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Evidence Guide: MARL012 - Apply basic 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

 

MARL012 - Apply basic principles of marine mechanics

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

Use vector diagrams to calculate the resultant and equilibrant of up to four coplanar forces

  1. Meaning of force as a vector, moment of a force, resultant and equilibrant are explained
  2. Forces using the triangle and polygon of forces are determined
  3. Moments and couples applied to beams and levers are explained
  4. Centroid of an area is calculated
  5. Centre of gravity of regular geometrical shapes is calculated
  6. Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated
Meaning of force as a vector, moment of a force, resultant and equilibrant are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Forces using the triangle and polygon of forces are determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Moments and couples applied to beams and levers are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Centroid of an area is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Centre of gravity of regular geometrical shapes is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Solve problems involving friction

  1. Nature of friction and the laws of dry sliding friction are explained
  2. Influence of lubrication on bearings and plain surfaces is outlined
  3. Coefficient of friction is derived
  4. Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces
  5. Effect of lubricating two surfaces in contact with each other is outlined
Nature of friction and the laws of dry sliding friction are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Influence of lubrication on bearings and plain surfaces is outlined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Coefficient of friction is derived

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Effect of lubricating two surfaces in contact with each other is outlined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply laws of motion

  1. Laws of motion are explained
  2. Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion
  3. Formula and/or graphs are applied to solve problems of linear and angular velocity
  4. Linear motion is converted to angular motion and revolutions to radians
Laws of motion are explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Formula and/or graphs are applied to solve problems of linear and angular velocity

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Linear motion is converted to angular motion and revolutions to radians

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Solve problems in dynamics related to marine machinery

  1. Relationship between torque, work, energy and power in marine engines and compressors is explained
  2. Conservation of energy theorem is used to calculate energy and power during linear and angular motion
  3. Meaning of momentum is explained
  4. Calculations are performed associated with the collision of rigid bodies
  5. Centrifugal force is distinguished from centripetal force
  6. Centrifugal and centripetal force in relation to marine machinery is calculated
Relationship between torque, work, energy and power in marine engines and compressors is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Conservation of energy theorem is used to calculate energy and power during linear and angular motion

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Meaning of momentum is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations are performed associated with the collision of rigid bodies

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Centrifugal force is distinguished from centripetal force

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Centrifugal and centripetal force in relation to marine machinery is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine efficiency of lifting and geared marine machinery

  1. Velocity ratio, mechanical advantage and efficiency of simple machines is calculated
  2. Calculations are performed to solve problems related to the operation of simple machines
Velocity ratio, mechanical advantage and efficiency of simple machines is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculations are performed to solve problems related to the operation of simple machines

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate stress and strain due to axial loads

  1. Normal stress is distinguished from strain
  2. Hooke's Law for stress and strain is explained
  3. Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained
  4. Normal stress and strain caused by axial loads is calculated
Normal stress is distinguished from strain

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Hooke's Law for stress and strain is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Normal stress and strain caused by axial loads is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine shear stress and strain in coupling bolts and simple bolted connections

  1. Shear stress in simple bolted connections is determined
  2. Torque theory is applied to calculate shear stress in coupling bolts
Shear stress in simple bolted connections is determined

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Torque theory is applied to calculate shear stress in coupling bolts

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine stresses in thin walled pressure vessels

  1. Factor of safety and joint efficiency factor for pressure vessels is calculated
  2. Hoop and longitudinal stress in thin walled pressure vessels is calculated
Factor of safety and joint efficiency factor for pressure vessels is calculated

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Hoop and longitudinal stress in thin walled pressure vessels is calculated

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

Use vector diagrams to calculate the resultant and equilibrant of up to four coplanar forces

1.1

Meaning of force as a vector, moment of a force, resultant and equilibrant are explained

1.2

Forces using the triangle and polygon of forces are determined

1.3

Moments and couples applied to beams and levers are explained

1.4

Centroid of an area is calculated

1.5

Centre of gravity of regular geometrical shapes is calculated

1.6

Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated

2

Solve problems involving friction

2.1

Nature of friction and the laws of dry sliding friction are explained

2.2

Influence of lubrication on bearings and plain surfaces is outlined

2.3

Coefficient of friction is derived

2.4

Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces

2.5

Effect of lubricating two surfaces in contact with each other is outlined

3

Apply laws of motion

3.1

Laws of motion are explained

3.2

Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion

3.3

Formula and/or graphs are applied to solve problems of linear and angular velocity

