Human Engineering Evaluation of Street Cleaners’ MSDs Symptoms

Reason of subject selection The aim of project Survey from Street cleaners about MSDs Posture analysis of RULA Improvements Gantt chart Q & A

Reason for subject selection  Street cleaners work in a poor environment and they have MSDs symptoms because of repetitive work, rack of tools and work overload.  We will analyze the posture and will suggest how to reduce MSDs symptoms.

 Human Engineering Evaluation of Street Cleaners’ MSDs Symptoms  Way to reduce overloading of the amount of work  Preventive management of MSDs

About MSDs M usculoskeletal disorders (MSDs) are injuries or pain in the body's joints, ligaments, muscles, nerves, tendons, and structures that support limbs, neck and back. MSDs can arise from a sudden exertion, or they can arise from making the same motions repeatedly repetitive strain, or from repeated exposure to force, vibr ation, or awkward posture. E xamples carpal tunnel syndrome Low back pain Tension Neck Syndrome

Survey from street cleaners Place : Seoul Ages : All ages Respondents : Street cleaners from Seoul Total : 299

Survey from street cleaners Ages Years of service The highest ratio group of ages are 50s by 51%, people who have been working for 10years are 62%

Survey from street cleaners More than half of workers have physical pain.

Survey from street cleaners

Posture analysis of RULA

Table A An action of picking garbage up upper arm lower arm wrist posture score 1234 wrist twist Score A

Table B unbalanced posture : +2points Neck posture score trunk posture score legs Score B An action of picking garbage up

Table C Score C Score D Score B (6) + Muscle (1) + Force (0) = Score D (7) Score A (4) + Muscle (1) + Force (0) = Score C (5) Grand Score (7) =Action Level 4

Total RULA System Wrist twist Wrist Lower arm Upper arm Legs Trunk Neck A B Muscular use Power Score C = = Posture score by using graph A Power Use score Action level Score D Muscular use Posture score by using graph B Posture score by using graph C

Action level # The requirements for action into which the grand scores are divided is summarized into Action levels as follows. Action level 1 : A score of 1 or 2 indicates that posture is acceptable If it is not maintained or repeated for long periods. Action level 2 : A score of 3 or 4 indicates that further investigation is needed and changes may be required. Action level 3 : A score of 5 or 6 indicates that investigation and changes are required soon. Action level 4 : A score of 7 indicates that investigation and changes are required immediately. Need to improve

Improvements

Improvement - 1

Neck posture score trunk posture score legs Improved score B

Improvement Score C Score D Score B (3) + Muscle (1) + Force (0) = Score D (4) Score A (4) + Muscle (1) + Force (0) = Score C (5) Improved grand Score (4) =Action Level 2

Improvement – 2

Improvement - 3

Improvement - 4

Gantt chart 1주1주 2주2주 3주3주 4주4주 5주5주 6주6주 7주7주 8주8주 9주9주 10 주 11 주 12 주 13 주 14 주 Organizing team Theme selection Symptom Survey on MSDs work measurement interim report Data analysis and evaluation Improvement Final report