DE6302 – Mechanics of Machines

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Module code
DE6302
Module title
Mechanics of Machines
Prescription
To develop understanding to solve complex problems involved with machinery dynamics such as power transmission, balancing, noise, and lubrication systems.
Programmes
  • EN1603
  • SC1101
NZQA Level
Level 6
NZQA Credits
15
Delivery method
  • Web-Enhanced
Learning hours
Directed hours
90
Self directed hours
60
Total learning hours
150
Resources required
Learning Outcomes
1.Identify dynamic loads in rotational equipment and explain the need for balance and how it is achieved.
2.Analyse mechanical systems to determine natural frequencies and the effects of resonance.
3.Explain acoustic term and solve for noise level and noise attenuation in an engineering environment.
4.Explain gear terminology. Solve velocity ratios and forces in gear systems.
5.Analyse power transmission components for life, force and application.
Content
Determine Static and dynamic balance and out of balance forces,
Balancing machines, balancing reciprocating machines (descriptive)
Vibration isolation.
Free and forced vibration, self excitation, natural frequency, resonance, periodic motion, simple harmonic motion,
Transverse vibration, whirling of shafts, Dynamic deflection and stress of shafts
Torsional vibration (limit two inertia on shaft of two different section)
Noise measurement, and terms,
Noise control and transmission.
Inverse square law, sound fields, noise addition
Gear types, terms and definitions, pressure angle, gear tooth force, shaft loads, torque, power,
Epicyclic gears, gear ratios.
Clutches (types and calculations),
Brakes, short block, self-energizing band,
Chain and belt drives, Tensions, shaft loads, selection for catalogs
Bearings; Plane (dry), Rolling element (L10 calculations and selection from catalogs), and bearing lubrication.
Flywheels, turning moment diagram, referred inertia through gear ratio
Machines, MA, VR, efficiency, Limiting Efficiency, Machine law.
Assessment Criteria
Tests 20
Assignments, Laboratory (Practical) 30
Examination 50