Vibration

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Vibration

  1. 1. ERGONOMIC VIBRATION
  2. 2. WHO’S AT RISK?s ANYONE WHO ABSORBS MACHINE VIBRATION THROUGH THEIR HANDS AND ARMS WHILE WORKING A FAST-MOVING HAND TOOL --s OR THROUGH THE BUTTOCKS AND THE SOLES OF THE FEET WHILE RIDING IN OR STANDING NEAR VIBRATING, HEAVY MACHINERY--s RUNS THE RISK.
  3. 3. WHAT IS VIBRATION? s VASOSPASTIC, NEUROMUSCULAR, ARTHRITIC DISORDERS OF THE HANDS AND UPPER LIMBS s COMPOSITE OF VIBRATION INDUCED SIGNS AND SYMPTOMS (e.g. NUMBNESS, TINGLING OF THE FINGERS, EPISODIC BLANCHING OF THE FINGERS, PAIN, REDUCED GRIP STRENGTH AND DEXTERITY s RAYNAUD’S SYNDROME, WHITE FINGER
  4. 4. SYMPTOMS OF VIBRATIONSYNDROME?s DISCOMFORT FROM COLDs TINGLING, NUMBINGs BLANCHING FINGERSs PAIN
  5. 5. HOW MANY EXPOSED? s APPROXIMATELY 1.2 MILLION EXPOSED s 50 -- 60 % OF WORKER POPULATION HAVE SYMPTOMS
  6. 6. TYPES? s WHOLE BODY VIBRATION s SEGMENTAL VIBRATION
  7. 7. DEFINITION? s A CYCLE OF SPECIFIC ACTIVITY BACK- FORTH, UP AND DOWN RESULTING FROM REVERSAL OF ENERGY s FREQUENCIES OF 100 HZ OR HIGHER ARE ABSORBED BY THE HANDS AND WRISTS s FREQUENCIES UNDER 100 HZ ARE ABSORBED BY THE UPPER LIMB JOINTS
  8. 8. RESPONSE DEPENDS ON: s FREQUENCY OF VIBRATION s AMPLITUDE OF VIBRATION s TIME HISTORY OF VIBRATION EXPOSURE s DIRECTION OF VIBRATION s POINT OF APPLICATION OF VIBRATION s HOW MUCH VIBRATION IS TRANSMITTED s AFFECT OF CLOTHING AND EQUIPMENT s BODY SIZE (HEIGHT AND WEIGHT) s BODY POSTURE/ BODY TENSION
  9. 9. MAGNITUDE IS INFLUENCEDBY:s TYPE, WEIGHT, AND CONDITION OF TOOLs ACCELERATION AND FREQUENCY PRODUCED BY TOOL • TOOL TYPE, ENVIRONMENTAL, ANTI-VIBRATION MATERIAL • OPERATING SPEED, ERGONOMICS OF USEs GRIPPING FORCESs ORIENTATION AND POSTURE OF THE HANDS, ARMS, AND BODY DURING WORKs PARTS OF HANDS IN DIRECT CONTACT WITH THE VIBRATING SURFACE
  10. 10. TOOLS MOST COMMONLYASSOCIATED:s POWERED HAMMERSs CHISELS, CHAIN SAWSs SANDERS, GRINDERS, RIVETERSs BREAKERS, DRILLS, COMPACTORSs SHARPENERS, SHAPERS
  11. 11. CONTROL STRATEGIES:s ENGINEERING AND WORK PRACTICESs ANTI-VIBRATION CLOTHING, EQUIPMENT, AND TRAININGs GOALS: • REDUCE THE INTENSITY • REDUCE THE EXPOSURE DURATION • IDENTIFY THE EARLY SIGNS AND SYMPTOMS
  12. 12. ENGINEERING CONTROLS: s REDUCTION AT SOURCE s REDUCTION OF TRANSMISSION s PROCESS MODIFICATION
  13. 13. REDUCTION AT SOURCE s REDUCE SPEED OF TOOL s REDUCE WEIGHT AND POWER NEEDED TO DRIVE THE TOOL s CHANGE TYPE OF TOOL • E.G. RECIPROCATING ENGINE TO ROTARY OR ELECTRIC MOTOR s TOOL MAINTENANCE s MOUNT EQUIPMENT ON SPRINGS OR COMPRESSION PADS s USE MATERIALS THAT GENERATE LESS VIBRATION
  14. 14. REDUCTION AT TRANSMISSIONs PROVIDE CUSHION TO ACT AS A VIBRATION ISOLATER IN A SEATED TASKs PROVIDE ANTI-FATIGUE MATS FOR STANDING OPERATIONs DESIGN TOOLS TO REDUCE VIBRATION TRANSMITTED TO THE HANDS,s COUNTERWEIGHT TOOLS TO MINIMIZE GRIPPING REQUIRED TO OPERATE THEM • DAMPENING MATERIALS AND GLOVES ARE USUALLY MORE EFFECTIVE FOR HIGHER FREQUENCIES.
  15. 15. PROCESS MODIFICATIONs CHANGES IN ANY ASPECT OF PROCESS TO ELIMINATE NEED FOR VIBRATING TOOLS OR EQUIPMENTs USING MECHANICAL AIDS (CHUCKS, CLAMPS) TO HOLD MATERIAL • REDUCES TIME OR INTENSITY OF EXPOSUREs ROBOTICSs AUTOMATIONs SUBSTITUTION OF MATERIALS • PLASTICS FOR HARD METAL
  16. 16. WORK MODIFICATIONAPPROACHESs LIMIT NUMBERS OF HOURSs REDUCE NUMBER OF DAYS PER WEEKs ROTATE BETWEEN VIBRATING AND NON- VIBRATING TOOL TASKSs SCHEDULE MAINTENANCE BREAKS
  17. 17. WORK PRACTICESs LENGTH OF WORK DAYs JOB ROTATIONs SELECT LOW VIBRATION TOOLSs DESIGN WORK TASK AND WORKPLACE ERGONOMICALLYs REDUCE GRIP FORCE APPLIEDs REDUCE FORCE APPLIEDs RESTRICT USE OF PIECE WORK AND INCENTIVE PAYs ERGONOMIC WORK POSTURES
  18. 18. ADMINISTRATIVE CONTROLSs PPEs REDUCE TRANSMISSION OF VIBRATING ENERGY TO THE HANDs PROTECT AGAINST EXPOSURE TO COLD AND TRAUMAs TRAINING • SOURCE OF VIBRATION • ADVERSE HEALTH AND SAFETY EFFECTS • EARLY SIGNS AND SYMPTOMS • USE AND AVAILABILITY OF VIBRATION PROTECTIVE CLOTHING • ANTI-VIBRATION DEVICES • VALUE OF GOOD TOOL MAINTENANCE • WORK PRACTICE PROCEDURES

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