ch-11 , on bio-mechanics in bio-medical engineering

7/28/2019 Ch-11 , On Bio-mechanics in Bio-medical Engineering

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[BIO-MECHANICS IN BIO-MEDICAL ENGINEERING ,

CH-11 , ANGULAR-

KINEMATICS OF HUMAN

MOVEMENT:]

6/18/2013

BIO-MEDICAL ENGINEERING GUIDE.INC

MUHAMMAD-SIKANDAR-KHAN-LODHI


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[BIO-MECHANICS IN BIO-MEDICAL ENGINEERING , CH-11 ,

ANGULAR-KINEMATICS OF HUMAN MOVEMENT:]

[ W W W . M E D I C A L - I M A G E - P R O C E S S I N G . B L O G S P O T . C A B YS I K A N D A R - K H A N - L O D H I ] Page 2-OF-9

Table of ContentsANGULAR-KINEMATICS OF HUMAN MOVEMENT ........................................................................................ 2

CIRCULAR-MOTION:- ................................................................................................................................. 2

Fig# 11.1 [circular motion ] ................................................................................................................... 3

RELATIVE-ANGLE:- ..................................................................................................................................... 3

Fig 11.2 [ Relative Angle ]: ..................................................................................................................... 4

ABSOLUTE-ANGLE:- ................................................................................................................................... 4

Diagram [ Fig # 11.3 ] [ Absolute-Angle ] ............................................................................................. 5

INSTANCE-CENTER-OF-ROTATION:- .......................................................................................................... 5

Diagram : [ Fig # 11.4 ] [ the knee joint ]:.............................................................................................. 6

ANGULAR-DISTANCE:- ............................................................................................................................... 6

ANGULAR DISPLACEMENT :- ..................................................................................................................... 7

ANGULAR-SPEED [ s= sigma ]:- .................................................................................................................. 8

ANGULAR-VELOCITY :- .............................................................................................................................. 9

ANGULAR-ACCELERATION:- ...................................................................................................................... 9

RIGHT-HAND-RULE:- ............................................................................................................................... 10

ANGULAR-KINEMATICS OF HUMAN MOVEMENT

CIRCULAR-MOTION:-

Now , the circular motion is defined as , its the motion in which a

body which cause to covered the circular path around the fixed

center of the circle and the distance which known as radius will

be remain same [or constant ] between that body which

performed that circular motion and the fixed point which knownas center of the circle .


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Fig# 11.1 [circular motion ]

RELATIVE-ANGLE:-

The relative angle defined as : the angle between the one body

segment which relative to the other body segment , where these

both body segment are articulating at the joint, so this angle isknown as Relative-Angle.

Example:

We consider the relative angle at the knee joint this angle is between

the longitudinal axis of thigh and longitudinal axis of lower leg so,

1.In Extension this relative angle is zero degree .2.In flexion , its value will be change .

Diagram:-


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Fig 11.2 [ Relative Angle ]:

ABSOLUTE-ANGLE:-

The Absolute-Angle are those angle in which we measured angle

orientation of a body segment with respect to a fix reference line .

also this reference line is imaginary and all the absolute angle is

measured in Posteriori [ Posterior ] direction.


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Diagram [ Fig # 11.3 ] [ Absolute-Angle ]

INSTANCE-CENTER-OF-ROTATION:-

In this case , the point known as center of rotation at the joint ,so when the two body segment which are articulated at the

joint .

When these two body segment will be rotated , due to whichthis point will also be keep changing its position within the

joint [ joint act as a center ofrotation ].


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Diagram : [ Fig # 11.4 ] [ the knee joint ]:

ANGULAR-DISTANCE:-

The Angular-Distance is measured as the sum of angularchanges undergoes by the rotating body denoted by [ ( phi

variant ) ] ,

Example:

Consider a person whose taking bicep cure exercise in GYM [

Fitness-connection GYM where I did work out in Toronto from

September 2011 to December 2012 ] , so its initial resting position


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is about 90 degree in flexion phase, then he move his forearm on the

more flexion phase so, the Relative angle of elbow joint change will

be increase from 90 degree to 160 degree .The angular distance covered by this action is

about.> [ ];

Then , if his forearm move down ward in extension position and the

forearm returns to its original position to 90 from 160 then ,

The forearm covered the angular distance is about

.[ ]; so then we say that the totalover all angular distance in one complete cycle of revolution is about

..[ ]; .

In this above way , if this person take 10 complete cycle of

revolution then the result of this 10 complete cycle of revolution is

given below .

The angular-distance in this 10-complete cycle of revolution is about=> [ ].

------------finished-here----------

ANGULAR - DISPLACEMENT :-

The Angular-displacement is the change in angle , when thetwo body segment will be move so,

Its an angle between these two segment will be change thendue to which the angular displacement will be occurs .

Fig # 11.5 : [ ANGULAR-DISPLACEMENT ]:


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---------------------

ANGULAR-SPEED [ s= sigma ]:-

The Angular speed will be measured from the change of per unit of

time.

Mathematically :-

[

];

UNIT:-

[

];


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[ ];

---------------

ANGULAR-VELOCITY :-

The Angular velocity will be define as , the angular displacement

covered by a body per unit time , symbol of angular velocity is .

Mathematically :

[

];

UNIT :-

[

];

------------Finished-here------

ANGULAR-ACCELERATION:-

The Angular-Acceleration will be defined as: change inangular velocity per unit of time.

Symbol of Angular-Acceleration is .Mathematically:

[

];

UNIT:

[

];

-------------finished-here-----------


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RIGHT-HAND-RULE:-

The Right hand rule used to represent the direction ofangular motion vector .

If we bend the fingers of Right hand in the direction of rotationthen the thumb will point out the direction of motion vector .

-----------finished-here------------

-------------CH-11, ON BIO-MECHANICS IN BIO-MEDICAL

ENGINEERING FINISHED-HERE-------------

XMUHAMMAD-SIKANDER-KHAN-LODHI

OWNER-OF-MY-PERSONAL-NOTES Tuesday, June 18, 2013


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