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

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

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

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.