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Evidence Guide: MARL020 - Apply advanced principles of marine mechanics

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

MARL020 - Apply advanced principles of marine mechanics

What evidence can you provide to prove your understanding of each of the following citeria?

Apply principle of statics to determine forces in structures, connections, support systems, and trusses in two and three dimensions

  1. Bows notation is applied to solve problems related to trusses
  2. Individual loads are computed using method of sections
  3. Forces in three-dimensional structures are calculated
Bows notation is applied to solve problems related to trusses

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Individual loads are computed using method of sections

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Forces in three-dimensional structures are calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate friction torque in plate and cone clutches

  1. Laws of friction are applied to develop formulae, using uniform wear, to find the torque in a plate and cone clutch
  2. Laws of friction are applied to develop formulae, using uniform pressure, to find the torque in plate and cone clutches
  3. Power to overcome friction in plate and cone clutches using uniform wear and uniform pressure formulae is computed
Laws of friction are applied to develop formulae, using uniform wear, to find the torque in a plate and cone clutch

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Laws of friction are applied to develop formulae, using uniform pressure, to find the torque in plate and cone clutches

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Power to overcome friction in plate and cone clutches using uniform wear and uniform pressure formulae is computed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate displacement, velocity and acceleration in cams, engine mechanisms and gear systems

  1. Velocity and acceleration diagrams are applied to illustrate relative velocity and acceleration
  2. Output of epicyclic gears is calculated by applying relative velocity and acceleration theory
  3. Inertia loads are calculated using piston velocity and acceleration equations
Velocity and acceleration diagrams are applied to illustrate relative velocity and acceleration

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Output of epicyclic gears is calculated by applying relative velocity and acceleration theory

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Inertia loads are calculated using piston velocity and acceleration equations

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Analyse forces and couples to balance reciprocating machinery

  1. How primary force balance is obtained is graphically illustrated
  2. Relationship between complete balance and dynamic balance is explained
  3. Reciprocating piston acceleration formula is applied to differentiate between primary and secondary forces
  4. Complete balance for a multicylinder reciprocating engine or machine is illustrated graphically using vector diagrams and computed analytically
How primary force balance is obtained is graphically illustrated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationship between complete balance and dynamic balance is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Reciprocating piston acceleration formula is applied to differentiate between primary and secondary forces

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Complete balance for a multicylinder reciprocating engine or machine is illustrated graphically using vector diagrams and computed analytically

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply simple harmonic motion principles to solve problems in free and forced vibration

  1. Differences in the terms amplitude, frequency and period are explained
  2. Simple harmonic motion (SHM) equations are derived from the scotch yoke mechanism
  3. Equations for displacement, velocity, acceleration and frequency in SHM are developed
  4. Displacement, velocity, acceleration and frequency in SHM in a vibrating spring-mass system are determined
  5. Spring constant (k) for springs in series and parallel is calculated
  6. Forced vibration caused by an out-of-balance rotating mass is analysed to derive an expression for amplitude of forced vibration
  7. Dangers of resonance are explained
Differences in the terms amplitude, frequency and period are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Simple harmonic motion (SHM) equations are derived from the scotch yoke mechanism

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Equations for displacement, velocity, acceleration and frequency in SHM are developed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Displacement, velocity, acceleration and frequency in SHM in a vibrating spring-mass system are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Spring constant (k) for springs in series and parallel is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Forced vibration caused by an out-of-balance rotating mass is analysed to derive an expression for amplitude of forced vibration

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Dangers of resonance are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate hoop stresses in rotating rings and stresses in compound bars

  1. How rotational stress is generated by centrifugal force is explained
  2. Formula for hoop stress in a rotating ring is applied to calculate hoop stress and/or limiting speed of rotation
  3. Stresses in compound bars subject to axial loads and/or temperature change are determined
How rotational stress is generated by centrifugal force is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Formula for hoop stress in a rotating ring is applied to calculate hoop stress and/or limiting speed of rotation

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Stresses in compound bars subject to axial loads and/or temperature change are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply strain energy and resilience theory to determine stresses caused by impact or suddenly applied loads

  1. Equation is derived to calculate strain energy in a deformed material
  2. Stress in a material due to impact or dynamic loads is determined using energy equation
  3. Equation to calculate stress caused by suddenly applied loads is derived
Equation is derived to calculate strain energy in a deformed material

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Stress in a material due to impact or dynamic loads is determined using energy equation

