제 5~7 주차 강의
 5~7 주차(Design of Work)
 교과서 4장: Manual Work
 교과서 5장: Workplace, Equipment, Tool
 교과서 6장: Work Environment
 1-4주차
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
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
산업공학, 산업 발전 역사, IE 인재의 모습
교과서 1-2장
제조 프로세스
교과서 3장:
 Operation Improvement Check List
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개선 체크 리스트
1.
2.
3.
4.
5.
6.
7.
8.
9.
Operation Purpose
Part Design
Tolerance and Specifications
Material
Manufacture Sequence and Process
Setup and Tools
Material Handling
Plant Layout
Work Design
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PowerPoint to accompany
Methods, Standards, and Work Design
12th Edition
Niebel/Freivalds
3
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Manual Work Design
 The Masculoskeletal System
 Principles of Work Design
 Motion Economy
 Motion Study
 Manual Work and Design Guidelines
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The Masculoskeletal System, Sliding Filament Theory
이두박근,
삼두박근, 상박근,
완요골근,
5
Principles of Work Design
 Achieve Max. Muscle Strength at the
Midrange of Motion
 Achieve Max. Muscle Strength with Slow
Movement
 Use Momentum
 Optimize Human Strength Capability
 Use Large Muscles for Tasks Requiring
Strength
 Stay Below 15 Percent of Max. Force
6
Force – Muscle length Realationship
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Typical Relaxed Posture / Force-Velocity Relationship
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Static Strength Positions / Static Endurance-Exertion Relationship
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Principles of Work Design-계속
 Use Short, Frequent, Intermittent
Work/Rest Cycle
 Design Task so that Most Workers Can Do
 Use Low Force for Precise Movements or
Fine Motor Control
 Do Not Attempt Precise Movement
Immediately after Heavy Work
 Use Ballistic Movement for Speed
 Begin and End Motions with Both Hands
Simultaneously
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성별, 나이에 따른 비 경련 유발 하에서의 근력
11
Principles of Work Design-계속
 Move the Hands Symmetrically and
Simultaneously To and From the Center of
the Body
 Use the Natural Rhythms of the Body
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Filing metal: 60~78 strokes / minute
Chiseling: 60
Arm cranking: 35
Leg cranking: 60~72
 Use Continuous Curved Motions
 Use Lowest Classification of Movement
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Difficulty versus Movement Time by Body Part
•
1.
2.
3.
4.
5.
Motion Class
Finger
1+ Wrist
2+ Lower Arm
4+ Upper Arm
4+ Trunk
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Principles of Work Design-계속
 Work with Both Hands and Feet
Simultaneously
 Minimize Eye Fixation
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Motion Study
 Basic Motions: 17 Therbligs
 Effective: RE, M, G, RL, PP, U, A, DA
 Ineffective: S, SE, P, I, PL, UD, AD, R, H
 Two Hand Process Chart or Operator P.C.
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Manual Work Design Guidelines
 Energy Expenditure and Supply
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Energy Costs: 5.33 kcal/min recommended for 8h workday
1.33 kcal/min is energy expenditure during rest
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Heart Rate Guidelines for Energy Expenditure
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Heart Rate Guidelines for Energy Expenditure
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Low Back Compressive Forces
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디스크 :
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분석 모형의 예
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NIOSH Lifting Guidelines
National Institute for
Occupational Safety and
Health
• Type of Life
• Single
• Multiple
• Frequency
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General Guidelines for Lifting
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Principles of Work Design