3.4

Linear motion is converted to angular motion and revolutions to radians

4

Solve problems in dynamics related to marine machinery

4.1

Relationship between torque, work, energy and power in marine engines and compressors is explained

4.2

Conservation of energy theorem is used to calculate energy and power during linear and angular motion

4.3

Meaning of momentum is explained

4.4

Calculations are performed associated with the collision of rigid bodies

4.5

Centrifugal force is distinguished from centripetal force

4.6

Centrifugal and centripetal force in relation to marine machinery is calculated

5

Determine efficiency of lifting and geared marine machinery

5.1

Velocity ratio, mechanical advantage and efficiency of simple machines is calculated

5.2

Calculations are performed to solve problems related to the operation of simple machines

6

Calculate stress and strain due to axial loads

6.1

Normal stress is distinguished from strain

6.2

Hooke's Law for stress and strain is explained

6.3

Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained

6.4

Normal stress and strain caused by axial loads is calculated

7

Determine shear stress and strain in coupling bolts and simple bolted connections

7.1

Shear stress in simple bolted connections is determined

7.2

Torque theory is applied to calculate shear stress in coupling bolts

8

Determine stresses in thin walled pressure vessels

8.1

Factor of safety and joint efficiency factor for pressure vessels is calculated

8.2

Hoop and longitudinal stress in thin walled pressure vessels is calculated

Required Skills and Knowledge

Elements describe the essential outcomes.

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

1

Use vector diagrams to calculate the resultant and equilibrant of up to four coplanar forces

1.1

Meaning of force as a vector, moment of a force, resultant and equilibrant are explained

1.2

Forces using the triangle and polygon of forces are determined

1.3

Moments and couples applied to beams and levers are explained

1.4

Centroid of an area is calculated

1.5

Centre of gravity of regular geometrical shapes is calculated

1.6

Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated

2

Solve problems involving friction

2.1

Nature of friction and the laws of dry sliding friction are explained

2.2

Influence of lubrication on bearings and plain surfaces is outlined

2.3

Coefficient of friction is derived

2.4

Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces

2.5

Effect of lubricating two surfaces in contact with each other is outlined

3

Apply laws of motion

3.1

Laws of motion are explained

3.2

Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion

3.3

Formula and/or graphs are applied to solve problems of linear and angular velocity

3.4

Linear motion is converted to angular motion and revolutions to radians

4

Solve problems in dynamics related to marine machinery

4.1

Relationship between torque, work, energy and power in marine engines and compressors is explained

4.2

Conservation of energy theorem is used to calculate energy and power during linear and angular motion

4.3

Meaning of momentum is explained

4.4

Calculations are performed associated with the collision of rigid bodies

4.5

Centrifugal force is distinguished from centripetal force

4.6

Centrifugal and centripetal force in relation to marine machinery is calculated

5

Determine efficiency of lifting and geared marine machinery

5.1

Velocity ratio, mechanical advantage and efficiency of simple machines is calculated

5.2

Calculations are performed to solve problems related to the operation of simple machines

6

Calculate stress and strain due to axial loads

6.1

Normal stress is distinguished from strain

6.2

Hooke's Law for stress and strain is explained

6.3

Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained

6.4

Normal stress and strain caused by axial loads is calculated

7

Determine shear stress and strain in coupling bolts and simple bolted connections

7.1

Shear stress in simple bolted connections is determined

7.2

Torque theory is applied to calculate shear stress in coupling bolts

8

Determine stresses in thin walled pressure vessels

8.1

Factor of safety and joint efficiency factor for pressure vessels is calculated

8.2

Hoop and longitudinal stress in thin walled pressure vessels is calculated

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 basic problems related to marine mechanics

identifying and interpreting numerical and graphical information, and performing mathematical calculations to determine resultant and equilibrant of coplanar forces, linear and angular velocity, and hoop and longitudinal stress in thin walled pressure vessels

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

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

solving problems using appropriate laws and principles

performing accurate and reliable mathematical calculations using a calculator.

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:

centre of gravity

conservation of energy theorem

effective verbal, written and visual communication strategies

factor of safety

force

joint efficiency factor

laws of motion

momentum

nature and laws of friction

pressure vessels

principles of marine mechanics

stress and strain

thin cylinder theory

types and uses of simple machines

WHS)/(OHS requirements and work practices.

Range Statement

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

Simple machines include one or more of the following:

hydraulic jack

pulley blocks

reduction gears

screw jack

single and double purchase crab winches

warwick screw

wheel and axle

worm driven chain blocks