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Equation to calculate stress caused by suddenly applied loads is derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate beam deflection

  1. Macaulay’s method is applied to calculate beam deflection
  2. Deflection of cantilever and simply supported beams is calculated using standard deflection formulae for different loads
Macaulay’s method is applied to calculate beam deflection

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Deflection of cantilever and simply supported beams is calculated using standard deflection formulae for different loads

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply Euler's formula to find buckling load of a column

  1. Effective length of a column with various end restraints is determined
  2. Slenderness ratio is applied to determine the strength of columns
  3. Relationship between slenderness ratio and buckling is explained
  4. How buckling load for a slender column is applied (including a factor of safety) is explained
Effective length of a column with various end restraints is determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Slenderness ratio is applied to determine the strength of columns

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Relationship between slenderness ratio and buckling is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

How buckling load for a slender column is applied (including a factor of safety) is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate stresses

  1. How to combine stress formula and calculate stress with combined loading is explained
  2. Superposition is used to describe stress due to combined axial and bending stress
  3. Mohr’s Circle is employed to illustrate normal and shear stress
  4. Principal stress formulae are applied to explain how maximum combined normal and shear stress can be obtained
How to combine stress formula and calculate stress with combined loading is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Superposition is used to describe stress due to combined axial and bending stress

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Mohr’s Circle is employed to illustrate normal and shear stress

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Principal stress formulae are applied to explain how maximum combined normal and shear stress can be obtained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply thick shell formulae

  1. Tangential stress distribution caused by internal and external pressure is analysed
  2. Lame’s theorem is applied to describe stress in thick cylinders due to internal and external pressure
Tangential stress distribution caused by internal and external pressure is analysed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Lame’s theorem is applied to describe stress in thick cylinders due to internal and external pressure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply continuity equation to determine changes in fluid velocity

  1. Conservation of energy theory is applied to calculate pressure, head and velocity of fluids flowing through orifices
  2. Volumetric and mass flow through a venturi meter is calculated
  3. Forces exerted by flowing fluids either free (jet) or contained are determined, including coefficients of velocity, contraction of area and discharge
Conservation of energy theory is applied to calculate pressure, head and velocity of fluids flowing through orifices

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Volumetric and mass flow through a venturi meter is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Forces exerted by flowing fluids either free (jet) or contained are determined, including coefficients of velocity, contraction of area and discharge

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine changes in fluid flows through pipe systems and centrifugal pumps

  1. Difference between steady and unsteady flow is clarified
  2. Viscosity of fluids is analysed and difference between dynamic and kinematic viscosity is explained
  3. Significance of Reynolds number in fluid mechanics is explained
  4. Importance of critical Reynolds number is explained
  5. Flow losses in pipes and fittings are calculated
Difference between steady and unsteady flow is clarified

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Viscosity of fluids is analysed and difference between dynamic and kinematic viscosity is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Significance of Reynolds number in fluid mechanics is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Importance of critical Reynolds number is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Flow losses in pipes and fittings are calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Changes of velocity of liquids in a centrifugal pump are analysed and entry and exit vane angles are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Apply principle of statics to determine forces in structures, connections, support systems, and trusses in two and three dimensions

1.1

Bows notation is applied to solve problems related to trusses

1.2

Individual loads are computed using method of sections

1.3

Forces in three-dimensional structures are calculated

2

Calculate friction torque in plate and cone clutches

2.1

Laws of friction are applied to develop formulae, using uniform wear, to find the torque in a plate and cone clutch

2.2

Laws of friction are applied to develop formulae, using uniform pressure, to find the torque in plate and cone clutches

2.3

Power to overcome friction in plate and cone clutches using uniform wear and uniform pressure formulae is computed

3

Calculate displacement, velocity and acceleration in cams, engine mechanisms and gear systems

3.1

Velocity and acceleration diagrams are applied to illustrate relative velocity and acceleration

3.2

Output of epicyclic gears is calculated by applying relative velocity and acceleration theory

3.3

Inertia loads are calculated using piston velocity and acceleration equations

4

Analyse forces and couples to balance reciprocating machinery

4.1

How primary force balance is obtained is graphically illustrated

4.2

Relationship between complete balance and dynamic balance is explained

4.3

Reciprocating piston acceleration formula is applied to differentiate between primary and secondary forces

4.4

Complete balance for a multicylinder reciprocating engine or machine is illustrated graphically using vector diagrams and computed analytically

