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Elements and Performance Criteria

1. Apply principle of moments to determine forces in supports, connections, bearings and support systems
   • Equilibrium of solids is explained
   • Polygon of forces is applied to determine an unknown force
   • Principle of moments is applied to solve moments of any quantity
   • Resultant of a system of co-planer forces is calculated
   • Twisting moment due to engine crank mechanisms is calculated
   • Moments of areas and solids are calculated
2. Perform friction calculations
   • Laws of friction are applied to solve problems involving friction in inclined planes
   • Coefficient of friction is converted to angle of repose
   • Friction theory is applied to solve problems involving screw threads
   • Brake torque is analysed and problems are solved relating to work lost on brake shoes and brake discs
3. Solve motion problems
   • Linear velocity/time and acceleration/time graphs are applied to derive standard linear formula
   • Problems of linear and angular motion involving uniform acceleration and deceleration are solved
   • Marine engineering problems involving free falling bodies are solved
4. Solve problems using principle of momentum
   • Relationship between momentum and impulse is explained
   • Conservation of energy theory is applied to problems involving collision of perfectly elastic bodies
5. Solve problems using principles of dynamics
   • Centripetal force is distinguished from centrifugal force
   • Relationship between centripetal and centrifugal force and mass, angular velocity and radius is clarified
   • Problems are solved involving centripetal and centrifugal forces
   • Centripetal acceleration is distinguished from centrifugal force
   • Out-of-balance forces on co-planer systems are calculated
   • Bearing reactions in rotating shafts are determined
   • Radius of gyration and moment of inertion when applied to rotating bodies is explained
   • Centrifugal forces in governors are calculated
   • Principles of dynamics are applied to solve problems involving rotating bodies, accelerating shafts, motors and flywheels
6. Calculate stresses and strains on components due to axial loading and restricted thermal expansion
   • Reduction in area and percentage elongation of tensile test specimens is calculated
   • Stresses in composite bodies of dissimilar dimensions and dissimilar materials are calculated
   • Problems involving thermal stress on components due to temperature change with free and restricted expansion are solved
7. Apply thin cylinder theory to determine stresses in pressure vessels
   • Stress on thin-shelled pressure vessels due to internal pressure is calculated
   • Formula for calculating stress on thin-shelled pressure vessels to incorporate special conditions is modified
8. Apply torsion theory to calculate shear stress
   • Torsion equation is applied to solve problems involving solid and hollow shafts
   • Power transmitted in shafts and coupling bolts is calculated
   • Torsion equation is applied to calculate stress and deflection in a close-coiled helical spring
   • Power transmitted by shafts and couplings is calculated
9. Solve problems involving fluids
   • Variation of fluid pressure with depth is calculated
   • Bernoulli’s Theorem is used to solve problems of velocity, pressure and head in pipes and ducted systems
   • Archimedes’ Principle is used to solve problems related to floating vessels using real and apparent weight
10. Apply beam theory to solve problems
    • Reactions of a loaded beam are calculated
    • Shear force and bending moment diagrams are constructed for simply supported and cantilever beams
    • Shear force and bending moment diagrams for beams with concentrated and uniformly distributed loads are calculated
    • Beam equation is applied to derive stresses in beams loaded with concentrated and uniformly distributed loads
    • Beam equation is applied to calculate bending stresses

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.
Governors must include:	porter watt
Special conditions must include:	joint efficiencies safety factors

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Performance Evidence

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 solve problems related to fluids and stresses identifying, collating and processing information required to perform basic calculations related to marine mechanics imparting knowledge and ideas through verbal, written and visual means reading and interpreting written information needed to perform basic calculations in marine mechanics solving problems using appropriate laws and principles using calculators to perform mathematical calculations.

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Knowledge Evidence

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:

basic principles of marine mechanics beam theory conservation of energy theorem factor of safety fluids forces: balanced and unbalanced forces centre of gravity conditions for equilibrium coplanar definitions of matter, mass, weight, force, density and relative density forces moments of couples parallelogram and triangle of forces pressure scalar and vector quantities vector representation of forces joint efficiency factor laws of: friction motion momentum motion: action and reaction force, velocity and acceleration linear and angular motion momentum Newton’s laws of motion pressure vessels principle of moments principles of dynamics relationship between torque and power stress and strain: direct stress and strain Hooke's law load extension graphs modulus of elasticity shear stress and strain thin cylinder theory WHS/OHS requirements and work practices.

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