MEC4444 - Industrial noise and control - 2017

6 points, SCA Band 2, 0.125 EFTSL

Undergraduate - Unit

Refer to the specific census and withdrawal dates for the semester(s) in which this unit is offered.



Organisational Unit

Department of Mechanical and Aerospace Engineering


Professor Wing Kong Chiu

Unit guides



  • Second semester 2017 (Day)


Fundamentals of sound and sound propagation, wave equation, Helmholtz equation, absorption, impedance and intensity, silencers. Transmission from one medium to another, applications and optimisation. Transmission through walls, mass law, coincidence and resonance. Sound transmission in the atmosphere, inverse square law, excess attenuation. Radiation of sound, directivity. Sound in enclosed spaces. Noise sources, noise reduction techniques, noise legislation and regulation, acceptable noise levels, hearing conservation, measurement and analysis of noise, design for low noise.


On completion of this unit, should are expected to:

  1. Calculate basic noise measurement quantities (sound pressure levels, sound power levels and sound intensity level);
  2. Model the propagation of sound in a duct and in free-space;
  3. Analyse the fundamentals of reactive noise attenuation devices;
  4. Explain the concept of transmission loss:
  5. Explain the concepts of direct and reverberant noise field in a close-environment;
  6. Combine the concepts of noise source, noise path and noise measurement to examine the impact of a given noise source on its environment.


Continuous assessment: 40%

Final Examination (2 hours): 60%

Students are required to achieve at least 45% in the total continuous assessment component and at least 45% in the final examination component and an overall mark of 50% to achieve a pass grade in the unit. Students failing to achieve this requirement will be given a maximum of 45% in the unit.

Workload requirements

2 hours of lectures, 2 hours of laboratory/tutorial classes and 8 hours of private study per week.

See also Unit timetable information

Chief examiner(s)