Ergonomics and Human Factors

Why it matters

Ergonomics and Human Factors are crucial in industrial engineering as they enhance worker productivity, safety, and comfort. By designing systems that align with human capabilities and limitations, industries can reduce errors, increase efficiency, and improve job satisfaction.

Key ideas

• Ergonomics: The science of designing the workplace, keeping in mind the capabilities and limitations of the worker.
• Human Factors: Focuses on the interaction between humans and systems, aiming to improve performance and safety.
• Anthropometry: The study of human body measurements, crucial for designing tools and workspaces.
• Cognitive Ergonomics: Deals with mental processes such as perception, memory, and reasoning, and how they affect interactions with systems.
• Physical Ergonomics: Concerned with human anatomical, anthropometric, physiological, and biomechanical characteristics as they relate to physical activity.
• Organizational Ergonomics: Focuses on optimizing socio-technical systems, including organizational structures, policies, and processes.

Assessment method

RULA (Rapid Upper Limb Assessment) is a table-based screening method, not a sum or product of posture scores. Score the arm/wrist group and the neck/trunk/leg group, apply the worksheet adjustments for muscle use and force/load, then combine the group scores using Table C. The final score ranges from 1 to 7.

Worked example

A draft calculation adds upper-arm 3, lower-arm 2, wrist 2 and wrist-twist 1, then reports 8. This is invalid: these scores must be combined using the worksheet tables, and neck, trunk and leg observations are missing. Therefore a final RULA score cannot be determined from the given information. Complete the observations and use the published worksheet. A final score of 5 or 6 calls for investigation and changes soon; 7 calls for immediate investigation and change.

Reference: Cornell RULA worksheet. RULA supports prioritization; it does not certify a workstation as safe or diagnose an injury.

Common mistakes

• Ignoring the importance of anthropometric data in design.
• Overlooking cognitive ergonomics, leading to systems that are mentally taxing.
• Miscalculating RULA scores by not considering all posture and load factors.

For GATE ME

Questions may involve calculating ergonomic assessment scores, understanding the principles of human factors, and applying anthropometric data in design problems. Practice interpreting ergonomic data and applying it to real-world scenarios.

Quick check

1. What is the primary goal of ergonomics?
2. Name two types of ergonomics.
3. What does RULA stand for?

Answers: 1. To design systems that fit human capabilities and limitations. 2. Cognitive Ergonomics, Physical Ergonomics. 3. Rapid Upper Limb Assessment.