Enviar búsqueda
Cargar
Human vibration
•
0 recomendaciones
•
532 vistas
Clean Agent Sdn Bhd
Seguir
Denunciar
Compartir
Denunciar
Compartir
1 de 4
Descargar ahora
Descargar para leer sin conexión
Recomendados
Vibration hazards - OH & S
Vibration hazards - OH & S
Jignesh Raiyani
Isom Havs 23.03.07
Isom Havs 23.03.07
Peter Noone
Sensation augmentation to relieve pressure sore formation in wheelchair users
Sensation augmentation to relieve pressure sore formation in wheelchair users
kix65939
Noise and Vibration hazards
Noise and Vibration hazards
wasim shah
Advice for employees hand arm vibration
Advice for employees hand arm vibration
Project Sales Corp
EFFECT OF HAND ARM VIBRATION EXPOSURE IN MANUFACTURING INDUSTRY
EFFECT OF HAND ARM VIBRATION EXPOSURE IN MANUFACTURING INDUSTRY
IAEME Publication
Shubham 1
Shubham 1
Vikas Semwal
24 noise vibration and occupational medicine
24 noise vibration and occupational medicine
Jasmine John
Recomendados
Vibration hazards - OH & S
Vibration hazards - OH & S
Jignesh Raiyani
Isom Havs 23.03.07
Isom Havs 23.03.07
Peter Noone
Sensation augmentation to relieve pressure sore formation in wheelchair users
Sensation augmentation to relieve pressure sore formation in wheelchair users
kix65939
Noise and Vibration hazards
Noise and Vibration hazards
wasim shah
Advice for employees hand arm vibration
Advice for employees hand arm vibration
Project Sales Corp
EFFECT OF HAND ARM VIBRATION EXPOSURE IN MANUFACTURING INDUSTRY
EFFECT OF HAND ARM VIBRATION EXPOSURE IN MANUFACTURING INDUSTRY
IAEME Publication
Shubham 1
Shubham 1
Vikas Semwal
24 noise vibration and occupational medicine
24 noise vibration and occupational medicine
Jasmine John
VIBRATION.pptx
VIBRATION.pptx
RayjivThevendram2
CS_Project-_HAVS[1]-1 (1).pptx
CS_Project-_HAVS[1]-1 (1).pptx
KUNDESHWARPUNDALIK
Assesment of Noise & Vibration: An Impact on Humans
Assesment of Noise & Vibration: An Impact on Humans
Rahul Valath
Vibration
Vibration
Dr. Sanjib Kumar Das
Hand tools
Hand tools
Clean Agent Sdn Bhd
Hand arm vibration
Hand arm vibration
doogstone
Hand Arm Vibration Syndrome
Hand Arm Vibration Syndrome
Eneutron
Analysis of Muscles and gripping Activities of human Hand During drilling o...
Analysis of Muscles and gripping Activities of human Hand During drilling o...
Mohammed H Alaqad
Swiss dolorclast applications for podiatrty
Swiss dolorclast applications for podiatrty
pripper
Hand Arm Vibration
Hand Arm Vibration
DjCurrie
Introduction to ultrasound & regional anesthesia
Introduction to ultrasound & regional anesthesia
Saad Al-Shamma
repetetive strain injury
repetetive strain injury
Aakash jainth
Noise and Vibrations
Noise and Vibrations
Lorea Fashionwear Lorea Fabrics Printing
Interrupted Direct Current
Interrupted Direct Current
xynabnoor
123 Work related MSD Work related MSD.ppt
123 Work related MSD Work related MSD.ppt
Abdelrhman abooda
Work related MSD.ppt
Work related MSD.ppt
TrainingODHROD
Vibration analysis unit1
Vibration analysis unit1
Dibyendu De
Us physics (4)
Us physics (4)
KamalEldirawi
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
NimonaAAyele
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
ShambelDebele
Finishing equipments
Finishing equipments
Clean Agent Sdn Bhd
Color theory
Color theory
Clean Agent Sdn Bhd
Más contenido relacionado
Similar a Human vibration
VIBRATION.pptx
VIBRATION.pptx
RayjivThevendram2
CS_Project-_HAVS[1]-1 (1).pptx
CS_Project-_HAVS[1]-1 (1).pptx
KUNDESHWARPUNDALIK
Assesment of Noise & Vibration: An Impact on Humans
Assesment of Noise & Vibration: An Impact on Humans
Rahul Valath
Vibration
Vibration
Dr. Sanjib Kumar Das
Hand tools
Hand tools
Clean Agent Sdn Bhd
Hand arm vibration
Hand arm vibration
doogstone
Hand Arm Vibration Syndrome
Hand Arm Vibration Syndrome
Eneutron
Analysis of Muscles and gripping Activities of human Hand During drilling o...
Analysis of Muscles and gripping Activities of human Hand During drilling o...
