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Ergonomic design:
Grass weed cutter
RAMZIYA ASHARAF
Roll no: 16, S1 IEM 2019
CASE STUDY : To conduct anthropometric study of
the working condition of grass weed cutting
labour using the weed cutting machine.
PROBLEM STATEMENT:
The person who works behind the Grass weed cutting
machine is exposed to high vibration and the standing
wrong working posture can invite several physical
problems.
HEALTH HAZARDS
• Muscle pains in legs, back and
neck.
• Stiffness in necks and shoulders.
• Motion sickness.
• Sore feet.
• Varicose veins.
• Muscular fatigue.
• Reduction of blood supply to
loaded muscles.
• Immobilization of joints in
spines, hip, knees and feet.
• Bone damage.
• Stomach and digestive
conditions;
• respiratory, endocrine and
metabolic changes
POSTURE DURING GRASS WEED
CUTTING
RULA ANALYSIS
Arm and Wrist Analysis
Upper Arm Score +2
Lower Arm Score +1
Wrist Score +2
Wrist Twist +1
Posture Score A +3
Muscle Score +1
Force / Load Score +3
Wrist and Arm Score 7
Neck , Trunk and Leg Analysis
Neck Score +3
Trunk Score +4
Leg Score +2
Posture Score B 5
Muscle Score +1
Force / Load Score +3
Neck , Trunk and Leg Score 9
RULA Score 7
POSTURE ANALYSIS RESULT
• If for a task RULA score is greater than 6, then there will be a very
high level of risk and calls for immediate attention
• For the task RULA score is 6+ (i.e., 7) which produces very high
level of MSD (musculoskeletal disorders) risk.
A TYPICAL VIEW OF A PERSON WHO IS USING REDESIGNED
GRASS CUTTING
REMEDIES:
• Ergonomic flexible anthropometric design of grass weed cutting
equipment.
• Reduced vibration by using alternative source for rotating cutting
blades like using motors powered by electric source other than
using an reciprocating engine to rotate the blade.
• Adjustable length of grass cutters extended pipe
• Follow good working posture which is having low MSD risk level.
• Reduction of weight of the equipment.
• Frequent rest period.
• Adjustable handle.
THANK YOU..

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Ergonomic design: Grass weed cutter, a Case study

  • 1. Ergonomic design: Grass weed cutter RAMZIYA ASHARAF Roll no: 16, S1 IEM 2019
  • 2. CASE STUDY : To conduct anthropometric study of the working condition of grass weed cutting labour using the weed cutting machine. PROBLEM STATEMENT: The person who works behind the Grass weed cutting machine is exposed to high vibration and the standing wrong working posture can invite several physical problems.
  • 3. HEALTH HAZARDS • Muscle pains in legs, back and neck. • Stiffness in necks and shoulders. • Motion sickness. • Sore feet. • Varicose veins. • Muscular fatigue. • Reduction of blood supply to loaded muscles. • Immobilization of joints in spines, hip, knees and feet. • Bone damage. • Stomach and digestive conditions; • respiratory, endocrine and metabolic changes
  • 4. POSTURE DURING GRASS WEED CUTTING
  • 5. RULA ANALYSIS Arm and Wrist Analysis Upper Arm Score +2 Lower Arm Score +1 Wrist Score +2 Wrist Twist +1 Posture Score A +3 Muscle Score +1 Force / Load Score +3 Wrist and Arm Score 7 Neck , Trunk and Leg Analysis Neck Score +3 Trunk Score +4 Leg Score +2 Posture Score B 5 Muscle Score +1 Force / Load Score +3 Neck , Trunk and Leg Score 9 RULA Score 7
  • 6. POSTURE ANALYSIS RESULT • If for a task RULA score is greater than 6, then there will be a very high level of risk and calls for immediate attention • For the task RULA score is 6+ (i.e., 7) which produces very high level of MSD (musculoskeletal disorders) risk.
  • 7. A TYPICAL VIEW OF A PERSON WHO IS USING REDESIGNED GRASS CUTTING
  • 8. REMEDIES: • Ergonomic flexible anthropometric design of grass weed cutting equipment. • Reduced vibration by using alternative source for rotating cutting blades like using motors powered by electric source other than using an reciprocating engine to rotate the blade. • Adjustable length of grass cutters extended pipe • Follow good working posture which is having low MSD risk level. • Reduction of weight of the equipment. • Frequent rest period. • Adjustable handle.