Quantitative Biomechanical Analysis at University Of Limerick | Flashcards & Summaries

Lernmaterialien für Quantitative Biomechanical Analysis an der University of Limerick

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TESTE DEIN WISSEN

With reference to a sport of choice, outline the application of accelerometry

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TESTE DEIN WISSEN

1) Use of GPS devices to asses distance covered, sprints and accelerations

2)

a) Assessment of physical activity measures (Barry, 1987)

b) Injury/pain causes (Voloshin & Wosk, 1982)

c) Assessment of running gait

d) Protective equipment (Bishop et al. 1984; Bishop & Biard 1984)

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TESTE DEIN WISSEN

Define Young' Modulus using stress-strain diagrams

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TESTE DEIN WISSEN

Young's Modulus (E): The slope of a line on a stress-strain diagram is a measure of the stiffness of a material

Add in a stress-strain diagram showing a change in strain divided by change in stress

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TESTE DEIN WISSEN

Define the variables of this equation

x = 4FL^3/3π Er^4

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TESTE DEIN WISSEN

It is the equation used to calculate the vertical deviation in a cantilever with a circular cross section/calculate the bending of a bone

X = vertical distance

F = force applied

E = Material stiffness / Young's Modulus

r = radius of cantilever

L = length of cantilever

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TESTE DEIN WISSEN

Breifly discuss the five differnet sections outlined on the stress-strain diagram obtained for a section of a human ligament

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TESTE DEIN WISSEN

1 = toe region -

2 = linear / elastic region

3 = progressive failure / plastic region - where further stress will cause permanent deformation

4 = major failure - where the maximum stress or strain can be withstood before failure

5 = complete failure - rupture


1 = normal ligament

2-3 = thinning ligment

4 = overstretched  - grade 2

5 = rupture

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TESTE DEIN WISSEN

Define variables in the following equation

 = (2t(l - x)/r)

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TESTE DEIN WISSEN

o(x) = stress induced in fibre

t = interfacical stress

r = radius

l = half the length of the fibre

x = distance

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TESTE DEIN WISSEN

Define Poisson’s Ratio

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TESTE DEIN WISSEN

Materials will typically deform in more than one axis when a load is applied

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TESTE DEIN WISSEN

State the 4 functions of bone, tendon and ligament

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TESTE DEIN WISSEN

1) support

2) facilitation of movement

3) protection of internal organs

4) storage of minerals and fat 

5) hematopoiesis


Ligmanets conncet bone to bone

Tendons connect muscles to bone

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TESTE DEIN WISSEN
Calculate unknown forces
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TESTE DEIN WISSEN
Efx = m.ax
Efx = distal + proximal = m.ax

Efy =m.ay
Efy = distal + proximal + m.g = m.ay
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TESTE DEIN WISSEN
Newton's 1st law
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TESTE DEIN WISSEN
The law of inertia
States that a body will remain in it's current state of motion unless acted upon by an external force
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TESTE DEIN WISSEN
Newton's 2nd law
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TESTE DEIN WISSEN
Law of acceleration
States that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object 
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TESTE DEIN WISSEN
Newton's 3rd law
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TESTE DEIN WISSEN

Law of reaction

States that when one body applied a force to another body, the second body applied an equal and opposite reaction force on the first body

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TESTE DEIN WISSEN
Strain gauges 
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TESTE DEIN WISSEN
1) No. Of strain sensitive wires
2) attached to cantilever - fixed base
3) wires - wheatstone bridge circuit
4) bone is (v) = ME to deform due to own inertia
5) deformation = change in wires = change in resistance + balance to bridge circuit
6) Results = output proportional  to (v) of base
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Q:

With reference to a sport of choice, outline the application of accelerometry

A:

1) Use of GPS devices to asses distance covered, sprints and accelerations

2)

a) Assessment of physical activity measures (Barry, 1987)

b) Injury/pain causes (Voloshin & Wosk, 1982)

c) Assessment of running gait

d) Protective equipment (Bishop et al. 1984; Bishop & Biard 1984)

Q:

Define Young' Modulus using stress-strain diagrams

A:

Young's Modulus (E): The slope of a line on a stress-strain diagram is a measure of the stiffness of a material

Add in a stress-strain diagram showing a change in strain divided by change in stress

Q:

Define the variables of this equation

x = 4FL^3/3π Er^4

A:

It is the equation used to calculate the vertical deviation in a cantilever with a circular cross section/calculate the bending of a bone

X = vertical distance

F = force applied

E = Material stiffness / Young's Modulus

r = radius of cantilever

L = length of cantilever

Q:

Breifly discuss the five differnet sections outlined on the stress-strain diagram obtained for a section of a human ligament

A:

1 = toe region -

2 = linear / elastic region

3 = progressive failure / plastic region - where further stress will cause permanent deformation

4 = major failure - where the maximum stress or strain can be withstood before failure

5 = complete failure - rupture


1 = normal ligament

2-3 = thinning ligment

4 = overstretched  - grade 2

5 = rupture

Q:

Define variables in the following equation

 = (2t(l - x)/r)

A:

o(x) = stress induced in fibre

t = interfacical stress

r = radius

l = half the length of the fibre

x = distance

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Q:

Define Poisson’s Ratio

A:

Materials will typically deform in more than one axis when a load is applied

Q:

State the 4 functions of bone, tendon and ligament

A:

1) support

2) facilitation of movement

3) protection of internal organs

4) storage of minerals and fat 

5) hematopoiesis


Ligmanets conncet bone to bone

Tendons connect muscles to bone

Q:
Calculate unknown forces
A:
Efx = m.ax
Efx = distal + proximal = m.ax

Efy =m.ay
Efy = distal + proximal + m.g = m.ay
Q:
Newton's 1st law
A:
The law of inertia
States that a body will remain in it's current state of motion unless acted upon by an external force
Q:
Newton's 2nd law
A:
Law of acceleration
States that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object 
Q:
Newton's 3rd law
A:

Law of reaction

States that when one body applied a force to another body, the second body applied an equal and opposite reaction force on the first body

Q:
Strain gauges 
A:
1) No. Of strain sensitive wires
2) attached to cantilever - fixed base
3) wires - wheatstone bridge circuit
4) bone is (v) = ME to deform due to own inertia
5) deformation = change in wires = change in resistance + balance to bridge circuit
6) Results = output proportional  to (v) of base
Quantitative Biomechanical Analysis

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