PROJECT Title

Analysis of Muscles and gripping Analysis of Muscles and gripping Activities Activities

of human Hand During drilling of human Hand During drilling operationoperation

Project group: Mohammed.h.alaqad (101450) Taimur Hassan khan (101448)

Project supervisor Project supervisor

Anayatullah patwariAnayatullah patwari MCE Department

• Vibration is transmitted to body by physical contact with vibrating tools or hand-held power tools such as grinders and rotary tools.

Hand tool has increased the productivity, but also increased the risk of injuries due to higher speed, vibrations, and noise, large operating forces, increased weight of the tool, and unsatisfactory tool design.

1 ) ELECTROMYOGRAPHY :. Electromyography is an objective measurement

technique used in biomechanics research to estimate the muscle fatigue by monitoring changes within muscles before deterioration of mechanical performance can be observed.

2) Vernier Labpro with 3 axis accelerometer : Vibration measured at locations on the tool in closest

contact with the hands by mounting accelerometers directly to the handles .

 

Common Measuring Parameters

3) Hand Dynamometer :Vernier Labpro with hand dynamometer is used to measure static strength of subjects before and after drilling tasks for every duration period.

The significant effect of vibration of hand-drill on muscular activity of the arm and shoulder system.

Vibration transmits from a handle to the arm and shoulder in an upright standing posture and affects the muscles.

Muscular activity is directly inter related with hand drill frequency and time exposure of task.

Three types of muscles , Extensor carpi radials, Biceps brachii and Trapezius pars descendensz are considered specifically because these are the main muscles used when an operator is exposed to vibration.

• Electromyography is used to determine the level of strain created in the muscles by repetitive movement of hand arm shoulder system.

Muscle Activity

Five revolute joints in the arm kinematic model:

1 flexion/extension of shoulder joint.

2 Adduction / abduction of shoulder joint .

3 Internal/external rotation of shoulder joint.

4 flexion/extension of upper arm.5 Supination/pronation of upper arm.

Each revolute joint rotates around its z axis.

S is the flexion angle between shoulder and the body in the sagittal plane and the end e .

• e is the angle between lower arm and upper arm in a flexion posture .

Traditional fixed-hand grips force the user into awkward postures that may cause injury.

The Revolver is built to minimize body stress, so it is easier to get the job done, with less potential for injury.

• Frequency is dependent variable.

• The myoelectric signal consists of a series of action potentials firing at certain frequencies. Frequency analysis decomposes the myoelectric signal into sinusoidal components of different frequencies.

Frequency analysisFrequency analysis

• Strong relationships between muscle activity, interval time and vibration level, Muscle activity increase as the vibration level and exposure duration increase.

• The grip strength reduces the rate of vibration of hand drill .

• The upper and lower arm as the most affected by hand-held vibrating tools compared to other body parts.

CONCLUSIONSCONCLUSIONS

• To use different gripping materials to control hand-drill vibration.

• To perform drilling task so that the exact load on the muscle would be determined.

• Force on the end of the support stand can be calculated so that the load on the waist muscles can be evaluated

Future WorkFuture Work