5

Apply simple harmonic motion principles to solve problems in free and forced vibration

5.1

Differences in the terms amplitude, frequency and period are explained

5.2

Simple harmonic motion (SHM) equations are derived from the scotch yoke mechanism

5.3

Equations for displacement, velocity, acceleration and frequency in SHM are developed

5.4

Displacement, velocity, acceleration and frequency in SHM in a vibrating spring-mass system are determined

5.5

Spring constant (k) for springs in series and parallel is calculated

5.6

Forced vibration caused by an out-of-balance rotating mass is analysed to derive an expression for amplitude of forced vibration

5.7

Dangers of resonance are explained

6

Calculate hoop stresses in rotating rings and stresses in compound bars

6.1

How rotational stress is generated by centrifugal force is explained

6.2

Formula for hoop stress in a rotating ring is applied to calculate hoop stress and/or limiting speed of rotation

6.3

Stresses in compound bars subject to axial loads and/or temperature change are determined

7

Apply strain energy and resilience theory to determine stresses caused by impact or suddenly applied loads

7.1

Equation is derived to calculate strain energy in a deformed material

7.2

Stress in a material due to impact or dynamic loads is determined using energy equation

7.3

Equation to calculate stress caused by suddenly applied loads is derived

8

Calculate beam deflection

8.1

Macaulay’s method is applied to calculate beam deflection

8.2

Deflection of cantilever and simply supported beams is calculated using standard deflection formulae for different loads

9

Apply Euler's formula to find buckling load of a column

9.1

Effective length of a column with various end restraints is determined

9.2

Slenderness ratio is applied to determine the strength of columns

9.3

Relationship between slenderness ratio and buckling is explained

9.4

How buckling load for a slender column is applied (including a factor of safety) is explained

10

Calculate stresses

10.1

How to combine stress formula and calculate stress with combined loading is explained

10.2

Superposition is used to describe stress due to combined axial and bending stress

10.3

Mohr’s Circle is employed to illustrate normal and shear stress

10.4

Principal stress formulae are applied to explain how maximum combined normal and shear stress can be obtained

11

Apply thick shell formulae

11.1

Tangential stress distribution caused by internal and external pressure is analysed

11.2

Lame’s theorem is applied to describe stress in thick cylinders due to internal and external pressure

12

Apply continuity equation to determine changes in fluid velocity

12.1

Conservation of energy theory is applied to calculate pressure, head and velocity of fluids flowing through orifices

12.2

Volumetric and mass flow through a venturi meter is calculated

12.3

Forces exerted by flowing fluids either free (jet) or contained are determined, including coefficients of velocity, contraction of area and discharge

13

Determine changes in fluid flows through pipe systems and centrifugal pumps

13.1

Difference between steady and unsteady flow is clarified

13.2

Viscosity of fluids is analysed and difference between dynamic and kinematic viscosity is explained

13.3

Significance of Reynolds number in fluid mechanics is explained

13.4

Importance of critical Reynolds number is explained

13.5

Flow losses in pipes and fittings are calculated

13.6

Changes of velocity of liquids in a centrifugal pump are analysed and entry and exit vane angles are determined

Required Skills and Knowledge

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Apply principle of statics to determine forces in structures, connections, support systems, and trusses in two and three dimensions

1.1

Bows notation is applied to solve problems related to trusses

1.2

Individual loads are computed using method of sections

1.3

Forces in three-dimensional structures are calculated

2

Calculate friction torque in plate and cone clutches

2.1

Laws of friction are applied to develop formulae, using uniform wear, to find the torque in a plate and cone clutch

2.2

Laws of friction are applied to develop formulae, using uniform pressure, to find the torque in plate and cone clutches

2.3

Power to overcome friction in plate and cone clutches using uniform wear and uniform pressure formulae is computed

3

Calculate displacement, velocity and acceleration in cams, engine mechanisms and gear systems

3.1

Velocity and acceleration diagrams are applied to illustrate relative velocity and acceleration

3.2

Output of epicyclic gears is calculated by applying relative velocity and acceleration theory

3.3

Inertia loads are calculated using piston velocity and acceleration equations

4

Analyse forces and couples to balance reciprocating machinery

4.1

How primary force balance is obtained is graphically illustrated

4.2

Relationship between complete balance and dynamic balance is explained

4.3

Reciprocating piston acceleration formula is applied to differentiate between primary and secondary forces

4.4

Complete balance for a multicylinder reciprocating engine or machine is illustrated graphically using vector diagrams and computed analytically

