOR – CENTRIFUGE ACTS AS FLYWHEEL

  • + ELIMINATES MECHANISN

  • - DIFFICULT TO BALANCE/CALIBRATE

  • - NO INDICATOR


3 minute rotation stop

3 MINUTE ROTATION STOP

PUSH ROD TO RELEASE

SPRING LOADED CATCH LEVER

GEAR REDUCTION STACK

INPUT SPROKET


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