Mohammed H Alaqad
Swiss dolorclast applications for podiatrty
Swiss dolorclast applications for podiatrty
pripper
Hand Arm Vibration
Hand Arm Vibration
DjCurrie
Introduction to ultrasound & regional anesthesia
Introduction to ultrasound & regional anesthesia
Saad Al-Shamma
repetetive strain injury
repetetive strain injury
Aakash jainth
Noise and Vibrations
Noise and Vibrations
Lorea Fashionwear Lorea Fabrics Printing
Interrupted Direct Current
Interrupted Direct Current
xynabnoor
123 Work related MSD Work related MSD.ppt
123 Work related MSD Work related MSD.ppt
Abdelrhman abooda
Work related MSD.ppt
Work related MSD.ppt
TrainingODHROD
Vibration analysis unit1
Vibration analysis unit1
Dibyendu De
Us physics (4)
Us physics (4)
KamalEldirawi
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
NimonaAAyele
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
ShambelDebele
Similar a Human vibration
(20)
VIBRATION.pptx
VIBRATION.pptx
CS_Project-_HAVS[1]-1 (1).pptx
CS_Project-_HAVS[1]-1 (1).pptx
Assesment of Noise & Vibration: An Impact on Humans
Assesment of Noise & Vibration: An Impact on Humans
Vibration
Vibration
Hand tools
Hand tools
Hand arm vibration
Hand arm vibration
Hand Arm Vibration Syndrome
Hand Arm Vibration Syndrome
Analysis of Muscles and gripping Activities of human Hand During drilling o...
Analysis of Muscles and gripping Activities of human Hand During drilling o...
Swiss dolorclast applications for podiatrty
Swiss dolorclast applications for podiatrty
Hand Arm Vibration
Hand Arm Vibration
Introduction to ultrasound & regional anesthesia
Introduction to ultrasound & regional anesthesia
repetetive strain injury
repetetive strain injury
Noise and Vibrations
Noise and Vibrations
Interrupted Direct Current
Interrupted Direct Current
123 Work related MSD Work related MSD.ppt
123 Work related MSD Work related MSD.ppt
Work related MSD.ppt
Work related MSD.ppt
Vibration analysis unit1
Vibration analysis unit1
Us physics (4)
Us physics (4)
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
4. CNS Spinal cord injury.pptx
Más de Clean Agent Sdn Bhd
Finishing equipments
Finishing equipments
Clean Agent Sdn Bhd
Color theory
Color theory
Clean Agent Sdn Bhd
Board measure
Board measure
Clean Agent Sdn Bhd
Wood guide
Wood guide
Clean Agent Sdn Bhd
Weight children
Weight children
Clean Agent Sdn Bhd
Utff color
Utff color
Clean Agent Sdn Bhd
Systems
Systems
Clean Agent Sdn Bhd
Pattern
Pattern
Clean Agent Sdn Bhd
Memory
Memory
Clean Agent Sdn Bhd
Lifting
Lifting
Clean Agent Sdn Bhd
Lifting & arm vibration
Lifting & arm vibration
Clean Agent Sdn Bhd
Hip
Hip
Clean Agent Sdn Bhd
Handarm
Handarm
Clean Agent Sdn Bhd
Grips
Grips
Clean Agent Sdn Bhd
Ergonomicsorigins
Ergonomicsorigins
Clean Agent Sdn Bhd
Ergonomics
Ergonomics
Clean Agent Sdn Bhd
Ergo chair
Ergo chair
Clean Agent Sdn Bhd
Ergo primer
Ergo primer
Clean Agent Sdn Bhd
Controls
Controls
Clean Agent Sdn Bhd
Compatibility
Compatibility
Clean Agent Sdn Bhd
Más de Clean Agent Sdn Bhd
(20)
Finishing equipments
Finishing equipments
Color theory
Color theory
Board measure
Board measure
Wood guide
Wood guide
Weight children
Weight children
Utff color
Utff color
Systems
Systems
Pattern
Pattern
Memory
Memory
Lifting
Lifting
Lifting & arm vibration
Lifting & arm vibration
Hip
Hip
Handarm
Handarm
Grips
Grips
Ergonomicsorigins
Ergonomicsorigins
Ergonomics
Ergonomics
Ergo chair
Ergo chair
Ergo primer
Ergo primer
Controls
Controls
Compatibility
Compatibility
Human vibration
1.
