The ridft analysis
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THE RIDFT :analysis. Presented By: Daniel Escobedo Chelsea Armbrister Divyesh Bhakta Brian LaTulip Luis Sura Joseph Gwaltney. Advisors : Dr. Okenwa Okoli Dr. Peter N. Kalu tarik Dickens . Introduction . RIDFT PROCESS . Past Design.

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THE RIDFT :analysis

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The ridft analysis

THE RIDFT :analysis

Presented By:

Daniel Escobedo Chelsea Armbrister

DivyeshBhakta

Brian LaTulip

Luis Sura Joseph Gwaltney

Advisors: Dr. OkenwaOkoli

Dr. Peter N. Kalu

tarik Dickens


Introduction

Introduction

RIDFT PROCESS


Past design

Past Design

  • Symmetric mirror image hydraulic linkage systems

  • .75 Hp DC motor driven

  • 4 -10” stroke hydraulic cylinders

  • Gear and pinion pair (50T, 40T)


Design issues

Design Issues

  • Total Cost -$14,000

    • Bulk metal and custom gears

  • Safety

    • Failure to meet OSHA standards

    • Failure in hydraulics and materials not prevented

  • Floor Space

    • Too much “real estate” taken up


Re definition

RE DEFINITION

Voice of Customer


Safety

SAFETY

RULA- Ergonomic Tool used to

Measure Safety

of a process


Rula for present ridft

RULA for present Ridft

Arm & Wrist

Neck, Trunk, & Legs

5

Upper arm

Lower arm

Wrist pos.

Wrist Twist

Final Score

3

Neck pos.

Trunk pos.

Legs

2

4

7

3

1

1

6

5

Posture score

Posture Score

0

9

8

0

Muscle use

Muscle use

Row score

Column score

3

3

Force/load

Force/load


Theoretical rula for previous concept

Theoretical RULA for previous concept

Arm & Wrist

Neck, Trunk, & Legs

3

Upper arm

Lower arm

Wrist pos.

Wrist Twist

Final Score

1

Neck pos.

Trunk pos.

Legs

2

2

3

1

1

1

2

4

Posture score

Posture Score

0

4

2

0

Muscle use

Muscle use

Row score

Column score

0

0

Force/load

Force/load


Expected rula for present concept

expected RULA for present concept

Arm & Wrist

Neck, Trunk, & Legs

3

Upper arm

Lower arm

Wrist pos.

Wrist Twist

Final Score

1

Neck pos.

Trunk pos.

Legs

1

2

4

1

1

1

3

2

Posture score

Posture Score

0

6

2

0

Muscle use

Muscle use

Row score

Column score

3

0

Force/load

Force/load


The ridft analysis

OSHA

Statistical data


Ergonomic arm analysis current ridft

ERGONOMIC ARM ANALYSIS Current Ridft

  • ∑Fy = 0Ry + FB -.02W - FD = 0

  • ∑MA = 0FB(BC) -.02W(BD) - FD(BE)

    FBicep = 353.3 lb Ry = 325.3 lb


Ergonomic bending lifting and carrying analysis

ERGONOMIC BENDING,LIFTING, AND CARRYING ANALYSIS

∑Fx = 0

Rx - Fex = 0; Rx - Fecos(-) = 0

Rx = 626.4lb

∑Fy = 0

Ry - .36W – (.18W+WL) – Fey = 0

Ry - .36W – (.18W+WL) - Fesin (-) = 0

Ry= -735.3 lb (Downward action)

∑MA = 0

-.36W(AB)cos() – (.18W+WL)(AD)cos()- Fey(AC)cos()+

Fex(AC)sin()

Fe = (289.1/10.191) = 870.1lb ( Extensor Muscle Force)


Theoretical ergonomic analysis

Theoretical Ergonomic Analysis


Concept generation

Concept Generation

  • Pros

    • Ergonomically viable lift

    • Portable table lift

  • Cons

    • Lack of Safety Constraints

      • Coil susceptible to brittle fracture

    • Expensive

      • Short coil life


Concept generation cont

Concept Generation (Cont.)

  • Pros

    • Portable (Swivel Wheels)

    • Adjustable Safety Lock

    • Sturdy

  • Cons

    • No manner of precise placement

    • Two Man Operation


The trolley

The Trolley


Conclusion

Conclusion

  • problem was redefined

  • new design must be assembled to meet project aims

  • Next phase : DESIGN


Questions

Questions


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