5

Apply simple harmonic motion principles to solve problems in free and forced vibration

5.1

Differences in the terms amplitude, frequency and period are explained

5.2

Simple harmonic motion (SHM) equations are derived from the scotch yoke mechanism

5.3

Equations for displacement, velocity, acceleration and frequency in SHM are developed

5.4

Displacement, velocity, acceleration and frequency in SHM in a vibrating spring-mass system are determined

5.5

Spring constant (k) for springs in series and parallel is calculated

5.6

Forced vibration caused by an out-of-balance rotating mass is analysed to derive an expression for amplitude of forced vibration

5.7

Dangers of resonance are explained

6

Calculate hoop stresses in rotating rings and stresses in compound bars

6.1

How rotational stress is generated by centrifugal force is explained

6.2

Formula for hoop stress in a rotating ring is applied to calculate hoop stress and/or limiting speed of rotation

6.3

Stresses in compound bars subject to axial loads and/or temperature change are determined

7

Apply strain energy and resilience theory to determine stresses caused by impact or suddenly applied loads

7.1

Equation is derived to calculate strain energy in a deformed material

7.2

Stress in a material due to impact or dynamic loads is determined using energy equation

7.3

Equation to calculate stress caused by suddenly applied loads is derived

8

Calculate beam deflection

8.1

Macaulay’s method is applied to calculate beam deflection

8.2

Deflection of cantilever and simply supported beams is calculated using standard deflection formulae for different loads

9

Apply Euler's formula to find buckling load of a column

9.1

Effective length of a column with various end restraints is determined

9.2

Slenderness ratio is applied to determine the strength of columns

9.3

Relationship between slenderness ratio and buckling is explained

9.4

How buckling load for a slender column is applied (including a factor of safety) is explained

10

Calculate stresses

10.1

How to combine stress formula and calculate stress with combined loading is explained

10.2

Superposition is used to describe stress due to combined axial and bending stress

10.3

Mohr’s Circle is employed to illustrate normal and shear stress

10.4

Principal stress formulae are applied to explain how maximum combined normal and shear stress can be obtained

11

Apply thick shell formulae

11.1

Tangential stress distribution caused by internal and external pressure is analysed

11.2

Lame’s theorem is applied to describe stress in thick cylinders due to internal and external pressure

12

Apply continuity equation to determine changes in fluid velocity

12.1

Conservation of energy theory is applied to calculate pressure, head and velocity of fluids flowing through orifices

12.2

Volumetric and mass flow through a venturi meter is calculated

12.3

Forces exerted by flowing fluids either free (jet) or contained are determined, including coefficients of velocity, contraction of area and discharge

13

Determine changes in fluid flows through pipe systems and centrifugal pumps

13.1

Difference between steady and unsteady flow is clarified

13.2

Viscosity of fluids is analysed and difference between dynamic and kinematic viscosity is explained

13.3

Significance of Reynolds number in fluid mechanics is explained

13.4

Importance of critical Reynolds number is explained

13.5

Flow losses in pipes and fittings are calculated

13.6

Changes of velocity of liquids in a centrifugal pump are analysed and entry and exit vane angles are determined

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying relevant work health and safety/occupational health and safety (WHS/OHS) requirements and work practices

assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices

identifying and applying relevant mathematical formulas and techniques to solve advanced problems related to marine mechanics

identifying and interpreting numerical and graphical information, and performing complex mathematical calculations such as determining hoop stresses in rotating rings and stresses in compound bars

identifying, collating and processing information required to perform complex calculations related to marine mechanics

imparting knowledge and ideas through verbal, written and visual means

reading and interpreting written information needed to perform complex calculations in marine mechanics

solving problems using appropriate laws and principles

using calculators to perform accurate, reliable and complex mathematical calculations.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

advanced principles of marine mechanics

angular and linear motion

Bows notation

centre of gravity

conservation of energy theorem

factor of safety

force

inertia force

joint efficiency factor

laws of friction

laws of motion

momentum

nature and laws of friction

polygon of forces

pressure vessels

reactions

simple harmonic motion

stress and strain

thin cylinder theory

turning moment

vector diagrams

WHS/OHS requirements and work practices.

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.

Dangers include one or more of the following:

catastrophic failure due to physical limitations of machines being exceeded as determined by their susceptibility and resistance to vibrations

violent swaying motions

Different loads include one or more of the following:

combined

concentrated

distributed