©Professor Alan Hedge,
Cornell University, November 2001 Human Vibration DEA 325/651 Professor Alan Hedge Vibration Issues • Whole body vibration – Human performance effects – Motion sickness • Segmental vibration – Vibration of one or more parts of the body Definitions • Frequency of the vibration (cycles/second) measured in Hertz (Hz) • Intensity of vibration measured in: – Amplitude/displacement (cm or in) – Velocity (cm/s or in/s) – Acceleration (cm/s2 or in/s2) – Jerk (rate of change of acceleration – cm/s3 or in/s3) • G – force of gravity (32.2 ft/s2 : 9.81 m/s2) • Power Spectral Density (PSD) – the power at discrete frequencies within a selected bandwidth. • Root mean square acceleration (RMS) – the total energy across the entire frequency range. Whole Body Vibration Whole Body Vibration • Health effects (acute exposure): – Motion sickness • Suspected Health effects (prolonged exposure): – Lumbar spinal disorders – Hemorrhoids – Hernias – Digestive problems – Urinary problems Whole Body Vibration • Performance effects: – Control errors (center mounted joystick errors 50%> side- mounted joystick) – Tracking errors increase up to 40% compared to non-vibration 1
2.
©Professor Alan Hedge,
Cornell University, November 2001 performance (sinusoidal vibration in the range 4-20Hz, with accelerations > 0.2g is worse than random vibration) – Visual performance is disrupted most in the range 10-25Hz WBV Risk varies by Vehicle Type WBV in Vehicles • RMS varies by direction (vertical, lateral) for vehicle type by vehicle design, road quality, air turbulence etc. Vibration varies by Body part and posture WBV depends on Muscle Tension NASA DISC Scale • Scale of passenger discomfort (tested on 2,200 subjects) NASA DISC Scale Equal Motion Sickness Contours Basicentric Axes of the Human Body, ISO 2631 - 1: 1997 ISO 2631-1 Standard (1997) Acceleration (g forces) Acceleration Tolerances Vibrating Hand Tools • Many types of hand tools vibrate. • Vibrations can be: – Intentional – integral to the function of the tool – Incidental – a by product of tool operation • Prolonged use of vibrating tool can cause vascular damage to the upper limbs. Examples: Vibrating Hand Tools Segmental Vibration • The American Conference of Governmental Industrial Hygienists (ACGIH) gives Threshold Limit Values (TLVs) for vibration exposure from hand-held tools. • Exposure limits are given as frequency-weighted acceleration and represented by a single number as a measure of the vibration exposure level. • Acceleration levels and exposure durations which may be exposed repeatedly without severe damage to fingers. 2
3.
©Professor Alan Hedge,
Cornell University, November 2001 • ACGIH guidelines should be applied in conjunction with other vibration protective measures. ACGIH TLVs for exposure of the hand to vibration in X, Y, or Z direction* Hand-Arm Vibration Syndrome (HAVS) • Vibration-induced white finger (VWF) is the most common condition among the operators of hand-held vibrating tools. • Vibration can cause changes in tendons, muscles, bones and joints, and can affect the nervous system. • Collectively, these effects are known as Hand-Arm Vibration Syndrome (HAVS). Hand-Arm Vibration Syndrome (HAVS) • The symptoms of VWF are: – Attacks of whitening (blanching) of one or more fingers when exposed to cold – Tingling and loss of sensation in the fingers – Loss of light touch – Pain and cold sensations between periodic white finger attacks – Loss of grip strength – Bone cysts in fingers and wrists • The symptoms of VWF are aggravated when the hands are exposed to cold. Vibration White Finger (VWF) • Stage 0 – No symptoms – OT - Intermittent tingling – ON - Intermittent numbness – OTN - Tingling and numbness • Stage 1 - Blanching of one or more fingertips with or without tingling and numbness. • Stage 2 - Blanching of one or more fingers with numbness, usually during winter only. Slight interference with home and social activities; no interference with work. Vibration White Finger (VWF) • Stage 3 -Extensive blanching with frequent episodes during both summer and winter. Definite interference with work, home and social activities; restricted hobbies. • Stage 4 - Extensive blanching of most fingers; frequent episodes during summer and winter; finger ulceration, gangrene. Occupation change required to avoid further vibration exposure. VWF Prevalence 3
4.
©Professor Alan Hedge,
Cornell University, November 2001 • 50 percent of 146 tree fellers examined in British Columbia had Raynaud's phenomenon; it affected 75 percent of workers with over 20 years of experience. • 45 percent of 58 rock drillers had attacks of white finger; 25 percent of workers with less than five years of experience, but 80 percent of those with over 16 years experience were affected. VWF Latency Reducing Vibration Injuries • Anti-vibration gloves – absorb vibration energy, can get some impairment of dexterity. • ISO Standard 10819 specifies the amplitude of vibration transmissibility that must be achieved for a glove to be classified as an antivibration glove. • ISO 10819 requires the overall vibration transmissibility of a glove to be measured for mid frequencies (frequency range from 16-400 Hz) and for high frequencies (frequency range from 100-1,600 Hz). Reducing Vibration Injuries • Tool re-design e.g. ‘Antivibe’ hammer: – 500% improved vibration damping over other professional hammers – less vibration through the use of an internal tuning fork Reducing Vibration Injuries • Tool re-design – e.g. ‘Gentle Jack’ jackhammer: – 50% fewer parts than a conventional jackhammer – 50% less noise – 99% less vibration 4
Descargar ahora